TI1 LMH1218RTWT Low power ultra hd cable driver Datasheet

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LMH1218
SNLS474B – FEBRUARY 2015 – REVISED FEBRUARY 2016
LMH1218 Low Power Ultra HD Cable Driver with Integrated Reclocker
1 Features
3 Description
•
The LMH1218 is a low-power cable driver with
integrated reclocker to drive serial video data
compatible to SMPTE-SDI, SMPTE 2022-5/6, 10GbE
Ethernet, and DVB-ASI standards. The LMH1218
supports up to 11.88 Gbps to enable Ultra High
Definition Video for 4K/8K applications. With 75-Ω
and 50-Ω transmitter outputs, the LMH1218 enables
multiple media options such as coax, fiber, and FR-4
PCB.
1
•
•
•
•
•
•
•
•
•
•
•
Supports ST-2082 (Proposed), ST-2081
(Proposed), SMPTE 424M, 344M, 292M, 259M,
DVB-ASI, SFF-8431 (SFP+) and 10GbE Ethernet
for SMPTE 2022-5/6
Locks to rates 11.88 Gbps, 5.94 Gbps, 2.97 Gbps,
1.485 Gbps, or Divided by 1.001 sub-rates, DVBASI (270 Mbps) and 10GbE (10.3125 Gbps)
Reference-free Operation with Fast Lock Time
Covering All Supported or Selected Data Rates
75-Ω and 100-Ω Transmitter Outputs
Integrated 2:1 Mux Input, 1:2 Demux/Fanout
Outputs
Automatic Slew Rate Based on Input Rate Detect
On-chip Eye Monitor
Low 300 mW Power Consumption With Automatic
Power Down On Loss Of Input Signal
Programmable via SPI, Or SMBus Interface
Single 2.5-V Supply Operation
Small 4 mm × 4 mm 24-pin QFN Package
-40°C to +85°C Operating Temperature Range
The integrated 2-to-1 MUX on the input of the
LMH1218 enables selection between two video
sources,
while
the
programmable
equalizer
compensates for the PC board loss to extend signal
reach. With a wide range clock-and-data recovery
(CDR) circuit, the on-chip reclocker automatically
detects and locks to serial data from 270 Mbps to
11.88 Gbps without the need for an external
reference clock and loop filter component, thereby
simplifying board design and lowering system cost.
The reclocked serial data can be routed to either the
75-Ω or 50-Ω transmitter output, or both
simultaneously (1-to-2 fanout mode). The output
voltage swing is compatible to SFF-8431 (SFP+), ST2082/1 (Proposed), SMPTE 424M, 344M, 292M, and
259M standards.
2 Applications
•
•
•
•
•
A non-disruptive eye monitor allows for real-time
measurement of serial data to simplify system startup
or field tuning. The LMH1218 can be programmed
using SPI or SMBus Interface.
UHDTV/4K/8K/HDTV/SDTV Video
Digital Video Routers and Switches
Digital Video Processing and Editing
DVB-ASI and Distribution Amplifiers
10GbE for SMPTE 2022-5/6
Device Information(1)
PART NUMBER
LMH1218
PACKAGE
QFN (24)
BODY SIZE (NOM)
4 mm × 4 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified SPI Schematic
VDD
MODE_SEL
0.1 PF
0.01 PF
ENABLE
4.7 PF
OUT
FPGA
4.7 PF
IN0+
LMH1218
OUT0+
: T-Line
100: Differential T-Line
OUT
IN0-
OUT0DAP
VSS
OUT
:
IN1+
Optical Module
100: Differential T-Line
IN1-
OUT
IN+
OUT1+
100: Differential T-Line
FPGA
4.7 PF
VSS
4.7 PF
OUT1-
IN-
SS_N
SCK
MOSI
LOS_INT_N
MISO
LOCK
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
LMH1218
SNLS474B – FEBRUARY 2015 – REVISED FEBRUARY 2016
www.ti.com
Table of Contents
1
2
3
4
5
6
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
6
6.1
6.2
6.3
6.4
6.5
6.6
Absolute Maximum Ratings ...................................... 6
ESD Ratings.............................................................. 6
Recommended Operating Conditions....................... 6
Thermal Information .................................................. 7
Electrical Characteristics........................................... 7
Recommended SMBus Interface AC Timing
Specifications ........................................................... 12
6.7 Serial Parallel Interface (SPI) Bus Interface AC
Timing Specifications ............................................... 12
6.8 Typical Characteristics ............................................ 13
7
Detailed Description ............................................ 14
7.1
7.2
7.3
7.4
7.5
Overview .................................................................
Functional Block Diagram .......................................
Feature Description.................................................
Device Functional Modes........................................
Programming ..........................................................
14
14
15
25
25
7.6 Register Maps ......................................................... 26
8
Application and Implementation ........................ 44
8.1
8.2
8.3
8.4
8.5
Application Information............................................
Typical Application .................................................
Do's and Don'ts .......................................................
Initialization Set Up .................................................
Selective Data Rate Lock........................................
44
44
48
48
48
9 Power Supply Recommendations...................... 48
10 Layout................................................................... 49
10.1 Layout Guidelines ................................................. 49
10.2 Layout Example .................................................... 49
10.3 Solder Profile......................................................... 50
11 Device and Documentation Support ................. 51
11.1
11.2
11.3
11.4
11.5
11.6
Device Support......................................................
Documentation Support ........................................
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
51
51
51
51
51
51
12 Mechanical, Packaging, and Orderable
Information ........................................................... 51
4 Revision History
Changes from Revision A (March 2015) to Revision B
Page
•
Changed ESD Ratings for Human-body model (HBM) From: ±2500 To ±4500 ................................................................... 6
•
Added typical launch amplitude for 20 and 30 inch FR4 trace in the Recommended Operating Conditions ........................ 6
•
Added new Note to the Electrical Characteristics: "ATE Production tested using DC method.."........................................... 9
•
Changed the VVOD_OUT0 row information and values in the Electrical Characteristics ............................................................ 9
•
Added MAX value of 45 ps to TR_F_OUT0 in the Electrical Characteristics............................................................................. 10
•
Changed the TYP value From: 900 To: 950 ps, Added MIN and MAX values to TR_F_OUT0 (270 Mbps) in the
Electrical Characteristics ...................................................................................................................................................... 10
•
Changed the TYP value to 3 ps, Added MAX value of 18 ps to TR_F_OUT0_delta in the Electrical Characteristics.................. 10
•
Changed the TYP value From: 100 To: 72 ps, Added MAX value of 500 ps to TR_F_OUT0_delta (270 Mbps) in the
Electrical Characteristics ...................................................................................................................................................... 10
•
Changed the VOVR_UDR_SHOOT row information and values in the Electrical Characteristics ................................................. 10
•
Added tSU MIN = 4 ns in the Serial Parallel Interface (SPI) Bus Interface AC Timing Specifications (4) (5) .......................... 12
•
Added tH MIN = 4 ns in the Serial Parallel Interface (SPI) Bus Interface AC Timing Specifications (4) (5) ............................ 12
•
Added tSSSu MIN = 14 ns, Changed TYP value From: 14 To: 18 ns in the Serial Parallel Interface (SPI) Bus Interface
AC Timing Specifications (4) (5) .............................................................................................................................................. 12
•
Added tSSh MIN = 4 ns in the Serial Parallel Interface (SPI) Bus Interface AC Timing Specifications (4) (5) ......................... 12
•
Added Selective Data Rate Lock in Application and Implementation section. .................................................................... 48
Changes from Original (February 2015) to Revision A
•
2
Page
Changed document status from Product Preview to Production Data .................................................................................. 1
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SNLS474B – FEBRUARY 2015 – REVISED FEBRUARY 2016
5 Pin Configuration and Functions
ENABLE
RESERVED
OUT_CTRL_MOSI_SDA
EQ_SCL_SCK
IN_OUT_SEL_SPI_SS_N_ADR0
MODE_SEL
6
5
4
3
2
1
24-Pin WQFN
Package RTWA0024A
(Top View)
VDD
7
24
VSS
IN1+
8
23
OUT1+
IN1-
9
22
OUT1-
VSS
10
21
VDD
IN0+
11
20
OUT0+
IN0-
12
19
OUT0-
13
14
15
16
17
18
LOS_INT_N
SMPTE_10GbE
VOD_MISO_ADR1
LOCK
RESERVED
RESERVED
DAP = GND
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LMH1218
SNLS474B – FEBRUARY 2015 – REVISED FEBRUARY 2016
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Pin Descriptions – SPI Mode/ Mode_SEL = 1 kΩ to VDD
PIN
NAME
NO.
