ZARLINK MT90823

MT90823
3 V Large Digital Switch
Data Sheet
Features
July 2005
•
2,048 × 2,048 channel non-blocking switching at
8.192 Mb/s
•
Per-channel variable or constant throughput
delay
•
Automatic identification of ST-BUS/GCI interfaces
•
Accept ST-BUS streams of 2.048, 4.096 or
8.192 Mb/s
•
Automatic frame offset delay measurement
•
Per-stream frame delay offset programming
•
Per-channel high impedance output control
Applications
•
Per-channel message mode
•
Medium and large switching platforms
•
Control interface compatible to Motorola nonmultiplexed CPUs
•
CTI application
•
Connection memory block programming
•
Voice/data multiplexer
•
3.3 V local I/O with 5 V tolerant inputs and TTLcompatible outputs
•
Digital cross connects
•
ST-BUS/GCI interface functions
•
IEEE-1149.1 (JTAG) Test Port
•
Support IEEE 802.9a standard
VDD VSS
TMS
TDI
Ordering Information
MT90823AP
84 Pin PLCC
MT90823AL
100 Pin MQFP
MT90823AB
100 Pin LQFP
MT90823AG
120 Pin BGA
MT90823AB1 100 Pin LQFP*
MT90823AP1 84 Pin PLCC*
MT90823AL1
100 Pin MQFP*
*Pb Free Matte Tin
Tubes
Trays
Trays
Trays
Trays
Tubes
Trays
-40°C to +85°C
TDO
TCK
TRST
IC
RESET
ODE
Test Port
STi0
STi1
STi2
STi3
STi4
STi5
STi6
STi7
STi8
STi9
STi10
STi11
STi12
STi13
STi14
STi15
Loopback
Serial
Parallel
to
Parallel
Output
MUX
Multiple Buffer
Data Memory
Converter
Converter
Connection
Memory
Internal
Registers
Timing
Unit
CLK
F0i
to
Serial
FE/ WFPS
HCLK
Microprocessor Interface
AS/ IM DS/ CS R/W
ALE
RD
/WR
A7-A0 DTA D15-D8/ CSTo
AD7-AD0
Figure 1 - Functional Block Diagram
1
Zarlink Semiconductor Inc.
Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.
Copyright 2003-2005, Zarlink Semiconductor Inc. All Rights Reserved.
STo0
STo1
STo2
STo3
STo4
STo5
STo6
STo7
STo8
STo9
STo10
STo11
STo12
STo13
STo14
STo15
MT90823
Data Sheet
Description
The MT90823 Large Digital Switch has a non-blocking switch capacity of: 2,048 x 2,048 channels at a serial bit rate
of 8.192 Mb/s; 1,024 x 1,024 channels at 4.096 Mb/s; and 512 x 512 channels at 2.048 Mb/s. The device has many
features that are programmable on a per stream or per channel basis, including message mode, input offset delay
and high impedance output control.
Per stream input delay control is particularly useful for managing large multi-chip switches that transport both voice
channel and concatenated data channels.
In addition, the input stream can be individually calibrated for input frame offset using a dedicated pin.
2
Zarlink Semiconductor Inc.
MT90823
VSS
STo15
STo14
STo13
STo12
STo11
STo10
STo9
STo8
VDD
VSS
STo7
STo6
STo5
STo4
STo3
STo2
STo1
STo0
ODE
VSS
Data Sheet
STi0
STi1
STi2
STi3
STi4
STi5
STi6
STi7
STi8
STi9
STi10
STi11
STi12
STi13
STi14
STi15
F0i
FE/HCLK
VSS
CLK
VDD
8
10
6
4
2
84
82
80
78
76
13
73
15
71
17
69
19
67
21
CSTo
DTA
D15
D14
D13
D12
D11
D10
D9
D8
VSS
VDD
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
VSS
65
84 PIN PLCC
23
63
25
61
27
59
29
57
31
55
36
38
40
42
44
46
48
50
52
NC
NC
NC
NC
VSS
STo15
STo14
STo13
STo12
STo11
STo10
STo9
STo8
VDD
VSS
STo7
STo6
STo5
STo4
STo3
STo2
STo1
STo0
ODE
VSS
CSTo
NC
NC
NC
NC
TMS
TDI
TDO
TCK
TRST
IC
RESET
WFPS
A0
A1
A2
A3
A4
A5
A6
A7
DS/RD
R/W/RW
CS
AS/ALE
IM
34
80
78
76
74
72
70
68
66
64
62
60
58
56
54
52 50
82
48
84
46
86
44
88
42
100 PIN MQFP
90
40
(14mm x 20mm x 2.75mm)
92
38
94
36
96
34
98
99
32
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
NC
NC
NC
NC
VDD
TMS
TDI
TDO
TCK
TRST
IC
RESET
WFPS
A0
A1
A2
A3
A4
A5
A6
A7
DS/RD
R/W/RW
CS
AS/ALE
IM
NC
NC
NC
NC
STi0
STi1
STi2
STi3
STi4
STi5
STi6
STi7
STi8
STi9
STi10
STi11
STi12
STi13
STi14
STi15
F0i
FE/HCLK
VSS
CLK
Figure 2 - PLCC and MQFP Pin Connections
3
Zarlink Semiconductor Inc.
DTA
D15
D14
D13
D12
D11
D10
D9
D8
VSS
VDD
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
VSS
MT90823
1
A
B
C
D
E
F
G
H
J
4
5
6
7
Data Sheet
1
2
3
8
VSS
VSS
STo14 STo12STo10 STo9 STo7 STo5 STo4 STo2 STo0 VSS
VSS
VSS
VSS
STo15 STo13STo11 STo8 VSS
STo6 STo3 STo1 ODE VSS
VSS
STi0
STi1 VSS
VDD VSS VDD VSS DTA
CSTo
STi2
STi3 VDD
STi4
STi5 VSS
VDD VSS
VDD VSS
9
10
11
12
13
VDD D14
D15
VSS D12
D13
VDD D10
D11
VSS D8
D9
VDD AD6
AD7
STi12 STi13 VSS
VSS AD4
AD5
STi14 STi15 VDD
VDD AD2
AD3
TOP VIEW
STi6
STi7 VDD
PBGA
STi8
STi9 VSS
(23mm x 23mm x 2.13mm)
(Ball Pitch = 1.5mm)
STi10 STi11 VDD
K
L
VSS
F0i FE/HCLK
VDD VSS
VDD VSS
VDD VSS VDD VSS AD0
AD1
TCK IC
WFPS A1
A4
A6
VSS
A3
A5
M
TDI
VSS
VSS
CLK
TMS TDO TRST RESETA0
R/W/RWAS/ALEVSS
N
A7
DS/RD CS
IM
- A1 corner is identified by metallized markings.
NC
NC
VSS
STo15
STo14
STo13
STo12
STo11
STo10
STo9
STo8
VDD
VSS
STo7
STo6
STo5
STo4
STo3
STo2
STo1
STo0
ODE
VSS
NC
NC
1
A2
74
72
70
68
66
64
62
60
58
56
54
52
76
50
78
48
80
46
82
44
84
42
86
100 PIN LQFP
40
88
(14mm x 14mm x 1.4mm)
(Pin Pitch = 0.50mm)
38
90
36
92
34
94
32
96
30
98
28
100
26
2
4
6
8
10
12
14
16
18
20
22
24
NC
NC
TMS
TDI
TDO
TCK
TRST
IC
RESET
WFPS
A0
A1
A2
A3
A4
A5
A6
A7
DS/RD
R/W/RW
CS
AS/ALE
IM
NC
NC
NC
NC
STi0
STi1
STi2
STi3
STi4
STi5
STi6
STi7
STi8
STi9
STi10
STi11
STi12
STi13
STi14
STi15
F0i
FE/HCLK
VSS
CLK
VDD
NC
NC
Figure 3 - PBGA and LQFP Pin Connections
4
Zarlink Semiconductor Inc.
NC
NC
CSTo
DTA
D15
D14
D13
D12
D11
D10
D9
D8
VSS
VDD
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
VSS
NC
NC
MT90823
Data Sheet
Pin Description
Pin #
Name
Description
84
100
PLCC MQFP
100
LQFP
120
BGA
1, 11, 31, 41,
30, 54 56, 66,
64, 75 76, 99
28,
38,
53,
63,
73,
96
A1,A2,A12,A13,
B1,B2,B7,B12,
B13,C3,C5,C7,
C9,C11,E3,E11
G3,G11,J3,J11,
L3,L5,L7,L9,L11,
M1,M2,M12,M13
VSS
Ground.
VDD
+3.3 Volt Power Supply.
2, 32,
63
5, 40,
67
37,
64,98
C4,C6,C8,C10,
D3,D11,F3,F11,
H3,H11,K3,K11,
L4,L6,L8,L10
3 - 10
68-75
65 72
B6,A6,A5,B5,A4,
B4,A3,B3
STo8 - 15 ST-BUS Output 8 to 15 (5 V Tolerant Three-state
Outputs): Serial data Output stream. These streams
may have data rates of 2.048, 4.096 or 8.192 Mb/s,
depending upon the value programmed at bits DR0 - 1
in the IMS register.
12 27
81-96
78 93
C1,C2,D1,D2,E1,
E2,F1,F2,G1,G2,
H1,H2,J1,J2,K1,
K2
STi0 - 15
ST-BUS Input 0 to 15 (5 V Tolerant Inputs): Serial
data input stream. These streams may have data rates
of 2.048, 4.096 or 8.192 Mb/s, depending upon the
value programmed at bits DR0 - 1 in the IMS register.
