TI GC5018 8-channel wideband receiver Datasheet

GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
1
Introduction
1.1
•
•
•
•
•
FEATURES
Four 16-Bit CMOS ADC Input Ports
Programmable Closed Loop VGA Control With
6-Bit Outputs for Each ADC Input Port
Provide Received Total Wide Band Power
(RTWP) Measurement for the Composite
Power Across Carriers With Programmable
Time Window for Measurement
8 UMTS Digital Down Converter (DDC)
Channels or 16 CDMA or 16 TD-SCDMA DDC
Channels With Programmable 18 Bit Filter
Coefficients
Each DDC channel includes
– Real or Complex DDC Inputs
– 115 dB SFDR NCO
– UMTS Mode Rx Filtering: 6 Stage CIC (m=1
or 2), Up to 40 Tap CFIR, Up to 64 Tap PFIR
– CDMA Mode Rx Filtering: 6 Stage CIC (m=1
or 2), Up to 64 Tap CFIR, Up to 64 Tap PFIR
– Power Measurements
– Final AGC
•
•
•
1.5V Digital Core Supply, 3.3V Digital I/O
Supply
305 Ball Plastic BGA (19 mm x 19 mm) With
1.0 mm Pitch
Power Dissipation: 2.5W
1.2
•
•
•
•
•
•
•
•
•
•
APPLICATIONS
Wireless Base Station Receiver
Multi-Carrier Digital Receiver
UMTS (4 Carriers-1 Sector With Diversity)
CDMA (8 Carriers-1 Sector With Diversity)
TD-SCDMA (16 Carriers-1 Sector Without
Diversity, 8 Carriers-1-Sector With Diversity)
Digital Radio Receivers
Wide Band Receivers
Software Radios
Wireless Local Loop
Intelligent Antenna Systems
Contents
1
2
3
4
5
Introduction ............................................... 1
1.1
FEATURES ........................................... 1
1.2
APPLICATIONS ...................................... 1
5.2
General Description ..................................... 2
RECEIVE DIGITAL SIGNAL PROCESSING ......... 2
3.1
Receive Input Interface ............................... 3
3.2
DDC Organization ................................... 15
6
GC5018 GENERAL CONTROL ....................... 44
4.1
Microprocessor Interface Control Data, Address,
and Strobes ......................................... 44
4.2
Synchronization Signals ............................. 46
4.3
Interrupt Handling ................................... 48
4.4
GC5018 Programming
..............................
48
GC5018 PINS........................................... 122
5.1
7
Microprocessor Signals ............................ 126
......................................
5.4
Factory Test and No Connect Signals .............
5.5
Power and Ground Signals ........................
5.6
Digital Supply Monitoring ..........................
5.7
JTAG ...............................................
SPECIFICATIONS .....................................
6.1
ABSOLUTE MAXIMUM RATINGS.................
6.2
RECOMMENDED OPERATING CONDITIONS ...
6.3
THERMAL CHARACTERISTICS ..................
6.4
DC CHARACTERISTICS ..........................
6.5
AC TIMING CHARACATERISTICS ................
Revision History ......................................
5.3
JTAG Signals
127
127
127
128
128
128
128
129
129
129
130
131
Digital Receive Section Signals .................... 122
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this document.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005–2005, Texas Instruments Incorporated
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
2
General Description
The GC5018 is a multi-channel communications signal processor that provides digital downconversion
optimized for cellular base transceiver systems. The device supports UMTS, CDMA-1X and TD-SCDMA
air interface cellular standards.
The chip provides up to 8 UMTS digital downconverter channels (DDC), 16 CDMA DDCs or 16
TD-SCDMA DDCs. The DDC channels are independent and operate simultaneously.
The GC5018 has four 16-bit inputs. Each DDC channel can be programmed to accept data from any one
(or two for complex input mode) of the four input ports.
dvga_b
dvga_d
dvga_a
dvga_c
I
DDC0
6
16
6
6
rxin_a
adcclk_a
16
Digital receive
data ports
6
2 CDMA2000−1X,
2 TD−SCDMA or 1 UMTS
I
DDC1
rxin_b
adcclk_b
2 CDMA2000−1X,
2 TD−SCDMA or 1 UMTS
rxin_c
adcclk_c
DDC2
rxin_d
adcclk_d
2 CDMA2000−1X,
2 TD−SCDMA or 1 UMTS
Receive Input
Interface
Power
Measurements
and
Wideband
ACG
tdo
Q
sync
I
DDC3
JTAG
Q
sync
I
16
16
trst_n
tck
tdi
tms
Q
sync
2 CDMA2000−1X,
2 TD−SCDMA or 1 UMTS
Q
sync
I
DDC4
2 CDMA2000−1X,
2 TD−SCDMA or 1 UMTS
Q
32
Output
Format
Parallel
or Serial
rxout_X_X
8
sync
rx_sync_out_X
rxclk_out
I
DDC5
4
rx_sync a−d
interrupt
reset_n
Control and Sync
rx_sync_out
2 CDMA2000−1X,
2 TD−SCDMA or 1 UMTS
Q
sync
I
DDC6
2 CDMA2000−1X,
2 TD−SCDMA or 1 UMTS
16
6
d(15:0)
a(5:0) rd_n wr_n ce_n
Q
sync
I
DDC7
rxclk
2 CDMA2000−1X,
2 TD−SCDMA or 1 UMTS
Q
sync
Figure 2-1. Functional Block Diagram
3
RECEIVE DIGITAL SIGNAL PROCESSING
The down conversion section of the GC5018 consists of the receive input interface, the rx_distribution
bus, and 8 digital downconverter blocks.
The purpose of the receive input interface is to accept signal data from four 16 bit input ports, measure the
input signal power, control the digital VGA and to distribute the data to the DDC blocks. The input
interface also has a user-controlled test generator and noise source.
The rx_distribution bus distributes the four channels of signal data to each of the 8 DDC blocks.
2
General Description
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Each DDC block selects one of the four channels (or 2 for complex input data) from the rx_distribution bus
and then performs downconversion tuning, programmable delay, channel filtering with decimation, power
measurement, fixed gain adjust and/or automatic gain control. Each DDC block can support 1 UMTS
channel, 2 CDMA channels or 2 TD-SCDMA channels. An optional mode permits stacking two DDC
blocks in UMTS mode to provide double-length final pulse shaping filtering.
Tuned, filtered, and decimated signal data is output in bit serial or parallel format.
3.1
Receive Input Interface
dvga_a
6
18
rxin _a
16
test & noise
signal
generator
16
FIFO
16
dual real or
single complex
Power Meter
to testbus
dual real or
single complex
AGC
1 to 64
sample
delay
line
delay_a
rxin _b
16
FIFO
16
dvga_b
6
1 to 64
sample
delay
line
dvga_c
6
delay_b
16
test & noise
signal
generator
18
rx_distribution
bus to DDC
channels
18
rxin _c
16
test & noise
signal
generator
16
test bus select
and decimation
FIFO
16
dual real or
single complex
Power Meter
testbus
sources
dual real or
single complex
AGC
1 to 64
sample
delay
line
delay_c
rxin _d
16
dvga_d
test & noise
signal
generator
16
FIFO
16
18
1 to 64
sample
delay
line
6
delay_d
Figure 3-1. Receive Data Input Interface
The GC5018’s receive input data interface accepts data from two sources:
• Signal data presented at the four 16-bit digital data input ports.
• A LFSR test signal generator allows the GC5018 to be tested using a known repetitive data sequence.
Signal data can be provided in binary or 2’s complement form. The location of the ADC’s MSB can be
programmed to allow for additional AGC headroom if desired. For example, a 14-bit ADC may be
connected with the MSBs aligned, or shifted down to allow the AGC additional gain range before clipping
the signal.
Signal data can be accepted at rates up to rxclk in UMTS mode for either 8 normal channels or 4 double
length final pulse shaping filter channels. In CDMA mode the maximum input rate is rxclk for real inputs, or
rxclk/2 for complex inputs. For maximum filter performance, higher clock rates generally allow longer
filters.
Complex signal data is input with I data driving one input port and Q data driving another. This means that
there are only two signal data ports available when using complex input mode. The mapping of I and Q
data onto the four input ports is programmable.
RECEIVE DIGITAL SIGNAL PROCESSING
3
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Signal input data is clocked into 8-stage FIFOs using a matching external clock signal adcclk_a/b/c/d.
Signal data is clocked out of the FIFO from a gated rxclk (the GC5018 receive section clock). The FIFO
allows arbitrary phase relationship between adcclk_a/b/c/d and rxclk. The frequency relationship is
mandated by the programmed configuration.
The test and noise generator can supply test sequences or add noise to the input signal data. The test
sequences, when combined with the checksum generators, are useful for initial board debug or power-on
self-test.
For applications that require receiver desensitization, the noise generator can add noise to input data
streams.
Many internal chip signals can be routed to the testbus for evaluation and debug purposes. When the
testbus is enabled, the rxin_c and rxin_d ports are driven as digital outputs.
Each of the four outputs to the DDC channels includes a 1 to 64 sample delay line.
PROGRAMMING
VARIABLE
DESCRIPTION
ssel_ddc(2:0)
Selects the sync source for the DDC data input mux and mixer. This sets the sync source for DDC input clock
generation and synchronization for all DDC channels.
offset_bin_X
Selects offset binary input when set, 2’s complement input when cleared. X={a,b,c,d}
msb_pos_X(2:0)
Identifies the connection location of the ADC’s MSB. Programmed values of {0..7} corresponds to msb at {rxin_x_15..
rxin_x_8}. X={a,b,c,d}
3.1.1
Receive FIFO
The receive FIFO consists of an 8 stage memory and 2 counters generating the input write pointer and
output read pointer. When the FIFO receives a sync signal, the input and output pointers are initialized
with a write to read pointer offset of four samples. Input samples from rxin_X (writes) are clocked with the
adcclk_X input clock rising edges, and the input pointer advances on each clock rising edge. Output
samples (reads) and the output pointer are clocked with the rxclk input signal rising edges, divided by the
programmed sample rate loaded into the rate_sel(1:0) control register.
PROGRAMMING
VARIABLE
DESCRIPTION
adc_fifo_bypass
When set, bypasses the input FIFOs and input data is latched directly using the rxclk. When cleared, input data is
latched using the adcclk_a/b/c/d inputs.
ssel_adc_fifo(2:0)
Selects the sync source for the FIFO state machines. This sync signal initializes the FIFO input and output
pointers.
rate_sel(1:0)
This selects the FIFO input and output rate; {rxclk, rxclk/2, rxclk/4 or rxclk/8 }. For example, with rxclk at
153.6MHz, set rate_sel to 0, 1, 2 or 3 respectively for adcclk_a/b/c/d 153.6, 76.8, 38.4 or 19.2MHz.
adc_fifo_strap_ab
When set, the rxin_a and rxin_b FIFO input and output pointers are synchronized to support complex input
signals.
adc_fifo_strap_cd
When set, the rxin_c and rxin_d FIFO input and output pointers are synchronized to support complex input
signals.
4
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
3.1.2
Receive Input Power Meters
from rxin_a FIFO output
pmeter_iq0
from rxin_b FIFO output
pmeter_iq1
from rxin_c FIFO output
pmeter_iq2
from rxin_d FIFO output
pmeter_iq3
I
power meter 0
power meter 0 results
power meter 1
power meter 1 results
power meter 2
power meter 2 results
power meter 3
power meter 3 results
Q
I
Q
I
Q
I
Q
Figure 3-2. Receive Input Power Meters
Four Receive Input RMS power meters are provided. For real inputs, the four power meters can be used
to measure the RMS power of the combined carriers in each of the four input signals (the Q input is held
at zero). For complex inputs, two power meters can be use to measure the combined complex power and
two can be disabled.
RECEIVE DIGITAL SIGNAL PROCESSING
5
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
32
16
I
33
58−bit
Integrator
58−bit
Register
32
16
Q
transfer
clear
9−bit
sync delay
counter
sync
RMS power
21−bit
21−bit
interval
counter
integration
counter
9
21
21
delay
(in 8 sample
interval
(in 8 sample
integration
(in 8 sample
increments)
increments)
increments)
Figure 3-3. Detailed Functionality of Receive Input Power Meter
sync
delay
integration time
integration time
integration time
interval time
sync
event
integration
start
integration
start
integration
start
Figure 3-4. Receive Input Power Meter Timing
Power is calculated by squaring each 16 bit I (I and Q for complex inputs) sample, summing, and then
integrating the summed-squared results into a 58 bit accumulator over a programmable integration period.
The integration period is programmed into the 21 bit counter, in 8 sample increments. The power read is:
power = [ (I2) x (Nx8 + 1) ] for real inputs where N is the integration count.
power = [ (I2 + Q2)x (Nx8 + 1) ] for complex inputs where N is the integration count.
A programmable 21 bit interval counter sets the power measurement interval (how often power will be
measured) in 8 sample increments. A measurement integration period is started at the beginning of each
interval period.
The process begins with a sync event starting the 9 bit delay counter. After (8xsync_delay + 2) samples,
the integration interval is started. Integration continues until the integration count is met, at which point the
58 bit integrator results are transferred to the read only register and an interrupt is generated. A new
measurement period will start at the end of the interval period.
NOTE
Each of the four composite RMS power meter blocks has its own delay sync, interval, and
integration period counters, as well as separate sync source registers.
The 21-bit counters in 8 sample increments allow up to 104.8mS interval times at 160MHz clock.
6
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
PROGRAMMING
VARIABLE
DESCRIPTION
recv_pmeterX (57:0)
58 bit power measurement result. X= {0,1,2,3}.
recv_pmeterX_sqr_sum(20:0)
21 bit integration (square and sum) period. X= {0,1,2,3}.
recv_pmeterX_sync_delay(8:0)
Power meter delay sync period. X= {0,1,2,3}.
recv_pmeterX_strt_intrvl(20:0)
21 bit measurement interval. X= {0,1,2,3}. The strt_intrvl value must be greater than the sqr_sum value.
ssel_recv_pmeter_X(2:0)
Sync source. X= {0,1,2,3}.
pmeterX_iq
Selects complex power measurement input mode when set. X= {0,1,2,3}.
recv_pmeterX_ena
Enables power meter when set. X= {0,1,2,3}.
3.1.3
Receive Input AGC (RAGC)
Input signals from the ADCs can be used to create a front end composite AGC loop when combined with
a digitally controlled variable gain amplifier (DVGA) connected before the ADCs. The AGC system
operates by integrating the square of the ADC samples over a programmable interval and applying a table
driven error signal to a loop integrator based on the squared integration output. The error table maps the
signal power to a user programmed error value. The loop integrator output is used to drive map tables to
control the DVGA output pins and a gain adjustment multiplier. Fast updates can be enabled if desired, to
cause the loop integrator to quickly adjust to interfering signals. The ADC input signals can also be passed
through a high pass filter to remove DC offset before squaring the input.
The programmable error table, integrator mapping tables, and clip thresholds, when combined with the
user programmable interval timers provide a highly flexible AGC function.
integrate and dump signal power measurement
enable corner
Samples 16
from
ADC FIFO
Filter
Highpass
Filter
55
acc_shift
5
31
X2
7
7
limit
{127..0}
+
0
1
shift
limit
&
limit
acc_offset
−
6
{127..0}
128w x 8b ram
Map 8
Error
Table
Map
Table
update
err_shift 5
sd_thresh
signal detect
mode controls
Signal
Level
Detect
error
shift
loop accumulator
no_signal
freeze control register bit
freeze from sync source
clear control register bit
clear sync source
16
64w x 22b RAM
Map
6 MSBs DVGA
Table 6
Map
Table
Gain
Map
Gain
Table 16
Map
Table
to DVGA
pins
32
Clip
Detect
Mag
clip_error
16
delay adjust
16
5
Delay
to DDC
channels
clip_hi_thresh
16
clip_low_thresh
clip detect controls
sync
update
sync
delay
update interval
Figure 3-5. Receive Input AGC
RECEIVE DIGITAL SIGNAL PROCESSING
7
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
The AGC measurement interval timer is a 24-bit timer initialized by a sync after a programmable 8-bit
delay. During the integration interval, the squared input signal is shifted by the programmed value and
accumulated. At the end of the interval time, an update pulse is generated, and the selected 7 bits of the
55-bit accumulated power is upper limit checked and transferred to the power holding register. A
programmable offset is applied, and the following limit check produces a 7 bit address value for the error
map table RAM. The user programmable error map table and following gain shift setting are used to
determine the loop error signal to be added to the 32-bit AGC loop accumulator. The error value is only
added to the loop accumulator once per update. The loop accumulator upper 6 MSBs are used as the
address for the programmable DVGA map table and gain map table. The gain map table address can be
delayed from 0 to 31 clock cycles to align DVGA changes to signal level changes at the output of the
AGC.
The AGC includes four sources for freezing the loop and holding the loop accumulator constant. A general
sync source can be used to directly control the freeze; when the selected sync source is high, the AGC
will be held, and when low, the AGC will operate. A control register bit freezes the AGC in the same
fashion; when the bit is set, the AGC is held, and when cleared, the AGC will operate. A signal level
detector is provided that can be used to automatically freeze the AGC loop in the event of input signal
loss. A programmable signal detection threshold value, number of samples below the signal detection
threshold, and window timer are used to determine when no signal is present. Finally, a programmable
number of AGC updates after sync can be programmed, and the AGC will he held until the next sync
event. Freeze holds the loop accumulator constant, the integrate and dump accumulator constant and the
interval timer constant. When freeze is released, the interval timer will resume counting.
A sync event will always reinitialize the integrate and dump interval timer, and terminate the pending
update to the loop accumulator from the current integrate and dump measurement interval. For example, if
a sync event occurs during an integrate and dump interval, that interval will be terminated without updating
the loop, and the integrate and dump accumulator will be cleared. After the programmed sync delay, a
new interval will start.
The AGC includes a dual threshold clip detect function, using two programmable 16-bit thresholds and
programmable counters. The clip detector will cause immediate loop accumulator updates while the clip
event is active. The 16-bit clip error value is aligned at the MSBs of the loop accumulator. Clip events are
qualified when a programmed number of samples are above the high clip threshold during the
programmable clip window time. For example, a clip event can be defined as 8 samples above the clip
high threshold in a 256 sample window; the clip high threshold, the number of samples above the high clip
threshold and the sample window time are programmable. Once the clip event has occurred, the clip
duration is controlled by the clip low threshold value, clip low samples value and clip low timer. The clip
event is cleared when the number of samples below the low clip threshold exceeds the programmed value
within the clip low timer window. The clip low threshold, number of clip low samples and the clip low
window timer are programmable.
The AGC blocks can be paired together, rxin_a with rxin_b, and rxin_c with rxin_d, to produce a complex
input AGC mode. The clip detector output from the rxin_b/d AGCs is logically OR’ed with the rxin_a/c clip
detect outputs. The squared input function before the integrate and dump and signal level detector is
replaced with a I2 + Q2 power calculation. The accumulator MSBs from the rxin_a/c AGCs are connected
to the rxin_c/d DVGA map table and gain map table inputs. This arrangement allows the AGCs to operate
in a direct conversion receiver system by controlling the I2 + Q2 complex signal level.
The highpass filter is a 32 bit accumulator followed by an adjustable shift to control the corner frequency,
a subtractor to remove the accumulated offset and a final limiter to produce a 16 bit result. The highpass
filter function is enabled by setting hp_ena; clearing hp_ena holds the accumulator reset.
8
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
32
Samples
from
ADC FIFO
−
16
hp_corner
3
17
shift
&
limit
+
16
hp_ena
17
16
limit
Samples to
X 2 block
Figure 3-6. High Pass Filter in Receive Input AGC
PROGRAMMING
VARIABLE
DESCRIPTION
ragc_bypass_X
Bypasses the entire receive AGC circuit when set. X = {0,1,2,3}
hp_ena_X
Enables high pass filter when set
hp_corner_X(2:0)
Adjusts the corner frequency of the high pass filter
integ_interval_X(23:0)
Integrate and dump signal power measurement interval in samples.
acc_shift_X(4:0)
Shift down amount following the integrate and dump accumulator.
acc_offset_X(5:0)
Offset value applied to the shifted integrate and dump output.
ragc_sync_delay_X(7:0)
AGC sync delay interval, from 1 to 256 samples.
ssel_ragc_interval_X(2:0)
Sync source selection for the interval timer.
ssel_ragc_freeze_X(2:0)
Sync source selection for AGC freeze
ssel_ragc_clear_X(2:0)
Sync source selection for the AGC loop accumulator clear
ragc_freeze_X
Register bit to freeze the AGC when set
ragc_clear_X
Register bit to clear the AGC accumulator when set
ragc_update_X(7:0)
Sets the number of updates per sync event, after which no further updates will occur until the next sync
event. Program to 0x00 to continually update.
sd_ena_X
Enables freezing the AGC with the signal detector when set
sd_thresh_X(15:0)
Signal detection threshold for AGC channel X. This 16 bit word is lined up with bits 23 down to 8 of the
square output. The smallest signal level is that can be programmed is therefore 16 LSBs on the ADC
input, and the largest is 4095 LSBs at the ADC input.
sd_samples_X(15:0)
The number of samples below the signal detect threshold within the signal detect sample timer window
required to freeze on the AGC.
sd _timer_X(15:0)
Window timer to qualify signal detection.
clip_hi_thresh_X(15:0)
Clip detector high threshold
clip_lo_thresh_X(15:0)
Clip detector low threshold
clip_hi_samples_X(7:0)
A clip event is detected when this number of samples above the clip high threshold within the clip high
sample timer window exceeds this value.
clip_lo_samples_X(7:0)
A clip event ends when this number of samples below the clip low threshold within the clip low sample
timer window exceeds this value.
clip_hi_timer_X(15:0)
Window timer to qualify clip events.
clip_lo_timer_X(15:0)
Window timer to determine when the clip event ends.
clip_error_X(15:0)
Error signal applied to the AGC accumulator when a clip event is active. This data is MSB aligned, and
therefore can cause immediate changes to the accumulator.
ragc_error_map_X
128w x 8b memory holding the log to error look up table.
dvga_map_X
64w x 6b memory holding the accumulator to DVGA look up table
gain_map_X
64w x 16b memory holding the accumulator to GAIN look up table (256 decibels is unity gain).
delay_adj_X(4:0)
Delay between DVGA output updates and gain map updates to compensate for ADC pipeline delays,
etc.
err_shift_X(4:0)
Error map table output shift up before adding to loop accumulator
RECEIVE DIGITAL SIGNAL PROCESSING
9
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
PROGRAMMING
VARIABLE
DESCRIPTION
complex_01
Enables complex AGC mode on inputs rxin_a and rxin_b when set
complex_23
Enables complex AGC mode on inputs rxin_c and rxin_d when set
ragc_accum_X(31:0)
32-bit read only register holding the current contents of the loop accumulator.
tristate(10:7)
3-state controls for the dvga_d/c/b/a output pins; pins are in tristate when the 3-state bits are set.
ragc_mpu_ram_read
When set, the receive AGC map rams are readable via the MPU control interface. The GC5018 signal
path is not operational when this bit is set, it is intended for debug purposes only.
3.1.4
Test and Noise Signal Generator
The test and noise generator can generate test signals to replace the rxin_a/b/c/d inputs as a tool for
debug, evaluation and self test. Checksum generators included in the individual DDC channels at the
outputs can be used in conjunction with the noise generator and the internal sync timer block to create the
built in self test function.
The test and noise signal source included in this block is a 23-bit linear feedback shift register (LFSR) with
a fixed polynomial and fixed initialization state. A sync input is required to initialize the LFSR, and the sync
source is connected to the ddc_counter output signal.
sync
LFSR
lfsr(22:0)
adcclk_X
initialized on sync event − each of the four generators has a different seed
22
5
0
Figure 3-7. Noise Signal Generator
Receive Input Port
10
LFSR Seed Value, MSB to LSB
rxin_a
100 0000 0000 0000 0001 0000 (0x400010)
rxin_b
010 0110 1110 0110 1100 1110 (0x26E6CE)
rxin_c
110 1110 1010 0010 1001 1000 (0x6EA298)
rxin_d
000 1011 0001 1110 1011 0111 (0x0B1EB7)
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
The 23-bit LFSR output signal if used to create a 16-bit “dout(15:0)” test signal using XOR combinations of
the LFSR bits.
lfsr(22)
lfsr(20)
lfsr(19)
lfsr(22)
lfsr(16)
dout(15)
lfsr(18)
lfsr(22)
lfsr(15)
dout(14)
lfsr(17)
lfsr(22)
lfsr(14)
dout(13)
lfsr(16)
lfsr(22)
lfsr(13)
dout(12)
lfsr(15)
lfsr(22)
lfsr(12)
dout(11)
lfsr(14)
lfsr(22)
lfsr(11)
dout(10)
lfsr(13)
lfsr(12)
lfsr(11)
lfsr(10)
dout(9)
dout(8)
dout(7)
dout(6)
dout(5)
dout(4)
dout(3)
dout(2)
dout(1)
dout(0)
Figure 3-8. Mapping of LFSR Values to Output Bits
To enable the test signal generator, the slf_tst_ena control bit is set. The rxin_a/b/c/d signals will be then
replaced by the four generator output streams. To use this test signal generator as a signal source for self
test, the user must also set the adc_fifo_bypass control bit. Setting the adc_fifo_bypass control bit causes
the adcclk_a/b/c/d input clocks to be internally replaced with rxclk/N, where N is as programmed with the
rate_sel(1:0) control bits to {1,2,4 or 8}.
The test signal generators can also output a programmable constant value. All four test signal generators
output the same programmable constant value.
RECEIVE DIGITAL SIGNAL PROCESSING
11
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
16
rxin_a
16
Test and
Noise
Generator
sync
16
data to FIFO for rxin_a
16
rxin_b
16
Test and
Noise
Generator
16
data to FIFO for rxin_b
16
rxin_c
16
Test and
Noise
Generator
16
data to FIFO for rxin_c
16
rxin_d
16
Test and
Noise
Generator
rduz_sens_ena
16
data to FIFO for rxin_d
slf_tst_ena
Figure 3-9. Block diagram of Noise Generator Input Options
The LFSR circuits can also be used to add noise to the rxin_a/b/c/d input signals by setting the
rduz_sens_ena control register bit. The magnitude of the noise added can be adjusted by programming
the nz_pwr_mask(15:0) control register. In the figure below, X = {a,b,c or d}.
16
16
rxin _X(15:0)
lfsr (15:0)
nz_pwr_mask(15:0)
to FIFO for rxin _X
16
16
16
16 XORs
16 ANDs
lfsr(17)
lfsr(16)
rduz_sens_ena
Figure 3-10. Detail Circuit for Adding Noise Generator Signal to rxin Signal
12
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
PROGRAMMING
VARIABLE
DESCRIPTION
slf_tst_ena
When set, the test signal generators replace the rxin_a/b/c/d input signals with internally generated
psuedo random sequences. The fifo_bypass bit must be set when this bit is set.
rduz_sens_ena
Enables the LFSR, adding noise to the ADC input data when set.
nz_pwr_mask(15:0)
Selects the power of the noise added to the ADC input data.
adc_fifo_bypass
When set, the FIFO is essentially bypassed, and the adcclk_a/b/c/d clock input ports are ignored.
ddc_counter(31:0)
32 bit general purpose counter interval
ddc_counter_width(7:0)
8 bit general purpose counter timeout width pulse
ssel_ddc_counter(2:0)
Sync source selection for the general purpose counter
self_test_constant(17:0)
18-bit self test constant value applied to all 4 rxin_a/b/c/d inputs when self_test_const_ena is set.
self_test_const_ena
Enables the self test constant value for rxin_a/b/c/d
3.1.5
Sample Delay Lines
The four sample delay line blocks each consist of a 64 register memory and a state machine. The state
machine uses a counter to control the write (input) pointer, and the programmed read offset register data
to create the read (output) pointer. Programming larger read offset register values increases the effective
delay at a resolution equal to the sample rate.
The read offset registers, delay_line_X, are double buffered. Writes to these registers may occur anytime,
but the actual values used by the circuit will not be updated until a delay line sync event occurs.
PROGRAMMING
VARIABLE
DESCRIPTION
delay_line_X(5:0)
Read offset into the 64 element memory for each delay line. X= {0,1,2,3}.
ssel_delay_line_X(2:0)
Selects the sync source used to update the double buffered delay line register.
3.1.6
Test Bus
When the test bus is enabled, the rxin_c(15:0) and rxin_d(15:0) ports become outputs, and the dvga_c
and dvga_d pins are combined with these pins to allow 36 bit wide signals from the DDC channels and the
receive input interface to be multiplexed to this test output port. Many of these sources can be decimated
to reduce the output sample rates.
RECEIVE DIGITAL SIGNAL PROCESSING
13
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
DDC0
MUX
ddc_tst_sel(5:0)
zeros
pfiroutput
cfiroutput
tadjchannel A
tadjchannel B
ncosin
ncocos
cicoutput
mixer i * cos & i * sin
mixer q * cos & q * sin
ddc mux channel A
ddc mux channel B
MUX
DECIMATE (35:20)
tst_select(3:0)
tst_decim17 (19:18)
tst_decim_delay (17:2)
(1:0)
tst_clk
tst_aflag
tst_sync
rxin_d(15:0)
dvga_c(3:2)
rxin_c(15:0)
dvga_c(5:4)
dvga_c(1)
dvga_d(5)
dvga_c(0)
DDC1
sync
DDC2
DDC3
DDC4
DDC5
DDC6
DDC7
Receive Interface
rxin_a & rxin_b FIFO outputs
Figure 3-11. Test Bus Output Circuit Showing Options for Selecting Signal
PROGRAMMING
VARIABLE
DESCRIPTION
ssel_tst_decim(2:0)
Selects the sync source for the testbus decimator
tst_decim_delay(3:0)
Sets the testbus decimator delay from sync
tst_decim17
When set the decimation factor of the test bus output block is 17X. When cleared, the decimation factor
is 1X (no decimation).
tst_on
Enables the test bus; rxin_c(15:0) and rxin_d(15:0) are changed from inputs to outputs, dvga_c(5:0) and
dvga_d(5) are used as part of the test bus.
tst_select(3:0)
Selects the source block for the testbus output; DDC0-7 or Receive Interface.
ddc_tst_sel(5:0)
Selects the signal to be output from the DDC block
tst_rate_sel(4:0)
Sets the testbus output clock tst_clk period to (tst_rate_sel + 1) rxclk cycles.
14
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
3.2
DDC Organization
18
18
18
18
4 to 2 (complex) or
4 to 1 (real) switch
CDMA DDC A
Output
Interface
or 1 UMTS DDC
4 to 2 (complex) or
CDMA DDC B
4 to 1 (real) switch
DDC0
DDC1
DDC2
DDC3
DDC4
DDC5
DDC6
DDC7
Figure 3-12. DDC Organization for Single Length Filter Mode
The GC5018 provides downconversion for up to 8 UMTS receive channels, 16 CDMA2000 receive
channels or 16 TD-SCDMA receive channels. Downconversion channels are organized into 8 DDC blocks.
Each individual DDC block provides 2 CDMA2000 or 2 TD-SCDMA DDC channels, A and B, or 1 UMTS
channel.
Both CDMA DDC channels in a DDC block can be independently tuned, though they would likely be used
as diversity pairs and tuned to the same frequency. Filter coefficients are shared between the two CDMA
DDC channels within a block.
Two adjacent DDC blocks (for example, DDC0 and DDC1) can be strapped together to form a single
UMTS DDC channel with double-length final pulse shaping filtering. The GC5018 can therefore provide 4
UMTS DDC channels with double-length final PFIR filtering as shown in the following diagram.
RECEIVE DIGITAL SIGNAL PROCESSING
15
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4 UMTS DDCs with up to 128 tap PFIR
18
18
18
18
4 to 2 (complex) or
CDMA DDC A
4 to 1 (real) switch
Output
Interface
4 to 2 (complex) or
CDMA DDC B
4 to 1 (real) switch
DDC0
DDC1
4 to 2 (complex) or
CDMA DDC A
4 to 1 (real) switch
Output
Interface
or 1 UMTS DDC
4 to 2 (complex) or
CDMA DDC B
4 to 1 (real) switch
DDC0 plus DDC1
DDC2 plus DDC3
DDC4 plus DDC5
DDC6 plus DDC7
Figure 3-13. DDC Organization for Double Length Filter Mode
PROGRAMMING
VARIABLE
DESCRIPTION
ddc_ena
When set, turns on the DDC.
cdma_mode
When set, puts the DDC block in dual channel CDMA mode.
gbl_ddc_write
When set, all subsequent programming (writes only) for DDC0 and DDC1 is also written to DDC2/4/6 and DDC3/5/7.