I/O
DESCRIPTION
CONTROL/INDICATOR I/O
MODE_SEL
1
Input, 4-Level
Determines Device Configuration: SPI or SMBus
1 kΩ to VDD:
•
SPI mode. See Initialization Set Up
SS_N
2
Input, 2-Level
SPI Slave Select. . This pin has internal pull up
SCK
3
Input, 2.5V
LVCMOS, 2-Level
4
Input, 2-Level
MOSI
RESERVED
5,17, 18
SPI serial clock input
SPI Master Output / Slave Input. LMH1218 SPI data receive
No Connect
ENABLE
6
Input, 4-Level
Powers down device when pulled low
1 kΩ to VDD:
•
Power down until valid signal detected
Float(Default):
•
Reserved
20 kΩ to GND:
•
Reserved
1 kΩ to GND:
•
Power down including signal detects and Reset Registers upon
power-up
LOS_INT_N
13
Output,
LVCMOS Open
Drain, 2-Level
Programmable Interrupt caused by change in LOS, violation of internal
eye monitor threshold, or change in lock. External 4.7 kΩ pull-up resistor is
required. This pin is 3.3 V LVCMOS tolerant.
SMPTE_10GbE
14
No Connect
Output, 2.5 V
LVCMOS, 2-Level
SPI Master Input / Slave Output. LMH1218 SPI data transmit
16
Output, 2.5V
LVCMOS, 2-Level
Indicates CDR lock detect status
High:
•
CDR locked
Low:
•
CDR not locked
IN0+
11
Input, Analog
IN0-
12
Input, Analog
IN1+
8
Input, Analog
IN1-
9
Input, Analog
OUT0+
20
Output, 75 Ω CML
Compatible
OUT0-
19
Output, 75 Ω CML
Compatible
OUT1+
23
Output, Analog
OUT1-
22
Output, Analog
VDD
7, 21
2.5 V Supply
VSS
10, 24
Ground
MISO
15
LOCK
HIGH SPEED DIFFERENTIAL I/O
Inverting and non-inverting differential inputs. An on-chip 100 Ω
terminating resistor connects IN0+ to IN0-. Inputs require 4.7 µF AC
coupling capacitors.
Inverting and non-inverting differential inputs. An on-chip 100 Ω
terminating resistor connects IN1+ to IN1-. Inputs require 4.7 µF AC
coupling capacitors.
Inverting and non-inverting 75 Ω outputs. An on-chip 75 Ω terminating
resistor connects OUT0+ and OUT0- to VDD. Outputs require 4.7 µF AC
coupling capacitors
Inverting and non-inverting differential outputs. An on-chip 100 Ω
terminating resistor connects OUT1+ to OUT1-. Outputs require 4.7 µF AC
coupling capacitors
POWER
DAP
4
Ground
2.5 V ± 5%
Exposed DAP, connect to GND using at least 5 vias (see package
drawing)
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SNLS474B – FEBRUARY 2015 – REVISED FEBRUARY 2016
Pin Descriptions – SMBUS Mode/ MODE_SEL = 1 kΩ to GND
PIN
NAME
MODE_SEL
1
ADDR0
2
ADDR1
15
SCL
3
SDA
4
RESERVED
I/O
NO.
Input, 4-Level
Determines Device Configuration: SPI or SMBus
1 kΩ to GND: SMBUS mode. See Initialization Set Up
Input, 4-Level
4-level strap pins used to set the SMBus address of the device. The pin
state is read on power-up. The multi-level nature of these pins allows for
16 unique device addresses. Note SMBus section for further details. The
four strap options include:
1 kΩ to VDD:
•
Represents logic state 11’b
Float(Default): Represents logic state 10'b 7-bits SMBus address = 0x17
20 kΩ to GND:
•
Represents logic state 01'b
1 kΩ to GND:
•
Represents logic state 00'b
Input, 2-Level
SMBus clock input / open drain. External 2 kΩ to 5 kΩ pull-up resistor is
required as per SMBus interface standard. This pin is 3.3 V LVCMOS
tolerant.
SMBus data input / open drain. External 2 kΩ to 5 kΩ pull-up resistor is
I/O, Open Drain, 2required as per SMBus interface standard. This pin is 3.3 V LVCMOS
Level
tolerant.
5,17,18
ENABLE
6
SMPTE_10GbE
14
DESCRIPTION
No Connect
Input, 4-Level
Powers down device when pulled low
1 kΩ to VDD:
•
Power down until valid signal detected
Float(Default): Reserved
20 kΩ to GND:
•
Reserved
1 kΩ to GND:
•
Power down including signal detects and Reset Registers upon
power-up
No Connect
Output, LVCMOS
Open Drain, 2Level
Programmable Interrupt caused by change in LOS, violation of internal
eye monitor threshold, change in lock. External 4.7 kΩ pull-up resistor is
required. This pin is 3.3 V LVCMOS tolerant.
16
Output, 2.5 V
LVCMOS, 2-Level
Indicates CDR lock Status
High:
•
CDR locked
Low:
•
CDR not locked
IN0+
11
Input, Analog
IN0-
12
Input, Analog
IN1+
8
Input, Analog
IN1-
9
Input, Analog
OUT0+
20
Output, 75 Ω CML
Compatible
OUT0-
19
Output, 75 Ω CML
Compatible
OUT1+
23
Output, Analog
OUT1-
22
Output, Analog
VDD
7, 21
2.5 V Supply
VSS
10, 24
Ground
LOS_INT_N
13
LOCK
HIGH SPEED DIFFERENTIAL I/O
DAP
Ground
Inverting and non-inverting differential inputs. An on-chip 100-Ω
terminating resistor connects IN0+ to IN0-. Inputs require 4.7 µF AC
coupling capacitors.
Inverting and non-inverting differential inputs. An on-chip 100-Ω
terminating resistor connects IN0+ to IN0-. Inputs require 4.7 µF AC
coupling capacitors.
Inverting and non-inverting 75 Ω outputs. An on-chip 75-Ω terminating
resistor connects OUT0+ and OUT0- to VDD. Outputs require 4.7 µF AC
coupling capacitors
Inverting and non-inverting differential outputs. An on-chip 100 Ω
terminating resistor connects OUT1+ to OUT1-. Outputs require 4.7 µF AC
coupling capacitors
2.5V ± 5%
Exposed DAP, connect to GND using at least 5 vias (see package
drawing)
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SNLS474B – FEBRUARY 2015 – REVISED FEBRUARY 2016
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6 Specifications
6.1 Absolute Maximum Ratings
Over operating free-air temperature range (unless otherwise noted) (1)
MIN
MAX
UNIT
Supply Voltage (VDD to GND)
-0.5
2.75
V
3.3 V Open drain I/O input/output voltage (SDA, SCL, LOS_INT_N)
-0.5
4.0
V
2.5V LVCMOS Input/Output Voltage
-0.5
VDD + 0.5
V
High Speed input Voltage
-0.5
VDD + 0.5
V
High Speed Input Current
-30
30
mA
(1)
“Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of
device reliability and performance. Functional operation of the device and/or non-degradation at the Absolute Maximum Ratings or other
conditions beyond those indicated in the Recommended Operating Conditions is not implied. The Recommended Operating Conditions
indicate conditions at which the device is functional and the device should not be operated beyond such conditions. Absolute Maximum
Numbers are ensured for a junction temperature range of -40°C to +125°C. Models are validated to Maximum Operating Voltages only.
6.2 ESD Ratings
VALUE
V(ESD)
(1)
(2)
Electrostatic discharge
Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1)
±4500
Charged-device model (CDM), per JEDEC specification JESD22C101 (2)
±1500
UNIT
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. Manufacturing with
less than 500-V HBM is possible with the necessary precautions. Pins listed as ±2000 V may actually have higher performance.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process. Manufacturing with
less than 250-V CDM is possible with the necessary precautions. Pins listed as ±1000 V may actually have higher performance.
6.3 Recommended Operating Conditions
Over operating free-air temperature range (unless otherwise noted)
Supply voltage
(1)
3.3 V Open drain I/O input/output voltage
MIN
TYP
MAX
UNIT
2.375
2.5
2.625
V
3
3.3
3.6
Supply noise, 50 Hz to 10 MHz, sinusoidal (1)
40
V
mVP-P
Ambient Temperature
-40
25
85
Source transmit differential launch amplitude (up to 20 inch FR4
trace)
300
500
1000
mVP-P
Source transmit differential launch amplitude (up to 35 inch FR4
trace)
600
700
800
mVP-P
100
400
kHz
SMBus clock frequency (SCL) in SMBus slave mode
SMBUS SDA and SCL Voltage Level
SPI Clock Frequency
(1)
6
10
ºC
3.6
V
20
MHz
DC plus AC power should not exceed these limits.