28
97
94
L1
F0i
Frame Pulse (5 V Tolerant Input): When the WFPS
pin is low, this input accepts and automatically
identifies frame synchronization signals formatted
according to ST-BUS and GCI specifications. When the
WFPS pin is high, this pin accepts a negative frame
pulse which conforms to WFPS formats.
29
98
95
L2
31
100
97
N1
CLK
Clock (5 V Tolerant Input): Serial clock for shifting
data in/out on the serial streams (STi/o 0 - 15).
Depending upon the value programmed at bits DR0 - 1
in the IMS register, this input accepts a 4.096, 8.192 or
16.384 MHz clock.
33
6
3
N2
TMS
Test Mode Select (3.3 V Input with internal pull-up):
JTAG signal that controls the TAP controller state
transitions.
34
7
4
M3
TDI
Test Serial Data In (3.3 V Tolerant Input with internal
pull-up): JTAG serial test instructions and data are
shifted in on this pin.
FE/HCLK Frame Evaluation / HCLK Clock (5 V Tolerant
Input): When the WFPS pin is low, this pin is the frame
measurement input. When the WFPS pin is high, the
HCLK (4.096MHz clock) is required for frame
alignment in the wide frame pulse (WFP) mode.
5
Zarlink Semiconductor Inc.
MT90823
Data Sheet
Pin Description (continued)
Pin #
84
100
PLCC MQFP
100
LQFP
120
BGA
Name
Description
35
8
5
N3
TDO
Test Serial Data Out (3.3 V Output): JTAG serial data
is output on this pin on the falling edge of TCK. This pin
is held in high impedance state when JTAG scan is not
enabled.
36
9
6
M4
TCK
Test Clock (5 V Tolerant Input): Provides the clock to
the JTAG test logic.
37
10
7
N4
TRST
Test Reset (3.3 V Input with internal pull-up):
Asynchronously initializes the JTAG TAP controller by
putting it in the Test-Logic-Reset state. This pin should
be pulsed low on power-up, or held low, to ensure that
the MT90823 is in the normal functional mode.
38
11
8
M5
IC
Internal Connection (3.3 V Input with internal pulldown): Connect to VSS for normal operation. This pin
must be low for the MT90823 to function normally and
to comply with IEEE 1149 (JTAG) boundary scan
requirements.
39
12
9
N5
RESET
Device Reset (5 V Tolerant Input): This input (active
LOW) puts the MT90823 in its reset state to clear the
device internal counters, registers and bring STo0 - 15
and microport data outputs to a high impedance state.
The time constant for a power up reset circuit must be a
minimum of five times the rise time of the power supply.
In normal operation, the RESET pin must be held low
for a minimum of 100 nsec to reset the device.
40
13
10
M6
WFPS
Wide Frame Pulse Select (5 V Tolerant Input): When
1, enables the wide frame pulse (WFP) Frame
Alignment interface. When 0, the device operates in
ST-BUS/GCI mode.
41 48
14-21
11 18
N6,M7,N7,N8,
M8,N9,M9,N10
A0 - A7
Address 0 - 7 (5 V Tolerant Input): When nonmultiplexed CPU bus operation is selected, these lines
provide the A0 - A7 address lines to the internal
memories.
49
22
19
N11
DS/RD
Data Strobe / Read (5 V Tolerant Input): For Motorola
multiplexed bus operation, this input is DS. This active
high DS input works in conjunction with CS to enable
the read and write operations.
For Motorola non-multiplexed CPU bus operation, this
input is DS. This active low input works in conjunction
with CS to enable the read and write operations.
For multiplexed bus operation, this input is RD. This
active low input sets the data bus lines (AD0-AD7, D8D15) as outputs.
6
Zarlink Semiconductor Inc.
MT90823
Data Sheet
Pin Description (continued)
Pin #
84
100
PLCC MQFP
100
LQFP
120
BGA
Name
Description
50
23
20
M10
R/W / WR Read/Write / Write (5 V Tolerant Input): In the cases
of Motorola non-multiplexed and multiplexed bus
operations, this input is R/W. This input controls the
direction of the data bus lines (AD0 - AD7, D8-D15)
during a microprocessor access.
For multiplexed bus operation, this input is WR. This
active low input is used with RD to control the data bus
(AD0 - 7) lines as inputs.
51
24
21
N12
CS
52
25
22
M11
AS/ALE
Address Strobe or Latch Enable (5 V Tolerant
Input): This input is used if multiplexed bus operation
is selected via the IM input pin. For Motorola nonmultiplexed bus operation, connect this pin to ground.
53
26
23
N13
IM
CPU Interface Mode (5 V Tolerant Input): When IM is
high, the microprocessor port is in the multiplexed
mode. When IM is low, the microprocessor port is in
non-multiplexed mode.
55 62
32-39
29 36
L12,L13,K12,
K13,J12,J13,
H12,H13
AD0 - 7
Address/Data Bus 0 to 7 (5 V Tolerant I/O): These
pins are the eight least significant data bits of the
microprocessor port. In multiplexed mode, these pins
are also the input address bits of the microprocessor
port.
65 72
42-49
39 46
G12,G13,F12,
F13,E12,E13,
D12,D13
D8 - 15
Data Bus 8-15 (5 V Tolerant I/O): These pins are the
eight most significant data bits of the microprocessor
port.
73
50
47
C12
DTA
Data Transfer Acknowledgement (5 V tolerant
Three-state Output): Indicates that a data bus transfer
is complete. When the bus cycle ends, this pin drives
HIGH and then tri-states, allowing for faster bus cycles
with a weaker pull-up resistor. A pull-up resistor is
required to hold a HIGH level when the pin is tri-stated.
74
55
48
C13
CSTo
Control Output (5 V Tolerant Output). This is a
4.096, 8.192 or 16.384 Mb/s output containing 512,
1024 or 2048 bits per frame respectively. The level of
each bit is determined by the CSTo bit in the
connection memory. See External Drive Control
Section.
Chip Select (5 V Tolerant Input): Active low input
used by a microprocessor to activate the
microprocessor port of MT90823.
7
Zarlink Semiconductor Inc.
MT90823
Data Sheet
Pin Description (continued)
Pin #
84
100
PLCC MQFP
100
LQFP
120
BGA
Name
Description
76
57
54
B11
ODE
Output Drive Enable (5 V Tolerant Input): This is the
output enable control for the STo0-15 serial outputs.
When ODE input is low and the OSB bit of the IMS
register is low, STo0-15 are in a high impedance state.
If this input is high, the STo0-15 output drivers are
enabled. However, each channel may still be put into a
high impedance state by using the per channel control
bit in the connection memory.
77 84
58-65
55 62
A11,B10,A10,B9,
A9,A8,B8,A7
STo0 - 7
Data Stream Output 0 to 7 (5 V Tolerant Three-state
Outputs): Serial data Output stream. These streams
have selectable data rates of 2.048, 4.096 or
8.192 Mb/s.
-
1 - 4,
27 30,
51 54
77 80
1 - 2,
24 27,
49 52,
74 77,
99 100
NC
No connection.
Device Overview
The MT90823 Large Digital Switch is capable of switching up to 2,048 × 2,048 channels. The MT90823 is designed
to switch 64 kb/s PCM or N x 64 kb/s data. The device maintains frame integrity in data applications and minimum
throughput delay for voice applications on a per channel basis.
The serial input streams of the MT90823 can have a bit rate of 2.048, 4.096 or 8.192 Mbit/s and are arranged in
125 µs wide frames, which contain 32, 64 or 128 channels, respectively. The data rates on input and output
streams are identical.
By using Zarllink’s message mode capability, the microprocessor can access input and output time-slots on a per
channel basis. This feature is useful for transferring control and status information for external circuits or other STBUS devices. The MT90823 automatically identifies the polarity of the frame synchronization input signal and
configures its serial streams to be compatible to either ST-BUS or GCI formats.
Two different microprocessor bus interfaces can be selected through the Input Mode pin (IM): Non-multiplexed or
Multiplexed. These interfaces provide compatibility with multiplexed and Motorola multiplexed/non-multiplexed
buses.
The frame offset calibration function allows users to measure the frame offset delay using a frame evaluation pin
(FE). The input offset delay can be programmed for individual streams using internal frame input offset registers,
see Table 11.
The internal loopback allows the ST-BUS output data to be looped around to the ST-BUS inputs for diagnostic
purposes.
8
Zarlink Semiconductor Inc.
MT90823
Data Sheet
Functional Description
A functional Block Diagram of the MT90823 is shown in Figure 1.
Data and Connection Memory
For all data rates, the received serial data is converted to parallel format by internal serial-to-parallel converters and
stored sequentially in the data memory. Depending upon the selected operation programmed in the interface mode
select (IMS) register, the useable data memory may be as large as 2,048 bytes. The sequential addressing of the
data memory is performed by an internal counter, which is reset by the input 8 kHz frame pulse (F0i) to mark the
frame boundaries of the incoming serial data streams.
Data to be output on the serial streams may come from either the data memory or connection memory. Locations in
the connection memory are associated with particular ST-BUS output channels. When a channel is due to be
transmitted on an ST-BUS output, the data for this channel can be switched either from an ST-BUS input in
connection mode, or from the lower half of the connection memory in message mode. Data destined for a particular
channel on a serial output stream is read from the data memory or connection memory during the previous channel
time-slot. This allows enough time for memory access and parallel-to-serial conversion.