3.2.1
Downconverter Function Blocks
from
rx_distribution
bus
18
18
18
18
Delay
Adjust
4 to 2
Select
Frequency
Phase
32
16
NCO
CFIR
Filter
Dec by 2
Zero
Pad
Six Stage
CIC Filter
Dec 4 to 32
PFIR
Filter
Dec by 1
Checksum
Generator
AGC
RMS Power
Measure
Figure 3-14. DDC Functional Block Diagram
16
RECEIVE DIGITAL SIGNAL PROCESSING
Serial
Interface
serial I, Q
up to 18
(25−bits with
AGC disabled)
parallel I, Q
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Each GC5018 downconversion block can process two CDMA carriers or a single UMTS carrier. Signal
data is selected from one of four ports for real inputs, or two of four ports for complex inputs. Data from
the selected port(s) is multiplied with a complex, programmable numerically controlled oscillator (NCO)
which tunes the signal of interest to baseband. The delay adjust and zero pad blocks permits adjustment
of the delay in the end-to-end channel. Zero padding interpolates the signal to the rxclk rate. Filtering
consists of a six stage CIC filter which decimates the tuned data by a factor from 4 to 32, a compensating
FIR filter (CFIR) which decimates by a factor of two, followed by a programmable FIR filter (PFIR) which
does not decimate. The output interface block can be programmed to decimate by 2 if desired.
The RMS power meter measures the power within the channel’s bandwidth. The AGC automatically drives
the gain and keeps the magnitude of the signal at a user-specified level. This allows fewer bits to
represent the signal. The serial output interface formats and rounds the output data. Each of the above
blocks is described in greater detail in the following sections.
3.2.2
DDC Mixer
from
rx_distribution
bus
18
18
18
18
4 to 2
Select
Demux
and
Round
18
18
18
18
18
18
IA
QA
IB
QB
to
channel
delay
20
20
cos
sin
mixer_gain
from NCO
Figure 3-15. Mixer Functional Block Diagram
The receive mixer translates the input (from one of the input signal sources) to baseband where
subsequent filtering is performed to isolate the signal of interest. The mixer is a complex multiplier that
accepts 18 bit I and 18 bit Q signal data from the receive input interface and 20 bit Sine and Cosine
sequences from the NCO. The NCO generates a mixing frequency (sometimes referred to as a local
oscillator, or LO) specified by the user so that the desired signal of interest is tuned to 0 Hertz.
A DDC channel can support one UMTS signal directly, or two CDMA channels at half the input rate. When
in CDMA mode, each channel may be set independently; the path selection and the mixer tuning and
phase. The mixer output produces two complex streams; one representing the signal path for the A-side
DDC, the other the B-side. Each of these streams drives a channel delay and zero pad block.
The maximum input rate for UMTS is rxclk for either real or complex input data.
The maximum input rate in CDMA mode with real inputs is rxclk (remix_only is set, see below).
The maximum input rate in CDMA mode with complex inputs is rxclk/2 due to sharing of multiplier
resources.
RECEIVE DIGITAL SIGNAL PROCESSING
17
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
PROGRAMMING
VARIABLE
DESCRIPTION
ddcmux_sel_a(3:0)
Programs the I and Q complex input data routing onto two of the four input ports for stream A of CDMA DDC
ddcmux_sel_b(3:0)
Programs the I and Q complex input data routing onto two of the four input ports for stream B of CDMA DDC
remix_only
For CDMA mode only, set this bit for real input data at the rxclk rate.
For complex inputs in CDMA mode, the maximum input data rate is rxclk/2, and this bit must be cleared.
For CDMA mode with real inputs at the rxclk/2 rate or lower, this bit must be cleared
zero_qsample
When set, the Q samples used by the mixer are always zero. This bit should be set for real only inputs in UMTS
mode, or real only inputs in CDMA mode when the input sample rate is rxclk/2 or lower.
ch_rate_sel(1:0)
Specifies the input channel data rate (rxclk, rxclk/2, rxclk/4, or rxclk/8 MSPS).
mixer_gain
When asserted, adds 6dB of gain in the mixer. This gain is highly recommended.
3.2.3
DDC Number Controlled Oscillator (NCO)
Frequency Sync
Frequency Word
32
Reg
32
Reg
32
23
23
Clear
Aligned
to top
32 bits
Zero Phase Sync
Phase Offset Sync
5
sin/cos
table
20
cos
20
sin
Aligned
to bottom
5 bits
Dither
Generator
Phase Offset
16
Reg
16
Dither Sync
Figure 3-16. Detailed NCO Circuit
The NCO is a digital complex oscillator that is used to translate (or downconvert) an input signal of interest
to baseband. The block produces programmable complex digital sinusoids by accumulating a frequency
word which is programmed by the user. The output of the accumulator is a phase argument that indexes
into a sin/cos ROM table which produces the complex sinusoid. A phase offset can be added prior to
indexing if desired for channel calibration purposes. This will change the sin/cos phase with respect to
other channels’ NCOs.
A 5-bit dither generator is provided and generates a small level of digital pseudo-noise that is added to the
phase argument below the bottom bits and is useful for reducing NCO spurious outputs. This dither
generation is enabled by setting the dither_ena bit; the magnitude of the dither can be reduced by setting
one or both of the dither_mask bits
DITHER PROGRAMMING
VARIABLE
DESCRIPTION
dither_ena
When set turns dither on. Clearing turns dither off.
dither_mask(1:0)
Masks the MSB and MSB-1 dither bits, respectively, when set.
The NCO spurious levels are better than –115 dBc. Added phase dither randomizes the periodic nature of
the phase accumulation process and reduces low-level spurious energy. For some frequencies (N x Fs/24,
where N = {1,2, . . . 23}) dither is ineffective – in these cases an initial phase of 4 reduces NCO spurs. The
figures below show the spur level performance of the NCO without dither, with dither, and with a phase
offset value.
18
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
a) Worst Case Spectrum Without Dither
b) Spectrum With Dither (Tuned to Same Frequency
Figure 3-17. NCO SFDR - Without Dither
Figure 3-18. NCO SFDR - With Dither
Frequency − Fs
Frequency − Fs
a) Plot Without Dither or Phase Initialization
Figure 3-19. NCO Spectra (0 and Fs/4) - Without Dither or
Phase Initialization
b) Plot With Dither or Phase Initialization
Figure 3-20. NCO Spectra (0 and Fs/4) - With Dither or
Phase Initialization
The tuning frequency is specified as a 32 bit Frequency Word and is programmed as two sequential 16 bit
words over the control port. The NCO frequency resolution is Fclk/ 232. As an example, at an input clock
rate of 61.44 MHz, the frequency step size would be approximately 14 milli-Hertz. The Frequency Word is
determined by the formula:
Frequency Word (in decimal)= 232 x Tuning Frequency / Fclk
Note that frequency tuning words can be positive or negative valued. Specifying a positive frequency
value translates complex negative frequencies upwards towards 0 Hertz. Specifying a negative tuning
frequency translates complex positive frequencies downwards towards 0 Hertz.
FREQUENCY PROGRAMMING
VARIABLE
DESCRIPTION
phase_add_a(31:0)
32 bit tuning frequency word for the A-side DDC when in CDMA mode. Also for UMTS mode.
phase_add_b(31:0)
32 bit tuning frequency word for the B-side DDC when in CDMA mode. Not used in UMTS mode.
Each of the 16 CDMA DDC channels can be loaded with unique frequency words.
The phase of the NCO’s Sin/Cos output can be adjusted relative to the phase of other channel NCOs by
specifying a Phase Offset. The Phase Offset is programmed as a 16 bit word, yielding a step size of about
5.5 m°. The Phase Offset Word is determined by the formula:
Phase Offset Word = 216 x Offset_in_Degrees / 360 or,
Phase Offset Word = 216 x Offset_in_Radians / 2π
RECEIVE DIGITAL SIGNAL PROCESSING
19
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
PHASE PROGRAMMING
VARIABLE
DESCRIPTION
phase_offset_a(15:0)
16 bit phase offset word for the A-side DDC when in CDMA mode. Also for UMTS mode.
phase_offset_b(15:0)
16 bit phase offset word for the B-side DDC when in CDMA mode. Not used in UMTS mode.
Each of the 16 CDMA DDC channels can be loaded with unique phase offset words.
Various synchronization signals are available which are used to synchronize the NCOs of all channels
with respect to each other. Frequency Sync and Phase Offset Sync determine when frequency and phase
offset changes occur. For example, generating a Frequency Sync after programming the two frequency
words will cause the NCO (or multiple NCOs) to change frequency at that time, rather than after each of
the three frequency words is programmed over the control bus. The Zero Phase Sync signal is used to
force the sine and cosine oscillators to their zero phase state. Dither Sync can be used to synchronize the
dither generators of multiple NCOs. The NCOs used in the transmit section are identical to what is
described for the receive section. Note that there is one set of sync’s provided for each DDC. When one
DDC is used to process two CDMA signals, the syncs are shared between them.
SYNC PROGRAMMING
VARIABLE
DESCRIPTION
ssel_nco(2:0)
Sync source for NCO accumulator reset
ssel_dither(2:0)
Sync source for NCO dither reset
ssel_freq(2:0)
Sync source for NCO frequency register loading
ssel_phase(2:0)
Sync source for NCO phase register loading
3.2.4
DDC Filtering and Decimation
The purpose of the receive filter chain is to isolate the signal of interest (and reject all others) that has
been previously translated to baseband via the mixer and NCO. The overall decimation through the chain
needs to be considered. The goal, generally, is to output the isolated signal at a rate that is twice (2X) the
signal’s chip rate. For UMTS this would be 7.68 MSPS and for CDMA the output rate should be 2.4576
MSPS. TD-SCDMA systems require the output rate be the chip rate of 1.28 MSPS. The output interface is
programmed to decimate by 2 for the TD-SCDMA case.
Receive filtering and decimation is performed in several stages:
• Zero padding to interpolate the input sample rate (if needed) up to the rxclk rate
• High rate decimation (4 to 32) using a six stage cascade-integrate-comb filter (CIC)
• Decimate by two compensation filtering using the programmable compensating FIR filter (CFIR)
• Pulse-shape filtering via the programmable FIR filter (PFIR) with no decimation
• Output interface, serial or parallel format, with no decimation or decimate by 2
From
Mixer
Delay
Adjust
Zero Pad
Interp by {1,2,4,8}
Six Stage
CIC Filter
Dec by {4 −32}
CFIR Filter
Dec by 2
PFIR Filter
no decimation
Output Interface
Dec by {1,2}
Figure 3-21. DDC Filtering Functional Block Diagram
The table below contains some examples of decimation and sample rates at the output of each block for
UMTS, CDMA and TD-SCDMA standards at various supported input samples. For each example, the
differential ADC clocks are provided to the GC5018 at the input sample rate and the rxclk is provided at
the zero pad output rate.
20
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Table 3-1. Examples of Decimation and Sample Rates (1)
Input
Sample
Rate
(MSPS)
Zeros
Added
rxclk(MHz) and
Zero Pad
Output Rate
(MSPS)
CIC
Decimation
CIC
Output
Rate
(MSPS)
CFIR
Decimation
CFIR
Output
Rate
(MSPS)
PFIR
Decimation
PFIR
Output
Rate
(MSPS)
Output
Decimation
UMTS
122.88
0
122.88
8
15.36
2
7.68
1
7.68
1
UMTS
92.16
0
92.16
6
15.36
2
7.68
1
7.68
1
UMTS
76.80
1
153.6
10
15.36
2
7.68
1
7.68
1
UMTS
61.44
1
122.88
8
15.36
2
7.68
1
7.68
1
CDMA
122.88
0
122.88
25
4.9152
2
2.4576
1
2.4576
1
CDMA
78.6432
0
78.6432
16
4.9152
2
2.4576
1
2.4576
1
CDMA
78.6432
1
157.2864
32
4.9152
2
2.4576
1
2.4576
1
CDMA
61.44
1
122.88
25
4.9152
2
2.4576
1
2.4576
1
TD-SCDMA
92.16
0
92.16
18
5.12
2
2.56
1
2.56
2
TD-SCDMA
81.92
0
81.92
16
5.12
2
2.56
1
2.56
2
TD-SCDMA
76.80
0
76.80
15
5.12
2
2.56
1
2.56
2
TD-SCDMA
76.80
1
153.6
30
5.12
2
2.56
1
2.56
2
TD-SCDMA
61.44
1
122.88
24
5.12
2
2.56
1
2.56
2
(1)
The DDC output interfaces, both serial and parallel formats, can be programmed to decimate by 2. For the TD-SCDMA examples listed
above, the DDC output rate is 1.28Msps (1x chip rate).
3.2.5
DDC Channel Delay Adjust and Zero Insertion
interpolation
(number of zeros stuffed between samples)
input rate I
samples from
Q
Mixer
read offset
18
Delay Memory
I:8 slots x 18−bits
Q:8 slots x 18−bits
18
3
18
18
Zero
Pad
18
I
18
Q
full rxclk rate
samples to
CIC Filter
3
sync (offset registers)
sync (zero stuff moment)
insert offset
3
Figure 3-22. DDC Delay and Zero Insertion Block
The Receive Channel Delay Adjust function is used to add programmable delays in the channel
downconvert path. Adjusting channel delay can be used to compensate for analog elements external to
the GC5018 digital downconversion such as cables, splitters, analog downconverters, filters, etc.
The Delay Memory block consists of an 8 register memory and a state machine. The state machine uses
a counter to control the write (input) pointer, and the programmed read offset register data to create a
read (output) pointer. Programming larger read offset register values increases the effective delay at a
resolution equal to the input sample rate.
The Zero Pad block is used in conjunction with the Delay Memory for delay adjustments. For example,
with input rates of rxclk/8, the Zero Pad block interpolates the input data to rxclk by inserting 7 zeros. The
Zero Pad’s sync insert offset 3-bit control specifies when the zeros are inserted relative to the Sync signal.
This permits a fine adjustment at the rxclk resolution.
RECEIVE DIGITAL SIGNAL PROCESSING
21
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
The read offset register, tadf_offset_course_a/b, and the insert offset register, tadj_offset_fine_a/b, are
double buffered. Writes to these registers may occur anytime, but the actual values used by the circuit will
not be updated until a register sync
PROGRAMMING
VARIABLE
DESCRIPTION
tadj_offset_coarse_a(2:0)
Read offset into the 8 element memory for the UMTS or CDMA mode A channel DDC.
tadj_offset_coarse_b(2:0)
Read offset into the 8 element memory for the CDMA mode B channel DDC when in CDMA mode.
tadj_offset_fine_a(2:0)
Controls the zero pad (or stuff) insert offset (fine adjust) for the UMTS or CDMA mode A channel of the
DDC.
tadj_offset_fine_b(2:0)
Controls the zero pad (or stuff) insert offset (fine adjust) for the CDMA mode B channel of the DDC
when in CDMA mode.
tadj_interp(2:0)
The interpolation value (1, 2, 4, or 8). Same used for both the A and B channels when in CDMA mode.
Selects the number of zeros to be inserted.
ssel_tadj_fine(2:0)
Selects the sync source for the fine time adjust zero stuff moment. Same for A and B channels when in
CDMA mode.
ssel_tadj_reg(2:0)
Selects the sync source used to update the double buffer course and fine delay selection registers.
Same for A and B channels when in CDMA mode.
3.2.6
DDC CIC Filter
Shift
18
Z
−1
N
Z
−1
Z
Z −m1
Z −m 2
−1
Z
Z
−m 3
−1
Z
Z −m 4
−1
Z
Z
−m 5
−1
54
24
Z −m 6
24
Decimate
by 4−32
Sh ift
0−3 1
Round
&
L imit
18
m1, m2, m3, m4, m5, m6 = 1 or 2
Figure 3-23. DDC CIC Filter Block Diagram
The CIC filter provides the first stage of filtering and large-value decimation. The filter consists of six
stages and decimates over a range from 4 to 32.
I data and Q data are handled separately with two CIC filters. In addition, when in CDMA mode (two
CDMA channels processed within a single DDC), another pair of CIC filters handles the B-side channel.
The filter response is 6x(Sin(x)/x) in character where the key attribute is that the resulting response nulls
reject signal aliases from decimation. A consequence of this desirable behavior is that only a small portion
of the passband can be used, less than 25% generally. This means that the CIC decimation value should
be chosen so that the signal exiting the CIC filter is oversampled by at least a factor of four.
The filter is equivalent to 6 stages of a FIR filter with uniform coefficients (6 combined boxcar filter stages).
Each filter would be of length N if m=1, or 2N if m=2.
The filter is made up of six banks of 54 bit accumulator sections followed by six banks of 24 bit subtractor
sections. Each of the subtractor sections can be independently programmed with a differential delay of
either one or two. A shift block follows the last integration stage and can shift the 54 bit accumulated data
down by 36-rcic_shift (a programmable factor from 0 to 31 bits).
22
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
The CIC filter exhibits a droop across its frequency response. The following CFIR filter compensates for
the CIC droop with a gradually rising frequency response. It is also possible to compensate for CIC droop
in the PFIR filter.
The gain of the receive CIC filter is:
Ncic6 x 2(number of stages where M=2) x 2(–36+RCIC_SHIFT) where RCIC_SHIFT is 0 to 31.
There is no rollover protection internal to the CIC or at the final round so the user must guarantee no
sample exceeds full scale prior to rounding. For practical purposes this means the CIC gain can only
compensate for peak gain less than one or must be less than or equal to one. A fixed gain of +12 dB at
the output of the CIC can also be programmed.
PROGRAMMING
VARIABLE
DESCRIPTION
cic_decim(4:0)
The CIC decimation ratio (4 to 32). The ratio is cic_decim + 1. This ratio applies to both A and B channels of
the DDC block in CDMA mode.
cic_scale_a(4:0)
The shift value for the A channel. A value of 0 is no shift, each increment in value increases the amplitude of
the shifter output by a factor of 2.
cic_scale_b(4:0)
The shift value for the B channel. A value of 0 is no shift, each increment in value increases the amplitude of
the shifter output by a factor of 2.
cic_gain_ddc
When asserted, adds a gain of 12 dB at the CIC output.
cic_m2_ena_a(5:0)
Sets the differential delay value M for each of the CIC subtractor stages for the UMTS or CDMA mode A
channel.
cic_m2_ena_b (5:0)
Sets the differential delay value M for each of the CIC subtractor stages for the CDMA mode B channel.
cic_bypass
Bypasses the CIC filter when set, for factory testing.
ssel_cic(2:0)
Sets syncing (1 of 8 sources) for the CIC decimation moment.
3.2.7
DDC Compensating FIR Filter (CFIR)
The receive compensating FIR filter (CFIR) decimates the output of the CIC filter by a fixed factor of two.
Filter coefficient size, input data size, and output data size are 18 bits. The CFIR length can be
programmed. This permits “turning off” taps and saving power if shorter filters are appropriate (the CFIR
power dissipation is proportional to its length).
The filter is organized in two partial filter blocks, each containing a data RAM, a coefficient RAM and a
dual multiplier, a common state machine and output accumulator.
RECEIVE DIGITAL SIGNAL PROCESSING
23
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
MPU control
interface
read data
write data
write pointer
COEF
RAM
32x18
mpu
ram_read
COEF
RAM
32x18
reg
MUX
complex
output
samples
read pointer
complex
input
samples
DATA
RAM
64x36
DATA
RAM
64x36
read
pointer
write
pointer
output
sample
valid
State Machine
crastarttap
Figure 3-24. DDC CFIR Block Diagram
The maximum CFIR filter length is a function of GC5018 clock rate, output sample rate and the number of
coefficient memory registers. The maximum number of taps is 64 and the minimum number is 14. Lengths
between these limits can be specified in increments of 2.
Subject to the above minimum and maximum values, in the general case, the number of taps available is:
UMTS Mode: 2 x (rxclk ÷ output sample rate)
CDMA Mode if cic_decim is even (decimating by an odd number): 2 x (cic_decim)
CDMA Mode if cic_decim is odd (decimating by an even number): 2 x (cic_decim + 1)
Example CFIR filter lengths available based on mode and rxclk frequency:
Mode
rxclk
(MHz)
CIC
DECIMATION
cic_decim
CFIR
MAX LENGTH
CFIR
MIN LENGTH
UMTS
153.60
10
9
40
14
UMTS
UMTS
122.88
8
7
32
14
UMTS
CDMA
157.2864
32
31
64
14
CDMA2000
CDMA
122.88
25
24
48
14
CDMA2000
CDMA
78.6432
16
15
32
14
CDMA2000 low power configuration
CDMA
153.60
30
29
60
14
TD-SCDMA
CDMA
81.92
16
15
32
14
TD-SCDMA
CDMA
76.80
15
14
28
14
TD-SCDMA low power configuration
24
RECEIVE DIGITAL SIGNAL PROCESSING
COMMENTS
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
A single set of programmed tap values are used for both the A-side and B-side DDC channels (two CDMA
channels) within a single DDC block when in CDMA mode.
After the CFIR filter performs the convolution, gain is applied at full precision, the signal is rounded, and
then hard limited. A shifter at the output of the filter then scales the data by either 2e-19 or 2e-18. The
gain through the filter is therefore:
Sum(CFIR coefficients) x 2 –(18 or 19)
Coefficients are organized in two groups of 32 words, each 18 bits wide. For fully utilized filters, the 64
coefficients are loaded 0 through 31 into the first RAM, and 32 through 63 into the second RAM. The 16
bit MSBs and 2 bit LSBs are written into the RAMs using different page register values. Shorter filters
require the coefficients be loaded into the 2 rams equally, starting from address 0.
For example, a CFIR coefficient set for a symmetric 58 tap TD-SCDMA CFIR is:
Taps
Coefficient
Taps
Coefficient
0 = 57
–13
15 = 42
–4975
1 = 56
–20
16 = 41
–4649
2 = 55
14
17 = 40
–232
3 = 54
101
18 = 39
6581
4 = 53
184
19 = 38
11266
5 = 52
133
20 = 37
8917
6 = 51
–147
21 = 36
–1957
7 = 50
–562
22 = 35
–16736
8 = 49
–768
23 = 34
–25469
9 = 48
–364
24 = 33
– 17599
10 = 47
719
25 = 32
11560
11 = 46
1905
26 = 31
56455
12 = 45
2126
27 = 30
102215
13 = 44
567
28 = 29
131071
14 = 43
–2416
The first 29 coefficients are loaded into addresses 0 through 28 in the first coefficient RAM, and the
remaining 29 are loaded into addresses 0 through 28 in the second coefficient RAM. Loading the 18 bit
coefficients requires 2 writes per coefficient, one for the upper 16 bits and another for the lower 2 bits.
To program this coefficient set for the DDC2 CFIR, the following control microprocessor interface
sequence would be used.
Step
Address
a[5:0]
Data
d[15:0]
Description
1
0x21
0x0480
Page register for DDC2 CFIR Coefficient RAM 0-31, LSBs.
2
0x00
0x0003
2 lower bits of coefficient 0
3
0x01
0x0000
2 lower bits of coefficient 1
4
0x02
0x0002
2 lower bits of coefficient 2
5
0x03
0x0001
2 lower bits of coefficient 3
6
0x04
0x0000
2 lower bits of coefficient 4
7
0x05
0x0001
2 lower bits of coefficient 5
8
0x06
0x0001
2 lower bits of coefficient 6
9
0x07
0x0002
2 lower bits of coefficient 7
10
0x08
0x0000
2 lower bits of coefficient 8
11
0x09
0x0000
2 lower bits of coefficient 9
12
0x0A
0x0003
2 lower bits of coefficient 10
RECEIVE DIGITAL SIGNAL PROCESSING
25
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Step
26
Address
a[5:0]
Data
d[15:0]
Description
13
0x0B
0x0001
2 lower bits of coefficient 11
14
0x0C
0x0002
2 lower bits of coefficient 12
15
0x0D
0x0003
2 lower bits of coefficient 13
16
0x0E
0x0000
2 lower bits of coefficient 14
17
0x0F
0x0001
2 lower bits of coefficient 15
18
0x10
0x0003
2 lower bits of coefficient 16
19
0x11
0x0000
2 lower bits of coefficient 17
20
0x12
0x0001
2 lower bits of coefficient 18
21
0x13
0x0002
2 lower bits of coefficient 19
22
0x14
0x0001
2 lower bits of coefficient 20
23
0x15
0x0003
2 lower bits of coefficient 21
24
0x16
0x0000
2 lower bits of coefficient 22
25
0x17
0x0003
2 lower bits of coefficient 23
26
0x18
0x0001
2 lower bits of coefficient 24
27
0x19
0x0000
2 lower bits of coefficient 25
28
0x1A
0x0003
2 lower bits of coefficient 26
29
0x1B
0x0003
2 lower bits of coefficient 27
30
0x1C
0x0003
2 lower bits of coefficient 28
31
0x1D
0x0000
2 lower bits of unused coefficient RAM location
32
0x1E
0x0000
2 lower bits of unused coefficient RAM location
33
0x1F
0x0000
2 lower bits of unused coefficient RAM location
34
0x21
0x04A0
Page register for DDC2 CFIR Coefficient RAM 32-63, LSBs.
35
0x00
0x0003
2 lower bits of coefficient 29
36
0x01
0x0003
2 lower bits of coefficient 30
37
0x02
0x0003
2 lower bits of coefficient 31
38
0x03
0x0000
2 lower bits of coefficient 32
39
0x04
0x0001
2 lower bits of coefficient 33
40
0x05
0x0003
2 lower bits of coefficient 34
41
0x06
0x0000
2 lower bits of coefficient 35
42
0x07
0x0003
2 lower bits of coefficient 36
43
0x08
0x0001
2 lower bits of coefficient 37
44
0x09
0x0002
2 lower bits of coefficient 38
45
0x0A
0x0001
2 lower bits of coefficient 39
46
0x0B
0x0000
2 lower bits of coefficient 40
47
0x0C
0x0003
2 lower bits of coefficient 41
48
0x0D
0x0001
2 lower bits of coefficient 42
49
0x0E
0x0000
2 lower bits of coefficient 43
50
0x0F
0x0003
2 lower bits of coefficient 44
51
0x10
0x0002
2 lower bits of coefficient 45
52
0x11
0x0001
2 lower bits of coefficient 46
53
0x12
0x0003
2 lower bits of coefficient 47
54
0x13
0x0000
2 lower bits of coefficient 48
55
0x14
0x0000
2 lower bits of coefficient 49
56
0x15
0x0002
2 lower bits of coefficient 50
57
0x16
0x0001
2 lower bits of coefficient 51
58
0x17
0x0001
2 lower bits of coefficient 52
59
0x18
0x0000
2 lower bits of coefficient 53
60
0x19
0x0001
2 lower bits of coefficient 54
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Step
Address
a[5:0]
Data
d[15:0]
Description
61
0x1A
0x0002
2 lower bits of coefficient 55
62
0x1B
0x0000
2 lower bits of coefficient 56
63
0x1C
0x0003
2 lower bits of coefficient 57
64
0x1D
0x0000
2 lower bits of unused coefficient RAM location
65
0x1E
0x0000
2 lower bits of unused coefficient RAM location
66
0x1F
0x0000
2 lower bits of unused coefficient RAM location
67
0x21
0x04C0
Page register for DDC2 CFIR Coefficient RAM 0-31, MSBs.
68
0x00
0xFFFC
Upper 16 bits of coefficient 0
69
0x01
0xFFFB
Upper 16 bits of coefficient 1
70
0x02
0x0003
Upper 16 bits of coefficient 2
71
0x03
0x0019
Upper 16 bits of coefficient 3
72
0x04
0x002E
Upper 16 bits of coefficient 4
73
0x05
0x0021
Upper 16 bits of coefficient 5
74
0x06
0xFFDB
Upper 16 bits of coefficient 6
75
0x07
0xFF73
Upper 16 bits of coefficient 7
76
0x08
0xFF40
Upper 16 bits of coefficient 8
77
0x09
0xFFA5
Upper 16 bits of coefficient 9
78
0x0A
0x00B3
Upper 16 bits of coefficient 10
79
0x0B
0x01DC
Upper 16 bits of coefficient 11
80
0x0C
0x0213
Upper 16 bits of coefficient 12
81
0x0D
0x008D
Upper 16 bits of coefficient 13
82
0x0E
0xFDA4
Upper 16 bits of coefficient 14
83
0x0F
0xFB24
Upper 16 bits of coefficient 15
84
0x10
0xFB75
Upper 16 bits of coefficient 16
85
0x11
0xFFC6
Upper 16 bits of coefficient 17
86
0x12
0x066D
Upper 16 bits of coefficient 18
87
0x13
0x0B00
Upper 16 bits of coefficient 19
88
0x14
0x08B5
Upper 16 bits of coefficient 20
89
0x15
0xFE16
Upper 16 bits of coefficient 21
90
0x16
0xEFA8
Upper 16 bits of coefficient 22
91
0x17
0xE720
Upper 16 bits of coefficient 23
92
0x18
0xEED0
Upper 16 bits of coefficient 24
93
0x19
0x0B4A
Upper 16 bits of coefficient 25
94
0x1A
0x3721
Upper 16 bits of coefficient 26
95
0x1B
0x63D1
Upper 16 bits of coefficient 27
96
0x1C
0x7FFF
Upper 16 bits of coefficient 28
97
0x1D
0x0000
Upper 16 bits of unused coefficient RAM location
98
0x1E
0x0000
Upper 16 bits of unused coefficient RAM location
99
0x1F
0x0000
Upper 16 bits of unused coefficient RAM location
100
0x21
0x04E0
Page register for DDC2 CFIR Coefficient RAM 32-63, MSBs.
101
0x00
0x7FFF
Upper 16 bits of coefficient 29
102
0x01
0x63D1
Upper 16 bits of coefficient 30
103
0x02
0x3721
Upper 16 bits of coefficient 31
104
0x03
0x0B4A
Upper 16 bits of coefficient 32
105
0x04
0xEED0
Upper 16 bits of coefficient 33
106
0x05
0xE720
Upper 16 bits of coefficient 34
107
0x06
0xEFA8
Upper 16 bits of coefficient 35
108
0x07
0xFE16
Upper 16 bits of coefficient 36
RECEIVE DIGITAL SIGNAL PROCESSING
27
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Step
Address
a[5:0]
Data
d[15:0]
Description
109
0x08
0x08B5
Upper 16 bits of coefficient 37
110
0x09
0x0B00
Upper 16 bits of coefficient 38
111
0x0A
0x066D
Upper 16 bits of coefficient 39
112
0x0B
0xFFC6
Upper 16 bits of coefficient 40
113
0x0C
0xFB75
Upper 16 bits of coefficient 41
114
0x0D
0xFB24
Upper 16 bits of coefficient 42
115
0x0E
0xFDA4
Upper 16 bits of coefficient 43
116
0x0F
0x008D
Upper 16 bits of coefficient 44
117
0x10
0x0213
Upper 16 bits of coefficient 45
118
0x11
0x01DC
Upper 16 bits of coefficient 46
119
0x12
0x00B3
Upper 16 bits of coefficient 47
120
0x13
0xFFA5
Upper 16 bits of coefficient 48
121
0x14
0xFF40
Upper 16 bits of coefficient 49
122
0x15
0xFF73
Upper 16 bits of coefficient 50
123
0x16
0xFFDB
Upper 16 bits of coefficient 51
124
0x17
0x0021
Upper 16 bits of coefficient 52
125
0x18
0x002E
Upper 16 bits of coefficient 53
126
0x19
0x0019
Upper 16 bits of coefficient 54
127
0x1A
0x0003
Upper 16 bits of coefficient 55
128
0x1B
0xFFFB
Upper 16 bits of coefficient 56
129
0x1C
0xFFFC
Upper 16 bits of coefficient 57
130
0x1D
0x0000
Upper 16 bits of unused coefficient RAM location
131
0x1E
0x0000
Upper 16 bits of unused coefficient RAM location
132
0x1F
0x0000
Upper 16 bits of unused coefficient RAM location
133
0x21
0x0500
Page register for DDC2 control registers 0-31
134
0x00
0x8EE0
DDC2 FIR_MODE register; cdma_mode enabled, 60 tap PFIR, 58 tap CFIR
135
0x01
0x2000
DDC2 PFIR gain = sum(taps)x2^–18 and CFIR gain = sum(taps)x2^–19
PROGRAMMING
VARIABLE
DESCRIPTION
crastarttap_cfir(4:0)
Number of DDC CFIR filter taps is 2x(crastarttap + 1)
mpu_ram_read
What set, the PFIR and CFIR coefficient rams are readable via the MPU control interface. The GC5018 signal
path is not operational when this bit is set, it is intended for debug purposes only.
cfir_gain
0 = 2e–19, 1 = 2e–18
The CFIR filter’s 18 bit coefficients are loaded in two 32 word memories.