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6.4 Thermal Information
RTWA0024A
THERMAL METRIC (1) (2)
24 PINS
RθJA
Junction-to-ambient thermal resistance
RθJC(top)
Junction-to-case (top) thermal resistance
31.4
RθJB
Junction-to-board thermal resistance
11.8
ψJT
Junction-to-top characterization parameter
0.3
ψJB
Junction-to-board characterization parameter
11.8
RθJC(bot)
Junction-to-case (bottom) thermal resistance
2.7
(1)
(2)
UNIT
34
°C/W
For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
No heat sink is assumed for these estimations. Depending on the application, a heat sink, faster air flow, and/or reduced ambient
temperature ( < 85ºC) may be required in order to maintain the maximum junction temperature specified in Electrical Characteristics.
6.5 Electrical Characteristics
Over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
POWER
PD
Power dissipation
Power dissipation in force
RAW mode (CDR bypass)
PD_RAW
Locked 75 Ω OUT0 only
(800 mVpp), EOM
powered down
300
mW
Locked OUT1 only (600
mVpp, diff), EOM powered
down
195
mW
Transient power during
CDR lock acquisition, 75 Ω
OUT0 and OUT1 powered
up, EOM powered down
400
EQ bypass, OUT0
720mVpp, OUT1 600mVpp
IN0 to OUT0 and OUT1 or
IN1 to OUT0 and OUT1
195
mW
IN0 to OUT0, OUT1
powered down
160
mW
IN1 to OUT1, OUT0
powered down
80
mW
500
mW
4-LEVEL INPUT and 2.5 V LVCMOS DC SPECIFICATIONS
VIH
High level input voltage
4-level input (MODE_SEL,
ADDR0/1, ENABLE pins)
0.95*VDD
V
VIF
Float level input voltage
4-level input (MODE_SEL,
ADDR0/1, ENABLE pins)
0.67*VDD
V
VI20K
20K to GND input voltage
4-level input (MODE_SEL,
ADDR0/1, ENABLE pins)
0.33*VDD
V
VIL
Low level input voltage
4-level input (MODE_SEL,
ADDR0/1, ENABLE pins)
0.1
V
VOH
High level output voltage
IOH = -3 mA
VOL
Low level output voltage
IOL = 3 mA
0.4
V
Vinput = VDD
SPI Mode: LVCMOS
(SPI_SCK, SPI_SS_N)
pins
15
µA
SMBus Mode: LVCMOS
(SMB_SDA, SMB_SCL)
pins
15
µA
IIH
Input high leakage current
2
V
SMBus Mode: 4-Levels
(ADDR0, ADDR1) pins
20
44
80
µA
4-Levels (MODE_SEL,
ENABLE) pins
20
44
80
µA
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Electrical Characteristics (continued)
Over operating free-air temperature range (unless otherwise noted)
PARAMETER
IIL
8
Input low leakage current
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Vinput = GND
SPI Mode: LVCMOS
(SPI_MOSI, SPI_SCK)
pins
-15
µA
Vinput = GND
SPI Mode: LVCMOS
(SPI_SS_N) pins
-37
µA
SMBus Mode: LVCMOS
(SMB_SDA, SMB_SCL
pins
-15
µA
SMBus Mode: 4-Levels
(ADDR0, ADDR1) pins
-160
-93
-40
µA
4-Levels (MODE_SEL,
ENABLE) pins
-160
-93
-40
µA
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Electrical Characteristics (continued)
Over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
3.3-V TOLERANT LVCMOS / LVTTL DC SPECIFICATIONS (SDA, SCL, LOS_INT_N)
VIH25
High level input voltage
VIL
Low level input voltage
2.5 V Supply Voltage
1.75
3.6
V
GND
0.8
V
VOL
Low level output voltage
IOL = 1.25 mA
0.4
V
IIH
Input high current
VIN = 2.5 V, VDD = 2.5 V
20
40
μA
IIL
Input low current
VIN = GND, VDD = 2.5 V
-10
10
μA
SIGNAL DETECT
Signal detect (default)
Assert threshold level (1) (2)
SDH
Signal detect (default)
De-assert threshold
level (1)
SDL
11.88 Gbps, SMPTE (EQ,
PLL) Pathological Pattern
26
mVP-P
10.3125 Gbps, 1010 Clock
Pattern, no media
30
mVP-P
10.3125 Gbps, PRBS31
Pattern
21
mVP-P
11.88 Gbps, SMPTE (EQ,
PLL) Pathological Patterns
20
mVP-P
10.3125 Gbps, 1010 Clock
Pattern
15
mVP-P
10.3125 Gbps, PRBS31
Pattern
12
mVP-P
HIGH SPEED RECEIVE RX INPUTS (IN_n+, IN_n-)
R_RD
RLRX-SDD
RLRX-SCD
DC Input differential
resistance
75
Input differential return
loss (3)
Differential to common
mode Input conversion (3)
100
125
Ω
Measured with the device
powered up.
SDD11 10 MHz to 2 GHz
-14
dB
SDD11 2 GHz to 6 GHz
-6.5
dB
SDD11 6 GHz to 12 GHz
-6.5
dB
-20
dB
Measure with the device
powered up.SCD11, 10
MHz to 12 GHz
HIGH SPEED OUTPUTS (OUT_n+, OUT_n-)
VVOD_OUT1
Output differential
voltage (3) (4)
Default setting, 8T clock
pattern
VVOD_OUT1_DE
De-emphasis Level
VOD = 600mV, maximum
De-Emphasis with 16T
clock pattern
-9
VVOD_OUT1_CLK
Clock output differential
voltage
2.97 GHz,1.485 GHz, 297
MHz, and 270 MHz
560
VVOD_OUT0
Output single ended
voltage at OUT0+ with
OUT0- terminated (3) (4)
Default setting
RDIFF_OUT1
DC output differential
resistance
RDIFF_OUT0
DC output single ended
resistance
TR_F_OUT1
Output rise/fall time
(1)
(2)
(3)
(4)
(5)
(5)
Full Slew Rate, 20% to
80% using 8T Pattern
400
720
600
778
700
mVP-P
dB
mVP-P
880
mVP-P
100
Ω
75
Ω
45
ps
Data with extraordinarily long periods of high-frequency 1010 data, and for long, lossy channels, the signal amplitude at the input to the
device may be severely attenuated by the channel and may fall below the signal detect assert and/or de-assert thresholds.
The voltage noise on the receiver inputs which has an amplitude larger than the signal detect assert threshold may trigger a signal
detect assert condition
These limits are ensured by bench characterization and are not production tested.
Dependent on board layout. Characterization data was measured with LMH1218EVM evaluation board
ATE Production tested using DC method. Apply differential DC signal at the input and measure OUT0P amplitude. OUT0N terminated in
75 Ω.
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Electrical Characteristics (continued)
Over operating free-air temperature range (unless otherwise noted)
PARAMETER
TR_F_OUT0
Output rise/fall time,
PRBS10 (3) (4)
TEST CONDITIONS
MIN
TYP
MAX
11.88 Gbps
35
45
ps
5.94 Gbps
35
45
ps
2.97 Gbps
35
45
ps
1.485 Gbps
35
45
ps
950
1500
ps
11.88 Gbps
3
18
ps
5.94 Gbps
3
18
ps
2.97 Gbps
3
18
ps
1.485 Gbps
3
18
ps
72
500
ps
2.4%
3.4%
270 Mbps
TR_F_OUT0_delta
Output rise/fall time
mismatch (3) (4)
270 Mbps
VOVR_UDR_SHOOT
VDC_OFFSET
VDC_WANDER
RLOUT0_S22
RLOUT1_SDD22
RLOUT1_SCC22
Output overshoot,
undershoot (3) (4)
DC offset
(3)
DC wander (3)
OUT0 single ended 75-Ω
return loss (3) (4) (6)
OUT1 differential 100-Ω
return loss (3) (4) (7)
OUT1 common mode 50Ω return loss (3) (4) (7)
UNIT
12G/6G/3G/HD/SD
Measured with 8T pattern
12G/6G/3G/HD/SD
12G/6G/3G/HD/SD EQ
Pathological
400
±0.2
V
20
mV
S22 5 MHz to 1.485 GHz
< -15
dB
S22 1.485 GHz to 3 GHz
< -10
dB
S22 3 GHz to 6 GHz
< -7
dB
S22 6 GHz to 12 GHz
< -4
dB
SDD22 10 MHz - 2 GHz
-20
dB
SDD22 2 GHz - 6 GHz
-17
dB
SDD22 6 GHz - 11.1 GHz
-14
dB
SCC22 10 MHz - 4.75
GHz
-11
dB
SCC22 4.75 GHz - 11.1
GHz
-12
dB
VVCM_OUT1_NOISE
AC common mode voltage
noise (3) (4)
VOD = 0.6 Vpp, DE = 0dB,
PRBS31, 10.3125 Gbps
TRCK_LATENCY
Latency reclocked
Reclocked Data
1.5 UI +195
ps
TRAW_LATENCY
Latency CDR bypass
Raw Data
230
ps
8
mVRMS
TRANSMIT OUTPUT JITTER SPECIFICATIONS
AJ_OUT0
Alignment jitter (3) (4)
OUT0, PRBS15, 11.88
Gbps
0.18
UI
TJ_OUT1
Total jitter (1E-12) (3) (4)
OUT1, PRBS15 10.3125
Gbps
0.12
UI
RJ_OUT1
Random jitter (rms)
OUT1, PRBS15, 10.3125
Gbps
0.38
psRMS
DJ_OUT1
Deterministic jitter
OUT1, PRBS15, 10.3125
Gbps
7
psP-P
Deterministic jitter
OUT1, RAW MODE (CDR
bypass)
PRBS15, 11.88 Gbps, 35
inch FR4 trace, EQ=0x95,
VID = 800mVpp
25
psP-P
DJ_OUT1_RAW
CLOCK DATA RECOVERY
(6)
(7)
10
Output return loss is dependent on board design, this is measured with the LMH1218EVM evaluation board
Measure with the device powered up and outputs a clock signal.