Connection and Message Modes
In the connection mode, the addresses of the input source data for all output channels are stored in the connection
memory. The connection memory is mapped in such a way that each location corresponds to an output channel on
the output streams. For details on the use of the source address data (CAB and SAB bits), see Table 13 and Table
14. Once the source address bits are programmed by the microprocessor, the contents of the data memory at the
selected address are transferred to the parallel-to-serial converters and then onto an ST-BUS output stream.
By having several output channels connected to the same input source channel, data can be broadcasted from one
input channel to several output channels.
In message mode, the microprocessor writes data to the connection memory locations corresponding to the output
stream and channel number. The lower half (8 least significant bits) of the connection memory content is
transferred directly to the parallel-to-serial converter. This data will be output on the ST-BUS streams in every frame
until the data is changed by the microprocessor.
The five most significant bits of the connection memory controls the following for an output channel: message or
connection mode; constant or variable delay; enables/tristate the ST-BUS output drivers; and, enables/disable the
loopback function. In addition, one of these bits allows the user to control the CSTo output.
If an output channel is set to a high-impedance state through the connection memory, the ST-BUS output
will be in a high impedance state for the duration of that channel. In addition to the per-channel control, all channels
on the ST-BUS outputs can be placed in a high impedance state by either pulling the ODE input pin low or
programming the output standby (OSB) bit in the interface mode selection register to low. This action overrides the
individual per-channel programming by the connection memory bits.
The connection memory data can be accessed via the microprocessor interface through the D0 to D15 pins. The
addressing of the device internal registers, data and connection memories is performed through the address input
pins and the Memory Select (MS) bit of the control register. For details on device addressing, see Software Control
and Control Register bits description (Tables 4, 6 and 7).
Serial Data Interface Timing
The master clock frequency must always be twice the data rate. The master clock (CLK) must be either at 4.096,
8.192 or 16.384 MHz for serial data rate of 2.048, 4.096 or 8.192 Mb/s respectively. The input and output stream
data rates will always be identical.
9
Zarlink Semiconductor Inc.
MT90823
Data Sheet
The MT90823 provides two different interface timing modes controlled by the WFPS pin. If the WFPS pin is low, the
MT90823 is in ST-BUS/GCI mode. If the WFPS pin is high, the MT90823 is in the wide frame pulse (WFP) frame
alignment mode.
In ST-BUS/GCI mode, the input 8 kHz frame pulse can be in either ST-BUS or GCI format. The MT90823
automatically detects the presence of an input frame pulse and identifies it as either ST-BUS or GCI. In ST-BUS
format, every second falling edge of the master clock marks a bit boundary and the data is clocked in on the rising
edge of CLK, three quarters of the way into the bit cell, see Figure 11. In GCI format, every second rising edge of
the master clock marks the bit boundary and data is clocked in on the falling edge of CLK at three quarters of the
way into the bit cell, see Figure 12.
Wide Frame Pulse (WFP) Frame Alignment Timing
When the device is in WFP frame alignment mode, the CLK input must be at 16.384 MHz, the FE/HCLK input is
4.096 MHz and the 8 kHz frame pulse is in ST-BUS format. The timing relationship between CLK, HCLK and the
frame pulse is defined in Figure 13.
When the WFPS pin is high, the frame alignment evaluation feature is disabled, but the frame input offset registers
may still be programmed to compensate for the varying frame delays on the serial input streams.
Switching Configurations
The MT90823 maximum non-blocking switching configurations is determined by the data rates selected for the
serial inputs and outputs. The switching configuration is selected by two DR bits in the IMS register. See Table 8 nd
Table 9.
2.048 Mb/s Serial Links (DR0=0, DR1=0)
When the 2.048 Mb/s data rate is selected, the device is configured with 16-input/16-output data streams each
having 32 64 kb/s channels. This mode requires a CLK of 4.094 MHz and allows a maximum non-blocking
capacity of 512 x 512 channels.
4.096 Mb/s Serial Links (DR0=1, DR1=0)
When the 4.096 Mb/s data rate is selected, the device is configured with 16-input/16-output data streams each
having 64 64 kb/s channels. This mode requires a CLK of 8.192 MHz and allows a maximum non-blocking
capacity of 1,024 x 1,024 channels.
8.192 Mb/s Serial Links (DR0=0, DR1=1)
When the 8.192 Mb/s data rate is selected, the device is configured with 16-input/16-output data streams each
having 128 64 kb/s channels. This mode requires a CLK of 16.384 MHz and allows a maximum non-blocking
capacity of 2,048 x 2,048 channels. Table 1 summarizes the switching configurations and the relationship between
different serial data rates and the master clock frequencies.
10
Zarlink Semiconductor Inc.
MT90823
Data Sheet
Serial Interface
Data Rate
Master Clock
Required (MHz)
Matrix Channel
Capacity
2 Mb/s
4.096
512 x 512
4 Mb/s
8.192
1,024 x 1,024
8 Mb/s
16.384
2,048 x 2,048
Table 1 - Switching Configuration
Input Frame Offset Selection
Input frame offset selection allows the channel alignment of individual input streams to be offset with respect to the
output stream channel alignment (i.e., F0i). This feature is useful in compensating for variable path delays caused
by serial backplanes of variable lengths, which may be implemented in large centralized and distributed switching
systems.
Each input stream can have its own delay offset value by programming the frame input offset (FOR) registers.
Possible adjustment can range up to +4 master clock (CLK) periods forward with resolution of 1/2 clock period. The
output frame offset cannot be offset or adjusted. See Figure 4, Table 11 and Table 12 for delay offset programming.
Serial Input Frame Alignment Evaluation
The MT90823 provides the frame evaluation (FE) input to determine different data input delays with respect to the
frame pulse F0i.
A measurement cycle is started by setting the start frame evaluation (SFE) bit low for at least one frame. Then the
evaluation starts when the SFE bit in the IMS register is changed from low to high. Two frames later, the complete
frame evaluation (CFE) bit of the frame alignment register (FAR) changes from low to high. This signals that a valid
offset measurement is ready to be read from bits 0 to 11 of the FAR register. The SFE bit must be set to zero before
starting a new measurement cycle.
In ST-BUS mode, the falling edge of the frame measurement signal (FE) is evaluated against the falling edge of the
ST-BUS frame pulse. In GCI mode, the rising edge of FE is evaluated against the rising edge of the GCI frame
pulse. See Table 10 and Figure 3 for the description of the frame alignment register.
This feature is not available when the WFP Frame Alignment mode is enabled (i.e., when the WFPS pin is
connected to VDD).
Memory Block Programming
The MT90823 provides users with the capability of initializing the entire connection memory block in two frames.
Bits 11 to 15 of every connection memory location will be programmed with the pattern stored in bits 5 to 9 of the
IMS register.
The block programming mode is enabled by setting the memory block program (MBP) bit of the control register
high. When the block programming enable (BPE) bit of the IMS register is set to high, the block programming data
will be loaded into the bits 11 to 15 of every connection memory location. The other connection memory bits (bit 0 to
bit 10) are loaded with zeros. When the memory block programming is complete, the device resets the BPE bit to
zero.
Loopback Control
The loopback control (LPBK) bit of each connection memory location allows the ST-BUS output data to be looped
backed internally to the ST-BUS input for diagnostic purposes.
11
Zarlink Semiconductor Inc.
MT90823
Data Sheet
If the LPBK bit is high, the associated ST-BUS output channel data is internally looped back to the ST-BUS input
channel (i.e., data from STo n channel m will appear in STi n channel M). Note: when LPBK is activated in channel
m STo n+1 (for n even) or STo n-1 (for n odd), the data from channel m of STi n will be switched to channel m STo
n. The associated frame delay offset register must be set to zero for proper operation of the per-channel loopback
function. If the LPBK bit is low, the per-channel loopback feature is disabled and the device will function normally.
Delay Through the MT90823
The switching of information from the input serial streams to the output serial streams results in a throughput delay.
The device can be programmed to perform time-slot interchange functions with different throughput delay
capabilities on a per-channel basis. For voice application, select variable throughput delay to ensure minimum
delay between input and output data. In wideband data applications, select constant throughput delay to maintain
the frame integrity of the information through the switch.
The delay through the device varies according to the type of throughput delay selected in the V/C bit of the
connection memory.
Variable Delay Mode (V/C bit = 0)
The delay in this mode is dependent only on the combination of source and destination channels. It is independent
of input and output streams. The minimum delay achievable in the MT90823 is three time-slots. When the input
channel data is switched to the same output channel (channel n, frame p), it will be output in the following frame
(channel n, frame p+1). The same frame delay occurs if the input channel n is switched to output channel n+1 or
n+2. When input channel n is switched to output channel n+3, n+4,..., the new output data will appear in the same
frame. Table 2 shows the possible delays for the MT90823 in the variable delay mode.
Constant Delay Mode (V/C bit = 1)
In this mode, frame integrity is maintained in all switching configurations by using a multiple data memory buffer.
Input channel data written into the data memory buffers during frame n will be read out during frame n+2.
In the MT90823, the minimum throughput delay achievable in the constant delay mode is one frame. For example,
in 2 Mb/s mode, when input time-slot 31 is switched to output time-slot 0. The maximum delay of 94 time-slots
occurs when time-slot 0 in a frame is switched to time-slot 31 in the frame. See Table 3.
Microprocessor Interface
The MT90823 provides a parallel microprocessor interface for non-multiplexed or multiplexed bus structures. This
interface is compatible with Motorola non-multiplexed and multiplexed buses.