Note: CFIR filter coefficients are shared between A and B channels of a DDC block in CDMA mode.
3.2.8
DDC Programmable FIR Filter (PFIR)
The receive programmable FIR filter (PFIR) provides final pulse shaping of the baseband signal data. It
does not perform any decimation. Filter coefficient size, input, and output data size is 18 bits. A special
strapped mode can be employed for UMTS where two adjacent DDCs (2k & 2k+1, k=0 to 7) can be
combined to yield a filter with twice the number of coefficients. This means the GC5018 can support 4
UMTS DDC channels with double-length filter coefficients (up to 128 taps).
The filter is organized in four partial filter blocks, each containing a data RAM, a coefficient RAM and a
dual multiplier, a common state machine and output accumulator.
28
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
MPU control
interface
read data
write data
write pointer
Filter cell 1
cell 2
cell 3
cell 4
COEF
RAM
16x18
mpu
ram_read
reg
MUX
from adjacent DDC
(if double_tap=”10”)
read pointer
complex input
samples from cfir
(or adjacent DDC if
double_tap=”01”)
to adjacent DDC
(if double_tap=“10” )
DATA
RAM
32x36
read
pointer
write
pointer
crastarttap
complex
output
samples
output
sample
valid
State Machine
Figure 3-25. DDC PFIR Block Diagram
The PFIR length is programmable. This permits turning off taps and saving power if short filters are
appropriate. The filter’s output data can be shifted over a range of 0 to 7 bits where it is then rounded and
hard limited to 18 bits. The shift range results in a gain that ranges from 2e–19 to 2e–12.
The gain of the PFIR block is: sum(coefficients) × 2-shift, where shift ranges from 12 to 19.
The maximum PFIR filter length is a function of GC5018 clock rate and output sample rate and is limited
by the number of coefficient memory registers. The maximum number of taps is 64 and the minimum
number is 32 (for both CDMA and UMTS). Lengths between these limits can be specified in increments of
4. For strapped UMTS with double length filters, the range of taps available is 64 to 128 in increments of
8.
Subject to the above minimum and maximum values, the number of maximum taps available is:
UMTS Mode: 4 × (CIC DECIMATION × 2)
Strapped UMTS Mode: 8 × (CIC DECIMATION × 2)
CDMA Mode: 2 × (CIC DECIMATION × 2)
PFIR coefficients and gain shift values are shared between both A and B CDMA channels in a DDC block.
Example PFIR filter lengths available based on mode and rxclk frequency:
RECEIVE DIGITAL SIGNAL PROCESSING
29
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Mode
rxclk
(MHz)
CIC
DECIMATIO
N
PFIR
MAX LENGTH
PFIR
MIN LENGTH
COMMENTS
UMTS
153.60
10
64
32
UMTS, 1 to 6 DDC channels
UMTS
122.88
8
64
32
UMTS, 1 to 6 DDC channels
UMTS
153.60
10
128
64
Strapped UMTS double length PFIR configuration; 1, 2 or 3 DDC
channels.
UMTS
122.88
8
128
64
Strapped UMTS double length PFIR configuration; 1, 2 or 3 DDC
channels
CDMA
157.2864
32
64
32
CDMA2000
CDMA
122.88
25
64
32
CDMA2000
CDMA
78.6432
16
64
32
CDMA2000 low power configuration
CDMA
153.60
30
64
32
TD-SCDMA
CDMA
81.92
16
64
32
TD-SCDMA
CDMA
76.80
15
60
32
TD-SCDMA low power configuration
Coefficients are organized in four groups of 16 words, each 18 bits wide. For fully utilized filters, the 64
coefficients are loaded 0 through 31 into the first and second RAMs, and 32 through 63 into the third and
fourth RAMs. The 16 bit MSBs and 2 bit LSBs are written into the RAMs using different page register
values. Shorter filters require the coefficients be loaded into the 4 rams equally, starting from address 0
and address 16.
For example, a CFIR coefficient set for a symmetric 60 tap TD-SCDMA PFIR is:
Taps
Coefficient
Taps
0 = 59
–2
15 = 44
Coefficient
420
1 = 58
1
16 = 43
–331
2 = 57
4
17 = 42
–319
3 = 56
–8
18 = 41
744
4 = 55
–2
19 = 40
–440
5 = 54
21
20 = 39
–1005
6 = 53
–13
21 = 38
2389
7 = 52
–28
22 = 37
514
8 = 51
46
23 = 36
–6182
9 = 50
1
24 = 35
1845
10 = 49
–85
25 = 34
12959
11 = 48
96
26 = 33
–8691
12 = 47
82
27 = 32
–27246
13 = 46
–266
28 = 31
34166
14 = 45
38
29 = 30
131071
The first 15 coefficients are loaded into addresses 0 through 14 in the first coefficient RAM, the second
group of 15 are loaded into addresses 16 through 30 corresponding to the second coefficient RAM, the
third group of 15 are loaded into the third coefficient ram at addresses 0 through 14, and the fourth group
of 15 are loaded into addresses 16 through 30 in the fourth coefficient RAM. Loading the 18 bit
coefficients requires 2 writes per coefficient, one for the upper 16 bits and another for the lower 2 bits.
To program this coefficient set for the DDC2 PFIR, the following control microprocessor interface
sequence would be used.
30
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Step
Address
a[5:0]
Data
d[15:0]
Description
1
0x21
0x0400
Page register for DDC2 CFIR Coefficient RAMs 0-15 and 16-31, LSBs.
2
0x00
0x0002
2 lower bits of coefficient 0
3
0x01
0x0001
2 lower bits of coefficient 1
4
0x02
0x0000
2 lower bits of coefficient 2
5
0x03
0x0000
2 lower bits of coefficient 3
6
0x04
0x0002
2 lower bits of coefficient 4
7
0x05
0x0001
2 lower bits of coefficient 5
8
0x06
0x0003
2 lower bits of coefficient 6
9
0x07
0x0000
2 lower bits of coefficient 7
10
0x08
0x0002
2 lower bits of coefficient 8
11
0x09
0x0001
2 lower bits of coefficient 9
12
0x0A
0x0003
2 lower bits of coefficient 10
13
0x0B
0x0000
2 lower bits of coefficient 11
14
0x0C
0x0002
2 lower bits of coefficient 12
15
0x0D
0x0002
2 lower bits of coefficient 13
16
0x0E
0x0002
2 lower bits of coefficient 14
17
0x0F
0x0000
2 lower bits of unused coefficient RAM location
18
0x10
0x0000
2 lower bits of coefficient 15
19
0x11
0x0001
2 lower bits of coefficient 16
20
0x12
0x0001
2 lower bits of coefficient 17
21
0x13
0x0000
2 lower bits of coefficient 18
22
0x14
0x0000
2 lower bits of coefficient 19
23
0x15
0x0003
2 lower bits of coefficient 20
24
0x16
0x0001
2 lower bits of coefficient 21
25
0x17
0x0002
2 lower bits of coefficient 22
26
0x18
0x0002
2 lower bits of coefficient 23
27
0x19
0x0001
2 lower bits of coefficient 24
28
0x1A
0x0003
2 lower bits of coefficient 25
29
0x1B
0x0001
2 lower bits of coefficient 26
30
0x1C
0x0002
2 lower bits of coefficient 27
31
0x1D
0x0002
2 lower bits of coefficient 28
32
0x1E
0x0003
2 lower bits of coefficient 29
33
0x1F
0x0000
2 lower bits of unused coefficient RAM location
34
0x21
0x0420
Page register for DDC2 CFIR Coefficient RAMs 32-47 and 48-63, LSBs.
35
0x00
0x0003
2 lower bits of coefficient 30
36
0x01
0x0002
2 lower bits of coefficient 31
37
0x02
0x0002
2 lower bits of coefficient 32
38
0x03
0x0001
2 lower bits of coefficient 33
39
0x04
0x0003
2 lower bits of coefficient 34
40
0x05
0x0001
2 lower bits of coefficient 35
41
0x06
0x0002
2 lower bits of coefficient 36
42
0x07
0x0002
2 lower bits of coefficient 37
43
0x08
0x0001
2 lower bits of coefficient 38
44
0x09
0x0003
2 lower bits of coefficient 39
45
0x0A
0x0000
2 lower bits of coefficient 40
46
0x0B
0x0000
2 lower bits of coefficient 41
47
0x0C
0x0001
2 lower bits of coefficient 42
48
0x0D
0x0001
2 lower bits of coefficient 43
RECEIVE DIGITAL SIGNAL PROCESSING
31
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
32
Step
Address
a[5:0]
Data
d[15:0]
Description
49
0x0E
0x0000
2 lower bits of coefficient 44
50
0x0F
0x0000
2 lower bits of unused coefficient RAM location
51
0x10
0x0002
2 lower bits of coefficient 45
52
0x11
0x0002
2 lower bits of coefficient 46
53
0x12
0x0002
2 lower bits of coefficient 47
54
0x13
0x0000
2 lower bits of coefficient 48
55
0x14
0x0003
2 lower bits of coefficient 49
56
0x15
0x0001
2 lower bits of coefficient 50
57
0x16
0x0002
2 lower bits of coefficient 51
58
0x17
0x0000
2 lower bits of coefficient 52
59
0x18
0x0003
2 lower bits of coefficient 53
60
0x19
0x0001
2 lower bits of coefficient 54
61
0x1A
0x0002
2 lower bits of coefficient 55
62
0x1B
0x0000
2 lower bits of coefficient 56
63
0x1C
0x0000
2 lower bits of coefficient 57
64
0x1D
0x0001
2 lower bits of coefficient 58
65
0x1E
0x0002
2 lower bits of coefficient 59
66
0x1F
0x0000
2 lower bits of unused coefficient RAM location
67
0x21
0x0440
Page register for DDC2 PFIR Coefficient RAMs 0-15 and 16-31, MSBs.
68
0x00
0xFFFF
Upper 16 bits of coefficient 0
69
0x01
0x0000
Upper 16 bits of coefficient 1
70
0x02
0x0001
Upper 16 bits of coefficient 2
71
0x03
0xFFFE
Upper 16 bits of coefficient 3
72
0x04
0xFFFF
Upper 16 bits of coefficient 4
73
0x05
0x0005
Upper 16 bits of coefficient 5
74
0x06
0xFFFC
Upper 16 bits of coefficient 6
75
0x07
0xFFF9
Upper 16 bits of coefficient 7
76
0x08
0x000B
Upper 16 bits of coefficient 8
77
0x09
0x0000
Upper 16 bits of coefficient 9
78
0x0A
0xFFEA
Upper 16 bits of coefficient 10
79
0x0B
0x0018
Upper 16 bits of coefficient 11
80
0x0C
0x0014
Upper 16 bits of coefficient 12
81
0x0D
0xFFBD
Upper 16 bits of coefficient 13
82
0x0E
0x0009
Upper 16 bits of coefficient 14
83
0x0F
0x0000
Upper 16 bits of unused coefficient RAM location
84
0x10
0x0069
Upper 16 bits of coefficient 15
85
0x11
0xFFAD
Upper 16 bits of coefficient 16
86
0x12
0x0FFB0
Upper 16 bits of coefficient 17
87
0x13
0x0B0A
Upper 16 bits of coefficient 18
88
0x14
0xFF92
Upper 16 bits of coefficient 19
89
0x15
0xFF04
Upper 16 bits of coefficient 20
90
0x16
0x0255
Upper 16 bits of coefficient 21
91
0x17
0x0080
Upper 16 bits of coefficient 22
92
0x18
0xF9F6
Upper 16 bits of coefficient 23
93
0x19
0x01CD
Upper 16 bits of coefficient 24
94
0x1A
0x0CA7
Upper 16 bits of coefficient 25
95
0x1B
0xF783
Upper 16 bits of coefficient 26
96
0x1C
0xE564
Upper 16 bits of coefficient 27
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Step
Address
a[5:0]
Data
d[15:0]
Description
97
0x1D
0x215D
Upper 16 bits of coefficient 28
98
0x1E
0x7FFF
Upper 16 bits of coefficient 29
99
0x1F
0x0000
Upper 16 bits of unused coefficient RAM location
100
0x21
0x0460
Page register for DDC2 PFIR Coefficient RAMS 32-47 AND 48-63, MSBs.
101
0x00
0x7FFF
Upper 16 bits of coefficient 30
102
0x01
0x215D
Upper 16 bits of coefficient 31
103
0x02
0xE564
Upper 16 bits of coefficient 32
104
0x03
0xF783
Upper 16 bits of coefficient 33
105
0x04
0x0CA7
Upper 16 bits of coefficient 34
106
0x05
0x01CD
Upper 16 bits of coefficient 35
107
0x06
0xF9F6
Upper 16 bits of coefficient 36
108
0x07
0x0080
Upper 16 bits of coefficient 37
109
0x08
0x0255
Upper 16 bits of coefficient 38
110
0x09
0xFF04
Upper 16 bits of coefficient 39
111
0x0A
0xFF92
Upper 16 bits of coefficient 40
112
0x0B
0x00BA
Upper 16 bits of coefficient 41
113
0x0C
0xFFB0
Upper 16 bits of coefficient 42
114
0x0D
0xFFAD
Upper 16 bits of coefficient 43
115
0x0E
0x0069
Upper 16 bits of coefficient 44
116
0x0F
0x008D
Upper 16 bits of unused coefficient RAM location
117
0x10
0x0009
Upper 16 bits of coefficient 45
118
0x11
0xFFBD
Upper 16 bits of coefficient 46
119
0x12
0x0014
Upper 16 bits of coefficient 47
120
0x13
0x0018
Upper 16 bits of coefficient 48
121
0x14
0xFFEA
Upper 16 bits of coefficient 49
122
0x15
0x0000
Upper 16 bits of coefficient 50
123
0x16
0x000B
Upper 16 bits of coefficient 51
124
0x17
0xFFF9
Upper 16 bits of coefficient 52
125
0x18
0xFFFC
Upper 16 bits of coefficient 53
126
0x19
0x0005
Upper 16 bits of coefficient 54
127
0x1A
0xFFFF
Upper 16 bits of coefficient 55
128
0x1B
0xFFFE
Upper 16 bits of coefficient 56
129
0x1C
0x0001
Upper 16 bits of coefficient 57
130
0x1D
0x0000
Upper 16 bits of coefficient 58
131
0x1E
0xFFFF
Upper 16 bits of coefficient 59
132
0x1F
0x0000
Upper 16 bits of unused coefficient RAM location
133
0x21
0x0500
Page register for DDC2 control registers 0-31
134
0x00
0x8EE0
DDC2 FIR_MODE register; cdma_mode enabled, 60 tap PFIR, 58 tap CFIR
135
0x01
0x2000
DDC2 PFIR gain = sum(taps)x2^–18 and CFIR gain = sum(taps)x2^–19
RECEIVE DIGITAL SIGNAL PROCESSING
33
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
PROGRAMMING
VARIABLE
DESCRIPTION
crastarttap_pfir(4:0)
Number of DDC PFIR filter taps is 4x(crastartap+1)
For double length PFIR the number of taps is 8x(crastartap+1)
cdma_mode
When set, puts the CFIR & PFIR blocks in CDMA mode.
mpu_ram_read
What set, the PFIR and CFIR coefficient rams are readable via the MPU control interface.
The GC5018 signal path is not operational when this bit is set, it is intended for debug purposes only.
pfir_gain(2:0)
Sets the gain of the PFIR filter.
The range is from 2e–19 to 2e–12; “000”= 2e–19 and “111”= 2e–12
double_tap(1:0)
When set, puts two adjacent DDC (2k and 2k+1, k=0 to 2) in double length (from 64 to128 tap) UMTS
mode.
Set to “00” for normal mode.
In double tap mode, data out of the last PFIR ram in the main DDC (DDC0, DDC2, DDC4 or DDC6) is
sent to the adjacent secondary DDC (DDC1, DDC3, DDC5 or DDC7) PFIR as input thus forming a
128-tap delay line. Data received from the adjacent PFIR summers is added into the Main DDC’s PFIR
sum to form the final output.
When using double tap mode, set double_tap to “10” for the main DDC, and to “01” for the secondary
DDC.
When in double tap mode, the first half of the coefficients should be loaded into the main DDC (DDC0,
DDC2, DDC4 or DDC6), the remaining coefficients are loaded into the secondary DDC (DDC1, DDC3,
DDC5 or DDC7).
In double tap mode, the main DDC must be turned on (ddc_ena=1), and the secondary DDC must be
turned off (ddc_ena=0).
The PFIR filter’s 18 bit coefficients are loaded in four 16 word memories.
Note: PFIR filter coefficients are shared between A and B channels of a DDC block when in CDMA mode.
3.2.9
DDC RMS Power Meter
18
I
36
37
Q
18
55−bit
Integrator
36
clear
sync
RMS power
55−bit
Register
8−bit
sync delay
counter
8
delay
(in samples)
18−bit
interval
counter
8
interval
(in 1024 sample
increments)
transfer
18−bit
integration
counter
interrupt
16
integration
(in 4 sample
increments)
Figure 3-26. DDC RMS Power Meter Block Diagram
34
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
interrupt
interrupt
interrupt
sync
delay
integration time
integration time
interval time
sync
event
integration
start
integration time
interval time
integration
start
integration
start
Figure 3-27. DDC RMS Power Meter Timing
Each DDC channel includes an RMS power meter which is used to measure the total power within the
channel pass band.
The power meter samples the I and Q data stream after the PFIR filter. Both 18 bit I and Q data are
squared, summed, and then integrated over a period determined by a programmable counter. The
integration time is a 16 bit word which is programmed into the 18 bit counter.
There is a programmable 18 bit interval timer which sets the interval over which power measurements are
made. The timer counts in increments of 1024 samples. This allows the user to select intervals from 1 x
1024 samples up to 256 x 1024 samples. For UMTS systems with sample rate rate at 7.68 MHz, the
power meter interval range is from 133 µS to 34.1 mS. For a CDMA system with the sample rate at
2.4576 MHz, the power meter interval range is 417 µS to 107 mS.
The power measurement process starts with a sync event. The integration will start at sync event +3 chips
+ sync_delay. The 8 bit delay register permits delays from 1 to 256 samples after sync. The integration will
continue until the integration count is met. At that point, the result in the 55 bit accumulator is transferred
to the read holding register and an interrupt is generated indicating the power value is ready to read. The
interval counter continues until the programmed interval count is reached. When reached, the integration
counter and the interval counter start over again. Each time the integration count is reached, the 55 result
bits are again transferred to the read register overwriting the previous value and an interrupt is generated
signifying the data is ready to be read. Failure to read the data timely will result in overwriting the previous
interval measurement.
Sync starts the process. Whenever a sync is received, all the counters are reset to zero no matter what
the status.
For UMTS, I and Q are calculated and the integrated power is read. When in CDMA mode the power is
calculated for both the A ( Signal ) path and the B ( Diversity) signal. As a result, there are two 55-bit
words representing the Signal and Diversity when in CDMA mode.
The power read is:
power = [ (I2 + Q2) × (N × 4 + 1) ] where N is the integration count.
PROGRAMMING
VARIABLE
DESCRIPTION
pmeter_result_a(54:0)
55 bit UMTS or CDMA mode A channel power measurement result.
pmeter_result_b(54:0)
55 bit CDMA mode B channel power measurement result.
pmeter_sqr_sum_ddc(15:0)
Integration (square and sum) count in increments of four samples.
pmeter_sync_delay_ddc(7:0)
Sync delay count in samples.
pmeter_interval_ddc(7:0)
The measurement interval in increments of 2048 samples. This value must be greater than SQR_SUM.
ssel_pmeter(2:0)
Sync source selection.
pmeter_sync_disable
Turns off the sync to the channel power meter. This can be used to individually turn off syncs to a
channels power meter while still having syncs to other power meters on the chip.
RECEIVE DIGITAL SIGNAL PROCESSING
35
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
3.2.10
DDC AGC
I, Q
limit &
round
18
18
I, Q outputs (up to 25−bits in AGC bypass mode)
threshold zero mask
12 integer &
12 fractional
8
24
magnitude
8
4
compare
2
clear
Freeze
(from register bit
shift
29
accumulate
ocnt
ucnt
8
4
29
amin
16
limit
dzro dsat
4
2
under/over
detect
amax
16
dblw dabv
4
4
4
shift select
S=+/−1, D=4−bit shift
5
24
Freeze
(from sync source)
min limit
max limit
Gain
gain adjust
24
Figure 3-28. DDC AGC Block Diagram
The GC5018 automatic gain control circuit is shown above. The basic operation of the circuit is to multiply
the 18 bit input data from the PFIR by a 24-bit gain word that represents a gain or attenuation in the range
of 0 to 4096. The gain format is mixed integer and fraction. The 12-bit integer allows the gain to be
boosted by up to factor of 4096 (72 dB). The 12-bit fractional part allows the gain to be adjusted up or
down in steps of one part in 4096, or approximately 0.002 dB. If the integer portion is zero, then the circuit
attenuates the signal. The gain adjusted output data is saturated to full scale and then rounded to
between 4 and 18 bits in steps of one bit.
The AGC portion of the circuit is used to automatically adjust the gain so that the median magnitude of the
output data matches a target value, which is performed by comparing the magnitude of the output data
with a target threshold. If the magnitude is greater than the threshold, then the gain is decreased,
otherwise it is increased. The gain is adjusted as: G(t) = G + A(t), where G is the default, user supplied
gain value, and A(t) is the time varying adjustment. A(t) is updated as A(t) = A(t) + G(t)xSx2–D , where S=1
if the magnitude is less than the threshold and is –1 if the magnitude exceeds the threshold, and where D
sets the adjustment step size. Note that the adjustment is a fraction of the current gain. This is designed to
set the AGC noise level to a known and acceptable level while keeping the AGC convergence and
tracking rate constant, independent of the gain level. The AGC noise will be equal to ±2–D and the AGC
attack and decay rate will be exponential, with a time constant equal to 2–D. Hence, the AGC will increase
or decrease by 0.63 times G(t) in 2D updates.
If one assumes the data is random with a Gaussian distribution, which is valid for UMTS if more than 12
users with different codes have been overlaid, then the relationship between the RMS level and the
median is MEDIAN = 0.6745xRMS, hence the threshold should be set to 0.6745 times the desired RMS
level.
36
RECEIVE DIGITAL SIGNAL PROCESSING
www.ti.com
GC5018
8-CHANNEL WIDEBAND RECEIVER
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
The gain step size can be set using four different values of D, each of which is a 4 bit integer. D can range
from 3 to 18. The user can specify values of D for different situations, i.e., when the signal magnitude is
below the user-specified threshold (Dblw), is above the threshold (Dabv), is consistently equal to zero
(Dzro) or is consistently equal to maximum (Dsat). It is important to note that D represents a gain step
size. Smaller values of D represent larger gain steps. The definition of equal to zero is any number when
masked by zero_mask is considered to be zero. This permits consistently very small amplitude signals to
have their gain increased rapidly.
Separate programmable D values allow the user to set different attack and decay time constants, and to
set shorter time constants for when the signal falls too low (equal to zero), or is too high (saturates). The
magnitude is considered to be consistently equal to zero by using a 4-bit counter that counts up every
time the 8-bit magnitude value is zero, and counts down otherwise. If the counter’s value exceeds a user
specified threshold, then Dabv is used. Similarly the magnitude is considered too high by using a counter
that counts up when the magnitude is maximum, and counts down otherwise. If this counter exceeds
another user specified threshold, then Dsat is used.
As an example, if the AGC’s current gain at a particular moment in time is 5.123, and the magnitude of the
signal is greater than zero, but less than the user-programmed threshold. Step size Dblw will be used to
modify the gain for the next sample. This represents the AGC attack profile. If Dblw is set to a value of 5,
then the gain for the next sample will be 5.123 + 5.123 x 2–5 = 5.123 + 0.160 = 5.283. If the signal’s
magnitude is still less than the user-programmed threshold, then the gain for the next sample will be 5.283
+ 5.283 x 2–5 = 5.283 + 0.165 = 5.448. This continues until the signal’s magnitude exceeds the
user-programmed threshold. When the magnitude exceeds threshold (but is not saturated), then step size
Dabv is automatically employed as a size rather than Dblw.
The AGC converges linearly in dB with a step size of 40log(1+2-D) when the error is greater than 12 dB
(i.e. the gain is off by 12 dB or more). Within 6 dB the behavior is approximately a exponential decay with
a time constant of 2(D-0.5) samples.
The suggested value of D is 5 or 6 when the error is greater than 12dB (i.e., in the fast range detected by
consistently zero or saturated data). This gives a step size of 0.5 or 0.25 dB per sample.
The suggested value when the gain is off by less than 12 dB is D=10, giving a exponential time constant
for delay of around 724 samples (63% decay every 724 samples).
RECEIVE DIGITAL SIGNAL PROCESSING
37
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
AGC GAIN ERROR
7
D=3
6
D=4
D=5
5
D=6
D=7
D=8
D=9
4
D=10
3
D=11
D=12
2
D=13
D=14
D=3
1
D=18
D=15
D=16
D=17
D=18
0
1
10
100
1000
10000
100000
1000000
SAMPLES
Figure 3-29. AGC Gain Error Over Time vs. D
The AGC noise once the AGC has converged is a random error of amplitude ±2-D relative to the RMS
signal level. This means that the error level is –6xD dB below the signal RMS level. At D=10 (–60 dB) the
error is negligible. The plot above shows the AGC response for vales of D ranging from 3 to 18. Error dB
represents the distance the signal level is from the desired target threshold.
The AGC is also subject to user specified upper and lower adjustment limits. The AGC stops incrementing
the gain if the adjustment exceeds Amax. It stops decrementing the gain if the adjustment is less than
Amin.
The input data is received with a valid flag that is high when a valid sample is received. For complex data
the I and Q samples are on the same data input line and are not treated independently. An adjustment is
made for the magnitude of the I sample, and then another adjustment is made for the Q sample.
The AGC operates on UMTS and CDMA data. When in UMTS mode the I and Q data are each used to
produce the AGC level. There is no separate I path gain and Q path gain. When in CDMA mode there are
separate gain levels for the Signal and Diversity I and Q data. The I and Q for A (or the Signal ) pair is
calculated and then the I' and Q' for the B (or Diversity) pair is calculated.
There is a freeze mode for holding the accumulator at its current level. This will put the AGC in a hold
mode using the user-programmed gain along with the current gain_adjust value. To only use the user
programmed gain value as the gain, set the freeze bit and then clear the accumulator. When using the
freeze bit the full 25 bit output is sent out of the AGC block to support transferring up to 25 bits when the
AGC is disabled.
For TDD applications, freeze mode can be controlled using a sync source. This allows rxsync_a/b/c/d to
be assigned as a AGC hold signal to keep the AGC from responding during the transmit interval and run
during the receive interval. The freeze register bit is logically Ored with the freeze sync source.
The current AGC gain and state can also be optionally output with the DDCs I and Q output data by
setting the gain_mon variable. When in this mode, the top 14 bits of the current AGC gain word are
appended to the 8 bit AGC-modified I and Q output data.
38
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Output
Bits(17:10)
I
I output data
Q
Q output data
Bits(9:4)
Bits(3:2)
Bits(1:0)
Gain(23:16)
Gain(15:10)
“00”
AGC State(1:0)
“00”
PROGRAMMING
VARIABLE
DESCRIPTION
agc_dblw(3:0)
Below threshold gain. Sets the value of gain step size Dblw (data x current gain below threshold). Ranges from
3 to 18, and maps to a 4 bit field. For example: 3 = “0000”, 4= “0001”, … 18= “1111”
agc_dabv(3:0)
Above threshold gain. Sets the value of gain step size Dabv (data x current gain above threshold). Ranges
from 3 to 18, and maps to a 4 bit field. For example: 3 = “0000”, 4= “0001”, … 18= “1111”
agc_dzro(3:0)
Zero signal gain. Sets the value of gain step size Dzro (data x current gain consistently zero). Ranges from 3 to
18, and maps to a 4 bit field. For example: 3 = “0000”, 4= “0001”, … 18= “1111”
agc_dsat (3:0)
Saturated signal gain. Sets the value of gain step size Dsat (data x current gain consistently saturated).
Ranges from 3 to 18, and maps to a 4 bit field. For example: 3 = “0000”, 4= “0001”, … 18= “1111”
agc_zero_msk(3:0)
Masks the lower 4 bits of signal data so as to be considered zeros.
agc_md(3:0)
AGC rounding. 0000= 18 bits out, 1111= 3 bits out.
agc_thresh(7:0)
AGC threshold. Compared with magnitude of 8 bits of input x gain.
agc_rnd_disable
AGC rounding is disabled when this bit is set.
agc_freeze
The AGC gain adjustment updates are disable when set.
agc_clear
The AGC gain adjustment accumulator is cleared when set
agc_gaina(23:0)
24 bit gain word for DDC A
agc_gainb(23:0)
24 bit gain word for DDC B (in CDMA mode)
agc_zero_cnt(3:0)
When the AGC output (input x gain) is zero value this number of times, the shoft value is changed to
agc_dzero.
agc_max_cnt(3:0)
When the AGC output (input x gain) is zero value this number of times, the shift value is changed to agc_dsat.
agc_amax(15:0)
The maximum value that gain can be adjusted up to. Top 12 bits are integer, bottom 4 bits are fractional.
agc_amin(15:0)
The minimum value that gain can be adjusted down to. Top 12 bits are integer, bottom 4 bits are fractional.
gain_mon
When set, combines current AGC gain with I and Q data. The 18 bit output format thus becomes:
I Portion: 8 bits of AGC’d I data - Gain(23:16) - 00
Q Portion: 8 bits of AGC’d Q data - Gain(15:10) - Status(1:0) - 00.
Note: Bit 0 of Status, when set, indicates the data is saturated. Bit 1 of Status, when set, indicates the data is
zero.
ssel_agc_freeze(2:0)
Sync selection for freeze mode, 1 of 8 sources. This source is ORed with the freeze register bit
ssel_gain(2:0)
Sync selection for the double buffered agc_gaina and agc_gainb register.
ssel_ddc_agc(2:0)
Sync selection used to initialize the AGC, primarily for test purposes.
3.2.11
DDC Output Interface
The baseband I/Q sample interface can be configured as serial or parallel formatted data. The serial
interface closely matches the GC5316 style interface. The parallel interface is provided to interface directly
to the TMS320TCI110 when delayed antenna streams used to implement channel estimation buffering
and/or transport format combination indicator (TFCI) buffering are not required.
The DDC output data is 2’s complement format.
RECEIVE DIGITAL SIGNAL PROCESSING
39
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
3.2.11.1
Serial Output Interface
Serial Outputs
sync
4
clkdiv
frame
strobe
delay
DDC Block
1 UMTS mode channel or
2 CDMA mode channels
2
double length
PFIR UMTS
I msb
CDMA
UMTS
rxout_X_a
I ch A
I msb
rxout_X_b
I ch B
I msb−1
I msb−1
rxout_X_c
Q ch A
Q msb
I msb−2
rxout_X_d
Q ch B
Q msb−1
I msb−3
rx_sync_out_X
Q msb
four outputs from
adjacent DDC block
Q msb−1
Q msb−2
Q msb−3
Figure 3-30. Serial Output Block Diagram and Output Pins for Each DDC Filter Mode
Each DDC block can be assigned four serial output data pins. These pins are used to transfer
downconverted I/Q baseband data out of the GC5018 for subsequent processing. The usage of these pins
changes depending on how the DDC block is configured.
When the block is configured for two CDMA channels, a pair of serial data pins provides separate I and Q
data output for the two DDC channels. Word size is selectable from 4 to 25 bits with the most significant
bit first.
When the DDC block is configured for a single UMTS channel, even and odd I and Q data drive the four
serial pins separately, most significant bit first.
Four serial pins each for I and Q data can be optionally employed (instead of two for I and two for Q) at
half the output rate. This would most likely be used when two DDC channels (2k and 2k + 1, k= 0 to 5) are
combined to support double-length PFIR filtering (a channel is sacrificed). Formatting for I data is then:
Imsb, Imsb-1, Imsb-2, Imsb-3. Q data formatting is: Qmsb, Qmsb-1, Qmsb-2, Qmsb-3.
The frame strobe signal provided on the rx_sync_out_X pins can be programmed to arrive from 0 to 3 bit
clocks early via a 2 bit control parameter. The frame interval can be programmed from 1 to 63 bits. A
programmable 4-bit clock divider circuit is used to specify the serial bit rate. The clock divider circuit is
synchronized using a sync block discussed later in this document.
Programming the serial port clock divider requires some thought and depends upon the channel’s overall
decimation ratio, frame sync interval, number of output bits, and CDMA-UMTS mode.