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Electrical Characteristics (continued)
Over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
TYP
MAX
UNIT
ST-2082 (proposed) (8)
11.88,
11.868
Gbps
(8)
ST-2081 (proposed)
DDATA_RATE
MIN
5.94, 5.934
Gbps
SMPTE 424 (8)
2.97, 2.967
Gbps
SMPTE 292 (8)
1.485,
1.4835
Gbps
270
Mbps
SMPTE 259M (8)
10 GbE
(8)
10.3125
Gbps
Measured with 0.2UI SJ at
10.3125 Gbps
8
MHz
Measured with 0.2UI SJ at
11.88 Gbps
13
MHz
Measured with 0.2UI SJ at
5.94 Gbps
7
MHz
Measured with 0.2UI SJ at
2.97 Gbps
5
MHz
Measured with 0.2UI SJ at
1.485 Gbps
3
MHz
Measured with 0.2UI SJ at
270 Mbps
1
MHz
Total input jitter tolerance
TJ = DJ + RJ + SJ,
DJ+RJ = 0.15 UI
SJ/PJ, low to high upward
sweep (10 kHz to 80 MHz)
0.65
UI
TLOCK
Lock time (3) (9)
From signal detected to
the lock asserted,
HEO/VEO lock monitor
disable, same setting for
11.88G, 5.94G, 2.97G,
1.485G and 270 MHz data
rates
<5
ms
TTEMP_LOCK
Temperature Lock Range,
CDR lock with temperature 5ºC per minute ramp up
ramp
and down, -40ºC to 85ºC
operating range
125
°C
PPLL_BW
JTOL
(8)
(9)
PLL bandwidth at -3 dB
Data rate tolerance is within ±1000 ppm
The total CDR lock time depends on number of rate settings enabled and application data rate
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6.6 Recommended SMBus Interface AC Timing Specifications (1) (2) (3)
Over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
TYP
MAX
UNIT
10
100
400
kHz
fSMB
Bus operating frequency
tBUF
Bus free time between stop and start
condition
1.3
μs
tHD:STA
Hold time after (repeated) start condition
After this period, the first clock is
generated
0.6
μs
tSU:STA
Repeated start condition setup time
0.6
μs
tSU:STO
Stop condition setup time
0.6
μs
tHD:DAT
Data hold time
0
ns
tSU:DAT
Data setup time
100
ns
tLOW
Clock low period
1.3
μs
tHIGH
Clock high period
0.6
50
μs
tF
SDA fall time read operation
300
ns
tR
SDA rise time read operation
300
ns
(1)
(2)
(3)
MODE_SEL = 0
MIN
SMBus operation is available 20ms after power up
These specifications support SMBus 2.0 specifications
These Parameters are not production tested
6.7 Serial Parallel Interface (SPI) Bus Interface AC Timing Specifications (1) (2)
Over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST
CONDITIONS
MIN
MAX
UNIT
10
20
MHz
f SCK
SCK frequency
TSCK
SCK period
tPH
SCK pulse width high
0.40*TSCK
ns
tPL
SCK pulse width low
0.40*TSCK
ns
tSU
MOSI setup time
4
ns
tH
MOSI hold time
4
4
ns
tSSSu
SS_N setup time
14
18
ns
tSSH
SS_N hold time
4
4
ns
tSSOF
SS_N off time
1
μs
tODZ
MISO driven to TRI-STATE time
20
ns
tOZD
MISO TRI-STATE-to-Driven
time
10
ns
tOD
MISO output delay time
15
ns
(1)
(2)
12
MODE_SEL = 1
TYP
50
4
ns
Typical values are parametric norms at VDD = 2.5 V, TA = 25ºC, and recommended operating conditions at the time of product
characterization. Typical values are not production tested.
These specifications support SPI 1.0 specifications.
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6.8 Typical Characteristics
Typical device characteristics at TA = +25°C and VDD = 2.5 V, unless otherwise noted.
Figure 1. 11.88 Gbps 50 Ω OUT1
Figure 2. 10.3125 Gbps 50 Ω OUT1
Figure 3. 11.88 Gbps 75 Ω OUT0
Figure 4. 5.94 Gbps 75 Ω OUT0
Figure 5. 2.97 Gbps 75 Ω OUT0
Figure 6. 1.485 Gbps 75 Ω OUT0
Figure 7. Internal Input Eye Monitor Plot
Figure 8. 11.88 Gbps Internal Eye Monitor Hit Density Plot
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7 Detailed Description
7.1 Overview
The LMH1218 is a 11.88Gbps/5.94Gbps/2.97Gbps/1.485Gbps/0.27Gbps/10GbE multi-rate serial digital video
data cable driver with integrated reclocker intended for equalizing, reclocking, and driving data compatible to the
SMPTE standards, proposed ST-2081/2, and 10GbE specifications. It is a 2-input, 2-output single-core chip,
enabling 1:2 fan-out or 2:1 MUX operation. Each input has a 100-Ω continuous time linear equalizer (CTLE) at
the front-end, intended to compensate for loss over STP coax, fiber, or FR-4 backplane. OUT1 is a 100-Ω driver
compatible to 10GbE SFF-8431 optical module requirements. The LMH1218 OUT0 is a 75-Ω cable driver
compatible to the SMPTE and proposed ST-2081/2 requirements.
The referenceless Clock-and-Data Recovery (CDR) circuit selects between the two inputs based on user choice.
The reclocked output can be driven to one or two outputs. One of the outputs supports 100-Ω differential cable
connection, while the other output can drive a 75-Ω SMPTE specified cable while meeting transmitter
requirements as specified in SMPTE standard. The LMH1218 locks to all required SDI data rates, including
270Mbps, 1.485 Gbps, 1.4835 Gbps, 2.97 Gbps, 2.967 Gbps, 5.94 Gbps, 5.934 Gbps, 11.88 Gbps, and 11.868
Gbps as well as 10.3125 Gbps. The LMH1218 is assembled in a 4 mm × 4 mm 24-pin QFN package. The chip
can be programmed using SPI or SMBus interface.
7.2 Functional Block Diagram
Mux Control
Mute
LA
OUT0(75
)
Loss Of
Signal
75
BNC
FR4 EQ
100
FPGA/Cross Point
Raw
OUT1(100
)
Retimed
FR4 EQ
100
FPGA/Cross Point
Clock
CDR
100
Data or Clock
Mute
Polarity Control
Eye
Monitor
VCO
14
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DAP
VSS
VDD
LOS_INT_N
Status
SMPTE_10GbE
IN_OUT_SEL_SPI_SS_N_ADDR0
EQ_SCL_SCK
VOD_MISO_ADDR1
OUT_CTRL_MOSI_SDA
MODE_SEL
ENABLE
Control Logic Block
LOCK
Loss Of
Signal
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7.3 Feature Description
The LMH1218 data path consists of several key blocks as shown in the Functional Block Diagram. These key
circuits are:
• Loss of Signal Detector
• Continuous Time Linear Equalizer (CTLE) for FR4 Compensation
• 2:1 Multiplexer/1:2 Fanout
• CDR
• Eye Monitor
• Differential Output Selection
• 75-Ω and 100-Ω Output Drivers
• SMBus/SPI Configuration
7.3.1 Loss of Signal Detector
The LMH1218 supports two high speed differential input ports, with internal 100-Ω terminations. The inputs must
be AC coupled. The external AC coupling capacitor value should take into account the pathological low
frequency content. For most applications, the RC time constant of 4.7 µF AC coupling capacitor plus the 50-Ω
termination resistor is capable of handing the pathological video pattern's low frequency content.