If the IM pin is low, the MT90823 microprocessor interface assumes Motorola non-multiplexed bus mode. If the IM
pin is high, the device micro- processor interface accepts two different timing modes (mode1 and mode2) which
allows direct connection to multiplexed microprocessors.
The microprocessor interface automatically identifies the type of microprocessor bus connected to the MT90823.
This circuit uses the level of the DS/RD input pin at the rising edge of AS/ALE to identify the appropriate bus timing
connected to the MT90823. If DS/RD is high at the falling edge of AS/ALE, then the mode 1 multiplexed timing is
selected. If DS/RD is low at the falling edge of AS/ALE, then the mode 2 multiplexed bus timing is selected.
12
Zarlink Semiconductor Inc.
MT90823
Data Sheet
Delay for Variable Throughput Delay Mode
(m - output channel number)
(n - input channel number))
Input Rate
m<n
m = n, n+1, n+2
m > n+2
2.048 Mb/s
32 - (n-m) time-slots
m-n + 32 time-slots
m-n time-slots
4.096 Mb/s
64 - (n-m) time-slots
m-n + 64 time-slots
m-n time-slots
8.192 Mb/s
128 - (n-m) time-slots
m-n + 128 time-slots
m-n time-slots
Table 2 - Variable Throughput Delay Value
Input Rate
Delay for Constant Throughput Delay Mode
(m - output channel number)
(n - input channel number))
2.048 Mb/s
32 + (32 - n) + (m - 1) time-slots
4.096 Mb/s
64 + (64 - n) + (m- 1) time-slots
8.192 Mb/s
128 + (128 - n) + (m- 1) time-slots
Table 3 - Constant Throughput Delay Value
For multiplexed operation, the 8-bit data and address (AD0-AD7), 8-bit Data (D8-D15), Address strobe/Address
latch enable (AS/ALE), Data strobe/Read (DS/RD), Read/Write /Write (R/W / WR), Chip select (CS) and Data
transfer acknowledge (DTA) signals are required. See Figure 13 and Figure 14 for multiplexed parallel microport
timing.
For the Motorola non-multiplexed bus, the 16-bit data bus (AD0-AD7, D8-D15), 8-bit address bus (A0-A7) and 4
control lines (CS, DS, R/W and DTA) signals are required. See Figure 15 for Motorola non- multiplexed microport
timing.
The MT90823 microport provides access to the internal registers, connection and data memories. All locations
provide read/write access except for the data memory and the frame alignment register which are read only.
Memory Mapping
The address bus on the microprocessor interface selects the MT90823 internal registers and memory. If the A7
address input is low, then the control (CR), interface mode selection (IMS), frame alignment (FAR) and frame input
offset (FOR) registers are addressed by A6 to A0 as shown in Table 4.
If the A7 address input is high, then the remaining address input lines are used to select up to 128 memory
subsection locations. The number selected corresponds to the maximum number of channels per input or output
stream. The address input lines and the stream address bits (STA) of the control register allow access to the entire
data and connection memories.
The control and IMS registers together control all the major functions of the device. The IMS register should be
programmed immediately after system power-up to establish the desired switching configuration (see “Serial Data
Interface Timing” and “Switching Configurations” ).
The control register controls switching operations in the MT90823. It selects the internal memory locations that
specify the input and output channels selected for switching.
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Zarlink Semiconductor Inc.
MT90823
Data Sheet
The data in the control register consists of the memory block programming bit (MBP), the memory select bit (MS)
and the stream address bits (STA). The memory block programming bit allows users to program the entire
connection memory block, (see “Memory Block Programming” ). The memory select bit controls the selection of the
connection memory or the data Memory. The stream address bits define an internal memory subsections
corresponding to input or output ST-BUS streams.
The data in the IMS register consists of block programming bits (BPD0-BPD4), block programming enable bit
(BPE), output standby bit (OSB), start frame evaluation bit (SFE) and data rate selection bits (DR0, DR1). The block
programming and the block programming enable bits allows users to program the entire connection memory, (see
Memory Block Programming section). If the ODE pin is low, the OSB bit enables (if high) or disables (if low) all STBUS output drivers. If the ODE pin is high, the contents of the OSB bit is ignored and all ST-BUS output drivers are
enabled.
Connection Memory Control
The contents of the CSTo bit of each connection memory location are output on the CSTo pin once every frame.
The CSTo pin is a 4.096, 8.192 or 16.384 Mb/s output carrying 512, 1,024 or 2,048 bits respectively. If the CSTo bit
is set high, the corresponding bit on the CSTo output is transmitted high. If the CSTo bit is low, the corresponding bit
on the CSTo output is transmitted low. The contents of the CSTo bits of the connection memory are transmitted
sequentially via the CSTo pin and are synchronous with the data rates on the other ST-BUS streams.
The CSTo bit is output one channel before the corresponding channel on the ST-BUS. For example, in 2 Mb/s
mode, the contents of the CSTo bit in position 0 (STo0, CH0) of the connection memory is output on the first clock
cycle of channel 31 via CSTo pin. The contents of the CSTo bit in position 32 (STo1, CH0) of the connection
memory is output on the second clock cycle of channel 31 via CSTo pin.
When either the ODE pin or the OSB bit is high, the OE bit of each connection memory location enables (if high) or
disables (if low) the output drivers for an individual ST-BUS output stream and channel. Table 5 details this function.
The connection memory message channel (MC) bit (if high) enables message mode in the associated ST-BUS
output channel. When message mode is enabled, only the lower half (8 least significant bits) of the connection
memory is transferred to the ST-BUS outputs.
If the MC bit is low, the contents of the connection memory stream address bit (SAB) and channel address bit
(CAB) defines the source information (stream and channel) of the time-slot that will be switched to the output.
Bit V/C (Variable/Constant Delay) of each connection memory location allows the per-channel selection between
variable and constant throughput delay modes.
The loopback bit should be used for diagnostic purpose only; this bit should be set to zero for normal operation. If
all LPBK bits are set high for all connection memory locations, the associated ST-BUS output channel data is
internally looped back to the ST-BUS input channel (i.e., SToN channel m data loops back to STi N channel m).
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Zarlink Semiconductor Inc.
MT90823
Data Sheet
A7
A6
A5
A4
A3
A2
A1
A0
0
0
0
0
0
0
0
0
Control Register, CR
0
0
0
0
0
0
0
1
Interface Mode Selection Register, IMS
0
0
0
0
0
0
1
0
Frame Alignment Register, FAR
0
0
0
0
0
0
1
1
Frame Input Offset Register 0, FOR0
0
0
0
0
0
1
0
0
Frame Input Offset Register 1, FOR1
0
0
0
0
0
1
0
1
Frame Input Offset Register 2, FOR2
0
0
0
0
0
1
1
0
Frame Input Offset Register 3, FOR3
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
.
1
1
0
0
.
1
1
0
0
.
1
1
0
0
.
1
1
0
1
.
0
1
Ch 0
Ch 1
.
Ch 30
Ch 31
(Note 2)
1
1
1
1
1
0
0
0
0
0
1
1
1
1
1
0
0
.
1
1
0
0
.
1
1
0
0
.
1
1
0
0
.
1
1
0
1
.
0
1
Ch 32
Ch 33
.
Ch 62
Ch 63
(Note 3)
1
1
1
1
1
1
1
1
1
1
0
0
.
1
1
0
0
.
1
1
0
0
.
1
1
0
0
.
1
1
0
0
.
1
1
0
1
.
0
1
Ch 64
Ch 65
.
Ch 126
Ch 127
(Note 1)
Location
(Note 4)
Notes:
1. Bit A7 must be high for access to data and connection memory positions. Bit A7 must be low for access to registers.
2. Channels 0 to 31 are used when serial interface is at 2Mb/s mode.
3. Channels 0 to 63 are used when serial interface is at 4Mb/s mode.
4. Channels 0 to 127 are used when serial interface is at 8Mb/s mode.
Table 4 - Internal Register and Address Memory Mapping
OE bit in Connection
Memory
ODE pin
OSB bit in IMS register
ST-BUS Output Driver Status
0
Don’t Care
Don’t Care
Per Channel
High Impedance
1
0
0
High Impedance
1
0
1
Enable
1
1
Don’t care
Enable
Table 5 - Output High Impedance Control
If the LPBK bit is low, the loopback feature is disabled. For proper per-channel loopback operation, the contents of
the frame delay offset registers must be set to zero.
15
Zarlink Semiconductor Inc.
MT90823
Data Sheet
Initialization of the MT90823
During power up, the TRST pin should be pulsed low, or held low continuously, to ensure that the MT90863 is in the
normal functional mode. A 5K pull-down resistor can be connected to this pin so that the device will not enter the
JTAG test mode during power up.
Upon power up, the contents of the connection memory can be in any state and the ODE pin should be held low to
keep all ST-BUS outputs in a high impedance state until the microprocessor has initialized the switching matrix.
To prevent two ST-BUS outputs from driving the same stream simultaneously, the microprocessor should program
the desired active paths through the switch and put all other channels into a high impedance state during the
initialization routine by using the block programming mode. In addition, the loopback bits in the connection memory
should be cleared for normal operation.
When this process is complete, the microprocessor controlling the matrices can bring the ODE pin or OSB bit high
to relinquish the high impedance state control to the OE bit in the connection memory.