In general:
the serial clock divide ratio × the frame sync interval = the total receive decimation
The relationship between the number of serial bits output, clock divide ratio, and overall decimation ratio
is:
CDMA: [overall decimation × (pser_recv_8pin + 1) ] / (pser_recv_clkdiv + 1) > pser_recv_bits + 1
UMTS: 2 × [overall decimation × (pser_recv_8pin + 1) ] / (pser_recv_clkdiv + 1) > pser_recv_bits + 1
where overall decimation = CIC DECIMATION × 2.
40
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Decimation by 2 in the output interface can be achieved by setting the frame strobe interval and clock
divider to 1/2 the PFIR output rate. The serial interface samples the PFIR output each time the transfer
interval defined by these two settings has completed. The decimation moment can be controlled using the
rxsync_X input signal selected as the sync source for the serial interface.
The timing diagram below shows the DDC serial output timing.
tsetup
tpd
thold
rxclk
rxsync_X
rxsync_X can be a pulse or level − interface will generate periodic frame strobes using programmed frame sync interval
rxsync_out_X
Programmed bit time
(2 rxclk cycles for this example)
3 rxclk + 1 Programmed bit time
MSB
rxout_X_Y
Figure 3-31. Serial Output Interface Timing Diagram
PROGRAMMING
VARIABLE
DESCRIPTION
pser_recv_fsinvl(6:0)
Frame sync interval in bits
pser_recv_bits(4:0)
Number of data output bits - 1. i.e.: 10001= 18 bits
pser_recv_clkdiv(3:0)
Receive serial interface clock divider rate – 1.
0= rcclk, 15= rxclk/16
pser_recv_8pin
When set, configures the serial out pins for 4I and 4Q in UMTS mode. When clear, the mode is 2I and
2Q. Used in conjunction with pser_recv_alt.
pser_recv_alt
When set, outputs Q data from adjacent DDC channel.
pser_recv_fsdel(1:0)
Number of bit clocks the frame sync is output early with respect to serial data.
ssel_serial(2:0)
Sync source selection, 1 of 8.
tristate(6:3)
Tristate controls for the rx_sync_out_X and rxout_X_X pins. Pins are in tristate when the tristate register
bits are set.
RECEIVE DIGITAL SIGNAL PROCESSING
41
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
3.2.11.2
Parallel Output Interface
DDC7
rx_sync_out_6
par_sync_out
DDC6
rxclk _out
rxclk _out
DDC5
rxout_7_d
rxout_7_c
rxout_7_b
I(15)
I(14)
I(13)
rxout_4_b
rxout_4_a
I(1)
I(0)
rxout_3_d
rxout_3_c
rxout_3_b
Q(15)
Q(14)
Q(13)
rxout_0_b
rxout_0_a
Q(1)
Q(0)
Output
format
DDC4
DDC3
DDC2
Parallel I/Q
DDC1
DDC0
Figure 3-32. Parallel Output Interface Block Diagram and Output Pins
When a parallel I/Q interface is required, a 32 bit time division multiplexed output mode can be selected
using the rxout_X_X pins. This interface is provided for direct connection to the TMS320TCI110 Receive
Chip Rate ASSP when delayed antenna streams are not required. The output sample rate, rxclk_out clock
polarity, par_sync_out position and number of channels to be output are all programmable.
rxclk_out
par_sync_out
Parallel I/Q
IQ DDC0
IQ DDC1
IQ DDC2
IQ DDC3
IQ DDC4
IQ DDC5
IQ DDC6
IQ DDC7
Figure 3-33. Parallel Output Interface Timing Diagram
The DDC channel serial interface synchronization source selections should all be programmed to the
same value when using this parallel output interface (each DDC channel ssel_serial(2:0) in the SYNC_0
register should be programmed to the same rxsync_A/B/C/D value).
Decimation by 2 in the output interface can be achieved by setting the frame strobe interval and clock
divider to 1/2 the PFIR output rate. The parallel interface samples the PFIR outputs each time the transfer
interval defined by these two settings has completed.
42
RECEIVE DIGITAL SIGNAL PROCESSING
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
PROGRAMMING
VARIABLE
DESCRIPTION
par_recv_fsinvl(6:0)
rx_sync_out (frame strobe) sync interval. 0 is 1 rxclk cycle and 127 is 128 rxclk cycles.
par_recv_clkdiv(6:0)
rxclk_out cycles per IQ channel sample; 1 is full rate, 2 is rxclk/2, etc.
par_recv_chan(3:0)
Number channels to be output. 0 is 1 channel, and 15 is 16 channels.
par_recv_sync_del(6:0)
Delays the DDC0 pser sync source to establish the timing of IQ DDC0. Increasing the value delays the
par_sync_out location.
par_recv_syncout_del(3:0)
Delays the rx_sync_out position with respect to IQ DDC0. Setting to 0 moves the rx_sync_out pulse one
rxclk_out cycle before the IQ DDC0 word, setting to 1 places it as shown above, lined up with IQ DDC0,
etc.
par_recv_rxclk_pol
rxclk_out polarity. Outputs data on falling edges when cleared, rising edges when set.
par_recv_sync_pol
Parallel interface par_sync_out polarity. 0 is active low, 1 for active high
par_recv_ena
Parallel TCI110 style interface enabled when set, serial interface enabled when cleared.
ssel_serial(2:0)
DDC channel serial interface sync source selection. All DDCs should be programmed to the same sync
source when using this parallel output interface.
gain_mon
When set, the parallel output data includes 8b I at I(15:8), 8b Q at Q(15:8), 14b AGC gain at I(7:0) and
Q(7:2) and 2b AGC state at Q(1:0).
tristate(6:3)
3-state controls for the rx_sync_out_X and rxout_X_X pins. Pins are in 3-state when the 3-state register
bits are set.
3.2.12
DDC Checksum Generator
The checksum generator is used in conjunction with the input test signal generator to implement a self test
capability.
sync
rxclk
rxout_X_a
rxout_X_b
rxout_X_c
rxout_X_d
checksum
generator
16
checksum read−only
results updated on
each sync event
results
register
initialized on sync event to “0000 0000 0000 0010”
15
14
1312
11
10
9
3
2 1
0
rxout_X_a
rxout_X_b
rxout_X_c
rxout_X_d
Figure 3-34. DDC Checksum Generator Block Diagram
The sync for the checksum generator is internally connected to the ddc_counter output.
PROGRAMMING
VARIABLE
ddc_chk_sum(15:0)
DESCRIPTION
Read only DDC channel checksum results
RECEIVE DIGITAL SIGNAL PROCESSING
43
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4
GC5018 GENERAL CONTROL
The GC5018 is configured over a bi-directional 16 bit parallel data microprocessor control port. The
control port permits access to the control registers which configure the chip. The control registers are
organized using a paged-access scheme using 6 address lines. Half of the 64 addresses (Address 32
through Address 63) represent global registers. The other 32 (Address 0 through Address 31) are paged
registers. This arrangement permits accessing a large number of control registers using relatively few
address lines.
Global registers (Address 32 through Address 63) are used to read/write GC5018 parameters that are
global in nature and can benefit from single read/write operations. Examples include chip status, reset,
sync options, checksum ramp parameters, interrupt sources, interrupt masks, 3-state controls and the
page register.
Global Address 33 is the page register. Writing a 16 bit value to this register sets the page to which future
write or read operations performed. These paged-registers contain the actual parameters that configure
the chip and are accessed by writing/reading address 0 through address 31.
The global 3-state register can be used to 3-state the output drivers on the GC5018, and also includes the
capability of disabling the chip’s internal rxclk.
PROGRAMMING
VARIABLE
DESCRIPTION
rxclk_ena
Enables the internal rxclk when set. When cleared, the GC5018 will ignore the rxclk input signal and
hold the internal clock low.
3-state(10:0)
Various output pins are forced into tristate mode when these bits are asserted. See the GBL_3-STATE
register description for pin groups to bit assignments.
arst_func
When asserted, the internal datapath is held reset. The control register programming is not affected.
4.1
Microprocessor Interface Control Data, Address, and Strobes
The microprocessor control bus consists of 16 bi-directional control data lines d[15:0], 6 address lines
a[5:0], a read enable line rd_n, a write enable line wr_n, and a chip enable line ce_n. These lines usually
interface to a microprocessor or DSP chip and is intended to look like a block of memory.
The interface can be operated in a 3 pin control mode (using rd_n, wr_n and ce_n) or 2 pin control mode
(using wr_n and ce_n with rd_n always low).
44
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.1.1
MPU Timing Diagrams
tREC
ce_n
wr_n
rd_n
tCSU
tHIZ
a[5:0]
tCDLY
d[15:0]
tCOH
valid data
Figure 4-1. Read Operation – 3 pin control mode
tREC
ce_n
wr_n
tCSU
tHIZ
a[5:0]
tCDLY
d[15:0]
tCOH
valid data
Figure 4-2. Read Operation – 2 pin control mode (rd_n tied low)
GC5018 GENERAL CONTROL
45
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
tREC
ce_n
tC
CSPW
wr_n
tCSU
rd_n
a[5:0]
t CHD
d[15:0]
valid data
t EWCSU
Figure 4-3. Write Operation – 3 pin control mode
tREC
ce_n
tC
CSPW
wr_n
tCSU
a[5:0]
t CHD
d[15:0]
valid data
t EWCSU
Figure 4-4. Write Operation – 2 pin control mode (rd_n tied low)
4.2
Synchronization Signals
Various function blocks within the GC5018 need to be synchronized in order to realize predictable results.
The GC5018 provides a flexible system where each function block that requires synchronization can be
independently synchronized from either device pins or from a software “one-shot”. The one-shot option is
setup and triggered through control registers. The four sync input pins, rxsync_a, rxsync_b, rxsync_c and
rxsync_d are qualified on the rxclk rising clock edge.
Table 4-1 shows the different sync modes available.
46
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Table 4-1. Different Sync Modes Available
SYNC SELECT CODE
RECEIVE SYNC SOURCE
000
rxsync_a
001
rxsync_b
010
rxsync_c
011
rxsync_d
100
ddc sync counter terminal count
101
ddc sync triggered by s/w oneshot (register bit)
110
0 (always off)
111
1 (always on)
Table 4-2 and Table 4-3 summarizes the blocks which have functions that can be synchronized using the
above eight sync source options.
Table 4-2. Receive Common Syncs
Sync Name
Purpose
sync_ddc_counter
Initializes the receive sync counter
sync_ddc
Initializes the receive ADC interface and clock generation circuits
sync_rxsync_out
selects sync signal to be output on the rx_sync_out pin.
sync_adc_fifo
Initializes the input and output pointers in the ADC fifo circuits.
sync_tst_decim
Initializes the testbus decimation counter.
sync_recv_pmeterX
Initializes the rxin power meters. {X = 0,1,2 or 3}
sync_ragc_interval_X
Initializes the rxin receive AGC timers. {X = 0,1,2 or 3}
sync_ragc_freeze_X
rxin receive AGC freeze mode control. {X = 0,1,2 or 3}
sync_ragc_clear_X
Initializes the receive AGC error accumulator. {X = 0,1,2 or 3}
Table 4-3. DDC Channel Syncs
Sync Name
Purpose
sync_ddc_tadj
Selects zero stuff moment in the tadj fine adjustment section.
sync_ddc_tadj_reg
Updates the tadj output pointer register delay in the tadj coarse adjustment section.
sync_ddc_nco
Resets the NCO accumulator.
sync_ddc_freq
Updates the NCO freq registers.
sync_ddc_phase
Updates the NCO phase register.
sync_ddc_dither
Initializes the NCO dither circuits.
sync_ddc_cic
Selects the CIC decimation moment.
sync_ddc_pmeter
Initializes the receive channel power meters.
sync_ddc_gain
Updates the DDC channel AGC gain registers
sync_ddc_agc
Initializes the AGC accumulator.
sync_ddc_agc_freeze
AGC freeze mode control.
sync_ddc_serial
Initializes the receive serial interface.
A 32-bit general purpose timer is included in the synchronization function. The timer loads the user
programmed terminal count on a sync event, and counts down to zero using rxclk. The width of the
terminal count pulse can also be programmed up to rxclk cycles. The timers output can be used as a sync
source for any other circuits requiring a sync if desired, and can also be routed to the rx_sync_out pin.
GC5018 GENERAL CONTROL
47
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
PROGRAMMING
VARIABLE
DESCRIPTION
ddc_counter(31:0)
32-bit programmable terminal count
ddc_counter_width(7:0)
8-bit programmable terminal count pulse width
ssel_ddc_counter(2:0)
Sync source selection for the ddc counter
ssel_rxsync_out(2:0)
Sync source selection for the rx_sync_out pin
tri-state(0)
When set, the interrupt and rx_sync_out pins are tri-stated.
rx_oneshot
Register bit used to generate the S/W oneshot signal for sync. This bit must be programmed from
cleared to set in order to generate a rising edge sync signal.
4.3
Interrupt Handling
When a GC5018 block sets an interrupt, the interrupt pin will go active if the interrupt source is
masked. The microprocessor should then read the interrupt register to determine the source of
interrupt. The microprocessor will then have to write the interrupt register to clear the interrupt pin and
interrupt source. The interrupt register and interrupt mask are located in the global registers section of
control registers.
not
the
the
the
The GC5018 has 16 interrupt sources; power meters in each of the eight DDC blocks, power meters in the
four receive input interface, and four rxin_X_ovr (adc overflow) input pins where X={a,b,c,d}.
PROGRAMMING
VARIABLE
DESCRIPTION
pmeterX_im(7:0)
Channel pmeter interrupt mask bits. Interrupt source is masked when set.
recv_pmeterX_im(3:0)
Receive input power meter interrupt masks.
rxin_X_ovr_im
ADC overflow input pin interrupt masks.
pmeterX(7:0)
Channel pmeter interrupt status.
recv_pmeterX(3:0)
Receive input power meter interrupt status.
rxin_X_ovr
ADC overflow input pin interrupt status.
intr_clr
When asserted, holds all interrupt status bits cleared. The interrupt pin will be inactive (always low) when this
bit is set. Intended for lab/debug use only
tri-state(0)
When set, the interrupt and rx_sync_out pins are tri-stated.
4.4
GC5018 Programming
The GC5018 includes over 3000 internal configuration registers and therefore implements a paged
addressing scheme. The register map includes a global control variables register address space that is
accessed directly when the a5 signal is high. This global control variables address space includes the
page register. All other registers are addressed using a combination of an address comprised of the
internal page register contents and the 6-bit external address; a5, a4, a3, a2, a1 and a0.
The page register is accessed when the 6-bit address a5:a0 is 0x21 (or binary “100001”).
48
Page Register
Contents in Hex
Address
Pin a5
don’t care
1
Global Control Variables 0x00 through 0x1F
0x0000
0
DDC0 PFIR taps 0 through 31 coefficient lsbs (1:0)
0x0020
0
DDC0 PFIR taps 32 through 63 coefficient lsbs (1:0)
0x0040
0
DDC0 PFIR taps 0 through 31 coefficient msbs (17:2)
0x0060
0
DDC0 PFIR taps 32 through 63 coefficient msbs (17:2)
0x0080
0
DDC0 CFIR taps 0 through 31 coefficient lsbs (1:0)
GC5018 GENERAL CONTROL
Registers Addressed With 5 Bit Address Space, Pins (a4:a0)
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Page Register
Contents in Hex
Address
Pin a5
Registers Addressed With 5 Bit Address Space, Pins (a4:a0)
0x00A0
0
DDC0 CFIR taps 32 through 63 coefficient lsbs (1:0)
0x00C0
0
DDC0 CFIR taps 0 through 31 coefficient msbs (17:2)
0x00E0
0
DDC0 CFIR taps 32 through 63 coefficient msbs (17:2)
0x0100
0
DDC0 Control Registers 0x00 through 0x1F
0x0120
0
DDC0 Control Registers 0x20 through 0x3F
0x0200
0
DDC1 PFIR taps 0 through 31 coefficient lsbs (1:0)
0x0220
0
DDC1 PFIR taps 32 through 63 coefficient lsbs (1:0)
0x0240
0
DDC1 PFIR taps 0 through 31 coefficient msbs (17:2)
0x0260
0
DDC1 PFIR taps 32 through 63 coefficient msbs (17:2)
0x0280
0
DDC1 CFIR taps 0 through 31 coefficient lsbs (1:0)
0x02A0
0
DDC1 CFIR taps 32 through 63 coefficient lsbs (1:0)
0x02C0
0
DDC1 CFIR taps 0 through 31 coefficient msbs (17:2)
0x02E0
0
DDC1 CFIR taps 32 through 63 coefficient msbs (17:2)
0x0300
0
DDC1 Control Registers 0x00 through 0x1F
0x0320
0
DDC1 Control Registers 0x20 through 0x3F
0x0400
0
DDC2 PFIR taps 0 through 31 coefficient lsbs (1:0)
0x0420
0
DDC2 PFIR taps 32 through 63 coefficient lsbs (1:0)
0x0440
0
DDC2 PFIR taps 0 through 31 coefficient msbs (17:2)
0x0460
0
DDC2 PFIR taps 32 through 63 coefficient msbs (17:2)
0x0480
0
DDC2 CFIR taps 0 through 31 coefficient lsbs (1:0)
0x04A0
0
DDC2 CFIR taps 32 through 63 coefficient lsbs (1:0)
0x04C0
0
DDC2 CFIR taps 0 through 31 coefficient msbs (17:2)
0x04E0
0
DDC2 CFIR taps 32 through 63 coefficient msbs (17:2)
0x0500
0
DDC2 Control Registers 0x00 through 0x1F
0x0520
0
DDC2 Control Registers 0x20 through 0x3F
0x0600
0
DDC3 PFIR taps 0 through 31 coefficient lsbs (1:0)
0x0620
0
DDC3 PFIR taps 32 through 63 coefficient lsbs (1:0)
0x0640
0
DDC3 PFIR taps 0 through 31 coefficient msbs (17:2)
0x0660
0
DDC3 PFIR taps 32 through 63 coefficient msbs (17:2)
0x0680
0
DDC3 CFIR taps 0 through 31 coefficient lsbs (1:0)
0x06A0
0
DDC3 CFIR taps 32 through 63 coefficient lsbs (1:0)
0x06C0
0
DDC3 CFIR taps 0 through 31 coefficient msbs (17:2)
0x06E0
0
DDC3 CFIR taps 32 through 63 coefficient msbs (17:2)
0x0700
0
DDC3 Control Registers 0x00 through 0x1F
0x0720
0
DDC3 Control Registers 0x20 through 0x3F
0x0800
0
DDC4 PFIR taps 0 through 31 coefficient lsbs (1:0)
0x0820
0
DDC4 PFIR taps 32 through 63 coefficient lsbs (1:0)
0x0840
0
DDC4 PFIR taps 0 through 31 coefficient msbs (17:2)
0x0860
0
DDC4 PFIR taps 32 through 63 coefficient msbs (17:2)
0x0880
0
DDC4 CFIR taps 0 through 31 coefficient lsbs (1:0)
0x08A0
0
DDC4 CFIR taps 32 through 63 coefficient lsbs (1:0)
0x08C0
0
DDC4 CFIR taps 0 through 31 coefficient msbs (17:2)
0x08E0
0
DDC4 CFIR taps 32 through 63 coefficient msbs (17:2)
GC5018 GENERAL CONTROL
49
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
50
Page Register
Contents in Hex
Address
Pin a5
Registers Addressed With 5 Bit Address Space, Pins (a4:a0)
0x0900
0
DDC4 Control Registers 0x00 through 0x1F
0x0920
0
DDC4 Control Registers 0x20 through 0x3F
0x0A00
0
DDC5 PFIR taps 0 through 31 coefficient lsbs (1:0)
0x0A20
0
DDC5 PFIR taps 32 through 63 coefficient lsbs (1:0)
0x0A40
0
DDC5 PFIR taps 0 through 31 coefficient msbs (17:2)
0x0A60
0
DDC5 PFIR taps 32 through 63 coefficient msbs (17:2)
0x0A80
0
DDC5 CFIR taps 0 through 31 coefficient lsbs (1:0)
0x0AA0
0
DDC5 CFIR taps 32 through 63 coefficient lsbs (1:0)
0x0AC0
0
DDC5 CFIR taps 0 through 31 coefficient msbs (17:2)
0x0AE0
0
DDC5 CFIR taps 32 through 63 coefficient msbs (17:2)
0x0B00
0
DDC5 Control Registers 0x00 through 0x1F
0x0B20
0
DDC5 Control Registers 0x20 through 0x3F
0x0C00
0
DDC6 PFIR taps 0 through 31 coefficient lsbs (1:0)
0x0C20
0
DDC6 PFIR taps 32 through 63 coefficient lsbs (1:0)
0x0C40
0
DDC6 PFIR taps 0 through 31 coefficient msbs (17:2)
0x0C60
0
DDC6 PFIR taps 32 through 63 coefficient msbs (17:2)
0x0C80
0
DDC6 CFIR taps 0 through 31 coefficient lsbs (1:0)
0x0CA0
0
DDC6 CFIR taps 32 through 63 coefficient lsbs (1:0)
0x0CC0
0
DDC6 CFIR taps 0 through 31 coefficient msbs (17:2)
0x0CE0
0
DDC6 CFIR taps 32 through 63 coefficient msbs (17:2)
0x0D00
0
DDC6 Control Registers 0x00 through 0x1F
0x0D20
0
DDC6 Control Registers 0x20 through 0x3F
0x0E00
0
DDC7 PFIR taps 0 through 31 coefficient lsbs (1:0)
0x0E20
0
DDC7 PFIR taps 32 through 63 coefficient lsbs (1:0)
0x0E40
0
DDC7 PFIR taps 0 through 31 coefficient msbs (17:2)
0x0E60
0
DDC7 PFIR taps 32 through 63 coefficient msbs (17:2)
0x0E80
0
DDC7 CFIR taps 0 through 31 coefficient lsbs (1:0)
0x0EA0
0
DDC7 CFIR taps 32 through 63 coefficient lsbs (1:0)
0x0EC0
0
DDC7 CFIR taps 0 through 31 coefficient msbs (17:2)
0x0EE0
0
DDC7 CFIR taps 32 through 63 coefficient msbs (17:2)
0x0F00
0
DDC7 Control Registers 0x00 through 0x1F
0x0F20
0
DDC7 Control Registers 0x20 through 0x3F
0x1000
0
Receive Input AGC0 Error RAM addresses 0 through 31
0x1020
0
Receive Input AGC0 Error RAM addresses 32 through 63
0x1040
0
Receive Input AGC0 DVGA RAM addresses 0 through 31
0x1080
0
Receive Input AGC0 Gain RAM addresses 0 through 31
0x10A0
0
Receive Input AGC0 Gain RAM addresses 32 through 63
0x1100
0
Receive Input AGC1 Error RAM addresses 0 through 31
0x1120
0
Receive Input AGC1 Error RAM addresses 32 through 63
0x1140
0
Receive Input AGC1 DVGA RAM addresses 0 through 31
0x1180
0
Receive Input AGC1 Gain RAM addresses 0 through 31
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Page Register
Contents in Hex
Address
Pin a5
0x11A0
0
Receive Input AGC1 Gain RAM addresses 32 through 63
0x1400
0
Receive Input AGC2 Error RAM addresses 0 through 31
0x1420
0
Receive Input AGC2 Error RAM addresses 32 through 63
0x1440
0
Receive Input AGC2 DVGA RAM addresses 0 through 31
0x1480
0
Receive Input AGC2 Gain RAM addresses 0 through 31
0x14A0
0
Receive Input AGC2 Gain RAM addresses 32 through 63
0x1500
0
Receive Input AGC3 Error RAM addresses 0 through 31
0x1520
0
Receive Input AGC3 Error RAM addresses 32 through 63
0x1540
0
Receive Input AGC3 DVGA RAM addresses 0 through 31
0x1580
0
Receive Input AGC3 Gain RAM addresses 0 through 31
0x15A0
0
Receive Input AGC3 Gain RAM addresses 32 through 63
0x1800
0
Receive Input Control Registers 0x00 through 0x1F
0x1820
0
Receive Input Control Registers 0x20 through 0x3F
0x1840
0
Receive Input AGC Control Registers 0x00 through 0x1F
0x1860
0
Receive Input AGC Control Registers 0x20 through 0x3F
4.4.1
Registers Addressed With 5 Bit Address Space, Pins (a4:a0)
Control Register Index
REGISTER NAME
Table 4-4. Control Register Index
SECTION
GBL_PAR_CONFIG0
Section 4.4.2.4
GBL_PAR_CONFIG1
Section 4.4.2.5
SECTION
GBL_TRISTATE
Section 4.4.2.6
AGC_AMAX
Section 4.4.5.23
NZ_PWR_MASK
Section 4.4.3.7
AGC_AMIN
Section 4.4.5.24
PAGE
Section 4.4.2.2
AGC_CONFIG1
Section 4.4.5.17
PHASE_OFFSETA
Section 4.4.5.13
AGC_CONFIG2
Section 4.4.5.18
PHASE_OFFSETB
Section 4.4.5.14
AGC_CONFIG3
Section 4.4.5.19
PHASEADD0A
Section 4.4.5.9
AGC_GAINA
Section 4.4.5.21
PHASEADD0B
Section 4.4.5.11
AGC_GAINB
Section 4.4.5.22
PHASEADD1A
Section 4.4.5.10
AGC_GAINMSB
Section 4.4.5.20
PHASEADD1B
Section 4.4.5.12
CIC_MODE1
Section 4.4.5.5
PMETER_RESULT_A_LSB
Section 4.4.5.32
CIC_MODE2
Section 4.4.5.6
PMETER_RESULT_A_MID
Section 4.4.5.33
CONFIG
Section 4.4.2.3
PMETER_RESULT_A_MSB
Section 4.4.5.34
CONFIG1
Section 4.4.5.15
PMETER_RESULT_B_LSB
Section 4.4.5.35
CONFIG2
Section 4.4.5.16
PMETER_RESULT_B_MID
Section 4.4.5.36
DDC_CHK_SUM
Section 4.4.5.31
PMETER_RESULT_B_MSB
Section 4.4.5.37
DDCCONFIG1
Section 4.4.5.27
Section 4.4.5.38
FIR_GAIN
Section 4.4.5.2
PMETER_RESULT_AB_UM
SB
FIR_MODE
Section 4.4.5.1
PSER_CONFIG1
Section 4.4.5.25
GBL_IMASK0
Section 4.4.2.8
PSER_CONFIG2
Section 4.4.5.26
GBL_INTERRUPT0
Section 4.4.2.9
RAGC_CONFIG0
Section 4.4.4.1
GBL_ONESHOT
Section 4.4.2.7
RAGC_CONFIG1
Section 4.4.4.2
REGISTER NAME
GC5018 GENERAL CONTROL
51
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Table 4-4. Control Register Index (continued)
REGISTER NAME
SECTION
RAGC3_ACCUM_LSB
Section 4.4.4.63
Section 4.4.4.3
RAGC3_ACCUM_MSB
Section 4.4.4.64
RAGC_CONFIG3
Section 4.4.4.4
RAGC3_CLIP_ERROR
Section 4.4.4.56
RAGC0_ACCUM_LSB
Section 4.4.4.57
RAGC3_CLIP_HITHRESH
Section 4.4.4.51
Section 4.4.4.58
RAGC3_CLIP_HITIMER
Section 4.4.4.53
RAGC0_CLIP_ERROR
Section 4.4.4.17
RAGC3_CLIP_LOTHRESH
Section 4.4.4.52
RAGC0_CLIP_HITHRESH
Section 4.4.4.12
RAGC3_CLIP_LOTIMER
Section 4.4.4.54
Section 4.4.4.14
RAGC3_CLIP_SAMPLES
Section 4.4.4.55
RAGC0_CLIP_LOTHRESH
Section 4.4.4.13
RAGC3_CONFIG0
Section 4.4.4.46
RAGC0_CLIP_LOTIMER
Section 4.4.4.15
RAGC3_CONFIG1
Section 4.4.4.47
Section 4.4.4.16
RAGC3_INTEGINVL_LSB
Section 4.4.4.44
Section 4.4.4.7
RAGC3_INTEGINVL_MSB
Section 4.4.4.45
RAGC0_CONFIG1
Section 4.4.4.8
RAGC3_SD_SAMPLES
Section 4.4.4.50
RAGC0_INTEGINVL_LSB
Section 4.4.4.5
RAGC3_SD_THRESH
Section 4.4.4.48
Section 4.4.4.6
RAGC3_SD_TIMER
Section 4.4.4.49
RAGC0_SD_SAMPLES
Section 4.4.4.11
RECV_CONFIG0
Section 4.4.3.5
RAGC0_SD_THRESH
Section 4.4.4.9
RECV_CONFIG1
Section 4.4.3.6
Section 4.4.4.10
RECV_PMETER_SYNC
Section 4.4.3.8
RAGC1_ACCUM_LSB
Section 4.4.4.59
RECV_PMETER0_CONFIG
Section 4.4.3.12
RAGC1_ACCUM_MSB
Section 4.4.4.60
RECV_PMETER0_LMSB
Section 4.4.3.28
Section 4.4.4.30
RECV_PMETER0_LSB
Section 4.4.3.26
Section 4.4.4.25
RECV_PMETER0_MID
Section 4.4.3.27
RAGC1_CLIP_HITIMER
Section 4.4.4.27
RECV_PMETER0_SQR_SU
M_LSB
Section 4.4.3.9
RAGC1_CLIP_LOTHRESH
Section 4.4.4.26
Section 4.4.4.28
RECV_PMETER0_STRT_IN
TVL_LSB
Section 4.4.3.10
RAGC1_CLIP_LOTIMER
RAGC1_CLIP_SAMPLES
Section 4.4.4.29
Section 4.4.4.20
RECV_PMETER0_SYNC_D
LY
Section 4.4.3.11
RAGC1_CONFIG0
RAGC1_CONFIG1
Section 4.4.4.21
RECV_PMETER0_UMSB
Section 4.4.3.29
RAGC1_INTEGINVL_LSB
Section 4.4.4.18
RECV_PMETER1_CONFIG
Section 4.4.3.16
RAGC1_INTEGINVL_MSB
Section 4.4.4.19
RECV_PMETER1_LMSB
Section 4.4.3.32
Section 4.4.4.24
RECV_PMETER1_LSB
Section 4.4.3.30
RAGC1_SD_THRESH
Section 4.4.4.22
RECV_PMETER1_MID
Section 4.4.3.31
RAGC1_SD_TIMER
Section 4.4.4.23
Section 4.4.3.13
RAGC2_ACCUM_LSB
Section 4.4.4.61
RECV_PMETER1_SQR_SU
M_LSB
Section 4.4.4.62
RECV_PMETER1_STRT_IN
TVL_LSB
Section 4.4.3.14
RAGC2_ACCUM_MSB
RAGC2_CLIP_ERROR
Section 4.4.4.43
Section 4.4.4.38
RECV_PMETER1_SYNC_D
LY
Section 4.4.3.15
RAGC2_CLIP_HITHRESH
RAGC2_CLIP_HITIMER
Section 4.4.4.40
RECV_PMETER1_UMSB
Section 4.4.3.33
RAGC2_CLIP_LOTHRESH
Section 4.4.4.39
RECV_PMETER2_CONFIG
Section 4.4.3.20
RAGC2_CLIP_LOTIMER
Section 4.4.4.41
RECV_PMETER2_LMSB
Section 4.4.3.36
Section 4.4.4.42
RECV_PMETER2_LSB
Section 4.4.3.34
RAGC2_CONFIG0
Section 4.4.4.33
RECV_PMETER2_MID
Section 4.4.3.35
RAGC2_CONFIG1
Section 4.4.4.34
Section 4.4.3.17
RAGC2_INTEGINVL_LSB
Section 4.4.4.31
RECV_PMETER2_SQR_SU
M_LSB
RAGC2_INTEGINVL_MSB
Section 4.4.4.32
RECV_PMETER2_STRT_IN
TVL_LSB
Section 4.4.3.18
RAGC2_SD_SAMPLES
Section 4.4.4.37
Section 4.4.4.35
RECV_PMETER2_SYNC_D
LY
Section 4.4.3.19
RAGC2_SD_THRESH
RAGC2_SD_TIMER
Section 4.4.4.36
RECV_PMETER2_UMSB
Section 4.4.3.37
REGISTER NAME
RAGC_CONFIG2
RAGC0_ACCUM_MSB
RAGC0_CLIP_HITIMER
RAGC0_CLIP_SAMPLES
RAGC0_CONFIG0
RAGC0_INTEGINVL_MSB
RAGC0_SD_TIMER
RAGC1_CLIP_ERROR
RAGC1_CLIP_HITHRESH
RAGC1_SD_SAMPLES
RAGC2_CLIP_SAMPLES
52
GC5018 GENERAL CONTROL
SECTION
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Table 4-4. Control Register Index (continued)
REGISTER NAME
SECTION
SSEL_DDC_CNTR
Section 4.4.3.3
Section 4.4.3.24
SSEL_RX_0
Section 4.4.3.4
RECV_PMETER3_LMSB
Section 4.4.3.40
STRT_INTRVL
Section 4.4.5.4
RECV_PMETER3_LSB
Section 4.4.3.38
SYNC_0
Section 4.4.5.28
Section 4.4.3.39
SYNC_1
Section 4.4.5.29
RECV_PMETER3_SQR_SU
M_LSB
Section 4.4.3.21
SYNC_2
Section 4.4.5.30
SYNC_DDC_CNTR_LSB
Section 4.4.3.1
RECV_PMETER3_STRT_IN
TVL_LSB
Section 4.4.3.22
SYNC_DDC_CNTR_MSB
Section 4.4.3.2
TADJC
Section 4.4.5.7
RECV_PMETER3_SYNC_D
LY
Section 4.4.3.23
TADJF
Section 4.4.5.8
VER
Section 4.4.2.1
REGISTER NAME
RECV_PMETER3_CONFIG
RECV_PMETER3_MID
SECTION
RECV_PMETER3_UMSB
Section 4.4.3.41
RECV_SLF_TST_VALUE
Section 4.4.3.25
SQR_SUM
Section 4.4.5.3
GC5018 GENERAL CONTROL
53
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.2
Global Control Variables
These registers are accessed directly without page address extension; when pin a5 is high during a read
or write access, this block of 32 registers are accessed.