The signal detect circuit is designed to assert when data traffic with a certain minimum amplitude is present at
the input of the device. It is also designed to de-assert, or remain de-asserted, when there is noise below certain
amplitude at the input to the device.
The LMH1218 has two signal detect circuits, one for each input. Each signal detect threshold can be set
independently. By default, both signal detects are powered on. The user selects IN1 or IN0 through SMBus/SPI
interface.
7.3.2 Continuous Time Linear Equalizer (CTLE)
The LMH1218 has receive-side equalization, and a key part is the Continuous Time Linear Equalizer (CTLE).
This circuit operates on the received differential signal and compensates for frequency-dependent loss due to the
transmission media. The CTLE applies gain to the input signal. This gain varies over frequency: higher
frequencies are boosted more than lower frequencies. The CTLE works to restore the input signal to full
amplitude across a wide range of frequencies.
The CTLE consists of 4 stages with each stage having two boost control bits. This allows 256 different boost
settings. CTLE boost levels are determined by summing the boost levels of the 4 stages. The CTLE is configured
manually. Refer to LMH1218 Programming Guide (SNLU174) on how to quickly select the most appropriate
CTLE boost setting.
There are two CTLEs, one for each input, IN0 and IN1. Only one CTLE is enabled at a time, according to the
user input channel selection. If IN0 is selected, the CTLE for IN0 is powered on and the IN1 CTLE is powered
off. The CTLE compensates for up to 27 dB of loss at 6 GHz. The CTLE is able to handle low loss channels
without over-equalizing by bypassing the CTLE.
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Feature Description (continued)
7.3.3 2:1 Multiplexer
A 2:1 input multiplexor connects IN0 and IN1 to the CDR. By default, IN0 is selected. To select IN1, the 2:1
multiplexer must be set. Refer to LMH1218 Programming Guide (SNLU174) for detailed settings.
7.3.4 Clock and Data Recovery
By default, the equalized data is fed into the CDR for clock and data recovery. The CDR consists of a referenceless Phase Frequency Detector (PFD), Charge Pump (CP), Voltage Controlled Oscillator (VCO), and Output
Data Multiplexer (Mux).
The inputs to the Phase and Frequency Detector (PFD) are the data after the CTLE as well as I and Q clocks
from the VCO. The LMH1218 will attempt to lock to the incoming data by tuning the VCO to phase-lock to the
incoming data rate.
The supported data rates are listed in the following table. Refer to LMH1218 Programming Guide (SNLU174) for
further information on configuring the LMH1218 for different data rates.
Table 1. Supported Data Rates
DATA RATE RANGE
CDR MODE
11.88 Gbps, 11.868 Gbps
Enabled
5.94Gbps, 5.934 Gbps
Enabled
2.97 Gbps, 2.967 Gbps
Enabled
1.485 Gbps, 1.4835 Gbps
Enabled
270 Mbps
Enabled
COMMENT
10.3125 Gbps
Enabled
125 Mbps
Disabled
At 125 Mbps device is in CDR bypass
1.25 Gbps
Disabled
At 1.25 Gbps device is in CDR bypass
7.3.5 Eye Opening Monitor (EOM)
The LMH1218 has an on-chip eye opening monitor (EOM) which can be used to analyze, monitor, and diagnose
the performance of the link. The EOM operates on the post-equalized waveform, just prior to the data sampler.
Therefore, it captures the effects of all the equalization circuits within the receiver before the data is reclocked.
The EOM is operational for 1.485 Gbps and higher data rates.
The EOM monitors the post-equalized waveform in a time window that spans one unit intervals and a
configurable voltage range that spans up to ±400 mV differential. The time window and voltage range are divided
into 64 steps, so the result of the eye capture is a 64 × 64 matrix of “hits,” where each point represents a specific
voltage and phase offset relative to the main data sampler. The number of “hits” registered at each point needs
to be taken in context with the total number of bits observed at that voltage and phase offset in order to
determine the corresponding probability for that point. The number of bits observed at each point is configurable.
A common measurement performed by the EOM is the horizontal and vertical eye opening. The horizontal eye
opening (HEO) represents the width of the post-equalized eye at 0-V differential amplitude, measured in unit
intervals or picoseconds. The vertical eye opening (VEO) represents the height of the post-equalized eye,
measured midway between the mean zero crossing of the eye. This position in time approximates the CDR
sampling phase.
The resulting 64 × 64 matrix produced by the EOM can be processed by software and visualized in a number of
ways. Two common ways to visualize this data are shown in Figure 7 and Figure 8. These diagrams depict
examples of eye monitor plot implemented by software. The first plot is an example of using the EOM data to plot
a basic eye using ASCII character, which can be useful for simple diagnostics software. The second plot shows
the first derivative of the EOM data, revealing the density of hits and the actual waveforms and crossing that
comprise the eye.
16
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7.3.6 Fast EOM
Fast EOM is a mechanism that provides an option to read out EOM through SPI/SMBus interfaces by reading
the hits observed for each point of 64 × 64 points matrix. Since SPI interface operates at faster clock rate than
SMBus interface, the SPI master will have to wait until the EOM start bit, reg 0x24[0], goes low. This indicates
EOM samples are available and the SPI master can proceed to read register 0x25 and 0x26. Refer to LMH1218
Programming Guide (SNLU174) for further details of Fast EOM operation.
7.3.6.1 SMBus Fast EOM Operation
In SMBus mode, the read on register 0x26 acts as an automatic trigger to read the next EOM count value:
1. Enable EOM (power it on), and set VRANGE=0. Write Reg 0x24[7] to 1 to turn on fast EOM
2. Do burst read register 0x25 and 0x26 (EOM hit count) and discard
3. Do burst read register 0x25 and 0x26 (EOM hit count) and discard
4. Do burst read register 0x25 and 0x26 (EOM hit count) and save
5. Perform Step 4 4095 times (64 × 64 cells)
7.3.6.2 SPI Fast EOM Operation
To
1.
2.
3.
4.
perform EOM calculation over SPI:
Enable EOM (power it on), and set VRANGE=0. Write Reg 0x24[7] to 1 to turn on fast EOM
Read Reg 0x26 to initialize. Discard read data
Read Reg 0x24[0] which is EOM start bit. Wait for this bit to go low
Read register 0x26 EOM hit count and discard. Read on register 0x26 will automatically trigger the next Fast
Eye calculation
5. Read Reg 0x24[0]. Wait for this bit to go low
6. Do burst read on register 0x25 and 0x26 to get the EOM count value.
7. Repeat Steps 5 and 6 4095 times (64 × 64 cells)
7.3.7 LMH1218 Device Configuration
The control pins can be used to configure different operations depending on the functional modes as described
in Table 2.
Table 2. Control Pins
FUNCTIONAL MODES
PIN #
PIN NAME
SPI
SMBus_Slave
1
MODE_SEL
1 kΩ to VDD
1 kΩ to GND
2
IN_OUT_SEL_SPI_SS_N_ADDR0
SPI_SS_N
ADDR0
3
EQ_SCL_SCK
SPI_SCK
SMBUS_SCL
4
OUT_CTRL_MOSI_SDA
SPI_MOSI
SMBUS SDA
6
ENABLE
ENABLE
ENABLE
13
LOS_INT_N
LOS_INT_N
LOS_INT_N
15
VOD_MISO_ADDR1
SPI_MISO
ADDR1
16
LOCK
LOCK
LOCK
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7.3.7.1 MODE_SEL
This pin can be configured in 4 possible ways:
1. 1 kΩ to VDD: This puts the part in SPI mode
2. Float (Default): Reserved
3. 20 kΩ to GND: Reserved
4. 1 kΩ to GND: This puts the part in SMBus mode
7.3.7.2 ENABLE
Normal operation when ENABLE is pulled high, and powers down the device when pulled low.
Table 3. ENABLE Selection
ENABLE
POWER CONDITION
1 kΩ to GND
Power down device (signal detectors powered down, registers at reset state)
20 kΩ to GND
Reserved
Float
Reserved
1 kΩ to VDD
Normal Operation
7.3.7.3 LOS_INT_N
LOS_INT_N pin is an open drain output. When the channel that has been selected cannot detect a signal at the
high-speed input pins (as defined by the assert levels), the pin pulls low. Pin 13 can be configured through share
register 0xFF[5] for interrupt functionality.