Read/Write Address:
Reset Value:
00H,
0000H.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
0
MBP
MS
STA3
STA2
STA1
STA0
Bit
Name
Description
15 - 6
Unused
5
MBP
Memory Block Program. When 1, the connection memory block programming
feature is ready for the programming of Connection Memory high bits, bit 11 to bit 15.
When 0, this feature is disabled.
4
MS
Memory Select. When 0, connection memory is selected for read or write operations.
When 1, the data memory is selected for read operations and connection memory is
selected for write operations. (No microprocessor write operation is allowed for the
data memory.)
3-0
STA3-0
Stream Address Bits. The binary value expressed by these bits refers to the input or
output data stream, which corresponds to the subsection of memory made accessible
for subsequent operations. (STA3 = MSB, STA0 = LSB)
Must be zero for normal operation.
Table 6 - Control (CR) Register Bits
Input/Output
Data Rate
Valid Address Lines
2.048 Mb/s
A4, A3, A2, A1, A0
4.096 Mb/s
A5, A4, A3, A2, A1, A0
8.192 Mb/s
A6, A5, A4 A3, A2, A1, A0
Table 7 - Valid Address lines for Different Bit Rates
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Zarlink Semiconductor Inc.
MT90823
Read/Write Address:
Reset Value:
Data Sheet
01H,
0000H.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
0
BPD
4
BPD
3
BPD
2
BPD
1
BPD
0
BPE
OSB
SFE
DR1
DR0
Bit
Name
Description
15-10
Unused
Must be zero for normal operation.
9-5
BPD4-0
Block Programming Data. These bits carry the value to be loaded into the
connection memory block whenever the memory block programming feature is
activated. After the MBP bit in the control register is set to 1 and the BPE bit is set to
1, the contents of the bits BPD4- 0 are loaded into bit 15 to bit 11 of the connection
memory. Bit 10 to bit 0 of the connection memory are set to 0.
4
BPE
Begin Block programming Enable. A zero to one transition of this bit enables the
memory block programming function. The BPE and BPD4-0 bits in the IMS register
have to be defined in the same write operation. Once the BPE bit is set high, the
device requires two frames to complete the block programming. After the
programming function has finished, the BPE bit returns to zero to indicate the
operation is completed. When the BPE = 1, the BPE or MBP can be set to 0 to abort
the programming operation.
When BPE = 1, the other bits in the IMS register must not be changed for two frames
to ensure proper operation.
3
OSB
Output standby. When ODE = 0 and OSB = 0, the output drivers of STo0 to STo15
are in high impedance mode. When ODE = 0 and OSB = 1, the output driver of STo0
to STo15 function normally. When ODE = 1, STo0 to STo15 output drivers function
normally.
2
SFE
Start Frame Evaluation. A zero to one transition in this bit starts the frame evaluation
procedure. When the CFE bit in the FAR register changes from zero to one, the
evaluation procedure stops. To start another frame evaluation cycle, set this bit to
zero for at least one frame.
1-0
DR1-0
Data Rate Select. Input/Output data rate selection. See Table 9 for detailed
programming.
Table 8 - Interface Mode Selection (IMS) Register Bits
DR1
DR0
Data Rate Selected
Master Clock Required
0
0
2.048 Mb/s
4.096 MHz
0
1
4.096 Mb/s
8.192 MHz
1
0
8.192 Mb/s
16.384 MHz
1
1
Reserved
Reserved
Table 9 - Serial Data Rate Selection (16 input x 16 output)
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Zarlink Semiconductor Inc.
MT90823
Read Address:
Reset Value:
Data Sheet
02H,
0000H.
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
CFE
FD11
FD10
FD9
FD8
FD7
FD6
FD5
FD4
FD3
FD2
FD1
FD0
Bit
Name
Description
15 - 13
Unused
12
CFE
Complete Frame Evaluation. When CFE = 1, the frame evaluation is
completed and bits FD10 to FD0 bits contains a valid frame alignment offset.
This bit is reset to zero, when SFE bit in the IMS register is changed from 1 to
0.
11
FD11
Frame Delay Bit 11. The falling edge of FE (or rising edge for GCI mode) is
sampled during the CLK-high phase (FD11 = 1) or during the CLK-low phase
(FD11 = 0). This bit allows the measurement resolution to 1/2 CLK cycle.
10 - 0
FD10-0
Frame Delay Bits. The binary value expressed in these bits refers to the
measured input offset value. These bits are reset to zero when the SFE bit of
the IMS register changes from 1 to 0. (FD10 = MSB, FD0 = LSB)
Must be zero for normal operation.
Table 10 - Frame Alignment (FAR) Register Bits
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Zarlink Semiconductor Inc.
MT90823
Data Sheet
ST-BUS Frame
CLK
Offset Value
0
1
2
3
4
5
6
7
8
9
10
11 12
13
14
15
FE Input
(FD[10:0] = 06H)
(FD11 = 0, sample at CLK low phase)
GCI Frame
CLK
Offset Value
0
1
2
3
4
5
6
7
8
9
10
11 12
13
14
15
FE Input
(FD[10:0] = 09H)
(FD11 = 1, sample at CLK high phase)
Figure 4 - Example for Frame Alignment Measurement
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Zarlink Semiconductor Inc.
16
MT90823
Read/Write Address:
Data Sheet
03H for FOR0 register,
04H for FOR1 register,
05H for FOR2 register,
06H for FOR3 register,
0000H for all FOR registers.
Reset value:
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
OF32
OF31
OF30
DLE3
OF22
OF21
OF20
DLE2
OF12
OF11
OF10
DLE1
OF02
OF01
OF00
DLE0
FOR0 register
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
OF72
OF71
OF70
DLE7
OF62
OF61
OF60
DLE6
OF52
OF51
OF50
DLE5
OF42
OF41
OF40
DLE4
FOR1 register
15
14
OF112
13
12
OF111 OF110 DLE11
11
OF102
10
9
8
OF101 OF100 DLE10
7
6
5
4
3
2
1
0
OF92
OF91
OF90
DLE9
OF82
OF81
OF80
DLE8
5
4
3
2
1
0
FOR2 register
15
14
OF152
OF151
13
12
OF150 DLE15
11
OF142
10
9
8
OF141 OF140 DLE14
7
6
OF132 OF131
OF130 DLE13 OF122
OF121 OF120 DLE12
FOR3 register
Name
(Note 1)
OFn2, OFn1, OFn0
DLEn
Description
Offset Bits 2,1 & 0. These three bits define how long the serial interface receiver takes
to recognize and store bit 0 from the STi input pin: i.e., to start a new frame. The input
frame offset can be selected to +4 clock periods from the point where the external
frame pulse input signal is applied to the F0i input of the device. See Figure 4.
Data Latch Edge.
ST-BUS mode:DLEn =0, if clock rising edge is at the 3/4 point of the bit cell.
DLEn =1, if when clock falling edge is at the 3/4 of the bit cell.
GCI mode:DLEn =0, if clock falling edge is at the 3/4 point of the bit cell.
DLEn =1, if when clock rising edge is at the 3/4 of the bit cell.
Note 1: n denotes an input stream number from 0 to 15.
Table 11 - Frame Input Offset (FOR) Register Bits
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Zarlink Semiconductor Inc.
MT90823
Data Sheet
Measurement Result from
Frame Delay Bits
Input Stream
Offset
Corresponding
Offset Bits
FD11
FD2
FD1
FD0
OFn2
OFn1
OFn0
DLEn
No clock period shift (Default)
1
0
0
0
0
0
0
0
+ 0.5 clock period shift
0
0
0
0
0
0
0
1
+1.0 clock period shift
1
0
0
1
0
0
1
0
+1.5 clock period shift
0
0
0
1
0
0
1
1
+2.0 clock period shift
1
0
1
0
0
1
0
0
+2.5 clock period shift
0
0
1
0
0
1
0
1
+3.0 clock period shift
1
0
1
1
0
1
1
0
+3.5 clock period shift
0
0
1
1
0
1
1
1
+4.0 clock period shift
1
1
0
0
1
0
0
0
+4.5 clock period shift
0
1
0
0
1
0
0
1
Table 12 - Offset Bits (OFn2, OFn1, OFn0, DLEn) and Frame Delay Bits (FD11, FD2-0)
ST-BUS F0i
CLK
STi Stream
offset=0, DLE=0
Bit 7
STi Stream
offset=1, DLE=0
Bit 7
STi Stream
offset=0, DLE=1
Bit 7
STi Stream
offset=1, DLE=1
Bit 7
denotes the 3/4 point of the bit cell
GCI F0i
CLK
Input Stream
offset=0, DLE=0
Bit 0
Input Stream
Input Stream
offset=1, DLE=0
Bit 0
Input Stream
offset=0, DLE=1
Bit 0
offset=1, DLE=1
Bit 0
denotes the 3/4 point of the bit cell
Figure 5 - Examples for Input Offset Delay Timing
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Zarlink Semiconductor Inc.
MT90823
15
LPBK
14
13
12
11
10
9
V/C
MC
CSTo
OE
SAB3
SAB2
8
7
SAB1 SAB0
Data Sheet
6
5
4
CAB6 CAB5 CAB4
3
2
1
0
CAB3 CAB2 CAB1 CAB0
Bit
Name
Description
15
LPBK
Per Channel Loopback. This bit should be use for diagnostic purpose only.
Set this bit to zero for normal operation. When loopback bit is set for all
memory location, the STi n channel m data comes from STo n channel m. For
proper per channel loopback operations, set the delay offset register bits
OFn[2:0] to zero for the streams which are in the loopback mode.