4.4.2.1
VER Register
Register name: VER
54
Address: 0x20
READ_ONLY
BIT 15
unused
unused
unused
unused
unused
unused
unused
BIT 8
unused
0
0
0
0
0
0
0
0
BIT 7
unused
unused
unused
unused
VER3
VER2
VER1
BIT 0
VER0
0
0
0
0
0
0
*
*
VER(3:0):
A hardwired read only register that
* valid version codes are "0001" and "0010"
GC5018 GENERAL CONTROL
returns
the
version
of
the
chip.
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.2.2
PAGE Register
Register name: PAGE
Address: 0x21
BIT 15
unused
unused
unused
0
0
0
0
0
BIT 7
Y(1)
Y(0)
Zp
unused
0
0
0
0
W(2:0) :
Selects which dual DDC block to address.
X:
The DDC modules are configured as dual DDCs; an even numbered DDC and odd
numbered DDC are contained in each dual DDC module, the X bit selects which DDC gets
address. (DDC0/2/4/6=0, DDC1/3/5/7=1)
Y(2:0) :
X
BIT 8
Y(2)
0
0
0
unused
unused
unused
BIT 0
unused
0
0
0
0
W(2:0)
W(2:0)
X bit
Selected Block
000
0
DDC0
000
1
DDC1
001
0
DDC2
001
1
DDC3
010
0
DDC4
010
1
DDC5
011
0
DDC6
011
1
DDC7
100
0
Receive AGC0/1 RAMs
101
0
Receive AGC2/3 RAMs
110
0
Receive Input Interface
Within each major block, there are up to 8 different Zones that can be addressed using the Y
bits.
Y(2:0)
DDC Zone
Receive Input Interface Zone
Receive AGC RAMs Zone
000
PFIR coeffient lower 2 bits
CHIPS control registers
RAGC0/2 ERRMAP
001
PFIR coeffient upper 16 bits
RAGC control registers
RAGC0/2 DVGAMAP
010
CFIR coeffient lower 2 bits
Not assigned
RAGC0/2 GAINMAP
011
CFIR coeffient upper 16 bits
Not assigned
Not assigned
100
Control registers
Not assigned
RAGC1/3 ERRMAP
101
Not assigned
Not assigned
RAGC1/3 DVGAMAP
110
Not assigned
Not assigned
RAGC1/3 GAINMAP
111
Not assigned
Not assigned
Not assigned
Zp :
The Zp bit is the MSB of the address word sent to the registers and rams. This bit can be
thought of as an upper/lower selector of the 64 word addressing.
GC5018 GENERAL CONTROL
55
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.2.3
CONFIG Register
Register name: CONFIG
Address: 0x22
BIT 15
slf_ tst_ena
rduz_sens_ena
arst_ func
BIT 8
0
0
0
BIT 7
par_recv_ena
gbl_ ddc_write
intr_ clr
0
0
0
tst_rate_sel(4:0)
0
0
0
0
BIT 0
tst_ on
tst_select(3:0)
1
1
0
1
0
0
slf_tst_ena : Turns on the checksum LFSR for the receivers. They are located in the RECEIVE INPUT
INTERFACE and DDC blocks
rduz_sens_ena : When enabled, adds noise to the LSB’s of the ADC inputs.
arst_func : When asserted, resets the functional portion of the circuits. The MPU registers do not get
reset and retain their programmed value
tst_rate_sel(4:0) : Sets the rate of the output test data and clock. The length of the clock cycle is the
value in tst_rate_sel+1 multiplied by the RXCLK period.
par_recv_ena : When asserted, the rxout_*_* serial pins join to form a 32 bit parallel output using 32 pins
as a data bus, one pin as a output clock and one pin as a sync. This is used to connect to
the TCI110 Chip rate processor from TI.
gbl_ddc_write : When asserted, the mpu writes are global. This means that DDC0/2/4/6 or DDC1/3/5/7
can be programmed simultaneously with the same values. This is an effort to reduce the
amount of time spent programming the device. A common setup can be used to program the
DDC0/2/4/6, then all the DDC1/3/5/7. Afterwards, just individual writes to the registers which
differ between DDCs can be done. To use this feature, this bit must be asserted and the
DDC0/1 must be addressed. Any other DDC address will not work.
intr_clr :
When asserted, this bit forces all interrupts to be cleared. To allow the interrupts to be set
again, this bit must be programmed to zero. This does not stop blocks from generating
interrupts, but rather just keeps the interrupts from being reported.
tst_select(3:0) : This selects which block the test output comes from:
tst_on :
56
tst_select(3:0)
Test Data Sent to Output
0000
DDC 0
0001
DDC 1
0010
DDC 2
0011
DDC 3
0100
DDC 4
0101
DDC 5
0110
DDC 6
0111
DDC 7
1000
rxin_a and rxin_b FIFO outputs
others
none selected
When asserted, the testbus is active. The ADC input ports rxin_c(15:0), rxin_d(15:0),
dvga_c(5:0) and dvga_d(5:0) become the testbus output ports. When this bit is set, the
rxin_c(15:0) and rxin_d(15:0) ports become chip outputs. The dvga_c(5:0) and dvga_d(5:0)
ports are enabled separately using the GBL_TRISTATE register
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.2.4
GBL_PAR_CONFIG0 Register
Register name: GBL_PAR_CONFIG0
Address: 0x23
BIT 15
BIT 8
tst_clk_pol
par_recv_sync_del(6:0)
0
0
0
0
0
0
0
BIT 7
BIT 0
par_recv_
rxclk_pol
par_recv_clkdiv(6:0)
0
0
0
0
0
0
0
0
0
par_recv_sync_del(6:0) : Delays the sync source from the DDC0 AGC output by (par_recv_sync_del+1)
rxclk cycles.
tst_clk_pol : Selects the polarity of the test clock output at dvga_c(1) when the test bus is enabled; 0 for
rising edge in the center of valid data, 1 for falling edge in the center of valid data. No effect
when tst_rate_sel is “00000”.
par_recv_clkdiv(6:0) : Selects the parallel interface output clock rate.
par_recv_rxclk_pol : Selects the polarity of the rxclk_out clock output; 0 for rising edge in the center of
valid data, 1 for falling edge in the center of valid data.
4.4.2.5
GBL_PAR_CONFIG1 Register
Register name: GBL_PAR_CONFIG1
Address: 0x24
BIT 15
BIT 8
par_recv_syncout_del(3:0)
0
0
0
par_recv_chan(3:0)
0
0
0
0
BIT 7
BIT 0
par_recv_
sync_pol
par_recv_fsinvl(6:0)
0
0
0
0
0
0
0
0
0
par_recv_syncout_del(3:0) : Changes the rx_sync_out position with respect to IQ DDC0. Setting to 0
causes rx_sync_out to lead IQ DDC0 by 1 output sample, setting to 1 causes rx_sync_out to
line up with IQ DDC0, setting to 2 causes rx_sync_out to trail IQ DDC0 by 1 output sample,
etc.
par_recv_chan(3:0) : Selects the number of channels to be output over the parallel interface, from 1 to 16
channels.
par_recv_fsinvl(6:0) : Selects the number of rxclk cycles per parallel interface frame, from 1 to 128
cycles.
par_recv_sync_pol : Selects the polarity of the parallel interface sync pulse; 0 for active low, 1 for active
high.
GC5018 GENERAL CONTROL
57
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.2.6
GBL_TRISTATE Register
Register name: GBL_TRISTATE
Address: 0x25
BIT 15
rxclk_ena
unused
unused
unused
unused
tristate(10)
tristate(9)
BIT 8
tristate(8)
1
0
0
0
0
1
1
1
BIT 7
tristate(7)
tristate(6)
tristate(5)
tristate(4)
tristate(3)
tristate(2)
tristate(1)
1
1
1
1
1
1
1
BIT 0
1
rxclk_ena : Master rxclk enable. When set, the chip’s rxclk is enabled, when cleared, rxclk is disabled.
All tristates are ACTIVE LOW so a ‘0’ turns on the output and a ‘1’ tristates it.
tristate(10) : This bit turns on the dvga_d outputs.
tristate(9) : This bit turns on the dvga_c outputs.
tristate(8) : This bit turns on the dvga_b outputs.
tristate(7) : This bit turns on the dvga_a outputs.
tristate(6) : This bit turns on the rx_sync_out_6/7, and the rxout_6/7_a/b/c/d outputs.
tristate(5) : This bit turns on the rx_sync_out_4/5, and the rxout_4/5_a/b/c/d outputs.
tristate(4) : This bit turns on the rx_sync_out_2/3, and the rxout_2/3_a/b/c/d outputs.
tristate(3) : This bit turns on the rx_sync_out_0/1, and the rxout_0/1_a/b/c/d outputs.
tristate(2) : unused
tristate(1) : rxclk_out
tristate(0) : interrupt, and rx_sync_out.
4.4.2.7
GBL_ONESHOT Register
Register name: GBL_ONESHOT
Address: 0x26
BIT 15
unused
unused
unused
unused
unused
unused
unused
BIT 8
unused
0
0
0
0
0
0
0
0
BIT 7
rx_oneshot
unused
unused
unused
unused
unused
unused
BIT 0
unused
0
0
0
0
0
0
0
0
rx_oneshot : When set, a one shot pulse is sent to the receive blocks for syncing. This only works if the
blocks are programmed to use the oneshot as the sync source. To use the oneshot again, it
must be programmed back to a ‘0’ and then back to a ‘1’.
58
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.2.8
GBL_IMASK0 Register
Register name: GBL_IMASK0
Address: 0x27
BIT 15
pmeter7_im
pmeter6_im
pmeter5_im
pmeter4_im
pmeter3_im
pmeter2_im
pmeter1_im
BIT 8
pmeter0_im
0
0
0
0
0
0
0
0
BIT 7
recv_
pmeter0_im
recv_
pmeter1_im
recv_
pmeter2_im
recv_
pmeter3_im
rxin_a_ ovr_im
rxin_b_ ovr_im
rxin_c_ ovr_im
BIT 0
rxin_d_ ovr_im
0
0
0
0
0
0
0
0
pmeterX_im : When asserted, masks the interrupt for the particular DDC pmeter, X= {0,1,2,3,4,5,6,7}.
recv_pmeterX_im : When asserted, masks the interrupt for the particular receive input pmeter, X=
{0,1,2,3 }.
rxin_X_ovr_im : When asserted, masks the interrupt for the particular rxin overflow, X={a,b,c,d}.
4.4.2.9
GBL_INTERRUPT0 Register
Register name: GBL_INTERRUPT0
Address: 0x29
BIT 15
pmeter7
pmeter6
pmeter5
pmeter4
pmeter3
pmeter2
pmeter1
BIT 8
pmeter0
0
0
0
0
0
0
0
0
BIT 7
recv_ pmeter0
recv_ pmeter1
recv_ pmeter2
recv_ pmeter3
rxin_a_ovr
rxin_b_ovr
rcin_c_ovr
BIT 0
rxin_d_ovr
0
0
0
0
0
0
0
0
pmeterX :
Asserted when an interrupt has been generated by this DDC pmeterX block, X={1,2,3,4,5,6,7
recv_pmeterX : Asserted when an interrupt has been generated by this receive input pmeter, X= {0,1,2,3
}.
rxin_X_ovr : Asserted when a logic high input from the rxin_X_ovr pin occurs, X={a,b,c,d}.
GC5018 GENERAL CONTROL
59
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3
Receive Input Interface Controls
4.4.3.1
SYNC_DDC_CNTR_LSB Register
Register name: SYNC_DDC_CNTR_LSB
Page: 0x1800
Address: 0x00
BIT 15
BIT 8
ddc_counter(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
ddc_counter(7:0)
0
4.4.3.2
0
0
0
0
0
0
0
SYNC_DDC_CNTR_MSB
Register name: SYNC_DDC_CNTR_MSB
Page: 0x1800
Address: 0x01
BIT 15
BIT 8
ddc_counter(31:24)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
ddc_counter(23:16)
0
0
0
0
0
0
0
0
ddc_counter(32:0) : 32 bit interval timer common to all DDC sync inputs. This timer may be programmed
to any interval count, and each DDC synchronization input can select this counter as a
source. The value programmed into the counter is: (desired number –1). The counter
increments on each RX clock rising edge.
60
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.3
SSEL_DDC_CNTR Register
Register name: SSEL_DDC_CNTR
Page: 0x1800
BIT 15
rxinab_mux
rxincd_mux
unused
unused
unused
0
0
0
0
0
Address: 0x02
BIT 8
ssel_ddc_counter(2:0)
0
0
BIT 7
0
BIT 0
ddc_counter_width(7:0)
0
0
0
0
0
0
0
0
rxinab_mux : When asserted, the rxin_a and rxin_b inputs are internally driven by the rxin_c and rxin_d
ports, respectively (Factory test use only).
rxincd_mux : When asserted, the rxin_c and rxin_d inputs are internally driven by the rxin_a and rxin_b
ports, respectively (Factory test use only).
ssel_ddc_counter(2:0) : Selects the sync source for the DDC sync counter.
ddc_counter_width(7:0) : Sets the width of the counter generated sync pulse in RX clock cycles, from 1
to 256.
Sync sources are contained in this and many of the following registers. For all sync source selections:
ssel_ddc_XXXXX(2:0)
Selected Sync Source
000
rxsyncA
001
rxsyncB
010
rxsyncC
011
rxsyncD
100
DDC sync counter
101
one shot (register write triggered)
110
always 0
111
always 1
GC5018 GENERAL CONTROL
61
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.4
SSEL_RX_0 Register
Register name: SSEL_RX_0
BIT 15
unused
0
Address: 0x03
BIT 8
ssel_adc_fifo(2:0)
0
BIT 7
unused
0
Page: 0x1800
0
unused
0
0
ssel_tst_decim(2:0)
0
0
0
BIT 0
ssel_rxsync_out(2:0)
0
0
unused
0
0
ssel_ddc(2:0)
0
0
0
ssel_adc_fifo(2:0) : Selects the sync source for the adc FIFO blocks. Sync reinitializes the read and write
pointers of the FIFO.
ssel_tst_decim(2:0) : Selects the sync source for the test bus decimator block.
ssel_rxsync_out(2:0) : Selects the sync source for the RXSYNC_OUT pin.
ssel_ddc(2:0) : Selects the sync source for the DDC data input mux and mixer. Controls clock generation
in each DDC block (before the CIC input) which must match because the FIFO output clock
is common for all DDC blocks.
62
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.5
RECV_CONFIG0 Register
Register name: RECV_CONFIG0
BIT 15
rate_sel(1:0)
0
0
Page: 0x1800
Address: 0x04
adc_
fifo_strap_cd
self_test_
const_ena
adc_
fifo_bypass
ragc_mpu_ram
_read
0
0
0
0
0
0
pmeter3_iq
pmeter2_iq
pmeter1_iq
BIT 0
pmeter0_iq
0
0
0
0
BIT 7
tst_decim_delay(3:0)
0
0
BIT 8
tst_ decim17
adc_
fifo_strap_ab
0
0
rate_sel(1:0) : Tells the RECV_CDRV the input rate. This is the rxin_a/b/c/d input rate and the rate that
the RECEIVE INPUT INTERFACE block sends data to the DDCs.
rate_sel
Input clock rate
00
rxclk
01
rxclk/2
10
rxclk/4
11
rxclk/8
adc_fifo_strap_ab : When asserted, the input pointers of the rxin_a FIFO and rxin_b FIFO are hooked
together in lock step configuration. This is used for maintaining FIFO delay consistency when
complex inputs are driven on rxin_a(I) and rxin_b(Q). rxin_a is the Master.
adc_fifo_strap_cd : When asserted, the input pointers of the rxin_c FIFO and rxin_d FIFO are hooked
together in lock step configuration. This is used for maintaining FIFO delay consistency when
complex inputs are driven on rxin_c(I) and rxin_d(Q). rxin_c is the Master.
self_test_const_ena : When asserted, (with slf_tst_ena also asserted), a constant value is output by the
test and noise generator instead of the pseudo random sequence. The constant value is
programmable.
adc_fifo_bypass : When asserted, the ADC FIFO circuits are bypassed. Input data is then clocked in
directly using the rxclk input. The ssel_ddc selection value will control the location of the
internally generated sample clock when this bit is asserted where rate_sel is rxclk/2, rxclk/4
or rxclk/8.
ragc_mpu_ram_read : When asserted, the RAMs in the RAGC blocks can be read. This bit should only
be set when reading the RAGC map rams via the mpu interface and must be cleared for
proper RAGC operation.
tst_decim17 : When set, the decimation factor of the tst_decimator block is 17X. When cleared, the
decimation factor is 1X (no decimation).
tst_decim_delay(3:0) : These bits set the delay from the sync occurring until the decimator samples. In
other words, the moment of the decimator is set by this delay value.
pmeter3_iq : When asserted, the pmeter3 block takes input from both rxin_c and rxin_d as a complex
sample pair. When de-asserted, only input from rxin_d is used for the power measurement.
pmeter2_iq : When asserted, the pmeter2 block takes input from both rxin_c and rxin_d as a complex
sample pair. When de-asserted, only input from rxin_c is used for the power measurement.
pmeter1_iq : When asserted, the pmeter1 block takes input from both rxin_a and rxin_b as a complex
sample pair. When de-asserted, only input from rxin_b is used for the power measurement.
pmeter0_iq : When asserted, the pmeter0 block takes input from both rxin_a and rxin_b as a complex
sample pair. When de-asserted, only input from rxin_a is used for the power measurement.
GC5018 GENERAL CONTROL
63
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.6
RECV_CONFIG1 Register
Register name: RECV_CONFIG1
Page: 0x1800
Address: 0x05
BIT 15
msb_pos_d(2:0)
0
0
offset_bin_d
0
0
BIT 8
offset_bin_c
msb_pos_c(2:0)
0
0
0
BIT 7
msb_pos_b(2:0)
0
0
offset_bin_b
0
0
BIT 0
offset_bin_a
msb_pos_a(2:0)
0
0
0
0
0
msb_pos_X(2:0) : Places the MSB of the input word from the ADC. The value programmed into the 3 bits
is the number of bit positions to the left of bit16 in the input word, that the MSB is located.
For example, if a 14bit input word is driving rxin_a input and is aligned with rxin_a_0, then
msb_pos_a is programmed to “010” meaning 2 bits shifted down from bit 16 is the MSB.
X={a,b,c,d}.
offset_bin_X : rxin_X input data is in offset binary and not twos complement. If set, the input value will be
converted to 2s complement using the MSB from the corresponding msb_pos_X value.
X={a,b,c,d}
4.4.3.7
NZ_PWR_MASK Register
Register name: NZ_PWR_MASK
Page: 0x1800
Address: 0x06
BIT 15
BIT 8
nz_pwr_mask (15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
nz_pwr_mask (7:0)
0
0
0
0
0
0
0
0
nz_pwr_mask(15:0) : Used with the rduz_sens_ena and selects the noise bits to be added to the ADC
input sample when asserted.
64
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.8
RECV_PMETER_SYNC Register
Register name: RECV_PMETER_SYNC
Page: 0x1800
BIT 15
recv_pmeter0_
ena
recv_pmeter1_
ena
0
BIT 8
ssel_recv_pmeter0(2:0)
0
BIT 7
recv_pmeter2_
ena
0
Address: 0x07
0
0
0
ssel_ recv_pmeter1(2:0)
0
0
0
BIT 0
ssel_ recv_pmeter2(2:0)
0
0
recv_pmeter3_
ena
0
0
ssel_ recv_pmeter3(2:0)
0
0
0
recv_pmeter0_ena : Enables the Receive Input Interface pmeter0 block when set
recv_pmeter1_ena : Enables the Receive Input Interface pmeter1 block when set
recv_pmeter2_ena : Enables the Receive Input Interface pmeter2 block when set
recv_pmeter3_ena : Enables the Receive Input Interface pmeter3 block when set
ssel_ recv_pmeter0(2:0) : Selects the sync source for the Receive Input Interface pmeter0 block
ssel_ recv_pmeter1(2:0) : Selects the sync source for the Receive Input Interface pmeter1 block
ssel_ recv_pmeter2(2:0) : Selects the sync source for the Receive Input Interface pmeter2 block
ssel_ recv_pmeter3(2:0) : Selects the sync source for the Receive Input Interface pmeter3 block
GC5018 GENERAL CONTROL
65
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.9
RECV_PMETER0_SQR_SUM_LSB Register
Register name: RECV_PMETER0_SQR_SUM_LSB
Page: 0x1800
Address: 0x08
BIT 15
BIT 8
recv_pmeter0_sqr_sum (15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter0_sqr_sum (7:0)
0
0
0
0
0
0
0
0
recv_pmeter0_sqr_sum(15:0) : The sqr_sum register controls the number of samples to accumulate for
a power measurement. Ia is (or Ia & Qa if complex mode is selected are) squared and
accumulated. Eight Ia samples (or eight sample pairs of Ia and Qa samples) equal to one
sqr_sum count. The accumulation interval is initiated when the sync is asserted and the
programmed (8*sync_delay+2) samples has expired or when the interval start time is
reached. When the (8*sqr_sum+1) sample time is reached, the accumulated powers are
made available for MPU access and an interrupt is generated.
4.4.3.10
RECV_PMETER0_STRT_INTVL_LSB Register
Register name: RECV_PMETER0_STRT_INTVL_LSB
Page: 0x1800
Address: 0x09
BIT 15
BIT 8
recv_pmeter0_strt_intrvl (15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter0_strt_intrvl (7:0)
0
0
0
0
0
0
recv_pmeter0_strt_intrvl(15:0) : The start interval timer is the interval over
restarted. The timer value is (8*strt_intrvl + 1) samples and
(8*sqr_sum+1) samples. The interval start counter and RMS power
at the sync pulse after the programmed delay and every time the
reaches its limit.
66
GC5018 GENERAL CONTROL
0
0
which the sqr_sum is
must be larger than
accumulation is started
STRT_INTRVL counter
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.11
RECV_PMETER0_SYNC_DLY Register
Register name: RECV_PMETER0_SYNC_DLY
Page: 0x1800
Address: 0x0A
BIT 15
delay_line_0(5:0)
0
0
0
0
0
0
unused
BIT 8
recv_pmeter0_
sync_delay(8)
0
0
BIT 7
BIT 0
recv_pmeter0_sync_delay (7:0)
0
0
0
0
0
0
0
0
delay_line_0(5:0) : Pointer offset for the rxin_a path variable delay line. Larger values result in larger
pointer offsets and therefore more path delay.
recv_pmeter0_sync_delay(8:0) : Programmable start delay from sync, in eight sample units. The actual
value is (8*sync_delay + 2) samples.
4.4.3.12
RECV_PMETER0_CONFIG Register
Register name: RECV_PMETER0_CONFIG
Page: 0x1800
Address: 0x0B
BIT 15
BIT 8
recv_pmeter0_strt_intrvl(20:18)
recv_pmeter0_sqr_sum(20:16)
0
0
BIT 7
recv_pmeter0_strt_ intrvl(17:16)
0
0
0
0
0
unused
unused
unused
0
0
0
0
0
0
BIT 0
ssel_delay_line_0(2:0)
0
0
0
recv_pmeter0_sqr_sum(20:16) : MSBs of sqr_sum value, in 8 sample units
recv_pmeter0_strt_intrvl(20:16) : MSBs of start interval value, in 8 sample units.
ssel_delay_line_0(2:0) : Sync source selection for the 64 sample delay line pointer value update
4.4.3.13
RECV_PMETER1_SQR_SUM_LSB Register
Register name: RECV_PMETER1_SQR_SUM_LSB
Page: 0x1800
Address: 0x0C
BIT 15
BIT 8
recv_pmeter1_sqr_sum (15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter1_sqr_sum (7:0)
0
0
0
0
0
0
0
0
recv_pmeter1_sqr_sum(15:0) : Lower 16bits of the sqr_sum interval timer, in 8 sample units.
GC5018 GENERAL CONTROL
67
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.14
RECV_PMETER1_STRT_INTVL_LSB Register
Register name: RECV_PMETER1_STRT_INTVL_LSB
Page: 0x1800
Address: 0x0D
BIT 15
BIT 8
recv_pmeter1_strt_intrvl (15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter1_strt_intrvl (7:0)
0
0
0
0
0
0
0
0
recv_pmeter1_strt_intrvl(15:0) : Lower 16bits of the interval timer, in 8 sample units.
4.4.3.15
RECV_PMETER1_SYNC_DLY Register
Register name: RECV_PMETER1_SYNC_DLY
Page: 0x1800
Address: 0x0E
BIT 15
delay_line_1(5:0)
0
0
0
0
0
0
unused
BIT 8
recv_pmeter1_
sync_ delay(8)
0
0
BIT 7
BIT 0
recv_pmeter1_sync_delay (7:0)
0
0
0
0
0
0
0
0
delay_line_1(5:0) : Pointer offset for the rxin_b path variable delay line. Larger values result in larger
pointer offsets and therefore more path delay
recv_pmeter1_sync_delay(8:0) : Programmable start delay from sync, in 8 sample units.
68
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.16
RECV_PMETER1_CONFIG Register
Register name: RECV_PMETER1_CONFIG
Page: 0x1800
Address: 0x0F
BIT 15
BIT 8
recv_pmeter1_strt_intrvl(20:18)
recv_pmeter1_sqr_sum(20:16)
0
0
BIT 7
recv_pmeter1_strt_ intrvl(17:16)
0
0
0
0
0
unused
unused
unused
0
0
0
0
0
0
BIT 0
ssel_delay_line_1(2:0)
0
0
0
recv_pmeter1_sqr_sum(20:16) : MSBs of sqr_sum value, in 8 sample units.
recv_pmeter1_strt_intrvl(20:16) : MSBs of start interval value, in 8 sample units.
ssel_delay_line_1(2:0) : Sync source selection for the 64 sample delay line pointer value update
4.4.3.17
RECV_PMETER2_SQR_SUM_LSB Register
Register name: RECV_PMETER2_SQR_SUM_LSB
Page: 0x1800
Address: 0x10
BIT 15
BIT 8
recv_pmeter2_sqr_sum (15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter2_sqr_sum (7:0)
0
0
0
0
0
0
0
0
recv_pmeter2_sqr_sum(15:0) : Lower 16bits of the sqr_sum interval timer, in 8 sample units.
GC5018 GENERAL CONTROL
69
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.18
RECV_PMETER2_STRT_INTVL_LSB Register
Register name: RECV_PMETER2_STRT_INTVL_LSB
Page: 0x1800
Address: 0X11
BIT 15
BIT 8
recv_pmeter2_strt_intrvl (15:8)
0
0
0
0
0
0
0
0
BIT 7
BIT 0
recv_pmeter2_strt_intrvl (7:0)
0
0
0
0
0
0
0
0
recv_pmeter2_strt_intrvl(15:0) : Lower 16bits of the interval timer, in 8 sample units.
4.4.3.19
RECV_PMETER2_SYNC_DLY Register
Register name: RECV_PMETER2_SYNC_DLY
Page: 0x1800
Address: 0x12
BIT 15
delay_line_2(5:0)
0
0
0
0
0
0
unused
BIT 8
recv_pmeter2_
sync_ delay(8)
0
0
BIT 7
BIT 0
recv_pmeter2_sync_delay (7:0)
0
0
0
0
0
0
0
0
delay_line_2(5:0) : Pointer offset for the rxin_c path variable delay line. Larger values result in larger
pointer offsets and therefore more path delay.
recv_pmeter2_sync_delay (8:0) : Programmable start delay from sync, in 8 sample units.
4.4.3.20
RECV_PMETER2_CONFIG Register
Register name: RECV_PMETER2_CONFIG
Page: 0x1800
Address: 0X13
BIT 15
BIT 8
recv_pmeter2_strt_intrvl(20:18)
recv_pmeter2_sqr_sum(20:16)
0
0
BIT 7
recv_pmeter2_strt_ intrvl(17:16)
0
0
0
0
0
unused
unused
unused
0
0
0
0
0
0
BIT 0
ssel_delay_line_2(2:0)
0
0
recv_pmeter2_sqr_sum(20:16) : MSBs of sqr_sum value, in 8 sample units.
recv_pmeter2_strt_intrvl(20:16) : MSBs of start interval value, in 8 sample units.
ssel_delay_line_2(2:0) : Sync source selection for the 64 sample delay line pointer value update.
70
GC5018 GENERAL CONTROL
0
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.21
RECV_PMETER3_SQR_SUM_LSB Register
Register name: RECV_PMETER3_SQR_SUM_LSB
Page: 0x1800
Address: 0x14
BIT 15
BIT 8
recv_pmeter3_sqr_sum (15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter3_sqr_sum (7:0)
0
0
0
0
0
0
0
0
recv_pmeter3_sqr_sum(15:0) : Lower 16bits of the sqr_sum interval timer, in 8 sample units.
4.4.3.22
RECV_PMETER3_STRT_INTVL_LSB Register
Register name: RECV_PMETER3_STRT_INTVL_LSB
Page: 0x1800
Address: 0x15
BIT 15
BIT 8
recv_pmeter3_strt_intrvl (15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter3_strt_intrvl (7:0)
0
0
0
0
0
0
0
0
recv_pmeter3_strt_intrvl(15:0) : Lower 16bits of the interval timer, in 8 sample units.
4.4.3.23
RECV_PMETER3_SYNC_DLY Register
Register name: RECV_PMETER3_SYNC_DLY
Page: 0x1800
Address: 0x16
BIT 15
delay_line_3(5:0)
0
0
0
0
0
0
unused
BIT 8
recv_pme
ter3_sync_
delay(8)
0
0
BIT 7
BIT 0
recv_pmeter3_sync_delay (7:0)
0
0
0
0
0
0
0
0
delay_line_3(5:0) : Pointer offset for the rxin_d path variable delay line. Larger values result in larger
pointer offsets and therefore more path delay.
recv_pmeter3_sync_delay(8:0) : Programmable start delay from sync, in 8 sample units.
GC5018 GENERAL CONTROL
71
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.24
RECV_PMETER3_CONFIG Register
Register name: RECV_PMETER3_CONFIG
Page: 0x1800
Address: 0x17
BIT 15
BIT 8
recv_pmeter3_strt_intrvl(20:18)
recv_pmeter3_sqr_sum(20:16)
0
0
BIT 7
recv_pmeter3_strt_ intrvl(17:16)
0
0
0
0
unused
unused
unused
0
0
0
0
0
0
BIT 0
0
ssel_delay_line_3(2:0)
0
0
0
recv_pmeter3_sqr_sum(20:16) : MSBs of sqr_sum value, in 8 sample units
recv_pmeter3_strt_intrvl(20:16) : MSBs of start interval value, in 8 sample units
ssel_delay_line_3(2:0) : Sync source selection for the 64 sample delay line pointer value update
4.4.3.25
RECV_SLF_TST_VALUE Register
Register name: RECV_SLF_TST_VALUE
Page: 0x1800
Address: 0x18
BIT 15
BIT 8
self_test_constant(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
self_test_constant(7:0)
0
0
0
0
0
0
0
0
self_test_constant(15:0) : 16 bit constant presented at the test and noise generator output when
enabled. Used for test and debug purposes.