In SMBus/SPI mode, this pin can be configured as an interrupt. This pin is asserted low when there is an
interrupt and goes back high when the interrupt status register is read. There are 7 separate masks for different
interrupt sources. These interrupt sources are:
1. If there is a LOS transition on IN0, irrespective of the input channel selected (2 separate masks).
2. If there is a LOS transition on IN1, irrespective of the input channel selected (2 separate masks).
3. HEO or VEO goes below a certain threshold as specified in the registers (1 mask).
4. Lock transition, whether it is asserted or de-asserted – disabled by default (2 mask).
7.3.7.4 LOCK
Indicates the lock status of the CDR. When CDR is locked this pin is asserted high.
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7.3.7.5 SMBus MODE
The SMBus interface can also be used to control the device. If pin 1 (MODE_SEL) is pulled low through 1 kΩ to
GND, then Pins 3, 4 are configured as the SMBUS_SCL and SMBUS_SDA respectively. Pins 2, 15 are address
straps, ADDR0/ADDR1 respectively, during power up.
The maximum operating speed supported on the SMBus pins is 400 kHz.
Table 4. SMBus MODE
ADDR0
ADDR1
ADDR0 [BINARY]
ADDR1 [BINARY]
7-Bit SLAVE
ADDRESS [HEX]
8-Bit WRITE
COMMAND [HEX]
1 kΩ to GND
1 kΩ to GND
00
00
0D
1A
1 kΩ to GND
20 kΩ to GND
00
01
0E
1C
1 kΩ to GND
Float
00
10
0F
1E
1 kΩ to GND
1 kΩ to VDD
00
11
10
20
20 kΩ to GND
1 kΩ to GND
01
00
11
22
20 kΩ to GND
20 kΩ to GND
01
01
12
24
20 kΩ to GND
Float
01
10
13
26
20 kΩ to GND
1 kΩ to VDD
01
11
14
28
Float
1 kΩ to GND
10
00
15
2A
Float
20 kΩ to GND
10
01
16
2C
Float
Float
10
10
17
2E
Float
1 kΩ to VDD
10
11
18
30
1 kΩ to VDD
1 kΩ to GND
11
00
19
32
1 kΩ to VDD
20 kΩ to GND
11
01
1A
34
1 kΩ to VDD
Float
11
10
1B
36
1 kΩ to VDD
1 kΩ to VDD
11
11
1C
38
Note: These are 7 bit addresses. Therefore, the LSB must be added to indicate read/write. LSB equal to zero
indicates write and 1 indicates SMBus read operation. For example, for 7 bit hex address 0x0D, the I2C hex
address byte is 0x1A to write and 0X1B to read.
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7.3.7.6 SMBus READ/WRITE Transaction
The System Management Bus (SMBus) is a two-wire serial interface through which various system component
chips can communicate with the master. Slave devices are identified by having a unique device address. The
two-wire serial interface consists of SCL and SDA signals. SCL is a clock output from the Master to all of the
Slave devices on the bus. SDA is a bidirectional data signal between the Master and Slave devices. The
LMH1218 SMBUS SCL and SDA signals are open drain and require external pull up resistors.
Start and Stop:
The Master generates Start and Stop conditions at the beginning and end of each transaction.
• Start: High to low transition (falling edge) of SDA while SCL is high
• Stop: Low to high transition (rising edge) of SDA while SCL is high
Figure 9. Start and Stop Conditions
The Master generates 9 clock pulses for each byte transfer. The 9th clock pulse constitutes the ACK cycle. The
transmitter releases SDA to allow the receiver to send the ACK signal. An ACK is when the device pulls SDA
low, while a NACK is recorded if the line remains high.
Figure 10. Acknowledge (ACK)
20
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Writing data from a master to a slave comprises of 3 parts as noted in figure Figure 11
• The master begins with start condition followed by the slave device address with the R/W bit cleared
• The 8-bit register address that will be written
• The data byte to write
Figure 11. SMBus Write Operation
SMBus read operation consists of four parts
• The master initiates the read cycle with start condition followed by slave device address with the R/W bit
cleared
• The 8-bit register address that is to be read
• After acknowledgment from the slave, the master initiates a re-start condition
• The slave device address is resent followed with R/W bit set
• After acknowledgment from the slave, the data is read back from the slave to the master. The last ACK is
high if there are no more bytes to read
Figure 12. SMBus Read Operation
tLOW
tR
tHIGH
SCL
tHD:STA
tHD:DAT
tBUF
tF
tSU:STA
tSU:DAT
See
*
Note
tSU:STO
SDA
SP
ST
ST
SP
Figure 13. SMBus Timing Parameters
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7.3.7.7 SPI Mode
The SPI (Serial Peripheral Interface) bus standard can be used to control the device. The SPI Mode is enabled
when MODE_SEL Pin 1 is pulled high through the 1-kΩ resistor. The SPI bus comprises of 4 pins: Pin 2, Pin 3,
Pin 4, and Pin 15:
1. MOSI Pin 4: Master Output Slave Input. Configured as toggling input.
2. MISO Pin 15: Master Input, Slave Output: Configured as a toggling output
3. SS_N Pin 2: Slave Select (active low). Configured as toggling input.
4. SCK Pin 3: Serial clock (output from master). Configured as toggling input.
The maximum operating speed supported on the SPI bus is 20 MHz.
7.3.7.7.1 SPI READ/WRITE Transaction
Each SPI transaction to a single device is 17 bits long and is framed by SS_N asserted low. The MOSI input is
ignored and the MISO output is floated whenever SS_N is de-asserted (High).
The bits are shifted in left-to-right. The first bit is R/W, so it is 1 for reads and 0 for writes. Bits A7-A0 are the 8-bit
register address, and bits D7-D0 are the 8-bit read or write data. The prior SPI command, address, and data are
shifted out on MISO as the current command, address, and data are shifted in on MOSI. In all SPI transactions,
the MISO output signal is enabled asynchronously when SS_N becomes asserted.
R/W
A7
A6
A5
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
Figure 14. MOSI
7.3.7.7.2 SPI Write Transaction Format
For SPI writes, the R/W bit is 0. SPI write transactions are 17 bits per device, and the command is executed on
the rising edge of SS_N, as shown in Figure 15. The SPI transaction always starts on the rising edge of the
clock.
Figure 15. MOSI
0
A7
A6
A5
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
The signal timing for a SPI Write transaction is shown in Figure 16. The “prime” values on MISO (for example,
A7‟) reflect the contents of the shift register from the previous SPI transaction, and are a "don’t-care" for the
current transaction.
tSSOF
SS_N
tSSH
tSSSU
tPH
tPL
SCK
tH
tSU
MOSI
A7
A6
A5
A4
A3
A2
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
HiZ
0
todz
MISO
HiZ
R/W'
A7'
A6'
A5'
A4'
A3'
A2'
A1'
A0'
D7'
D6'
D5'
D4'
D3'
D2'
D1'
D0'
Figure 16. Signal Timing for a SPI Write Transaction
22
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7.3.7.7.3 SPI Read Transaction Format
A SPI read transaction is 34 bits per device consisting of two 17 bits frames. The first 17-bit read transaction, first
frame, shifts in the address to be read, followed by a dummy transaction, second frame, to shift out 17-bit read
data. The R/W bit is 1 for the read transaction, as shown in Figure 17.
The first 17 bits from the read transaction specifies 1-bit of RW and 8-bits of address A7-A0 in the first 8 bits. The
eight 1’s following the address are ignored. The second dummy transaction acts like a read operation on address
0xFF and needs to be ignored. However, the transaction is necessary in order to shift out the read data D7-D0 in
the last 8 bits of the MISO output.
The signal timing for a SPI Read Transaction is shown in Figure 17. As with the SPI Write, the “prime” values on
MISO during the first 16 clocks are a don’t-care for this portion of the transaction. Note, however, that the values
shifted out on MISO during the last 17 clocks reflect the read address and 8-bit read data for the current
transaction.
SS_N
(host)
tSSOF
tSSSU
tPH
tSSOF
tSSH
tPL
SCK
(host)
tH
MOSI
(host)
1
A7
A6
A5
³17X1´
³8X1´
tSU
A4
A3
A2
A1
A0
'RQ¶W &DUH
1
A
7
todz
tod
tozd
MISO
(device)
A
6
A
5
A
4
A
3
A
2
A
1
A
0
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
Figure 17. Signal Timing for a SPI Read Transaction
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7.3.7.8 SPI Daisy Chain
The LMH1218 includes an enhanced SPI controller that supports daisy-chaining the serial configuration data
among multiple LMH1218 devices. The LMH1218 device supports SPI Daisy Chain between devices with an 8bit SPI addressing scheme. Each LMH1218 device is directly connected to the SCK and SS_N pins of the Host.