14
V/C
Variable /Constant Throughput Delay. This bit is used to select between
the variable (low) and the constant delay (high) modes on a per-channel
basis.
13
MC
Message Channel. When 1, the contents of the connection memory are
output on the corresponding output channel and stream. Only the lower byte
(bit 7 - bit 0) will be output to the ST-BUS output pins. When 0, the contents of
the connection memory are the data memory address of the switched input
channel and stream.
12
CSTo
11
OE
10 - 8,
7
(Note 1)
SAB3-0
Source Stream Address Bits. The binary value is the number of the data
stream for the source of the connection.
6-0
(Note 1)
CAB6-0
Source Channel Address Bits. The binary value is the number of the
channel for the source of the connection.
Control ST-BUS output. This bit is output on the CSTo pin one channel
early. The CSTo bit for stream 0 is output first.
Output Enable. This bit enables the ST-BUS output drivers on a per-channel
basis.
When 1, the output driver functions normally. When 0, the output driver is in a
high-impedance state.
Note 1: If bit 13 (MC) of the corresponding connection memory location is 1 (device in message mode), then these entire 8 bits
(SAB0, CAB6 - CAB0) are output on the output channel and stream associated with this location.
Table 13 - Connection Memory Bits
Data Rate
CAB Bits Used to Determine the Source Channel of the Connection
2.048 Mb/s
CAB4 to CAB0 (32 channel/input stream)
4.096 Mb/s
CAB5 to CAB0 (64 channel/input stream)
8.192 Mb/s
CAB6 to CAB0 (128 channel/input stream)
Table 14 - CAB Bits Programming for Different Data Rates
22
Zarlink Semiconductor Inc.
MT90823
Data Sheet
JTAG Support
The MT90823 JTAG interface conforms to the IEEE 1149.1 Boundary-Scan standard and the Boundary-Scan Test
(BST) design-for-testability technique it specifies. The operation of the boundary-scan circuitry is controlled by an
external test access port (TAP) Controller.
Test Access Port (TAP)
The Test Access Port (TAP) provides access to the many test functions of the MT90823. It consists of three input
pins and one output pin. The following pins comprise the TAP.
•
Test Clock Input (TCK)
TCK provides the clock for the test logic. The TCK does not interfere with any on-chip clock and thus
remains independent. The TCK permits shifting of test data into or out of the Boundary-Scan register cells
concurrently with the operation of the device and without interfering with the on-chip logic.
•
Test Mode Select Input (TMS)
The logic signals received at the TMS input are interpreted by the TAP Controller to control the test
operations. The TMS signals are sampled at the rising edge of the TCK pulse. This pin is internally pulled to
Vdd when it is not driven from an external source.
•
Test Data Input (TDI)
Serial input data applied to this port is fed either into the instruction register or into a test data register,
depending on the sequence previously applied to the TMS input. Both registers are described in a
subsequent section. The received input data is sampled at the rising edge of TCK pulses. This pin is
internally pulled to Vdd when it is not driven from an external source.
•
Test Data Output (TDO)
Depending on the sequence previously applied to the TMS input, the contents of either the instruction
register or data register are serially shifted out towards the TDO. The data out of the TDO is clocked on the
falling edge of the TCK pulses. When no data is shifted through the boundary scan cells, the TDO driver is
set to a high impedance state.
•
Test Reset (TRST)
Resets the JTAG scan structure. This pin is internally pulled to VDD.
Instruction Register
In accordance with the IEEE 1149.1 standard, the MT90823 uses public instructions. The MT90823 JTAG Interface
contains a three-bit instruction register. Instructions are serially loaded into the instruction register from the TDI
when the TAP Controller is in its shifted-IR state. Subsequently, the instructions are decoded to achieve two basic
functions: to select the test data register that may operate while the instruction is current, and to define the serial
test data register path, which is used to shift data between TDI and TDO during data register scanning.
23
Zarlink Semiconductor Inc.
MT90823
Data Sheet
Test Data Register
As specified in IEEE 1149.1, the MT90823 JTAG Interface contains three test data registers:
•
The Boundary-Scan Register
The Boundary-Scan register consists of a series of Boundary-Scan cells arranged to form a scan path
around the boundary of the MT90823 core logic.
•
The Bypass Register
The Bypass register is a single stage shift register that provides a one-bit path from TDI to its TDO.
•
The Device Identification Register
The device identification register is a 32-bit register with the register contain of:
MSB
LSB
0000 0000 1000 0010 0011 0001 0100 1011
The LSB bit in the device identification register is the first bit clocked out.
The MT90823 boundary scan register contains 118 bits. Bit 0 in Table 15 Boundary Scan Register is the first bit
clocked out. All tristate enable bits are active high.
24
Zarlink Semiconductor Inc.
MT90823
Data Sheet
Boundary Scan Bit 0 to Bit 117
Device Pin
Tristate
Control
Output
Scan
Cell
STo7
STo6
STo5
STo4
STo3
STo2
STo1
STo0
0
2
4
6
8
10
12
14
1
3
5
7
9
11
13
15
ODE
CSTo
Input
Scan
Cell
16
17
18
DTA
19
D15
D14
D13
D12
D11
D10
D9
D8
20
23
26
29
32
35
38
41
21
24
27
30
33
36
39
42
22
25
28
31
34
37
40
43
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
44
47
50
53
56
59
62
65
45
48
51
54
57
60
63
66
46
49
52
55
58
61
64
67
IM
68
AS/ALE
69
CS
70
R/W / WR
71
DS/RD
72
Table 14 - Boundary Scan Register Bits
25
Zarlink Semiconductor Inc.
MT90823
Data Sheet
Boundary Scan Bit 0 to Bit 117
Device Pin
Tristate
Control
Output
Scan
Cell
Input
Scan
Cell
A7
A6
A5
A4
A3
A2
A1
A0
73
74
75
76
77
78
79
80
WFPS
81
RESET
82
CLK
83
FE/HCLK
84
F0i
85
STi15
STi14
STi13
STi12
STi11
STi10
STi9
STi8
STi7
STi6
STi5
STi4
STi3
STi2
STi1
STi0
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
STo15
STo14
STo13
STo12
STo11
STo10
STo9
STo8
103
105
107
109
111
113
115
117
102
104
106
108
110
112
114
116
Table 14 - Boundary Scan Register Bits (continued)
26
Zarlink Semiconductor Inc.
MT90823
Data Sheet
Applications
Switch Matrix Architectures
The MT90823 is an ideal device for medium to large size switch matrices where voice and grouped data channels
are transported within the same frame. In such applications, the voice samples have to be time interchanged with a
minimum delay while maintaining the integrity of grouped data. To ensure the integrity of grouped data during
switching and to provide a minimum delay for voice connections, the MT90823 provides per-channel selection
between variable and constant throughput delay. This can be selected by the V/C bit of the Connection Memory.
Figure 6 illustrates how four MT90823 devices can be used to form non-blocking switches for up to 4096 channels
with data rate of 8.192 Mb/s.
Serial Input Frame Alignment Evaluation
The MT90823 is capable of performing frame alignment evaluation. The frame pulse under evaluation is connected
to the FE (frame measurement) pin. An external multiplexer is required to select one of the frame pulses related to
the different input streams. Figure 7 - The block diagram at Figure 7 shows a switch matrix that performs frame
alignment evaluation for 16 frame pulses.
16 Streams
IN
16 Streams
16 Streams
MT90823
#1
OUT
16 Streams
MT90823
#2
MT90823
#3
Bit Rate
(IN/OUT)
MT90823
#4
2.048 Mb/s
4.096 Mb/s
8.192 Mb/s
Size of
Switch Matrix
1,024 - Channel Switch
2,048 - Channel Switch
4,096 - Channel Switch
Figure 6 - Switch Matrix with Serial Stream at Various Bit Rates
27
Zarlink Semiconductor Inc.
MT90823
STi0
STi1
STi2
Data Sheet
MT90823
Frame Alignment
Evaluation circuit
STi15
External
Mux
FE
input
CLK
STo[0:15]
FP
FP STi0
FP STi1
FP STi2
Central
Timing Source
FP STi15
Note:
1. Use the external mux to select one of the serial frame pulses.
2. To start a measurement cycle, set the Start Frame Evaluation (SFE) bit in the IMS register low for at least 1 frame.
3. Frame evaluation starts when the SFE bit is changed from low to high.
4. Two frames later, the Complete Frame Evaluation (CFE) bit of the Frame Alignment Register (FAR) changes from low
to high to signal the CPU that a valid offset measurement is ready to be read from bit [11:0] of the FAR register.
5. The SFE bit must be set to zero before a new measurement cycle started.
Figure 7 - Serial Input Frame Alignment Evaluation for Various Frame Pulses
Wide Frame Pulse (WFP) Frame Alignment Mode
When the device is in the wide frame pulse mode and if the input data streams are sampled at 3/4 bit time, the
device can operate in the HMVIP and MVIP-90 environment. When input data streams are sampled at half-bit time
as specified in the HMVIP and MVIP-90 standard, the device can only operate with data rate of 2 Mb/s. Refer to the
ST-BUS output delay parameter, tSOD, as specified in the AC Electrical Characteristic table.
The MT90823 is designed to accept a common frame pulse F0i, the 4.096 MHz and 16.384 MHz clocks required by
the HMVIP standards. To enable the Wide Frame Pulse Frame Alignment Mode, the WFPS pin has to be set to
HIGH and the DR1 and DR0 bits set for 8.192M b/s data rate operation.