4.4.3.26
RECV_PMETER0_LSB Register
Register name: RECV_PMETER0_LSB
Page: 0x1820
Address: 0x20
READ ONLY
BIT 15
BIT 8
recv_pmeter0(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter0(7:0)
0
0
0
0
0
recv_pmeter0(15:0) : Lower bits of the power meter 0 measurement
72
GC5018 GENERAL CONTROL
0
0
0
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.27
RECV_PMETER0_MID Register
Register name: RECV_PMETER0_MID
Page: 0x1820
Address: 0x21
READ ONLY
BIT 15
BIT 8
recv_pmeter0(31:24)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter0(23:16)
0
0
0
0
0
0
0
0
recv_pmeter0(31:16) : Mid bits of the power meter 0 measurement
4.4.3.28
RECV_PMETER0_LMSB Register
Register name: RECV_PMETER0_LMSB
Page: 0x1820
Address: 0x22
READ ONLY
BIT 15
BIT 8
recv_pmeter0(47:40)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter0(39:32)
0
0
0
0
0
0
0
0
recv_pmeter0(47:32) : Lower MSB bits of the power meter 0 measurement
4.4.3.29
RECV_PMETER0_UMSB Register
Register name: RECV_PMETER0_UMSB
Page: 0x1820
Address: 0x23
BIT 15
unused
unused
unused
unused
unused
unused
0
0
0
0
0
0
READ ONLY
BIT 8
recv_pmeter0(57:56)
0
BIT 7
0
BIT 0
recv_pmeter0(55:48)
0
0
0
0
0
0
0
0
recv_pmeter0(57:48) : Upper MSB bits of the power meter 0 measurement
GC5018 GENERAL CONTROL
73
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.30
RECV_PMETER1_LSB Register
Register name: RECV_PMETER1_LSB
Page: 0x1820
Address: 0x24
READ ONLY
BIT 15
BIT 8
recv_pmeter1(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter1(7:0)
0
0
0
0
0
0
0
0
recv_pmeter1(15:0) : Lower bits of the power meter 1 measurement
4.4.3.31
RECV_PMETER1_MID Register
Register name: RECV_PMETER1_MID
Page: 0x1820
Address: 0x25
READ ONLY
BIT 15
BIT 8
recv_pmeter1(31:24)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter1(23:16)
0
0
0
0
0
0
0
0
recv_pmeter1(31:16) : Mid bits of the power meter 1 measurement
4.4.3.32
RECV_PMETER1_LMSB Register
Register name: RECV_PMETER1_LMSB
Page: 0x1820
Address: 0x26
READ ONLY
BIT 15
BIT 8
recv_pmeter1(47:40)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter1(39:32)
0
0
0
0
0
0
recv_pmeter1(47:32) : Lower MSB bits of the power meter 1 measurement
74
GC5018 GENERAL CONTROL
0
0
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.33
RECV_PMETER1_UMSB Register
Register name: RECV_PMETER1_UMSB
Page: 0x1820
Address: 0x27
BIT 15
unused
unused
unused
unused
unused
unused
0
0
0
0
0
0
READ ONLY
BIT 8
recv_pmeter1(57:56)
0
BIT 7
0
BIT 0
recv_pmeter1(55:48)
0
0
0
0
0
0
0
0
recv_pmeter1(57:48) : Upper MSB bits of the power meter 1 measurement
4.4.3.34
RECV_PMETER2_LSB Register
Register name: RECV_PMETER2_LSB
Page: 0x1820
Address: 0x28
READ ONLY
BIT 15
BIT 8
recv_pmeter2(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter2(7:0)
0
0
0
0
0
0
0
0
recv_pmeter2(15:0) : Lower bits of the power meter 2 measurement
4.4.3.35
RECV_PMETER2_MID Register
Register name: RECV_PMETER2_MID
Page: 0x1820
Address: 0x29
READ ONLY
BIT 15
BIT 8
recv_pmeter2(31:24)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter2(23:16)
0
0
0
0
0
0
0
0
recv_pmeter2(31:16) : Mid bits of the power meter 2 measurement
GC5018 GENERAL CONTROL
75
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.36
RECV_PMETER2_LMSB Register
Register name: RECV_PMETER2_LMSB
Page: 0x1820
Address: 0x2A READ ONLY
BIT 15
BIT 8
recv_pmeter2(47:40)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter2(39:32)
0
0
0
0
0
0
0
0
recv_pmeter2(47:32) : Lower MSB bits of the power meter 2 measurement
4.4.3.37
RECV_PMETER2_UMSB Register
Register name: RECV_PMETER2_UMSB
Page: 0x1820
Address: 0x2B READ ONLY
BIT 15
unused
unused
unused
unused
unused
unused
0
0
0
0
0
0
BIT 8
recv_pmeter2(57:56)
0
BIT 7
0
BIT 0
recv_pmeter2(55:48)
0
0
0
0
0
0
recv_pmeter2(57:48) : Upper MSB bits of the power meter 2 measurement
76
GC5018 GENERAL CONTROL
0
0
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.38
RECV_PMETER3_LSB Register
Register name: RECV_PMETER3_LSB
Page: 0x1820
Address: 0x2C READ ONLY
BIT 15
BIT 8
recv_pmeter3(15:8)
0
0
0
0
0
0
0
BIT 7
0
0
BIT 0
0
0
0
0
0
0
0
recv_pmeter3(15:0) : Lower bits of the power meter 3 measurement
4.4.3.39
RECV_PMETER3_MID Register
Register name: RECV_PMETER3_MID
Page: 0x1820
Address: 0x2D READ ONLY
BIT 15
BIT 8
recv_pmeter3(31:24)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter3(23:16)
0
0
0
0
0
0
0
0
recv_pmeter3(31:16) : Mid bits of the power meter 3 measurement
4.4.3.40
RECV_PMETER3_LMSB Register
Register name: RECV_PMETER3_LMSB
Page: 0x1820
Address: 0x2E READ_ONLY
BIT 15
BIT 8
recv_pmeter3(47:40)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter3(39:32)
0
0
0
0
0
0
0
0
recv_pmeter3(47:32) : Lower MSB bits of the power meter 3 measurement
GC5018 GENERAL CONTROL
77
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.3.41
RECV_PMETER3_UMSB Register
Register name: RECV_PMETER3_UMSB
BIT 15
unused
unused
0
0
Page: 0x1820
Address: 0x2F READ_ONLY
BIT 8
recv_pmeter3(57:56)
0
0
0
0
0
BIT 7
0
BIT 0
recv_pmeter3(55:48)
0
0
0
0
0
0
0
0
recv_pmeter3(57:48) : Upper MSB bits of the power meter 3 measurement
4.4.4
Receive AGC Controls
4.4.4.1
RAGC_CONFIG0 Register
Register name: RAGC_CONFIG0
Page: 0x1840
Address: 0x00
BIT 15
hp_ena_0
hp_ena_1
hp_ena_2
hp_ena_3
sd_ena_0
sd_ena_1
sd_ena_2
BIT 8
sd_ena_3
0
0
0
0
0
0
0
0
unused
unused
unused
BIT 0
unused
0
0
0
0
BIT 7
ragc_ bypass_0 ragc_ bypass_1 ragc_ bypass_2 ragc_ bypass_3
0
0
0
0
hp_ena_X : Enables the high pass filter in receive AGC X when set.
sd_ena_X : Enables the Signal Detect block in receive AGC X when set.
ragc_bypass_X : Bypasses the receive AGC X block when set.
78
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.2
RAGC_CONFIG1 Register
Register name: RAGC_CONFIG1
BIT 15
ragc_ freeze_0
ragc_ freeze_1
ragc_ freeze_2
0
0
0
BIT 7
complex01
complex23
0
0
Page: 0x1840
Address: 0x01
ragc_ freeze_3
ragc_ clear_0
ragc_ clear_1
ragc_ clear_2
BIT 8
ragc_ clear_3
0
0
0
0
0
BIT 0
ssel_ragc_interval_0(2:0)
0
0
ssel_ragc_interval_1(2:0)
0
0
0
0
ragc_freeze_X : Freezes the receive AGC block when set.
ragc_clear_X : Clears the loop error accumulator when set.
complex01 : When set, receive AGC 0 uses complex input with the second sample stream coming from
receive AGC 1. The clip detect, high pass, and squarer from receive AGC 1 are used to
generate inputs for receive AGC 0.
complex23 : When set, receive AGC 2 uses complex input with the second sample stream coming from
receive AGC 3. The clip detect, high pass, and squarer from receive AGC 3 are used to
generate inputs for receive AGC 2.
ssel_ragc_interval_0(2:0) : Selects the sync source for receive AGC 0. After a programmed delay from
sync, the interval update timer is started.
ssel_ragc_interval_1(2:0) : Selects the sync source for receive AGC 1. After a programmed delay from
sync, the interval update timer is started.
4.4.4.3
RAGC_CONFIG2 Register
Register name: RAGC_CONFIG2
Page: 0x1840
Address: 0x02
BIT 15
ssel_ragc_freeze_0(2:0)
0
0
BIT 7
ssel_ragc_freez
e_2(0)
0
BIT 8
ssel_ragc_ freeze_2(2:1)
ssel_ragc_freeze_1(2:0)
0
0
0
0
0
0
BIT 0
ssel_ragc_freeze_3(2:0)
0
0
unused
0
0
ssel_ragc_interval_2(2:0)
0
0
0
ssel_ragc_freeze_X(2:0) : Selects the sync source that will freeze the receive AGC loop when asserted.
ssel_ragc_interval_2(2:0) : Selects the sync source for receive AGC 2. After a programmed delay from
sync, the interval update timer is started.
GC5018 GENERAL CONTROL
79
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.4
RAGC_CONFIG3 Register
Register name: RAGC_CONFIG3
Page: 0x1840
Address: 0x03
BIT 15
ssel_ragc_clear_0(2:0)
0
0
BIT 7
ssel_ragc_
clear_2(0)
0
BIT 8
ssel_ragc_ clear_2(2:1)
ssel_ragc_clear_1(2:0)
0
0
0
0
0
0
BIT 0
ssel_ragc_clear_3(2:0)
0
0
unused
0
0
ssel_ragc_interval_3(2:0)
0
0
0
ssel_agc_clear_X(2:0 : Controls the selection of the sync that will clear the receive AGC error
accumulator.
ssel_agc_interval_3(2:0) : Selects the sync source for receive AGC 3. After a programmed delay from
sync, the interval update timer is started.
4.4.4.5
RAGC0_INTEGINVL_LSB Register
Register name: RAGC0_INTEGINVL_LSB
Page: 0x1840
Address: 0x04
BIT 15
BIT 8
integ_interval_0(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
integ_interval_0(7:0)
0
0
0
0
0
0
0
0
integ_interval_0(15:0) : The 16 LSBs of the integration time for receive AGC 0.
4.4.4.6
RAGC0_INTEGINVL_MSB Register
Register name: RAGC0_INTEGINVL_MSB
Page: 0x1840
Address: 0x05
BIT 15
BIT 8
ragc_update_0(7:0)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
integ_interval_0(23:16)
0
0
0
0
0
0
0
ragc_update_0(7:0) : Sets the number of receive AGC updates per sync event (0x00 is infinite).
integ_interval_0(23:16) : The eight MSBs of the integration time for receive AGC 0.
80
GC5018 GENERAL CONTROL
0
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.7
RAGC0_CONFIG0 Register
Register name: RAGC0_CONFIG0
Page: 0x1840
Address: 0x06
BIT 15
BIT 8
ragc_sync_delay_0(7:0)
0
0
0
0
0
0
0
BIT 7
BIT 0
hp_corner_0(2:0)
0
0
0
acc_shift_0(4:0)
0
0
0
0
0
0
ragc_sync_delay_0(7:0) : The input sync to the receive AGC block is delayed by this number of samples.
hp_corner_0(2:0) : Sets the corner frequency of the high pass filter. Larger values result in higher corner
frequencies
acc_shift_0(4:0) : Selects the integrated power measurements result bits to be used as the error lookup
table address. A larger number means fewer samples will have to be integrated to achieve
the same result.
4.4.4.8
RAGC0_CONFIG1 Register
Register name: RAGC0_CONFIG1
Page: 0x1840
Address: 0x07
BIT 15
BIT 8
err_shift_0(4:3)
acc_offset_0(5:0)
0
0
0
0
0
0
0
BIT 7
BIT 0
err_shift_0(2:0)
0
0
0
delay_adj_0(4:0)
0
0
0
0
0
0
acc_offset_0(5:0) : Constant subtracted from the integrated power measurement result before the error
lookup table.
err_shift_0(4:0) : Adjusts the loop gain by controlling the amount of shifting applied to the error lookup
table output. Larger values result in higher gain.
delay_adj_0(4:0) : Sets the delay difference, in samples, between the DVGA outputs and the value
applied to the sample multiplier.
GC5018 GENERAL CONTROL
81
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.9
RAGC0_SD_THRESH Register
Register name: RAGC0_SD_THRESH
Page: 0x1840
Address: 0x08
BIT 15
BIT 8
sd_thresh_0(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
sd_thresh_0(7:0)
0
0
0
0
0
0
0
0
sd_thresh_0(15:0) : This is the threshold used by the Signal Detect block to determine if there is signal
on the inputs. The comparison is done to the output of the squarer block, which is a 32 bit
word. Because of this, these bits are aligned with bits 24 down to 8 of the 32 bit squared
value.
4.4.4.10
RAGC0_SD_TIMER Register
Register name: RAGC0_SD_TIMER
Page: 0x1840
Address: 0x09
BIT 15
BIT 8
sd _timer_0(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
sd _timer_0(7:0)
0
0
0
0
0
0
0
0
sd_timer_0(15:0) : Qualification window timer for loss of input signal.
4.4.4.11
RAGC0_SD_SAMPLES Register
Register name: RAGC0_SD_SAMPLES
Page: 0x1840
Address: 0x0A
BIT 15
BIT 8
sd_samples_0(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
sd_samples_0(7:0)
0
0
0
0
0
0
0
0
sd_samples_0(15:0) : Number of samples that must be below the sd_thresh_X within the sd_timer_X
timer value for the loss of signal condition to occur.
82
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.12
RAGC0_CLIP_HITHRESH Register
Register name: RAGC0_CLIP_HITHRESH
Page: 0x1840
Address: 0x0B
BIT 15
BIT 8
clip_hi_thresh_0(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_hi_thresh_0(7:0)
0
0
0
0
0
0
0
0
clip_hi_thresh_0(15:0) : The high threshold value for clip detection.
4.4.4.13
RAGC0_CLIP_LOTHRESH Register
Register name: RAGC0_CLIP_LOTHRESH
Page: 0x1840
Address: 0x0C
BIT 15
BIT 8
clip_lo_thresh_0(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_lo_thresh_0(7:0)
0
0
0
0
0
0
0
0
clip_lo_thresh_0(15:0) : The low threshold value for clip detection.
4.4.4.14
RAGC0_CLIP_HITIMER Register
Register name: RAGC0_CLIP_HITIMER
Page: 0x1840
Address: 0x0D
BIT 15
BIT 8
clip_hi_timer_0(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_hi_timer_0(7:0)
0
0
0
0
0
0
0
0
clip_hi_timer_0(15:0) : The high timer value in Samples
GC5018 GENERAL CONTROL
83
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.15
RAGC0_CLIP_LOTIMER Register
Register name: RAGC0_CLIP_LOTIMER
Page: 0x1840
Address: 0x0E
BIT 15
BIT 8
clip_lo_timer_0(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_lo_timer_0(7:0)
0
0
0
0
0
0
0
0
clip_lo_timer_0(15:0) : The low timer value in Samples.
4.4.4.16
RAGC0_CLIP_SAMPLES Register
Register name: RAGC0_CLIP_SAMPLES
Page: 0x1840
Address: 0x0F
BIT 15
BIT 8
clip_hi_samples_0(7:0)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_lo_samples_0(7:0)
0
0
0
0
0
0
0
0
clip_hi_samples_0(7:0) : Number of samples above the high threshold within the clip high time to enable
the clip event.
clip_lo_samples_0(7:0) : Number of samples below the low threshold within the clip low time to disable
the clip event.
4.4.4.17
RAGC0_CLIP_ERROR Register
Register name: RAGC0_CLIP_ERROR
Page: 0x1840
Address: 0x10
BIT 15
BIT 8
clip_error_0(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_error_0(7:0)
0
0
0
0
0
0
0
0
clip_error_0(15:0) : This is the error value that is added into the loop accumulator when a clip is
detected.
84
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.18
RAGC1_INTEGINVL_LSB Register
Register name: RAGC1_INTEGINVL_LSB
Page: 0x1840
Address: 0x11
BIT 15
BIT 8
integ_interval_1(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
integ_interval_1(7:0)
0
0
0
0
0
0
0
0
integ_interval_1(15:0) : The LSBs of the integration time for receive AGC 1
4.4.4.19
RAGC1_INTEGINVL_MSB Register
Register name: RAGC1_INTEGINVL_MSB
Page: 0x1840
Address: 0x12
BIT 15
BIT 8
ragc_update_1(7:0)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
integ_interval_1(23:16)
0
0
0
0
0
0
0
0
ragc_update_1(7:0) : Sets the number of receive AGC updates per sync event (0x00 is infinite).
integ_interval_1(23:16) : The MSBs of the integration time for receive AGC 1
4.4.4.20
RAGC1_CONFIG0 Register
Register name: RAGC1_CONFIG0
Page: 0x1840
Address: 0x13
BIT 15
BIT 8
ragc_sync_delay_1(7:0)
0
0
0
0
0
0
0
BIT 7
BIT 0
hp_corner_1(2:0)
0
0
0
acc_shift_1(4:0)
0
0
0
0
0
0
ragc_sync_delay_1(7:0) : The input sync to the receive AGC block is delayed by this value of samples.
hp_corner_1(2:0) : This sets the corner frequency of the High Pass filter. Larger values result in higher
corner frequencies.
acc_shift_1(4:0) : Selects the integrated power measurements result bits to be used as the error lookup
table address. A larger number means fewer samples will have to be integrated to achieve
the same result.
GC5018 GENERAL CONTROL
85
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.21
RAGC1_CONFIG1 Register
Register name: RAGC1_CONFIG1
Page: 0x1840
Address: 0x14
BIT 15
BIT 8
err_shift_1(4:3)
acc_offset_1(5:0)
0
0
0
0
0
0
0
BIT 7
BIT 0
err_shift_1(2:0)
0
0
0
delay_adj_1(4:0)
0
0
0
0
0
0
acc_offset_1(5:0) : Constant subtracted from the integrated power measurement result before the error
lookup table
err_shift_1(4:0) : Controls the loop gain by left shifting the error output. Larger values result in higher
gain.
delay_adj_1(4:0) : Sets the delay difference, in samples, between the DVGA outputs and the value
applied to the sample multiplier.
4.4.4.22
RAGC1_SD_THRESH Register
Register name: RAGC1_SD_THRESH
Page: 0x1840
Address: 0x15
BIT 15
BIT 8
sd_thresh_1(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
sd_thresh_1(7:0)
0
0
0
0
0
0
0
0
sd_thresh_1(15:0) : This is the threshold used by the Signal Detect block to determine if there is signal
on the inputs. The comparison is done to the output of the squarer block, which is a 32 bit
word. Because of this, these bits are aligned with bits 24 down to 8 of the 32 bit squared
value.
4.4.4.23
RAGC1_SD_TIMER Register
Register name: RAGC1_SD_TIMER
Page: 0x1840
Address: 0x16
BIT 15
BIT 8
sd_timer_1(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
sd_timer_1(7:0)
0
0
0
0
0
0
0
0
sd_timer_1(15:0) : After the first no signal sample occurs, this is the amount of samples that control the
length of time to determine the loss of signal condition.
86
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.24
RAGC1_SD_SAMPLES Register
Register name: RAGC1_SD_SAMPLES
Page: 0x1840
Address: 0x17
BIT 15
BIT 8
sd_samples_1(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
sd_samples_1(7:0)
0
0
0
0
0
0
0
0
sd_samples_1(15:0) : Number of samples that must be below the sd_thresh_X threshold within the
sd_timer_X timer value for the loss of signal condition to occur.
4.4.4.25
RAGC1_CLIP_HITHRESH Register
Register name: RAGC1_CLIP_HITHRESH
Page: 0x1840
Address: 0x18
BIT 15
BIT 8
clip_hi_thresh_1(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_hi_thresh_1(7:0)
0
0
0
0
0
0
0
0
clip_hi_thresh_1(15:0) : The high threshold value for clip detection.
4.4.4.26
RAGC1_CLIP_LOTHRESH Register
Register name: RAGC1_CLIP_LOTHRESH
Page: 0x1840
Address: 0x19
BIT 15
BIT 8
clip_lo_thresh_1(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_lo_thresh_1(7:0)
0
0
0
0
0
0
0
0
clip_lo_thresh_1(15:0) The low threshold value for clip detection.
GC5018 GENERAL CONTROL
87
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.27
RAGC1_CLIP_HITIMER Register
Register name: RAGC1_CLIP_HITIMER
Page: 0x1840
Address: 0x1A
BIT 15
BIT 8
clip_hi_timer_1(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_hi_timer_1(7:0)
0
0
0
0
0
0
0
0
clip_hi_timer_1(15:0) : The high timer value in samples.
4.4.4.28
RAGC1_CLIP_LOTIMER Register
Register name: RAGC1_CLIP_LOTIMER
Page: 0x1840
Address: 0x1B
BIT 15
BIT 8
clip_lo_timer_1(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_lo_timer_1(7:0)
0
0
0
0
0
0
0
0
clip_lo_timer_1(15:0) : The low timer value in samples.
4.4.4.29
RAGC1_CLIP_SAMPLES Register
Register name: RAGC1_CLIP_SAMPLES
Page: 0x1840
Address: 0x1C
BIT 15
BIT 8
clip_hi_samples_1(7:0)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_lo_samples_1(7:0)
0
0
0
0
0
0
0
0
clip_hi_samples_1(7:0) : Number of samples above the high threshold within the clip high time to enable
the clip event.
clip_lo_samples_1(7:0) : Number of samples below the low threshold within the clip low time to disable
the clip event.
88
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.30
RAGC1_CLIP_ERROR Register
Register name: RAGC1_CLIP_ERROR
Page: 0x1840
Address: 0x1D
BIT 15
BIT 8
clip_error_1(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_error_1(7:0)
0
0
0
0
0
0
0
0
clip_error_1(15:0) : This is the error value that is added into the loop accumulator when a clip is
detected.
4.4.4.31
RAGC2_INTEGINVL_LSB Register
Register name: RAGC2_INTEGINVL_LSB
Page: 0x1840
Address: 0x1E
BIT 15
BIT 8
integ_interval_2(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
integ_interval_2(7:0)
0
0
0
0
0
0
0
0
integ_interval_2(15:0) : The LSBs of the integration time for receive AGC 2
4.4.4.32
RAGC2_INTEGINVL_MSB Register
Register name: RAGC2_INTEGINVL_MSB
Page: 0x1840
Address: 0x1F
BIT 15
BIT 8
ragc_update_2(7:0)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
integ_interval_2(23:16)
0
0
0
0
0
0
0
0
ragc_update_2(7:0) : Sets the number of receive AGC updates per sync event (0x00 is infinite).
integ_interval_2(23:16) : The MSBs of the integration time for receive AGC 2
GC5018 GENERAL CONTROL
89
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.33
RAGC2_CONFIG0 Register
Register name: RAGC2_CONFIG0
Page: 0x1860
Address: 0x20
BIT 15
BIT 8
ragc_sync_delay_2(7:0)
0
0
0
0
0
0
0
BIT 7
BIT 0
hp_corner_2(2:0)
0
0
0
acc_shift_2(4:0)
0
0
0
0
0
0
ragc_sync_delay_2(7:0) : The input sync to the receive AGC block is delayed by this value of samples.
hp_corner_2(2:0) : This sets the corner frequency of the High Pass filter. Larger values result in higher
corner frequencies.
acc_shift_2(4:0) : Selects the integrated power measurements result bits to be used as the error lookup
table address. A larger number means fewer samples will have to be integrated to achieve
the same result.
4.4.4.34
RAGC2_CONFIG1 Register
Register name: RAGC2_CONFIG1
Page: 0x1860
Address: 0x21
BIT 15
BIT 8
err_shift_2(4:3)
acc_offset_2(5:0)
0
0
0
0
0
0
0
BIT 7
BIT 0
err_shift_2(2:0)
0
0
0
delay_adj_2(4:0)
0
0
0
0
0
0
acc_offset_2(5:0) : Constant subtracted from the integrated power measurement result before the error
lookup table.
err_shift_2(4:0) : Controls the loop gain by left shifting the error output. Larger values result in higher
gain..
delay_adj_2(4:0) : Sets the delay difference, in samples, between the DVGA outputs and the value
applied to the sample multiplier.
90
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.35
RAGC2_SD_THRESH Register
Register name: RAGC2_SD_THRESH
Page: 0x1860
Address: 0x22
BIT 15
BIT 8
sd_thresh_2(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
sd_thresh_2(7:0)
0
0
0
0
0
0
0
0
sd_thresh_2(15:0) : This is the threshold used by the Signal Detect block to determine if there is signal
on the inputs. The comparison is done to the output of the squarer block, which is a 32 bit
word. Because of this, these bits are aligned with bits 24 down to 8 of the 32 bit squared
value.
4.4.4.36
RAGC2_SD_TIMER Register
Register name: RAGC2_SD_TIMER
Page: 0x1860
Address: 0x23
BIT 15
BIT 8
sd_timer_2(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
sd_timer_2(7:0)
0
0
0
0
0
0
0
0
sd_timer_2(15:0) : After the first no signal sample occurs, this is the amount of samples that control the
length of time to determine the loss of signal condition.
4.4.4.37
RAGC2_SD_SAMPLES Register
Register name: RAGC2_SD_SAMPLES
Page: 0x1860
Address: 0x24
BIT 15
BIT 8
sd_samples_2(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
sd_samples_2(7:0)
0
0
0
0
0
0
0
0
sd_samples_2(15:0) : Number of samples that must be below the sd_thresh_X threshold within the
sd_timer_X timer value for the loss of signal condition to occur.
GC5018 GENERAL CONTROL
91
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.38
RAGC2_CLIP_HITHRESH Register
Register name: RAGC2_CLIP_HITHRESH
Page: 0x1860
Address: 0x25
BIT 15
BIT 8
clip_hi_thresh_2(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_hi_thresh_2(7:0)
0
0
0
0
0
0
0
0
clip_hi_thresh_2(15:0) : The high threshold value for clip detection.
4.4.4.39
RAGC2_CLIP_LOTHRESH Register
Register name: RAGC2_CLIP_LOTHRESH
Page: 0x1860
Address: 0x26
BIT 15
BIT 8
clip_lo_thresh_2(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_lo_thresh_2(7:0)
0
0
0
0
0
0
0
0
clip_lo_thresh_2(15:0) : The low threshold value for clip detection.
4.4.4.40
RAGC2_CLIP_HITIMER Register
Register name: RAGC2_CLIP_HITIMER
Page: 0x1860
Address: 0x27
BIT 15
BIT 8
clip_hi_timer_2(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_hi_timer_2(7:0)
0
0
0
0
clip_hi_timer_2(15:0) : The high timer value in samples
92
GC5018 GENERAL CONTROL
0
0
0
0
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.41
RAGC2_CLIP_LOTIMER Register
Register name: RAGC2_CLIP_LOTIMER
Page: 0x1860
Address: 0x28
BIT 15
BIT 8
clip_lo_timer_2(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_lo_timer_2(7:0)
0
0
0
0
0
0
0
0
clip_lo_timer_2(15:0) : The low timer value in samples.
4.4.4.42
RAGC2_CLIP_SAMPLES Register
Register name: RAGC2_CLIP_SAMPLES
Page: 0x1860
Address: 0x29
BIT 15
BIT 8
clip_hi_samples_2(7:0)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_lo_samples_2(7:0)
0
0
0
0
0
0
0
0
clip_hi_samples_2(7:0) : Number of samples above the high threshold within the clip high time to enable
the clip event.
clip_lo_samples_2(7:0) : Number of samples below the low threshold within the clip low time to disable
the clip event.
4.4.4.43
RAGC2_CLIP_ERROR Register
Register name: RAGC2_CLIP_ERROR
Page: 0x1860
Address: 0x2A
BIT 15
BIT 8
clip_error_2(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_error_2(7:0)
0
0
0
0
0
0
0
0
clip_error_2(15:0) : This is the error value that is added into the loop accumulator when a clip is
detected.
GC5018 GENERAL CONTROL
93
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.44
RAGC3_INTEGINVL_LSB Register
Register name: RAGC3_INTEGINVL_LSB
Page: 0x1860
Address: 0x2B
BIT 15
BIT 8
integ_interval_3(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
integ_interval_3(7:0)
0
0
0
0
0
0
0
0
integ_interval_3(15:0) : The LSBs of the integration time for receive AGC 3
4.4.4.45
RAGC3_INTEGINVL_MSB Register
Register name: RAGC3_INTEGINVL_MSB
Page: 0x1860
Address: 0x2C
BIT 15
BIT 8
ragc_update_3(7:0)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
integ_interval_3(23:16)
0
0
0
0
0
0
0
0
ragc_update_3(7:0) : Sets the number of receive AGC updates per sync event (0x00 is infinite).
integ_interval_3(23:16) : The MSBs of the integration time for receive AGC 3
4.4.4.46
RAGC3_CONFIG0 Register
Register name: RAGC3_CONFIG0
Page: 0x1860
Address: 0x2D
BIT 15
BIT 8
ragc_sync_delay_3(7:0)
0
0
0
0
0
0
0
BIT 7
BIT 0
hp_corner_3(2:0)
0
0
0
acc_shift_3(4:0)
0
0
0
0
0
0
ragc_sync_delay_3(7:0) : The input sync to the receive AGC block is delayed by this value of samples.
hp_corner_3(2:0) : This sets the corner frequency of the High Pass filter. Larger values result in higher
corner frequencies.
acc_shift_3(4:0) : Selects the integrated power measurements result bits to be used as the error lookup
table address. A larger number means fewer samples will have to be integrated to achieve
the same result.
94
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.47
RAGC3_CONFIG1 Register
Register name: RAGC3_CONFIG1
Page: 0x1860
Address: 0x2E
BIT 15
BIT 8
err_shift_3(4:3)
acc_offset_3(5:0)
0
0
0
0
0
0
0
BIT 7
BIT 0
err_shift_3(2:0)
0
0
0
delay_adj_3(4:0)
0
0
0
0
0
0
acc_offset_3(5:0) : Constant subtracted from the integrated power measurement result before the error
lookup table
err_shift_3(4:0) : Controls the loop gain by left shifting the error output. Larger values result in higher
gain.
delay_adj_3(4:0) : Sets the delay difference, in samples, between the DVGA outputs and the value
applied to the sample multiplier.
4.4.4.48
RAGC3_SD_THRESH Register
Register name: RAGC3_SD_THRESH
Page: 0x1860
Address: 0x2F
BIT 15
BIT 8
sd_thresh_3(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
sd_thresh_3(7:0)
0
0
0
0
0
0
0
0
sd_thresh_3(15:0) : This is the threshold used by the Signal Detect block to determine if there is signal
on the inputs. The comparison is done to the output of the squarer block, which is a 32 bit
word. Because of this, these bits are aligned with bits 24 down to 8 of the 32 bit squared
value.
4.4.4.49
RAGC3_SD_TIMER Register
Register name: RAGC3_SD_TIMER
Page: 0x1860
Address: :
0x30
BIT 15
BIT 8
sd_timer_3(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
sd_timer_3(7:0)
0
0
0
0
0
0
0
0
sd_timer_3(15:0) : After the first no signal sample occurs, this is the amount of samples that control the
length of time to determine the loss of signal condition.
GC5018 GENERAL CONTROL
95
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.50
RAGC3_SD_SAMPLES Register
Register name: RAGC3_SD_SAMPLES
Page: 0x1860
Address: 0x31
BIT 15
BIT 8
sd_samples_3(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
sd_samples_3(7:0)
0
0
0
0
0
0
0
0
sd_samples_3(15:0) : Number of samples that must be below the sd_thresh_X threshold within the
sd_timer_X timer value for the loss of signal condition to occur.
4.4.4.51
RAGC3_CLIP_HITHRESH Register
Register name: RAGC3_CLIP_HITHRESH
Page: 0x1860
Address: 0x32
BIT 15
BIT 8
clip_hi_thresh_3(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_hi_thresh_3(7:0)
0
0
0
0
0
0
0
0
clip_hi_thresh_3(15:0) : The high threshold value for clip detection.