However, only the first LMH1218 device in the chain is connected to the Host’s MOSI pin, and only the last
device in the chain is connected to the Host’s MISO pin. The MOSI pin of each intermediate LMH1218 device in
the chain is connected to the MISO pin of the previous LMH1218 device, thereby creating a serial shift register.
This architecture is shown in Figure 18:
MISO
Device 2
Device 3
Device N
LMH1218
LMH1218
LMH1218
LMH1218
MOSI
MISO
SS_N
...
MISO
SCK
MOSI
SS_N
MISO
SCK
MOSI
SS_N
MISO
SCK
MOSI
SCK
MOSI
Device 1
SS_N
Host
SCK
SS
Figure 18. Daisy-Chain Configuration
In a daisy-chain configuration of N LMH1218 devices, the Host conceptually sees a long shift register of length
17xN. Therefore the length of a Basic SPI Transaction, as described above, is 17xN; in other words, SS_N is
asserted for 17xN clock cycles.
7.3.7.8.1 SPI Daisy Chain Write Example
The following example make some assumptions:
The daisy-chain is 3 LMH1218 devices long, comprising Devices 1, 2, and 3 as shown in Figure 18. Therefore,
each Basic SPI Transaction is 17x3 = 51 clocks long.
In Figure 19, the following occurs at the end of the transaction:
• Write 0x5A to register 0x12 in Device 3
• Write 0x3C to register 0x34 in Device 2
• Write 0x00 to register 0x56 in Device 1
Note that the bits are shifted out of MOSI left to right. The MISO pin is not shown as it reflects shift register
contents from a prior transaction.
MOSI
(Write)
0
0x12
0x5A
0
0x34
0x3C
0
0x56
0x00
Figure 19. MOSI Write
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7.3.7.8.2 SPI Daisy Chain Write Read Example
In Figure 20 and Figure 21, the following occurs at the end of the first transaction:
• Write 0x22 to register 0x01 in Device 3
• Latch the data from register 0x34 in Device 2
• Write 0x44 to register 0x76 in Device 1
MOSI
(Host)
0
0x01
0x22
1
0x34
0xFF
0
0x76
0x44
Figure 20. SPI Daisy Chain Write Read First Frame Illustration
MOSI
(Host)
1
0xFF
0xFF
1
0xFF
0xFF
1
0xFF
0xFF
MISO
(Host)
0
0x01
0x22
1
0x34
0x3C
0
0x76
0x44
Figure 21. SPI Daisy Chain Write Read second Frame Illustration
7.3.7.8.2.1 SPI Daisy Chain Length of Daisy Chain Illustration
A useful operation for the Host may be to detect the length of the daisy-chain. This is a simple matter of shifting
in a series of known data values (0x7F, 0xAA) in the example in Figure 22. After N+1 writes, the known data
value will begin to appear on the Host's MISO pin.
MOSI
(Host)
1
0x7F
0xAA
1
0x7F
0xAA
1
0x7F
0xAA
MISO
(Host)
x
xx
xx
x
xx
xx
1
0x7F
0xAA
Figure 22. MOSI (Host)
7.3.8 Power-On Reset
The LMH1218 has an internal power-on reset (PoR) circuitry which initiates a self-clearing reset after the power
is applied to the VDD pins.
7.4 Device Functional Modes
The LMH1218 features can be programmed via SPI, or SMBus interface. LMH1218 Device Configuration
describes detailed operation using SPI, or SMBus interface.
7.5 Programming
For more information on device programming, refer to LMH1218 Programming Guide (SNLU174). Register
initialization is required at power-up or after reset. See Initialization Set Up
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7.6 Register Maps
The LMH1218 register set definition is divided into four groups:
1. Global Registers: Chip ID, Interrupt status, LOS registers
2. Receiver Registers: Equalizer boost settings and signal detect setting
3. CDR Registers: PLL control
4. Transmitter Registers: OUT0 and OUT1 parameter setting
Additionally, the global register is divided into share and channel registers. Share registers define chip ID, device
revision while channel registers are feature-specific.
The typical device initialization sequence for the LMH1218 includes the followings. For detailed register settings
refer to LMH1218 Programming Guide (SNLU174).
1. Shared Register Configuration
(a) Reading device ID
(b) Selecting interrupt on to LOS pin
(c) Settings up the register to access the channel registers
2. Channel Register Configuration
(a) CDR Reset
(b) Interrupt register configuration
(c) CDR data rate selection
(d) Optional Input/Output selection
(e) Optional VOD selection
(f) CDR Reset and Release
26
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Register Maps (continued)
7.6.1 Global Registers
Table 5. Global Registers
REGISTER NAME
BITS
SMBus Observation
FIELD REGISTER
ADDRESS
Reg_0x00 Share
DEFAULT
R/RW
0x00
SMBus Address Observation
7
SMBUS_addr3
0
R
6
SMBUS_addr2
0
R
5
SMBUS_addr1
0
R
4
SMBUS_addr0
0
R
3
Reserved
0
RW
2
Reserved
0
RW
1
Reserved
0
RW
0
Reserved
0
RW
Reset Shared Regs
Reg 0x04 Share
7
6
Reserved
rst_i2c_regs
0x01
0
RW
0
RW
Reserved
0
RW
4
Reserved
0
RW
3
Reserved
0
RW
2
Reserved
0
RW
1
Reserved
0
RW
0
Reserved
1
RW
Reg 0x06 Share
0x00
Reserved
0
RW
6
Reserved
0
RW
5
Reserved
0
RW
4
Reserved
0
RW
3
Test control[3]
0
RW
2
Test control[2]
0
RW
1
Test control[1]
0
RW
0
Test control[0]
0
RW
Reg 0xF0 Share
1: Reset Shared Registers
0: Normal operation
Allow SMBus strap observation
7
Device Version
SMBus strap observation
Shared Register Reset
5
Enable SMBus Strap
DESCRIPTION
0x01
Set to >9 to allow strap observation on
share reg 0x00
Device Version
7
VERSION[7]
0
RW
6
VERSION[6]
0
RW
5
VERSION[5]
0
RW
4
VERSION[4]
0
RW
3
VERSION[3]
0
RW
2
VERSION[2]
0
RW
1
VERSION[1]
0
RW
0
VERSION[0]
1
RW
Device revision
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Register Maps (continued)
Table 5. Global Registers (continued)
REGISTER NAME
FIELD REGISTER
ADDRESS
BITS
Device ID
Reg 0xF1 Share
DEFAULT
R/RW
0x60
Device ID
7
DEVICE_ID[7]
0
RW
6
DEVICE_ID[6]
1
RW
5
DEVICE_ID[5]
1
RW
4
DEVICE_ID[4]
0
RW
3
DEVICE_ID[3]
0
RW
2
DEVICE_ID[2]
0
RW
1
DEVICE_ID[1]
0
RW
0
DEVICE_ID[0]
0
RW
Channel Control
Reg 0xFF Control
0x00
Reserved
0
RW
6
Reserved
0
RW
0
RW
5
4
Reserved
0
RW
3
Reserved
0
RW
0
RW
2
en_ch_Access
1
Reserved
0
RW
0
Reserved
0
RW
Reset_Channel_Regs
Reg_0x00 Channel
Reserved
0
6
Reserved
0
5
Reserved
0
4
Reserved
0
3
Reserved
0
Rst_regs
2
Reserved
0
Reserved
LOS_status
0
0
Reg_0x01 Channel
0x00
Signal Detect Status
7
Reserved
0
RW
6
Reserved
0
RW
5
Reserved
0
RW
4
Reserved
0
RW
3
Reserved
0
RW
2
Reserved
0
RW
0
R
1: Loss of signal on IN1
0: Signal present on IN1
0
R
1: Loss of signal on IN0
0: Signal present on IN0
1
0
28
1: Enables access to channel registers
0: Enable access to share register
1: Reset Channel Registers ( self
clearing )
0: Normal operation
0
1
1: Selects interrupt onto LOS pin
0: Select signal detect onto LOS pin
Reset all Channel Registers to Default
Values
0x00
7
Device ID
Enable Channel Control
7