Digital Access Cross-Connect System
Figure 8 illustrates the use of MT90823 devices to construct a 256 E1/T1 Digital Access Cross- connect System
(DACS). The system consists of 32 trunk cards each having eight E1 or T1 trunk interfaces for a total of 256 trunks.
Each trunk card uses two MT8986 Multi-rate Digital Switches. The central switching block uses 16 MT90823
devices.
The block diagram at Figure 9 shows how an 8,192 x 8,192 channel switch can be constructed from 4,096 x 4,096
channel switch modules. Figure 6 shows the implementation of the individual 4,096 x 4,096 channel switch
modules from four MT90823 devices.
Figure 10 shows an eight-stream trunk card using MT8986 Multi-rate Digital Switches to concentrate 32-channel
2.048 Mb/s ST-BUS (DSTi and DSTo) streams at each E1/T1 trunk onto four 128-channel 8.192 Mb/s streams.
The DACS switching matrix that formerly required 256 MT8986 devices in a square (16 x 16) configuration can now
be provided by 64 MT8986 and 16 MT90823 devices (see Figure 8).
28
Zarlink Semiconductor Inc.
MT90823
TC0
E10
Data Sheet
Each line represents a stream
that consists of
128 channels at 8.192 Mb/s
8 x E1/T1
Trunk Card
E17
8,192 x 8,192 channel
Switch Matrix
TC1
E18
8 x E1/T1
Trunk Card
E115
TC31
E1247
Sixteen MT90823
(8 Mb/s mode)
64 input streams
x
64 output streams
(See Figure 9)
8 x E1/T1
Trunk Card
(Figure 10)
E1255
Figure 8 - 256 E1/T1 Digital Access Cross-Connect System (DACS)
32 Streams
4,096 x 4,096
Switch Matrix
(Figure 6)
4,096 x 4,096
Switch Matrix
(Figure 6)
32 Streams
IN
32 Streams
OUT
4,096 x 4,096
Switch Matrix
(Figure 6)
4,096 x 4,096
Switch Matrix
(Figure 6)
32 Streams
Figure 9 - 8,192 x 8,192 Channel Switch Matrix
29
Zarlink Semiconductor Inc.
MT90823
E10
E11
E1/T1 Trunk 0
DSTo
DSTi
E1/T1 Trunk 1
DSTo
DSTi
STi0
STi1
STi7
STo0
STo1
E17
E1/T1 Trunk 7
DSTo
DSTi
STo7
Data Sheet
MT8986
2 Mb/s
to
8 Mb/s
STo0
256-channel out
STo1
(8.192 Mb/s per channel)
MT8986
8 Mb/s
to
2 Mb/s
STi0
256-channel in
STi1
(8.192 Mb/s per channel)
Figure 10 - Trunk Card Block Diagram
Absolute Maximum Ratings*
Parameter
Sym.
Min.
Max.
Units
1
Supply Voltage
VDD
-0.3
5.0
V
2
Voltage on any 3.3 V Tolerant pin I/O (other than supply pins)
VI
VSS - 0.3
VDD + 0.3
V
3
Voltage on any 5 V Tolerant pin I/O (other than supply pins)
VI
VSS - 0.3
5.5
V
4
Continuous Current at digital outputs
Io
20
mA
5
Package power dissipation (PLCC & PQFP)
PD
1
W
6
Storage temperature
TS
+125
°C
- 65
* Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied
Recommended Operating Conditions - Voltages are with respect to ground (Vss) unless otherwise stated.
Characteristics
Sym.
Min.
Typ.
Max.
Units
1
Operating Temperature
TOP
-40
+85
°C
2
Positive Supply
VDD
3.0
3.6
V
3
Input High Voltage
VIH
0.7VDD
VDD
V
4
Input High Voltage on 5 V Tolerant
Inputs
VIH
5.5
V
5
Input Low Voltage
VIL
0.3VDD
V
VSS
30
Zarlink Semiconductor Inc.
Test Conditions
400 mV noise margin
400 mV noise margin
MT90823
Data Sheet
DC Electrical Characteristics - Voltages are with respect to ground (Vss) unless otherwise stated.
Characteristics
Supply Current
3
4
I
N
P
U
T
S
5
6
7
8
Min.
Typ.
Max.
Units
12
15
mA
20
26
mA
45
70
mA
@ 2 Mb/s
1
2
Sym.
O
U
T
P
U
T
S
IDD
@ 4 Mb/s
@ 8 Mb/s
0.7VDD
VIH
Input Low Voltage
VIL
0.3VDD
V
Input Leakage (input pins)
Input Leakage (with pull-up or pulldown)
IIL
IBL
15
50
µA
µA
Input Pin Capacitance
CI
10
pF
VOH
Output Low Voltage
VOL
High Impedance Leakage
IOZ
Output unloaded
V
Input High Voltage
Output High Voltage
Test Conditions
0.8VDD
0≤<V≤VDD See
Note 1
V
IOH = -10 mA
0.4
V
IOL = 10 mA
5
µA
0 < V < VDD See
Note 1
10
9
Output Pin Capacitance
CO
Note:
1. Maximum leakage on pins (output or I/O pins in high impedance state) is over an applied voltage (V)
pF
AC Electrical Characteristics - Timing Parameter Measurement Voltage Levels
Characteristics
Sym.
Level
Units
1
CMOS Threshold
VCT
0.5VDD
V
2
Rise/Fall Threshold Voltage High
VHM
0.7VDD
V
3
Rise/Fall Threshold Voltage Low
VLM
0.3VDD
V
31
Zarlink Semiconductor Inc.
Conditions
MT90823
Data Sheet
AC Electrical Characteristics - Frame Pulse and CLK
Characteristic
Sym.
Min.
Typ.
Max.
Units
Notes
295
145
80
ns
ns
ns
WFPS Pin = 0
1 Frame pulse width (ST-BUS, GCI)
Bit rate = 2.048 Mb/s
Bit rate = 4.096 Mb/s
Bit rate = 8.192 Mb/s
tFPW
2 Frame Pulse Setup time before
CLK falling (ST-BUS or GCI)
tFPS
5
ns
WFPS Pin = 0
3 Frame Pulse Hold Time from CLK
falling (ST-BUS or GCI)
tFPH
10
ns
WFPS Pin = 0
4 CLK Period
Bit rate = 2.048 Mb/s
Bit rate = 4.096 Mb/s
Bit rate = 8.192 Mb/s
tCP
5 CLK Pulse Width High
Bit rate = 2.048 Mb/s
Bit rate = 4.096 Mb/s
Bit rate = 8.192 Mb/s
tCH
6 CLK Pulse Width Low
Bit rate = 2.048 Mb/s
Bit rate = 4.096 Mb/s
Bit rate = 8.192 Mb/s
tCL
7 Clock Rise/Fall Time
tr, tf
26
26
26
190
110
55
300
150
70
ns
ns
ns
WFPS Pin = 0
85
50
20
150
75
40
ns
ns
ns
WFPS Pin = 0
85
50
20
150
75
40
ns
ns
ns
WFPS Pin = 0
10
ns
8 Wide frame pulse width
Bit rate = 8.192 Mb/s
tHFPW
195
295
ns
WFPS Pin = 1
9 Frame Pulse Setup Time before
HCLK falling
tHFPS
5
150
ns
WFPS Pin = 1
10 Frame Pulse Hold Time from
HCLK falling
tHFPH
10
150
ns
WFPS Pin = 1
11 HCLK (4.096MHz) Period
Bit rate = 8.192 Mb/s
tHCP
190
300
ns
WFPS Pin = 1
12 HCLK (4.096MHz) Pulse Width
High
Bit rate = 8.192 Mb/s
tHCH
85
150
ns
WFPS Pin = 1
13 HCLK (4.096MHz) Pulse Width
Low
Bit rate = 8.192 Mb/s
tHCL
85
150
ns
WFPS Pin = 1
10
ns
10
ns
14 HCLK Rise/Fall Time
15 Delay between falling edge of
HCLK and falling edge of CLK
tHr, tHf
tDIF
-10
32
Zarlink Semiconductor Inc.
WFPS Pin = 0 or 1
MT90823
Data Sheet
AC Electrical Characteristics - Serial Streams for ST-BUS and GCI Backplanes
Characteristic
Sym.
Min.
Typ.
Max.
Units
Test Conditions
1
Sti Set-up Time
tSIS
0
ns
2
Sti Hold Time
tSIH
10
ns
3
Sto Delay - Active to Active
tSOD
30
40
4
STo delay - Active to High-Z
tDZ
32
RL=1K, CL=200pF, See Note 1
5
Sto delay - High-Z to Active
tZD
32
RL=1K, CL=200pF, See Note 1
6
Output Driver Enable (ODE)
Delay
tODE
32
ns
RL=1K, CL=200pF, See Note 1
7
CSTo Output Delay
tXCD
30
40
ns
ns
CL=30pF
CL=200pF
ns
ns
CL=30pF
CL=200pF
Note:
1. High Impedance is measured by pulling to the appropriate rail with RL, with timing corrected to cancel time taken to discharge CL.
tFPW
F0i
VCT
tFPS
tCP
tFPH
tCH
tCL
tr
VHM
VTT
VLM
CLK
tSOD
STo
Bit 0, Last Ch (Note1)
tf
Bit 7, Channel 0
tSIS
STi
Bit 0, Last Ch (Note1)
Bit 6, Channel 0
Bit 5, Channel 0
VCT
tSIH
Bit 7, Channel 0
Bit 6, Channel 0
Bit 5, Channel 0
VCT
Note 1:
2.048 Mb/s mode, last channel = ch 31,
4.196 Mb/s mode, last channel = ch 63,
8.192 Mb/s mode, last channel = ch 127.
Figure 11 - ST-BUS Timing for 2.048 Mb/s and High Speed Serial Interface at 4.096 Mb/s
or 8.192 Mb/s, when WFPS pin = 0.