4.4.4.52
RAGC3_CLIP_LOTHRESH Register
Register name: RAGC3_CLIP_LOTHRESH
Page: 0x1860
Address: 0x33
BIT 15
BIT 8
clip_lo_thresh_3(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_lo_thresh_3(7:0)
0
0
0
0
0
clip_lo_thresh_3(15:0) : The low threshold value for clip detection.
96
GC5018 GENERAL CONTROL
0
0
0
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.53
RAGC3_CLIP_HITIMER Register
Register name: RAGC3_CLIP_HITIMER
Page: 0x1860
Address: 0x34
BIT 15
BIT 8
clip_hi_timer_3(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_hi_timer_3(7:0)
0
0
0
0
0
0
0
0
clip_hi_timer_3(15:0) : The clip high timer value in samples
4.4.4.54
RAGC3_CLIP_LOTIMER Register
Register name: RAGC3_CLIP_LOTIMER
Page: 0x1860
Address: 0x35
BIT 15
BIT 8
clip_lo_timer_3(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_lo_timer_3(7:0)
0
0
0
0
0
0
0
0
clip_lo_timer_3(15:0) : The clip low timer value in samples.
4.4.4.55
RAGC3_CLIP_SAMPLES Register
Register name: RAGC3_CLIP_SAMPLES
Page: 0x1860
Address: 0x36
BIT 15
BIT 8
clip_hi_samples_3(7:0)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_lo_samples_3(7:0)
0
0
0
0
0
0
0
0
clip_hi_samples_3(7:0) : Number of samples above the high threshold within the clip high time to enable
a clip event.
clip_lo_samples_3(7:0) : Number of samples below the low threshold within the clip low time to disable a
clip event.
GC5018 GENERAL CONTROL
97
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.56
RAGC3_CLIP_ERROR Register
Register name: RAGC3_CLIP_ERROR
Page: 0x1860
Address: 0x37
BIT 15
BIT 8
clip_error_3(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
clip_error_3(7:0)
0
0
0
0
0
0
0
0
clip_error_3(15:0) : Error value that is added into the loop accumulator when a clip is detected.
4.4.4.57
RAGC0_ACCUM_LSB Register
Register name: RAGC0_ACCUM_LSB
Page: 0x1860
Address: 0x38
READ ONLY
BIT 15
BIT 8
ragc0_accum(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
ragc0_accum (7:0)
0
0
0
0
0
0
0
0
ragc0_accum(15:0) : lower 16 bits of the ragc0 error accumulator.
4.4.4.58
RAGC0_ACCUM_MSB Register
Register name: RAGC0_ACCUM_MSB
Page: 0x1860
Address: 0x39
READ ONLY
BIT 15
BIT 8
ragc0_accum(31:24)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
ragc0_accum (23:16)
0
0
0
0
0
ragc0_accum(31:16) : upper 16 bits of the ragc0 error accumulator.
98
GC5018 GENERAL CONTROL
0
0
0
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.59
RAGC1_ACCUM_LSB Register
Register name: RAGC1_ACCUM_LSB
Page: 0x1860
Address: 0x3A READ ONLY
BIT 15
BIT 8
ragc1_accum(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
ragc1_accum (7:0)
0
0
0
0
0
0
0
0
ragc1_accum(15:0) : lower 16 bits of the ragc1 error accumulator.
4.4.4.60
RAGC1_ACCUM_MSB Register
Register name: RAGC1_ACCUM_MSB
Page: 0x1860
Address: 0x3B READ ONLY
BIT 15
BIT 8
ragc1_accum(31:24)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
ragc1_accum (23:16)
0
0
0
0
0
0
0
0
ragc1_accum(31:16) : upper 16 bits of the ragc1 error accumulator.
4.4.4.61
RAGC2_ACCUM_LSB Register
Register name: RAGC2_ACCUM_LSB
Page: 0x1860
Address: 0x3C READ ONLY
BIT 15
BIT 8
ragc2_accum(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
ragc2_accum (7:0)
0
0
0
0
0
0
0
0
ragc2_accum(15:0) : lower 16 bits of the ragc2 error accumulator.
GC5018 GENERAL CONTROL
99
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.4.62
RAGC2_ACCUM_MSB Register
Register name: RAGC2_ACCUM_MSB
Page: 0x1860
Address: 0x3D READ ONLY
BIT 15
BIT 8
ragc2_accum(31:24)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
ragc2_accum (23:16)
0
0
0
0
0
0
0
0
ragc2_accum(31:16) : upper 16 bits of the ragc2 error accumulator.
4.4.4.63
RAGC3_ACCUM_LSB Register
Register name: RAGC3_ACCUM_LSB
Page: 0x1860
Address: 0x3E READ ONLY
BIT 15
BIT 8
ragc3_accum(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
ragc3_accum (7:0)
0
0
0
0
0
0
0
0
ragc3_accum(15:0) : lower 16 bits of the ragc3 error accumulator.
4.4.4.64
RAGC3_ACCUM_MSB Register
Register name: RAGC3_ACCUM_MSB
Page: 0x1860
Address: 0x3F READ ONLY
BIT 15
BIT 8
ragc3_accum(31:24)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
ragc3_accum (23:16)
0
0
0
0
0
ragc3_accum(31:16) : upper 16 bits of the ragc3 error accumulator.
100
GC5018 GENERAL CONTROL
0
0
0
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5
DDC Channel Controls
4.4.5.1
FIR_MODE Register
Register name: FIR_MODE
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
BIT 15
cdma_mode
unused
unused
0
0
0
Address: 0x00
BIT 8
crastarttap_pfir(4:0)
0
0
0
0
0
unused
unused
BIT 0
unused
0
0
0
BIT 7
crastarttap_cfir(4:0)
0
0
0
0
0
cdma_mode : When asserted the DDC block is in CDMA mode (2 streams per DDC block).
crastarttap_pfir : These bits define the number of taps that PFIR will use for the filtering.
crastarttap_cfir : These bits define the number of taps that CFIR will use for the filtering.
Formulas for the number of taps, in the different FIR’s, using the crastarttap word.
DDC PFIR: 4*(crastarttap_pfir+1)
DDC PFIR long mode: 8*(crastarttap_pfir+1)
DDC CFIR: 2*(crastarttap_cfir+1)
4.4.5.2
FIR_GAIN Register
Register name: FIR_GAIN
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x01
BIT 15
pfir_gain(2:0)
0
unused
unused
unused
unused
BIT 8
unused
0
0
0
0
0
0
0
unused
unused
unused
unused
unused
unused
unused
unused
0
0
0
0
0
0
0
0
BIT 7
BIT 0
pfir_gain(2:0) : PFIR gain, from 2e-19 to 2e-12 for the receive PFIR. (“000” = 2e-19 and “111” = 2e-12)
cfir_gain :
When ‘0’ then the gain of the CFIR is 2e-19, otherwise when set to ‘1’ the gain is 2e-18.
GC5018 GENERAL CONTROL
101
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.3
SQR_SUM Register
Register name: SQR_SUM
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x02
BIT 15
BIT 8
pmeter_sqr_sum_ddc(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
pmeter_sqr_sum_ddc(7:0)
0
0
0
0
0
0
0
0
pmeter_sqr_sum_ddc(15:0): The sqr_sum register is the number of 4 sample sets to accumulate for a
power measurement. In CDMA mode, one sample set is the I & Q of the signal and diversity.
Ia & Qa (signal) are each squared and accumulated and Ib & Qb (diversity) are squared and
accumulated. In UMTS mode, each I and Q pair are squared and accumulated. 4 samples is
equal to one SQR_SUM count. The count is initiated when the sync is asserted or when the
interval start time is reached. When the SQR_NUM number is reached, the accumulated
powers are made available for MPU access and an interrupt is generated.
4.4.5.4
STRT_INTRVL Register
Register name: STRT_INTRVL
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x03
BIT 15
BIT 8
pmeter_sync_delay_ddc(7:0)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
pmeter_interval_ddc(7:0)
0
0
0
0
0
0
0
0
pmeter_sync_delay_ddc(7:0) : The delay from selected sync source to when the power calculation
starts. The actual value is sync_delay + 1.
pmeter_interval_ddc(7:0) : The start interval timer is the interval over which the SQR_SUM is restarted
and must be greater than the SQR_SUM. The actual interval is interval +1, and must be
greater than the sqr_sum interval. The interval start counter and RMS power accumulation
is started at the sync pulse after the programmed delay and every time the interval counter
reaches its limit. This value is in 1024 sample units.
102
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.5
CIC_MODE1 Register
Register name: CIC_MODE1
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x04
BIT 15
BIT 8
cic_scale_a(4:0)
0
0
BIT 7
cic_scale_b(1:0)
0
0
cic_scale_b(4:2)
0
0
0
0
0
BIT 0
cic_gain_ ddc
0
0
cic_decim(4:0)
0
0
0
0
0
cic_scale_a(4:0) : This sets the gain shift at the output of the A channel CIC. 0x00 is no shift, each
increment by 1 increases the signal amplitude by 2X.
cic_scale_b(4:0) : This sets the gain shift at the output of the B channel CIC. 0x00 is no shift, each
increment by 1 increases the signal amplitude by 2X.
cic_gain_ddc : Adds a fixed gain of 12dB at the CIC output when asserted.
cic_decim(4:0) : Sets the CIC decimation rate, where decimation is cic_decim + 1.
4.4.5.6
CIC_MODE2 Register
Register name: CIC_MODE2
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
BIT 15
BIT 8
cic_m2_ena_b(5:4)
cic_m2_ena_a(5:0)
0
0
0
0
Address: 0x05
0
0
0
0
unused
unused
unused
BIT 0
unused
0
0
0
0
BIT 7
cic_m2_ena_b(3:0)
0
0
0
0
cic_m2_ena_a(5:0) : Programs the A channel CIC fir sections M value to 2 when set, 1 when cleared.
cic_m2_ena_a(0) controls the M value for the first comb section and cic_m2_ena_a(5)
controls the M value for the last comb section.
cic_m2_ena_b(5:0) : Programs the B channel CIC fir sections M value to 2 when set, 1 when cleared.
cic_m2_ena_b(0) controls the M value for the first comb section and cic_m2_ena_b(5)
controls the M value for the last comb section.
GC5018 GENERAL CONTROL
103
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.7
TADJC Register
Register name: TADJC
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
BIT 15
unused
unused
unused
0
0
0
BIT 7
unused
0
0
DOUBLE BUFFERED, REQUIRES SYNC FOR
LOADING
tadj_offset_coarse_a(2:0)
0
tadj_offset_coarse_b(2:0)
0
Address: 0x06
0
unused
BIT 8
unused
0
0
0
0
unused
unused
unused
BIT 0
unused
0
0
0
0
tadj_offset_coarse_a(2:0) : This is the coarse time adjustment offset and acts as an offset from the write
address in the delay ram. This value affects the A data in the path if CDMA mode is being
used. Each LSB is one more offset between input to the course delay block and the output of
the course block.
dj_offset_coarse_b(2:0) : Effects the B channel in CDMA, just as the above effects the A channel.
4.4.5.8
TADJF Register
Register name: TADJF
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x07
DOUBLE BUFFERED, REQUIRES SYNC FOR
LOADING
BIT 15
tadj_offset_fine_a(2:0)
BIT 8
tadj_interp(2:1)
tadj_offset_fine_b(2:0)
0
0
0
0
0
0
0
0
BIT 7
tadj_interp(0)
unused
unused
unused
unused
unused
unused
BIT 0
unused
0
0
0
0
0
0
0
0
tadj_offset_fine_a(2:0) : This is the fine adjust (zero stuff offset) value. It adjusts the time delay at the
rxclk rate. This value affects the A channel data in the path if CDMA mode is being used.
tadj_offset_fine_b(2:0) : Same as above except this value affects the B channel data in CDMA mode.
tadj_interp(2:0) : This is the interpolation (zero stuff) value for the fine time adjust block. Interpolation
can be from 1 to 8 (tadj_interp + 1). This value affects the A and B data in the path if CDMA
mode is being used.
104
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.9
PHASEADD0A Register
Register name: PHASEADD0A
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x08
DOUBLE BUFFERED, REQUIRES SYNC FOR
LOADING
BIT 15
BIT 8
phase_add_a(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
phase_add_a(7:0)
0
0
0
0
0
0
0
0
phase_add_a(15:0) This 32 bit word is used to control the frequency of the NCO. This value is added to
the frequency accumulator every clock cycle (UMTS mode and Main channel in CDMA
mode).
4.4.5.10
PHASEADD1A Register
Register name: PHASEADD1A
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x09
DOUBLE BUFFERED, REQUIRES SYNC FOR
LOADING
BIT 15
BIT 8
phase_add_a(31:24)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
phase_add_a(23:16)
0
0
0
0
0
0
0
0
phase_add_a(31:16) : This 32 bit word is used to control the frequency of the NCO. This value is added
to the frequency accumulator every clock cycle (UMTS mode and A channel in CDMA
mode).
4.4.5.11
PHASEADD0B Register
Register name: PHASEADD0
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x0A DOUBLE BUFFERED, REQUIRES SYNC FOR
LOADING
BIT 15
BIT 8
phase_add_b(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
phase_add_b(7:0)
0
0
0
0
0
0
0
0
phase_add_b(15:0) : This 32 bit word is used to control the frequency of the NCO. This value is added
to the frequency accumulator every clock cycle (B channel in CDMA mode).
GC5018 GENERAL CONTROL
105
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.12
PHASEADD1B Register
Register name: PHASEADD1B
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x0B DOUBLE BUFFERED, REQUIRES SYNC FOR
LOADING
BIT 15
BIT 8
phase_add_b(31:24)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
phase_add_b(23:16)
0
0
0
0
0
0
0
0
phase_add_b(31:16) : This 32 bit word is used to control the frequency of the NCO. This value is added
to the frequency accumulator every clock cycle (B channel in CDMA mode).
4.4.5.13
PHASE_OFFSETA Register
Register name:
PHASE_OFFSETA
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x0C DOUBLE BUFFERED, REQUIRES SYNC FOR
LOADING
BIT 15
BIT 8
phase_offset_a(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
phase_offset_a(7:0)
0
0
0
0
0
0
0
0
phase_offset_a(15:0) : This is the fixed phase offset added to the output of the frequency accumulator
for sinusoid generation in the NCO. (UMTS mode and A channel in CDMA mode).
4.4.5.14
PHASE_OFFSETB Register
Register name:
PHASE_OFFSETB
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x0D DOUBLE BUFFERED, REQUIRES SYNC FOR
LOADING
BIT 15
BIT 8
phase_offset_b(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
phase_offset_b(7:0)
0
0
0
0
0
0
0
0
phase_offset_b(15:0) : This is the fixed phase offset added to the output of the frequency accumulator
for sinusoid generation in the NCO. (B channel in CDMA mode)
106
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.15
CONFIG1 Register
Register name: CONFIG1
BIT 15
dither_ena
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
dither_mask(1:0)
Address: 0x0E
pmeter_ sync_
disable
ddc_ena
muxed _data
mixer_gain
BIT 8
mpu_ram_read
0
0
0
0
0
0
0
0
BIT 7
unused
unused
unused
unused
unused
zero_ qsample
mux_pos
BIT 0
mux_factor
0
0
0
0
0
0
0
0
dither_ena : This bit controls whether dither is turned on(1) or off(0).
dither_mask(1) : This bit controls the MASKing of the dither word’s MSB. (1= MASKed, 0=used in dither
word)
dither_mask(0) : This bit controls the MASKing of the dither word’s MSB-1. (1= MASKed, 0=used in
dither word)
pmeter_sync_disable : Turns off the sync to the channel power meter. This can be used to individually
turn off syncs to a channels power meter while still having syncs to other power meters
available.
ddc_ena :
When set this turns on the DDC. When cleared, the clocks to this block are turned off. For
the DDC blocks used as the second half in the long PFIR configuration, this bit should be
cleared.
muxed_data : When asserted the DDC mux block assumes that multiple channels are muxed together on
one input data stream. For factory use only.
For a 2X muxed stream it would look like: Sa0, Sb0, Sa1, Sb1, Sa2, Sb2 …. etc...
mixer_gain : Adds a fixed 6 dB of gain to the mixer output(before round and limiting) when asserted.
mpu_ram_read : (TESTING PURPOSES) Allows the coefficient RAMs in the PFIR/CFIR to be read out
the mpu data bus. Unfortunately, this cannot be done during normal operation and must be
done when the state of the output data is not important. THIS BIT MUST ONLY BE SET
DURING THE MPU READ OPERATION AND MUST BE CLEARED FOR NORMAL DDC
OPERATION.
zero_qsample : When asserted, the Q sample into the mixer is held to zero. For UMTS mode at any input
rate, and CDMA mode with input rates of rxclk/2 or lower, this bit must be set for real only
input data mode (also for muxed input data stream modes). For real only inputs at the full
rxclk rate in CDMA mode, the remix_only bit must be set in the DDCCONFIG1 register.
mux_pos : These bits set the position for selection in the muxed data stream. This value must be less
than or equal to the mux_factor bits.
mux_factor : These two bits set the number of channels in the data stream. 0=1 stream, 1=2 streams.
The ch_rate_sel bits for the DDC should be programmed to rxclk/2 for the 2 streams mode.
GC5018 GENERAL CONTROL
107
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.16
CONFIG2 Register
Register name: CONFIG2
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x0F
BIT 15
unused
unused
unused
unused
unused
unused
unused
BIT 8
unused
0
0
0
0
0
0
0
0
BIT 7
unused
unused
0
0
BIT 0
ddc_tst_sel(5:0)
0
0
0
0
0
0
ddc_tst_sel(5:0) : This is the selection of which signal comes out the test bus. When a constant ‘0’ is
selected this also reduces power by preventing the data at the input of the tst_blk from
changing. It does not stop the clock however. The 36 bits for the testbus are routed to the
rxin_c, rxin_d, dvga_c and dvga_d pins on the chip.
108
SYNC on dvga_c(0)
AFLAG on dvga_d(5)
ddc_tst_sel(5:0)
N
000000
constant 0
Y
000001
pfir output – (35:18) I and (17:0) Q
Y
000010
cfir output – (35:18) I and (17:0) Q
N
000011
tadj A output – (35:18) I and (17:0) Q
N
000100
tadj B output – (35:18) I and (17:0) Q
N
000101
nco SINE output – (35:20) zeroed (19:0) SINE
N
000110
nco COSINE output – (35:20) zeroed (19:0) COSINE
N
000111
cic output – (35:18) I and (17:0) Q
Y
001000
agc output – (35:11) I and (10:0) Q
{full 25b I result and upper 11b Q result}
N
001001
mix A output – (35:18) i*cos-q*sin and (17:0) i*sin+q*cos
N
001010
mix B output – (35:18) i*cos-q*sin and (17:0) i*sin+q*cos
N
001011
DDC MUX A output (35:18) I and (17:0) Q
N
001100
DDC MUX B output (35:18) I and (17:0) Q
GC5018 GENERAL CONTROL
Data selected for output (36 bits total)
rxin_d(15:0), dvga_c(3:2), rxin_c(15:0), dvga_c(5:4)
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.17
AGC_CONFIG1 Register
Register name: AGC_CONFIG1
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x10
BIT 15
BIT 8
agc_dblw(3:0)
0
0
agc_dabv(3:0)
0
0
0
0
0
BIT 7
BIT 0
agc_dzro(3:0)
0
0
0
agc_dsat(3:0)
0
0
0
0
0
0
agc_dblw(3:0) : The value to shift the gain that is then added to the accumulator when the value of the
incoming data * current gain value is below the Threshold.
agc_dabv(3:0) : The value to shift the gain that is then subtracted from the accumulator when the value
of the incoming data * the current gain value is above the Threshold.
agc_dzro(3:0) : The value to shift the gain that is then added to the accumulator when the value of the
incoming data * current gain values consistently equal to zero. (Usually a smaller number
than agc_dblw).
agc_dsat(3:0) : The value to shift the gain that is then subtracted form the accumulator when the value of
the incoming data * the current gain value is consistently equal to maximum (saturation).
NOTE: The larger the number in the above words, the smaller the step size. The above values control the
AGC gain shifting (range is from 3 to 18).
4.4.5.18
AGC_CONFIG2 Register
Register name: AGC_CONFIG2
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x11
BIT 15
BIT 8
zero_msk(3:0)
0
0
agc_rnd(3:0)
0
0
0
0
0
BIT 7
0
BIT 0
agc_thresh(7:0)
0
0
0
0
0
0
0
0
zero_msk(3:0) : Masks the lower 4 bits of the magnitude of the input signal so that they are counted as
zeros.
agc_rnd(3:0) : Determines where to round the output of the AGC; the number of bits output is (18 –
agc_rnd). For example, 0000 is 18 bits.
agc_thresh(7:0) : Threshold for (input * gain) comparison. This value is compared to the magnitude of
the upper eight bits of the agc output.
GC5018 GENERAL CONTROL
109
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.19
AGC_CONFIG3 Register
Register name: AGC_CONFIG3
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
BIT 15
unused
unused
unused
agc_ freeze
0
0
0
0
BIT 7
unused
unused
unused
agc_ clear
0
0
0
0
Address: 0x12
BIT 8
agc_max_cnt(3:0)
0
0
0
0
BIT 0
agc_zero_cnt(3:0)
0
0
0
0
agc_freeze : Freezes the agc when set. This should be asserted when the AGC algorithm is bypassed or
held constant.
agc_max_cnt(3:0) : When the agc_output (input * gain) is at full scale for this number of samples, then
the gain shift value is changed to agc_dsat.
agc_clear : Clears the AGC accumulator when set. Assert this when the AGC is in bypass mode.
agc_zero_cnt(3:0) : when the agc_output (input * gain) is zero value for this number of samples, then
the gain shift value is changed to agc_dzro.
4.4.5.20
AGC_GAINMSB Register
Register name:
AGC_GAINMSB
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x13
DOUBLE BUFFERED, REQUIRES SYNC FOR
LOADING
BIT 15
BIT 8
agc_gaina(23:16)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
agc_gainb(23:16)
0
0
0
0
agc_gaina(23:16) : MSBs of the agc_gaina word.
agc_gainb(23:16) : MSBs of the agc_gainb word.
110
GC5018 GENERAL CONTROL
0
0
0
0
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.21
AGC_GAINA Register
Register name: AGC_GAINA
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x14
DOUBLE BUFFERED, REQUIRES SYNC FOR
LOADING
BIT 15
BIT 8
agc_gaina(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
agc_gaina(7:0)
0
0
0
0
0
0
0
0
agc_gaina(15:0) : This is the lower 16 bits of the total 24 bits of programmable gain. The gain value is
always positive with the upper 12 bits being the integer value and the lower 12 bits being the
fractional. This gain value is used for all UMTS operations and for A channel data when in
CDMA mode. A 24-bit value of 00000000001.000000000000 is unity gain.
4.4.5.22
AGC_GAINB Register
Register name: AGC_GAINB
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x15
DOUBLE BUFFERED, REQUIRES SYNC FOR
LOADING
BIT 15
BIT 8
agc_gainb(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
agc_gainb(7:0)
0
0
0
0
0
0
0
0
agc_gainb(15:0) : This is the lower 16 of the total of 24 bit of programmable gain. The gain value is
always positive with the upper 12 bits being the integer value and the lower 12 bits being the
fractional. This gain value is used for B channel data when in CDMA. A 24-bit value of
00000000001.000000000000 is unity gain.
GC5018 GENERAL CONTROL
111
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.23
AGC_AMAX Register
Register name: AGC_AMAX
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x16
BIT 15
BIT 8
agc_amax(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
agc_amax(7:0)
0
0
0
0
0
0
0
0
agc_amax(15:0) : This is the maximum gaina or gainb can be adjusted up. The value programmed is a
positive value that is used to generate the most positive AGC gain adjust. For example, if
512 is programmed, the maximum gain will be the programmed gain (AGC_GAINA/B) + 512.
4.4.5.24
AGC_AMIN Register
Register name: AGC_AMIN
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x17
BIT 15
BIT 8
agc_amin(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
agc_amin(7:0)
0
0
0
0
0
0
0
0
agc_amin(15:0) : This is the minimum gaina or gainb can be adjusted down. The value programmed is a
positive value that is inverted internally to generate the most negative AGC gain adjust. For
example, if 512 is programmed, the minimum gain will be the programmed gain
(AGC_GAINA/B) – 512.
112
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.25
PSER_CONFIG1 Register
Register name: PSER_CONFIG1
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
BIT 15
unused
Address: 0x18
BIT 8
pser_recv_fsinvl(6:0)
0
0
0
BIT 7
unused
unused
unused
0
0
0
0
0
0
0
0
BIT 0
pser_recv_bits(4:0)
0
0
0
0
0
pser_recv_fsinvl(6:0) : Receive serial interface frame sync interval in bit clocks.
pser_recv_bits(4:0) : Number of output bits per sample-1; for 18 bits, this is set to {10001}.
4.4.5.26
PSER_CONFIG2 Register
Register name: PSER_CONFIG2
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x19
BIT 15
pser_recv_clkdiv(3:0)
unused
unused
unused
BIT 8
unused
0
0
0
0
0
0
0
0
BIT 7
pser_recv_8pin
pser_recv_alt
unused
unused
unused
unused
0
0
0
0
0
0
BIT 0
pser_recv_fsdel(1:0)
0
0
pser_recv_clkdiv(3:0) : Receive serial interface clock divider rate-1; 0 is full rate and 15 divides the
clock by 16. For example, to run the receive serial interface at 1/4 the GC5018 clock, set
pser_recv_clkdiv(3:0) = 0011.
pser_recv_8pin : When set, 4 pins are used for I and 4 pins for Q in UMTS mode. When cleared, 2 pins
are used for I and 2 pins for Q. This is used in combination with the pser_recv_alt bit. When
this bit is set, it would be set in 2 adjacent DDC channels; one would also set the
pser_recv_alt bit in the adjacent DDC. This will cause the I channel to be serialized on 4 pins
and the Q channel to be serialized on the adjacent channels 4 pins.
pser_recv_alt : When set, this channel's receive serial interface will output the Q data from the adjacent
DDC channel.
pser_recv_fsdel(1:0) : Delay between the receive frame sync output and the MSB of serial data
{3,2,1,0}. This number is in serial output bit times, not rxclk periods.
GC5018 GENERAL CONTROL
113
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.27
DDCCONFIG1 Register
Register name: DDCCONFIG1
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x1A
BIT 15
ddcmux_sel_a (3:0)
0
0
0
agc_rnd_
disable
gain_mon
0
0
remix_only
cic_ bypass
0
0
0
BIT 8
ch_rate_sel(1:0)
0
BIT 7
ddcmux_sel_b(3:0)
0
0
0
0
0
BIT 0
double_tap(1:0)
0
0
ddcmux_sel_X(3:0) : Controls which samples go to the mixer for I/Q. Since in CDMA there are two
streams, an A and B stream, two mux select values are used.
Select Value
I data from X input
Q data from X input
0000
RXINA
RXINA
0001
RXINB
RXINB
0010
RXINC
RXINC
0011
RXIND
RXIND
0100
RXINA
RXINB
0101
RXINA
RXINC
0110
RXINA
RXIND
0111
RXINB
RXINA
1000
RXINB
RXINC
1001
RXINB
RXIND
1010
RXINC
RXINA
1011
RXINC
RXINB
1100
RXINC
RXIND
1101
RXIND
RXINA
1110
RXIND
RXINB
1111
RXIND
RXINC
agc_rnd_disable : When set, the agc_rnd bits have no effect. The whole 29 bits are used in the rounding
and the round bit is bit4.
gain_mon : Combines the gain with the I/Q output signals when asserted.
OUTPUT
Bits(17:10)
Bits(9:4)
I
Gained I value
Q
Gained Q value
Bits(3:2)
Gain(18:11)
Gain(10:5)
Bits(1:0)
"00"
Shift status(1:0)
"00"
ch_rate_sel(1:0) : Sets the DDC channel input data rate. The value set here should match the value in
the Receive Input Interface rate select bits (rate_sel).
ch_rate_sel
114
GC5018 GENERAL CONTROL
Input data rate
00
rxclk
01
rxclk/2
10
rxclk/4
11
rxclk/8
www.ti.com
GC5018
8-CHANNEL WIDEBAND RECEIVER
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
When muxed_data is set (Factory Use Only) rate_sel should be set to rxclk “00” and ch_rate_sel should
be set to rxclk/2 “01”.
remix_only : Assert this when real only, full rxclk rate input data is used in CDMA mode. The signal on
the Q bus selected by the ddcmux_sel_X(3:0) bits above is ignored (functions as if the Q
data is 0).
cic_bypass : Factory Use Only. If asserted then the data from the rxin_a(15:0) and rxin_b(15:0) are fed
directly into the cfir input as I and Q respectively. rxin_a(0) also functions as the “sync_cfir”
signal and should rise at the beginning of input data.
ONLY DDC0, DDC2, DDC4 and DDC6 can be the UMTS double tap (64 to 128 tap) PFIR Mode.
DDC1, DDC3, DDC5 and DDC7 PFIRs are used to lengthen the DDC0, DDC2, DDC4 and DDC6
PFIRs.
double_tap(1) : When set, the DDC is in double length PFIR mode which sends the data out of the last
PFIR sample ram in this DDC (DDC0, DDC2, DDC4, DDC6) to the adjacent secondary DDC
(DDC1, DDC3, DDC5, DDC7) PFIR forming a 128-tap delay line. Output data received from
the adjacent secondary DDC PFIR summer is added into the Main DDC’s PFIR sum to form
the final output.
double_tap(0) : When set, the PFIR input comes from the adjacent(Main) PFIR. When cleared, PFIR
input is from the CFIR connected directly to this PFIR. Only valid in DDC1, DDC3, DDC5
and DDC7. The ddc_ena bit in the CONFIG1 register should be cleared for the DDC1,
DDC3, DDC5 and DDC7 when double_tap(0) is set.
NOTE: to put 2 DDCs in to 128 tap mode:
Program DDC0/DDC2/DDC4/DDC6 double_tap(1:0) to “10” and ddc_ena to “1”.
Program DDC1/DDC3/DDC5/DDC7 double_tap(1:0) to “01” and ddc_ena to “0”.
GC5018 GENERAL CONTROL
115
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.28
SYNC_0 Register
Register name: SYNC_0
BIT 15
unused
0
Address: 0x1B
BIT 8
ssel_cic(2:0)
0
BIT 7
unused
0
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
0
unused
0
0
ssel_pmeter(2:0)
0
0
0
BIT 0
ssel_agc_freeze(2:0)
1
1
unused
0
0
ssel_serial(2:0)
0
0
0
ssel_cic(2:0) : Selects the sync source for the DDC CIC filter, thus setting the decimation moment.
ssel_pmeter(2:0) : Selects the sync source for the channel power meter.
ssel_agc_freeze(2:0) : Selects the sync that is used to hold the AGC in freeze mode. With this
functionality the user can program the AGC freeze control to look at the state of an input
sync, or the one shots. It defaults to being off or not looking at any syncs and not driving the
freeze control. This way, upon startup, the chip looks at the MPU register bit for AGC
freezing and not the syncs.
ssel_serial(2:0) : Selects the sync source for the DDC serial interface state machines.
Sync sources are contained in this and many of the following registers. For all sync source selections:
116
ssel_XXXX(2:0)
Selected sync source for DDC
000
rxsyncA
001
rxsyncB
010
rxsyncC
GC5018 GENERAL CONTROL
011
rxsyncD
100
DDC sync counter
101
one shot (register write triggered)
110
always 0
111
always 1
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.29
SYNC_1 Register
Register name: SYNC_1
BIT 15
unused
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x1C
BIT 8
ssel_tadj_fine(2:0)
0
0
BIT 7
unused
0
unused
0
ssel_tadj_reg(2:0)
0
0
0
0
BIT 0
ssel_gain(2:0)
0
0
0
unused
0
ssel_ddc_agc(2:0)
0
0
0
0
ssel_tadj_fine(2:0) : Selects the sync source for the fine time adjust zero stuff moment.
ssel_tadj_reg(2:0) : Selects the sync source for the fine and coarse time adjust register updates.
ssel_gain(2:0) : Selects the sync source for the DDC AGC gain register.
ssel_ddc_agc(2:0) : Selects the sync source to initialize the AGC, primarily for test purposes.
4.4.5.30
SYNC_2 Register
Register name: SYNC_2
BIT 15
unused
0
Page: 0x0%00
where:
% = 2×(DDC channel #)+1
Address: 0x1D
BIT 8
ssel_nco(2:0)
0
BIT 7
unused
0
unused
0
0
ssel_dither(2:0)
0
0
0
BIT 0
ssel_freq(2:0)
0
unused
0
0
0
0
ssel_nco :
Selects the sync source for the NCO accumulator reset.
ssel_phase (2:0)
0
0
0
ssel_dither : Selects the sync source for the NCO phase dither generator reset.
ssel_freq : Selects the sync source for the NCO frequency register.
ssel_phase : Selects the sync source for the NCO phase offset register.
GC5018 GENERAL CONTROL
117
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.31
DDC_CHK_SUM Register
Register name: DDC_CHK_SUM
Page: 0x0%20
where:
% = 2×(DDC channel #)+1
Address: 0x20
READ ONLY
BIT 15
BIT 8
ddc_chk_sum(15:0)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
ddc_chk_sum(7:0)
0
0
0
0
0
0
0
0
ddc_chk_sum : The DDC self test checksum value
4.4.5.32
PMETER_RESULT_A_LSB Register
Register name: PMETER_RESULT_A_LSB
Page: 0x0%20
where:
% = 2×(DDC channel #)+1
Address: 0x21
READ ONLY
BIT 15
BIT 8
pmeter_result_a(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
pmeter_result_a(7:0)
0
0
0
0
0
0
0
0
pmeter_result_a(15:0) : Lower 16 bits of the UMTS mode or CDMA mode A channel power
measurement.
118
GC5018 GENERAL CONTROL
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.33
PMETER_RESULT_A_MID Register
Register name: PMETER_RESULT_A_MID
Page: 0x0%20
where:
% = 2×(DDC channel #)+1
Address: 0x22
READ ONLY
BIT 15
BIT 8
pmeter_result_a(31:24)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
pmeter_result_a(23:16)
0
0
0
0
0
0
0
0
pmeter_result_a(31:16) : Mid 16 bits of the UMTS mode or CDMA mode A channel power measurement.
4.4.5.34
PMETER_RESULT_A_MSB Register
Register name: PMETER_RESULT_A_MSB
Page: 0x0%20
where:
% = 2×(DDC channel #)+1
Address: 0x23
READ ONLY
BIT 15
BIT 8
pmeter_result_a(47:40)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
pmeter_result_a(39:32)
0
0
0
0
0
0
0
0
pmeter_result_a(47:32) : Upper mid 16 bits of the UMTS mode or CDMA mode A channel power
measurement.
4.4.5.35
PMETER_RESULT_B_LSB Register
Register name: PMETER_RESULT_B_LSB
Page: 0x0%20
where:
% = 2×(DDC channel #)+1
Address: 0x24
READ ONLY
BIT 15
BIT 8
pmeter_result_b(15:8)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
pmeter_result_b(7:0)
0
0
0
0
0
0
0
0
pmeter_result_b(15:0) : Lower 16 bits of the CDMA mode B channel power measurement
GC5018 GENERAL CONTROL
119
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.36
PMETER_RESULT_B_MID Register
Register name: PMETER_RESULT_B_MID
Page: 0x0%20
where:
% = 2×(DDC channel #)+1
Address: 0x25
READ ONLY
BIT 15
BIT 8
pmeter_result_b(31:24)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
pmeter_result_b(23:16)
0
0
0
0
0
0
0
0
pmeter_result_b(31:16) : Mid 16 bits of the CDMA mode B channel power measurement.
4.4.5.37
PMETER_RESULT_B_MSB Register
Register name: PMETER_RESULT_B_MSB
Page: 0x0%20
where:
% = 2×(DDC channel #)+1
Address: 0x26
READ ONLY
BIT 15
BIT 8
pmeter_result_b(47:40)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
pmeter_result_b(39:32)
0
0
0
0
0
0
0
pmeter_result_b(47:32) : Upper mid 16 bits of the CDMA mode B channel power measurement.
120
GC5018 GENERAL CONTROL
0
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
4.4.5.38
PMETER_RESULT_AB_UMSB Register
Register name: PMETER_RESULT_AB_UMSB
Page: 0x0%20
where:
% = 2×(DDC channel #)+1
Address: 0x27
READ ONLY
BIT 15
BIT 8
pmeter_result_a(54:48)
0
0
0
0
0
0
0
BIT 7
0
BIT 0
pmeter_result_b(54:48)
0
0
0
0
0
0
0
0
pmeter_result_a(54:48) : Most Significant 7 bits of the 55-bit UMTS or CDMA mode A channel power
measurement.
pmeter_result_b(54:48) : Most Significant 7 bits of the 55-bit CDMA mode B channel power
measurement.
GC5018 GENERAL CONTROL
121
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
5
GC5018 PINS
5.1
Digital Receive Section Signals
Ball
Type
rxclk
Signal Name
U8
input
receive digital section clock input
adcclk_a
B10
input
rxin_a_x input clock
adcclk_b
A10
input
rxin_b_x input clock
adcclk_c
F2
input
rxin_c_x input clock
adcclk_d
E4
input
rxin_d_x input clock
rxin_a_ovr
B16
input
adc overflow/overrange bit for rxin_a
rxin_b_ovr
C9
input
adc overflow/overrange bit for rxin_b
rxin_c_ovr
A3
input
adc overflow/overrange bit for rxin_c
rxin_d_ovr
E1
input
adc overflow/overrange bit for rxin_d
dvga_a_5
A17
output
Digital VGA control output for ADC0 MSB
dvga_a_4
B17
output
Digital VGA control output for ADC0
dvga_a_3
C16
output
Digital VGA control output for ADC0
dvga_a_2
C17
output
Digital VGA control output for ADC0
dvga_a_1
D16
output
Digital VGA control output for ADC0
dvga_a_0
D17
output
Digital VGA control output for ADC0 LSB
dvga_b_5
B18
output
Digital VGA control output for ADC1 MSB
dvga_b_4
E16
output
Digital VGA control output for ADC1
dvga_b_3
E17
output
Digital VGA control output for ADC1
dvga_b_2
C18
output
Digital VGA control output for ADC1
dvga_b_1
D15
output
Digital VGA control output for ADC1
dvga_b_0
D18
output
Digital VGA control output for ADC1 LSB
dvga_c_5
M1
output
Digital VGA control output for rxin_c MSB, test bus bit 1
dvga_c_4
L2
output
Digital VGA control output for rxin_c, test bus bit 0
dvga_c_3
L3
output
Digital VGA control output for rxin_c, test bus bit 19
dvga_c_2
M4
output
Digital VGA control output for rxin_c, test bus bit 18
dvga_c_1
N4
output
Digital VGA control output for rxin_c, test bus CLK
dvga_c_0
M2
output
Digital VGA control output for rxin_c LSB, test bus SYNC
dvga_d_5
M3
output
Digital VGA control output for rxin_d MSB, test bus AFLAG
dvga_d_4
P1
output
Digital VGA control output for rxin_d
dvga_d_3
P4
output
Digital VGA control output for rxin_d
dvga_d_2
N2
output
Digital VGA control output for rxin_d
dvga_d_1
R1
output
Digital VGA control output for rxin_d
dvga_d_0
N3
output
Digital VGA control output for rxin_d LSB
rxin_a_15
C15
input
receive input data bus a bit 15 (MSB)
rxin_a_14
B15
input
receive input data bus a
rxin_a_13
C14
input
receive input data bus a
122
GC5018 PINS
Description
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Ball
Type
rxin_a_12
Signal Name
B14
input
receive input data bus a
Description
rxin_a_11
A16
input
receive input data bus a
rxin_a_10
A15
input
receive input data bus a
rxin_a_9
C13
input
receive input data bus a
rxin_a_8
B13
input
receive input data bus a
rxin_a_7
A14
input
receive input data bus a
rxin_a_6
C12
input
receive input data bus a
rxin_a_5
B12
input
receive input data bus a
rxin_a_4
A12
input
receive input data bus a
rxin_a_3
C11
input
receive input data bus a
rxin_a_2
B11
input
receive input data bus a
rxin_a_1
D11
input
receive input data bus a
rxin_a_0
C10
input
receive input data bus a bit 0 (LSB)
rxin_b_15
B9
input
receive input data bus b bit 15 (MSB)
rxin_b_14
D9
input
receive input data bus b
rxin_b_13
A9
input
receive input data bus b
rxin_b_12
C8
input
receive input data bus b
rxin_b_11
B8
input
receive input data bus b
rxin_b_10
D8
input
receive input data bus b
rxin_b_9
C7
input
receive input data bus b
rxin_b_8
B7
input
receive input data bus b
rxin_b_7
A7
input
receive input data bus b
rxin_b_6
B6
input
receive input data bus b
rxin_b_5
C6
input
receive input data bus b
rxin_b_4
A5
input
receive input data bus b
rxin_b_3
B5
input
receive input data bus b
rxin_b_2
C5
input
receive input data bus b
rxin_b_1
A4
input
receive input data bus b
rxin_b_0
B4
input
receive input data bus b bit 0 (LSB)
rxin_c_15
A2
input/output
receive input data bus c bit 15 (MSB), test bus bit 17
rxin_c_14
B3
input/output
receive input data bus c bit 14, test bus bit 16
rxin_c_13
B2
input/output
receive input data bus c bit 13, test bus bit 15
rxin_c_12
C3
input/output
receive input data bus c bit 12, test bus bit 14
rxin_c_11
C2
input/output
receive input data bus c bit 11, test bus bit 13
rxin_c_10
A1
input/output
receive input data bus c bit 10, test bus bit 12
rxin_c_9
D3
input/output
receive input data bus c bit 9, test bus bit 11
rxin_c_8
D2
input/output
receive input data bus c bit 8, test bus bit 10
rxin_c_7
B1
input/output
receive input data bus c bit 7, test bus bit 9
rxin_c_6
C4
input/output
receive input data bus c bit 6, test bus bit 8
rxin_c_5
E3
input/output
receive input data bus c bit 5, test bus bit 7
rxin_c_4
C1
input/output
receive input data bus c bit 4, test bus bit 6
rxin_c_3
E2
input/output
receive input data bus c bit 3, test bus bit 5
rxin_c_2
D4
input/output
receive input data bus c bit 2, test bus bit 4
rxin_c_1
D1
input/output
receive input data bus c bit 1, test bus bit 3
rxin_c_0
F3
input/output
receive input data bus c bit 0 (LSB), test bus bit 2
rxin_d_15
G3
input/output
receive input data bus d bit 15 (MSB), test bus bit 35
GC5018 PINS
123
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Signal Name
Ball
Type
G2
input/output
receive input data bus d bit 14, test bus bit 34
rxin_d_13
F4
input/output
receive input data bus d bit 13, test bus bit 33
rxin_d_12
G4
input/output
receive input data bus d bit 12, test bus bit 32
rxin_d_11
G1
input/output
receive input data bus d bit 11, test bus bit 31
rxin_d_10
H3
input/output
receive input data bus d bit 10, test bus bit 30
rxin_d_9
H2
input/output
receive input data bus d bit 9, test bus bit 29
rxin_d_8
H4
input/output
receive input data bus d bit 8, test bus bit 28
rxin_d_7
J3
input/output
receive input data bus d bit 7, test bus bit 27
rxin_d_6
J2
input/output
receive input data bus d bit 6, test bus bit 26
rxin_d_5
J1
input/output
receive input data bus d bit 5, test bus bit 25
rxin_d_4
K1
input/output
receive input data bus d bit 4, test bus bit 24
rxin_d_3
K2
input/output
receive input data bus d bit 3, test bus bit 23
rxin_d_2
K3
input/output
receive input data bus d bit 2, test bus bit 22
rxin_d_1
K4
input/output
receive input data bus d bit 1, test bus bit 21
rxin_d_0
L4
input/output
receive input data bus d bit 0 (LSB), test bus bit 20
rx_synca
T8
input
receive sync input
rx_syncb
V10
input
receive sync input
rx_syncc
R10
input
receive sync input
rx_syncd
U9
input
receive sync input
rx_sync_out
U16
output
receive general purpose output sync
rxclk_out
U17
output
receive clock output
rx_sync_out_7
U15
output
receive serial interface frame strobe for rxout_7_x
rx_sync_out_6
T18
output
receive serial interface frame strobe for rxout_6_x, frame strobe (rx_sync_out signal) for
parallel interface.
rx_sync_out_5
P15
output
receive serial interface frame strobe for rxout_5_x
rx_sync_out_4
M15
output
receive serial interface frame strobe for rxout_4_x
rx_sync_out_3
K16
output
receive serial interface frame strobe for rxout_3_x
rx_sync_out_2
J16
output
receive serial interface frame strobe for rxout_2_x
rx_sync_out_1
G15
output
receive serial interface frame strobe for rxout_1_x
rx_sync_out_0
E15
output
receive serial interface frame strobe for rxout_0_x
rxout_7_a
R16
output
DDC 7 serial out data. CDMA A: I data UMTS: Imsb DDC Parallel Interface I(12)
rxout_7_b
R17
output
DDC 7 serial out data. CDMA B: I data UMTS: Imsb – 1 DDC Parallel Interface I(13)
rxout_7_c
U18
output
DDC 7 serial out data. CDMA A: Q data UMTS: Qmsb DDC Parallel Interface I(14)
rxout_7_d
P16
output
DDC 7 serial out data. CDMA B: Q data UMTS: Qmsb –1 DDC Parallel Interface I(15)
rxout_6_a
P17
output
DDC 6 serial out data. CDMA A: I data UMTS: Imsb DDC Parallel Interface I(8)
rxout_6_b
T15
output
DDC 6 serial out data. CDMA B: I data UMTS: Imsb – 1 DDC Parallel Interface I(9)
rxout_6_c
R15
output
DDC 6 serial out data. CDMA A: Q data UMTS: Qmsb DDC Parallel Interface I(10)
rxout_6_d
N16
output
DDC 6 serial out data. CDMA B: Q data UMTS: Qmsb –1 DDC Parallel Interface I(11)
rxout_5_a
N17
output
DDC 5 serial out data. CDMA A: I data UMTS: Imsb Parallel Interface I(4)
rxout_5_b
R18
output
DDC 5 serial out data. CDMA B: I data UMTS: Imsb – 1 Parallel Interface I(5)
rxout_5_c
P18
output
DDC 5 serial out data. CDMA A: Q data UMTS: Qmsb Parallel Interface I(6)
rxout_5_d
M16
output
DDC 5 serial out data. CDMA B: Q data UMTS: Qmsb –1 Parallel Interface I(7)
rxin_d_14
124
GC5018 PINS
Description
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Signal Name
Ball
Type
Description
rxout_4_a
M17
output
DDC 4 serial out data. CDMA A: I data UMTS: Imsb Parallel Interface I(0)
rxout_4_b
N15
output
DDC 4 serial out data. CDMA B: I data UMTS: Imsb – 1 Parallel Interface I(1)
rxout_4_c
L16
output
DDC 4 serial out data. CDMA A: Q data UMTS: Qmsb Parallel Interface I(2)
rxout_4_d
L17
output
DDC 4 serial out data. CDMA B: Q data UMTS: Qmsb –1 Parallel Interface I(3)
rxout_3_a
M18
output
DDC 3 serial out data. CDMA A: I data UMTS: Imsb Parallel Interface Q(12)
rxout_3_b
L15
output
DDC 3 serial out data. CDMA B: I data UMTS: Imsb – 1 Parallel Interface Q(13)
rxout_3_c
K17
output
DDC 3 serial out data. CDMA A: Q data UMTS: Qmsb Parallel Interface Q(14)
rxout_3_d
K18
output
DDC 3 serial out data. CDMA B: Q data UMTS: Qmsb –1 Parallel Interface Q(15)
rxout_2_a
J18
output
DDC 2 serial out data. CDMA A: I data UMTS: Imsb Parallel Interface Q(8)
rxout_2_b
J17
output
DDC 2 serial out data. CDMA B: I data UMTS: Imsb – 1 Parallel Interface Q(9)
rxout_2_c
H15
output
DDC 2 serial out data. CDMA A: Q data UMTS: Qmsb Parallel Interface Q(10)
rxout_2_d
G18
output
DDC 2 serial out data. CDMA B: Q data UMTS: Qmsb –1 Parallel Interface Q(11)
rxout_1_a
H17
output
DDC 1 serial out data. CDMA A: I data UMTS: Imsb Parallel Interface Q(4)
rxout_1_b
H16
output
DDC 1 serial out data. CDMA B: I data UMTS: Imsb – 1 Parallel Interface Q(5)
rxout_1_c
F15
output
DDC 1 serial out data. CDMA A: Q data UMTS: Qmsb Parallel Interface Q(6)
rxout_1_d
G17
output
DDC 1 serial out data. CDMA B: Q data UMTS: Qmsb –1 Parallel Interface Q(7)
rxout_0_a
G16
output
DDC 0 serial out data. CDMA A: I data UMTS: Imsb Parallel Interface Q(0)
rxout_0_b
E18
output
DDC 0 serial out data. CDMA B: I data UMTS: Imsb – 1 Parallel Interface Q(1)
rxout_0_c
F17
output
DDC 0 serial out data. CDMA A: Q data UMTS: Qmsb Parallel Interface Q(2)
rxout_0_d
F16
output
DDC 0 serial out data. CDMA B: Q data UMTS: Qmsb –1 Parallel Interface Q(3)
GC5018 PINS
125
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
5.2
Microprocessor Signals
Ball
Type
d0
Signal Name
V3
input/output
MPU register interface data bus bit 0 (LSB)
d1
U3
input/output
MPU register interface data bus
d2
V2
input/output
MPU register interface data bus
d3
U2
input/output
MPU register interface data bus
d4
T3
input/output
MPU register interface data bus
d5
T2
input/output
MPU register interface data bus
d6
V4
input/output
MPU register interface data bus
d7
R3
input/output
MPU register interface data bus
d8
U4
input/output
MPU register interface data bus
d9
R2
input/output
MPU register interface data bus
d10
U1
input/output
MPU register interface data bus
d11
P3
input/output
MPU register interface data bus
d12
T4
input/output
MPU register interface data bus
d13
T1
input/output
MPU register interface data bus
d14
P2
input/output
MPU register interface data bus
d15
R4
input/output
MPU register interface data bus bit 15 (MSB)
a0
V7
input
MPU register interface address bus bit 0 (LSB)
a1
T6
input
MPU register interface address bus
a2
U6
input
MPU register interface address bus
a3
V5
input
MPU register interface address bus
a4
T5
input
MPU register interface address bus
a5
U5
input
MPU register interface address bus bit 5 (MSB)
rd_n
T7
input
MPU register interface read – active low
wr_n
V9
input
MPU register interface write – active low
ce_n
U7
input
MPU register interface chip enable – active low
reset_n
R9
input
chip reset – active low
interrupt
T9
output
126
GC5018 PINS
Description
chip interrupt
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
5.3
JTAG Signals
Signal Name
Ball
Type
U11
input
JTAG test data in
tms
T11
input
JTAG test mode select
trst_n
U12
input
JTAG test reset (same as trst; the “_n” is for consistency - being active low)
tdi
Description
Note: the trst_n pin should be asserted low after power up to insure the JTAG logic is
properly initialized.
tck
V12
input
tdo
U10
output
5.4
JTAG test clock
JTAG test data out
Factory Test and No Connect Signals
Signal Name
Ball
Type
U14
input
Do not connect; internal pull down
testmode1
T13
input
Do not connect; internal pull down
scanen
U13
input
Do not connect; internal pull down
fa002_scan
V14
input
Do not connect; internal pull down
fa002_clk
V15
input
Do not connect; internal pull down
fa002_out
T12
output
zero
T14
input
fuse_out
V16
output
testmode0
5.5
Description
Do not connect
Do not connect; internal pull down
Do not connect
Power and Ground Signals
Signal Name
Ball
Description
VDDS
A6,
D5, D6, D10, D13, D14,
E5, E13, E14,
F1, F5, F14, F18,
J4, J15,
K15,
L5,
M5,
N5, N14,
P5, P13, P14,
R5, R6, R7, R8, R12, R13, R14,
T16,
V6, V17
Digital I/O Power (3.3 V), also called Vpad
DVDD
A13,
D7, D12,
E6, E7, E8, E10, E11, E12,
G5, G14,
H5, H14,
J5, J14,
L14,
M14,
N1, N18,
P6, P7, P8, P10, P11, P12,
V13
Digital Core Power (1.5 V), also called Vcore
GC5018 PINS
127
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
Signal Name
Ball
Description
DVSS
A8, A11,
E9,
F6, F7, F8, F9, F10, F11, F12, F13,
G6, G7, G8, G9, G10, G11, G12, G13,
H1, H6, H7, H12, H13, H18
J6, J7, J12, J13,
K5, K6, K7, K12, K13, K14,
L1, L6, L7, L12, L13, L18,
M6, M7, M8, M9, M10, M11, M12, M13,
N6, N7, N8, N9, N10, N11, N12, N13,
T17,
P9,
V8, V11
Digital Ground
5.6
Digital Supply Monitoring
Signal Name
Ball
Description
dvddmon
T10
It is recommended that this pin be brought to a probe point for monitoring and debugging purposes.
dvssmon
R11
It is recommended that this pin be brought to a probe point for monitoring and debugging purposes.
5.7
JTAG
The JTAG standard for boundary scan testing will be implemented for board testing purposes. Internal
scan test will not be supported. Five device pins are dedicated for JTAG support: tdi, tdo, tms, tck, and
trst_n. The JTAG bsdl configuration file is available at www.ti.com.
NOTE
The trst_n pin should be asserted after power up to insure the JTAG logic is properly
initialized.
6
SPECIFICATIONS
NOTE: These numbers are engineering estimates prior to first silicon. They will change after we have
characterized the parts.
ABSOLUTE MAXIMUM RATINGS (1)
6.1
UNIT
VDDS
Pad ring supply voltage
DVDD
Core supply voltage
– 0.3 V to 1.8 V
Digital input voltage
– 0.3 V to VDDS+0.3 V
Clamp current for an input or output
–0.3 V to 3.7 V
– 20 mA to +20 mA
TSTG
Storage temperature
– 65°C to 140°C
TJ
Junction temperature
105°C
Lead soldering temperature (10 seconds)
300°C
Class 2
ESD classification (tested to EIA/JESD22-A114-B)
Class 2
Moisture sensitivity
(1)
128
Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
SPECIFICATIONS
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
6.2
RECOMMENDED OPERATING CONDITIONS
MIN
VDDS
Digital chip, I/O ring supply voltage
DVDD
Digital chip, core supply voltage
NOM
Temperature ambient, no air flow
TJ (2)
Junction temperature
(1)
(2)
UNIT
3.6
V
1.425
1.575
V
Digital chip, supply voltage difference, VDDS – DVDD
TA (1)
MAX
3
–40
2.0
V
85
°C
105
°C
Chips specifications in Tables 6.4 and 6.5 are production tested to 90°C case temperature. QA tests are performed at 85°C.
Thermal management will be required for full rate operation, See table below and Section 8.4. The circuit is designed for junction
temperatures up to 125°C. Sustained operation at elevated temperatures will reduce long-term reliability. Lifetime calculations based on
maximum junction temperature of 105°C.
6.3
THERMAL CHARACTERISTICS (1)
θJA
Theta Junction to Ambient (still air)
15.3
°C/W
θJA2m
Theta Junction to Ambient (2m/s estimated)
12.4
°C/W
θJC
Theta Junction to Case
4.5
°C/W
THERMAL CONDUCTIVITY
(1)
MIN
TYP
MAX
UNIT
Air flow will reduce θJA and is highly recommended.
6.3.1
POWER CONSUMPTION
The maximum power consumption is largely a function of the operating mode of the chip.
IDVDD = proportional to filter lengths, supply, frequency, and number of channels active.
Current consumption on the pad supply is primarily due to the external loads and follows C×V×F. Internal loads
are estimated at 2 pF per pin. Data outputs have a transition density of going from a zero to a one once per four
clocks, while clock outputs transition every cycle. The rx_sync_out_X frame strobes consume negligible power
due to the low transition frequency. In general,
IVDDS = Σ DataPad/4×C×F×V + Σ ClockPad×C×F×V
DC CHARACTERISTICS (1) (2) (3)
6.4
–40°C to 85°C case (unless otherwise noted)
VDDS=3 V to 3.6 V
PARAMETER
VIL
Voltage input low
VIH
Voltage input high
VOL
Voltage output low (IOL = 2 mA) (4)
VOH
Voltage output high (IOH = –2 mA) (4)
MIN
MAX
0.8
2.0
µA) (4)
UNIT
V
V
0.5
V
2.4
VDDS
V
5
35
µA
5
35
µA
20
µA
8
mA
|IPU|
Pullup current (VIN = 0 V) (tdi, tms, trst_n, ce_n, wr_n, rd_n, reset_n ) (nominal 20
|IPD|
Pulldown current (VIN = VDDS) (all other inputs and bidirectionals) (nominal 20 µA) (4)
|IIN|
Leakage current (VIN = 0V or VDDS), Outputs in 3-state condition
ICCQ
Quiescent supply current, IDVDD or IVDDS (VIN = 0 for pads with pulldowns,
VIN = VDDS for inputs with pullups) (4)
CIN
Capacitance for inputs (5)
Typical 5
Typical 5
pF
CBI
Capacitance for bidirectionals (5)
Typical 5
Typical 5
pF
(1)
(2)
(3)
(4)
(5)
(4)
Voltages are measured at low speed. Output voltages are measured with the indicated current load.
Currents are measured at nominal voltages, high temperature (90°C for production test, 85°C for QA).
reset_n and interrupt have no timing specifications since they are asynchronous signals.
die_id pins fa002_out, fa002_clk and fa002_scan will not be specified and are for factory use only.
fuse pin fuse_out will not be specified and is for factory use only.
test pins zero, scanen, testmode0 and testmode1 will not be specified and are for factory use only.
Each part is tested at 90°C case temperature for the given specification. Lots are sample tested at -40°C.
Controlled by design and process and not directly tested.
SPECIFICATIONS
129
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
AC TIMING CHARACATERISTICS (1)
6.5
–40°C to 85°C case supplies across recommended range (unless otherwise noted)
PARAMETER
MIN
TYP MAX
UNIT
160
MHz
FCK
Clock frequency (adcclk_a/b/c/d, rxclk) (2)
tCKL
Clock low period (below VIL) (adcclk_a/b/c/d, rxclk) (2)
2
ns
tCKH
Clock high period (above VIH) (adcclk_a/b/c/d, rxclk) (2)
2
ns
tRF
Clock rise and fall times (VIL to VIH) (adcclk_a/b/c/d,
rxclk) (3)
2
Input setup (rxsync_a/b/c/d) before rxclk rises (2)
Input setup (rxin_a/b/c/d_[0-15] ) before rxclk rises (adc fifo blocks bypassed) (2)
tSU
Input setup (rxin_a/b/c/d_[0-15] ) before adcclk_a/b/c/d rises (adc fifo blocks
2
enabled) (2)
Input hold (rxsync_a/b/c/d) after rxclk rises (2)
ns
2
1
Input hold (rxin_a/b/c/d_[0-15] ) after rxclk rises (adc fifo blocks bypassed) (2)
tHD
ns
2
Input hold (rxin_ a/b/c/d_[0-15] ) after adcclk_a/b/c/d rises (adc fifo blocks
2.5
enabled) (2)
ns
1
tDLY
Data output delay (rx_sync_out_[0-7], rxout_[0-7]_a/b/c/d, rxclk_out, rx_sync_out,
dvga_[a-d]_[5-0]) after rxclk rises. (2)
tOHD
Data output hold (rx_sync_out_[0-7], rxout_[0-7]_a/b/c/d, rxclk_out, rx_sync_out,
dvga_[a-d]_[5-0]) after rxclk rises. (2)
FJCK
JTAG Clock frequency (tck) (2)
tJCKL
JTAG Clock low period (below VIL) (tck) (2)
10
ns
tJCKH
JTAG Clock high period (above VIH) (tck
) (2)
10
ns
tJSU
JTAG Input (tdi or tms) setup before tck goes high (2)
2
ns
tJHD
JTAG Input (tdi or tms) hold time after tck goes high (2)
tJDLY
JTAG output (tdo) delay from falling edge of tck. (2)
tCSU
Control setup during reads or writes
3 pin mode: a[5:0] valid before rd_n, wr_n or ce_n falling edge
2 pin mode: a[5:0] and wr_n valid before ce_n falling edge (2)
tEWCSU
Control setup during writes
3 pin mode: d[15:0] valid before wr_n and ce_n rising edge
2 pin mode: d[15:0] valid before ce_n rising edge (2)
tCHD
Control hold during writes.
3 pin mode: a[5:0] and d[15:0] valid after wr_n and ce_n rise
2 pin mode: a[5:0], d[15:0] and wr_n valid after ce_n rise (2)
tCSPW
Control strobe (ce_n and wr_n low) pulse width during write.
tCDLY
Control output delay ce_n and rd_n low and a[5:0] stable to d[15:0] during read.
MHz
ns
10
(2)
6
ns
10
ns
6
ns
25
ns
(2)
(2)
Control recovery time between reads or writes.
Control end of read to Hi-Z. rd_n and ce_n rise to d[15:0] 3-state
tCOH
Control read d[15:0] output hold time (4)
ICDYN
Core dynamic supply current ,nominal voltages, 160 MHz, (specific conditions, typical app with chip
busy within capability of the tester, high temperature.) (4)
130
ns
ns
10
tHIZ
(2)
(3)
(4)
0.5
40
tREC
(1)
7
(4)
1
25
ns
6
ns
10
ns
ns
1700
mA
Timing is measured from the respective clock at VDDS/2 to input or output at VDDS/2. Output loading is a 50 Ω transmission line whose
delay is calibrated out.
Each part is tested at 90°C case temperature for the given specification. Lots are sample tested at –40°C.
Recommended practice.
Controlled by design and process and not directly tested. Verified on initial part evaluation.
SPECIFICATIONS
GC5018
8-CHANNEL WIDEBAND RECEIVER
www.ti.com
SLWS169A – MAY 2005 – REVISED NOVEMBER 2005
7
Revision History
DATE
REV
?? OCT
05
A
PAGE
SECTION
DESCRIPTION
DC Characterisitcs
Changed Note 1
AC Timing
Characterisitcs
Changed note references at section header
tHD Input hold (rxin_a/b/c/d_[0-15] ) after rxclk rises (adc fifo blocks
bypassed) changed from 2.0 to 2.5 ns min
tDLY changed from 6.5 ns to 7.0 ns
tJSU JTAG input (tdi or tms) setup from 1.0 ns to 2.0 ns min
tCSPW control strobe pulse width during write from 15 ns to 25 ns min
tHIZ control end of read Hi-Z needs note (4) instead of note (1)
tCOH control read d(15:0) hold time from 3 ns to 1 ns, and note changed
from (1) to (4)
ICDYN needs to be 1700 mA typical (not a maximum, but a typical value) and
note changed from (1) to (4)
25 MAR
05
*
–
–
Original version
Revision History
131
PACKAGE OPTION ADDENDUM
www.ti.com
14-Nov-2005
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
GC5018IZDL
ACTIVE
BGA
ZDL
Pins Package Eco Plan (2)
Qty
305
84
Pb-Free
(RoHS)
Lead/Ball Finish
SNAGCU
MSL Peak Temp (3)
Level-3-260C-168 HR
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
Addendum-Page 1
IMPORTANT NOTICE
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,
enhancements, improvements, and other changes to its products and services at any time and to discontinue
any product or service without notice. Customers should obtain the latest relevant information before placing
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms
and conditions of sale supplied at the time of order acknowledgment.
TI warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI
deems necessary to support this warranty. Except where mandated by government requirements, testing of all
parameters of each product is not necessarily performed.
TI assumes no liability for applications assistance or customer product design. Customers are responsible for
their products and applications using TI components. To minimize the risks associated with customer products
and applications, customers should provide adequate design and operating safeguards.
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,
copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process
in which TI products or services are used. Information published by TI regarding third-party products or services
does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.
Use of such information may require a license from a third party under the patents or other intellectual property
of the third party, or a license from TI under the patents or other intellectual property of TI.
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without
alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction
of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for
such altered documentation.
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that
product or service voids all express and any implied warranties for the associated TI product or service and
is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.
Following are URLs where you can obtain information on other Texas Instruments products and application
solutions:
Products
Applications
Amplifiers
amplifier.ti.com
Audio
www.ti.com/audio
Data Converters
dataconverter.ti.com
Automotive
www.ti.com/automotive
DSP
dsp.ti.com
Broadband
www.ti.com/broadband
Interface
interface.ti.com
Digital Control
www.ti.com/digitalcontrol
Logic
logic.ti.com
Military
www.ti.com/military
Power Mgmt
power.ti.com
Optical Networking
www.ti.com/opticalnetwork
Microcontrollers
microcontroller.ti.com
Security
www.ti.com/security
Mailing Address:
Telephony
www.ti.com/telephony
Video & Imaging
www.ti.com/video
Wireless
www.ti.com/wireless
Texas Instruments
Post Office Box 655303 Dallas, Texas 75265
Copyright  2006, Texas Instruments Incorporated