33
Zarlink Semiconductor Inc.
MT90823
Data Sheet
tFPW
F0i
VCT
tFPS
tCP
tFPH
tCH
tCL
tr
VHM
VCT
VLM
CLK
tSOD
STo
tf
Bit 7, Last Ch (Note1)
Bit 0, Channel 0
tSIS
STi
Bit 1, Channel 0
tSIH
Bit 0, Channel 0
Bit 7, Last Ch (Note1)
VCT
Bit 2, Channel 0
Bit 1, Channel 0
VCT
Bit 2, Channel 0
Note 1:
2 Mb/s mode, last channel = ch 31,
4 Mb/s mode, last channel = ch 63,
8 Mb/s mode, last channel = ch 127
Figure 12 - GCI Timing at 2.048 Mb/s and High Speed Serial Interface
at 4.096 Mb/s or 8.192 Mb/s, when WFPS pin = 0
tHFPW
tHFPS
tHFPH
VCT
F0i
tHCP
tHCH
tHCL
HCLK
4.096MHz
tDIF
VHM
VCT
VLM
tHf
tHr
tCP
tCH
tCL
tr
CLK
16.384MHz
VCT
tSOD
STo
Bit 1, Ch 127
Bit 0, Ch 127
tf
Bit 7, Ch 0
tSIS
STi
Bit 1, Ch 127
Bit 0, Ch 127
Bit 6, Ch 0
Bit 5, Ch 0
Bit 4, Ch 0
VCT
tSIH
Bit 7, Ch 0
Bit 6, Ch 0
Bit 5, Ch 0
Bit 4, Ch 0
VCT
Figure 13 - WFP Bus Timing for High Speed Serial Interface (8.192 Mb/s), when WFPS pin = 1
Note:
1. High Impedance is measured by pulling to the appropriate rail with RL, with timing corrected to cancel time taken to discharge CL.
34
Zarlink Semiconductor Inc.
MT90823
CLK
Data Sheet
VCT
(ST-BUS or)
(WFPS mode)
CLK
(GCI mode)
VCT
tDZ
STo
Valid Data
HiZ
VCT
Valid Data
VCT
tZD
HiZ
STo
tXCD
VCT
CSTo
Figure 14 - Serial Output and External Control
VCT
ODE
tODE
tODE
STo
HiZ
Valid Data
HiZ
VCT
Figure 15 - Output Driver Enable (ODE)
35
Zarlink Semiconductor Inc.
MT90823
Data Sheet
AC Electrical Characteristics - Multiplexed Bus Timing (Mode 1)
Characteristics
Sym.
Min.
Typ.
Max.
Units
1
ALE pulse width
tALW
20
ns
2
Address setup from ALE falling
tADS
3
ns
3
Address hold from ALE falling
tADH
3
ns
4
RD active after ALE falling
tALRD
3
ns
5
Data setup from DTA Low on Read
tDDR
5
ns
6
CS hold after RD/WR
tCSRW
5
ns
7
RD pulse width (fast read)
tRW
45
ns
8
CS setup from RD
tCSR
0
ns
9
Data hold after RD
tDHR
10
10 WR pulse width (fast write)
tWW
45
ns
11 WR delay after ALE falling
tALWR
3
ns
12 CS setup from WR
tCSW
0
ns
13 Data setup from WR (fast write)
tDSW
20
ns
14 Valid Data Delay on write (slow write)
tSWD
15 Data hold after WR inactive
tDHW
16 Acknowledgment Delay:
Reading/Writing Registers
Reading/Writing Memory @ 2Mb/s
@ 4Mb/s
@ 8Mb/s
tAKD
17 Acknowledgment Hold Time
tAKH
20
122
5
ns
Test Conditions
CL=150pF
CL=150pF, RL=1K,
Note 1.
ns
ns
43/43
760/750
400/390
220/210
ns
ns
ns
ns
CL=150pF
CL=150pF
CL=150pF
CL=150pF
22
ns
CL=150pF, RL=1K,
Note 1.
Note:
1. High Impedance is measured by pulling to the appropriate rail with RL, with timing corrected to cancel time taken to discharge CL.
36
Zarlink Semiconductor Inc.
MT90823
Data Sheet
tALW
VCT
ALE
AD0-AD7
D8-D15
tADS
HiZ
tADH
ADDRESS
HiZ
HiZ
DATA
tALRD
tCSRW
CS
VCT
tCSR
tRW
RD
VCT
tWW
WR
VCT
tCSW
tDHR
VCT
tSWD
tALWR
tDSW
tDHW
tDDR
DTA
tAKD
Figure 16 - Multiplexed Bus Timing (Mode 1)
37
Zarlink Semiconductor Inc.
tAKH
VCT
MT90823
Data Sheet
AC Electrical Characteristics - Multiplexed Bus Timing (Mode 2)
Characteristics
Sym.
Min.
Typ.
Max.
Units
1
AS pulse width
tASW
20
ns
2
Address setup from AS falling
tADS
3
ns
3
Address hold from AS falling
tADH
3
ns
4
Data setup from DTA Low on Read
tDDR
5
ns
5
CS hold after DS falling
tCSH
0
ns
6
CS setup from DS rising
tCSS
0
ns
7
Data hold after write
tDHW
5
ns
8
Data setup from DS -Write (fast write)
tDWS
20
ns
9
Valid Data Delay on write (slow write)
tSWD
122
CL=150pF
ns
10 R/W setup from DS rising
tRWS
60
ns
11 R/W hold after DS falling
tRWH
5
ns
12 Data hold after read
tDHR
10
13 DS delay after AS falling
tDSH
10
14 Acknowledgment Delay:
Reading/Writing Registers
Reading/Writing Memory @ 2Mb/s
@ 4Mb/s
@ 8Mb/s
tAKD
15 Acknowledgment Hold Time
tAKH
20
Test Conditions
ns
CL=150pF, RL=1K,
Note 1
ns
43/43
760/750
400/390
220/210
ns
ns
ns
ns
CL=150pF
CL=150pF
CL=150pF
CL=150pF
22
ns
CL=150pF, RL=1K,
Note 1
Note 1. High Impedance is measured by pulling to the appropriate rail with RL, with timing corrected to cancel time taken to discharge CL.
38
Zarlink Semiconductor Inc.
MT90823
Data Sheet
DS
VCT
tRWS
tRWH
R/W
VCT
tDSH
tASW
VCT
AS
tADS
AD0-AD7
D8-D15
WR
HiZ
tADH
VCT
DATA
HiZ
ADDRESS
tDHW
tDWS
tSW
tDHR
AD0-AD7
D8-D15
RD
HiZ
VCT
DATA
HiZ
ADDRESS
tCSH
tCSS
VCT
CS
tAKD
tDDR
DTA
tAKH
VCT
Figure 17 - Multiplexed Bus Timing (Mode2)
39
Zarlink Semiconductor Inc.
MT90823
Data Sheet
AC Electrical Characteristics - Motorola Non-Multiplexed Bus Mode
Characteristics
Sym.
Min.
Typ.
Max.
Units
1
CS setup from DS falling
tCSS
0
ns
2
R/W setup from DS falling
tRWS
10
ns
3
Address setup from DS falling
tADS
2
ns
4
CS hold after DS rising
tCSH
0
ns
5
R/W hold after DS rising
tRWH
2
ns
6
Address hold after DS rising
tADH
2
ns
7
Data setup from DTA Low on Read
tDDR
2
8
Data hold on read
tDHR
10
9
Data setup on write (fast write)
tDSW
0
10 Valid Data Delay on write (slow write)
tSWD
11 Data hold on write
tDHW
12 Acknowledgment Delay:
Reading/Writing Registers
Reading/Writing Memory @ 2Mb/s
@ 4Mb/s
@ 8Mb/s
tAKD
13 Acknowledgment Hold Time
tAKH
20
Test Conditions
ns
CL=150pF
ns
CL=150pF, RL=1K
Note 1
ns
122
5
ns
ns
43/43
760/750
400/390
220/210
ns
ns
ns
ns
CL=150pF
CL=150pF
CL=150pF
CL=150pF
22
ns
CL=150pF, RL=1K,
Note 1
Note:
1. High Impedance is measured by pulling to the appropriate rail with RL, with timing corrected to cancel time taken to discharge CL.
40
Zarlink Semiconductor Inc.
MT90823
Data Sheet
VCT
DS
tCSH
tCSS
VCT
CS
tRWH
tRWS
VCT
R/W
tADS
tADH
VCT
VALID ADDRESS
A0-A7
tDHR
AD0-AD7
D8-D15
READ
VCT
VALID READ DATA
tDSW
tSWD
AD0-AD7
D8-D15
WRITE
tDHW
VCT
VALID WRITE DATA
tDDR
VCT
DTA
tAKD
Figure 18 - Motorola Non-Multiplexed Bus Timing
41
Zarlink Semiconductor Inc.
tAKH
Package Code : GA
c Zarlink Semiconductor 2002 All rights reserved.
ISSUE
1
ACN
213934
DATE
20Jan03
APPRD.
Previous package codes:
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