los_int_bus_sel
DESCRIPTION
LOS1
LOS0
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Register Maps (continued)
Table 5. Global Registers (continued)
REGISTER NAME
BITS
CDR_Status_1
FIELD REGISTER
ADDRESS
Reg_0x02 Channel
DEFAULT
R/RW
0x00
CDR Status
7
Reserved
0
R
6
Reserved
0
R
5
Reserved
0
R
4
cdr_status[4]
0
R
3
cdr_status[3]
0
R
2
Reserved
0
R
1
Reserved
0
R
0
Reserved
0
R
Interrupt Status Register
Reg 0x54 Channel
0x00
6
5
4
cdr_lock_int
signal_det1_int
signal_det0_int
0
R
1: Signal Detect from the selected input
asserted
0: Signal Detect from the selected input
de-asserted
0
R
1: CDR Lock interrupt
0: No interrupt from CDR Lock
0
R
1: IN1 Signal Detect interrupt
0: No interrupt from IN1 Signal Detect
0
R
1: IN0 Signal Detect interrupt
0: No interrupt from IN0 Signal Detect
0
R
1: HEO_VEO Threshold reached
interrupt
0: No interrupt from HEO_VEO
0
R
1: CDR loss of lock interrupt
0: No interrupt from CDR lock
0
R
1: IN1 Signal Detect loss interrupt
0: No interrupt from IN1 Signal Detect
0
R
1: IN0 Signal Detect loss interrupt
0: No interrupt from IN0 Signal Detect
heo_veo_int
3
2
1
0
cdr_lock_loss_int
signal_det1_loss_int
signal_det0_loss_int
11: CDR locked
00: CDR not locked
Interrupt Status ( clears upon read )
Sigdet
7
DESCRIPTION
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Register Maps (continued)
Table 5. Global Registers (continued)
REGISTER NAME
FIELD REGISTER
ADDRESS
BITS
Interrupt Control
Reg 0x56 Channel
7
Reserved
DEFAULT
R/RW
0x00
Interrupt Mask
0
RW
0
RW
1: Enable Interrupt if CDR lock is
achieved
0: Disable interrupt if CDR lock is
achieved
0
RW
1: Enable interrupt if IN1 Signal Detect
is asserted
0: Disable interrupt if IN1 Signal Detect
is asserted
RW
1: Enable interrupt if IN0 Signal Detect
is asserted
0: Disable interrupt if IN0 Signal Detect
is asserted
0
RW
1: Enable interrupt if HEO-VEO
threshold is reached
0: Disable interrupt due to HEO-VEO
threshold
0
RW
1: Enable interrupt if CDR loses lock
0: Disable interrupt if CDR loses lock
0
RW
1: Enable interrupt if there is loss of
signal on IN1
0: Disable interrupt if there is loss of
signal on IN1
0
RW
1: Enable interrupt if there is loss of
signal on IN0
0: Disable interrupt if there is loss of
signal on IN0
cdr_lock_int_en
6
signal_det1_int_en
5
signal_det0_int_en
4
0
heo_veo_int_en
3
2
cdr_lock_loss_int_en
signal_det1_loss_int_en
1
signal_det0_loss_int_en
0
30
DESCRIPTION
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7.6.2 Receiver Registers
Table 6. Receiver Registers
REGISTER NAME
BITS
EQ_Boost
FIELD REGISTER
ADDRESS
DEFAULT
R/RW
Reg 0x03 Channel
4 Stage EQ Boost Levels. Read-back
value going to CTLE in reg_0x52. Used
for setting EQ value when reg_0x2D[3] is
high
0x80
7
eq_BST0[1]
1
RW
6
eq_BST0[0]
0
RW
5
eq_BST1[1]
0
RW
4
eq_BST1[0]
0
RW
3
eq_BST2[1]
0
RW
2
eq_BST2[0]
0
RW
1
eq_BST3[1]
0
RW
0
eq_BST3[0]
0
RW
SD_EQ
Reg_0x0D Channel
0x00
Reserved
0
RW
6
Reserved
0
RW
5
Reserved
0
RW
4
Reserved
0
RW
3
Reserved
0
RW
2
Reserved
0
RW
1
Reserved
0
RW
Mr_auto_eq_en_bypass
EQ_SD_CONFIG
0
Reg 0x13 Channel
7
6
5
4
Reserved
sd_0_PD
sd_1_PD
Reserved
RW
0x90
2
1
0
Reserved
eq_en_bypass
Reserved
2 Bits control for stage 1 of the CTLE.
Adapts during CTLE adaptation
2 Bits control for stage 2 of the CTLE.
Adapts during CTLE adaptation
2 Bits control for stage 3 of the CTLE.
Adapts during CTLE adaptation
1: EQ Bypass for 270 Mbps
0: Use EQ Settings in reg0x03[7:0] for 270
Mbps
Note: If 0x13[1] mr_eq_en_bypass is set,
bypass would be set and auto-bypass has
no significance.
Channel EQ Bypass and Power Down
1
RW
0
RW
1: Power Down IN0 Signal Detect
0: IN0 Signal Detect normal operation
0
RW
1: Power Down IN1 Signal Detect
0: IN1 Signal Detect normal operation
1
RW
eq_PD_EQ
3
2 Bits control for stage 0 of the CTLE.
Adapts during CTLE adaptation
270 Mbps EQ Boost Setting
7
0
DESCRIPTION
0
RW
0
RW
0
RW
0
RW
Controls the power-state of the selected
channel. The un-selected channel is
always powered-down
1: Powers down selected channel EQ
stage
0: Powers up EQ of the selected channel
1: Bypass stage 3 and 4 of CTLE
0: Enable Stage 3 and 4 of CTLE
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Table 6. Receiver Registers (continued)
REGISTER NAME
FIELD REGISTER
ADDRESS
BITS
SD0_CONFIG
Reg 0x14 Channel
DEFAULT
R/RW
0x00
IN0 Signal Detect Threshold Setting
7
Reserved
0
RW
6
Reserved
0
RW
5
sd_0_refa_sel[1]
0
RW
4
sd_0_refa_sel[0]
0
RW
3
sd_0_refd_sel[1]
0
RW
2
sd_0_refd_sel[0]
0
RW
1
Reserved
0
RW
0
Reserved
0
RW
SD1_CONFIG
Reg_0x15 Channel
0x00
Reserved
0
RW
6
Reserved
0
RW
5
sd_1_refa_sel[1]
0
RW
4
sd_1_refa_sel[0]
0
RW
3
sd_1_refd_sel[1]
0
RW
2
sd_1_refd_sel[0]
0
RW
1
Reserved
0
RW
0
Reserved
0
RW
Reg_0x2D Channel
0x88
Reserved
1
RW
6
Reserved
0
RW
5
Reserved
0
RW
4
Reserved
0
RW
1
RW
reg_eq_bst_ov
2
Reserved
0
RW
1
Reserved
0
RW
0
Reserved
0
RW
CTLE Setting
Reg_0x31 Channel
7
Reserved
6
adapt_mode[1]
adapt_mode[0]
5
RW
00
RW
4
Reserved
0
RW
3
Reserved
0
RW
2
Reserved
0
RW
1
input_mux_ch_sel[1]
0
RW
0
RW
input_mux_ch_sel[0]
0
32
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1: Enable EQ boost over ride Note
LMH1218 Programming Guide (SNLU174)
0: Disable EQ boost over ride
CTLE Mode of Operation and Input/Output
Mux Selection
0x00
0
Controls signal detect SDH- Assert [5:4],
SDL- De-Assert [3:2], thresholds for IN1
0000: Default levels (nominal)
0101: Nominal -2 mV
1010: Nominal +5 mV
1111: Nominal +3 mV
EQ Boost Override
7
3
Controls signal detect SDH- Assert [5:4],
SDL- De-Assert [3:2], thresholds for IN0
0000: Default levels (nominal)
0101: Nominal -2 mV
1010: Nominal +5 mV
1111: Nominal +3 mV
IN1 Signal Detect Threshold Setting
7
EQ_BOOST_OV
DESCRIPTION
00: Normal Operation - Manual CTLE
Setting
01: Test Mode - Refer to the LMH1218
Programming Guide (SNLU174) for details
Other Settings - Invalid
IN0/1 and OUT0/1 selection
00: selects IN0 and OUT0/1
01: selects IN0 and OUT0
10: selects IN1 and OUT1
11: selects IN1 and OUT0/1
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Table 6. Receiver Registers (continued)
REGISTER NAME
BITS
LOW_RATE_
EQ_BST
FIELD REGISTER
ADDRESS
Reg 0x3A Channel
DEFAULT
R/RW
HD and SD EQ Level
0x00
7
fixed_eq_BST0[1]
0
RW
6
fixed_eq_BST0[0]
0
RW
5
fixed_eq_BST1[1]
0
RW
4
fixed_eq_BST1[0]
0
RW
3
fixed_eq_BST2[1]
0
RW
2
fixed_eq_BST2[0]
0
RW
1
fixed_eq_BST3[1]
0
RW
0
fixed_eq_BST3[0]
0
RW
BST_Indx0
Reg_0x40 Channel
DESCRIPTION
When CTLE is operating in test mode,
Reg 0x3A[7:0] forces fixed EQ setting for
data rates <= 3Gbps. In normal operating
manual mode Reg_0x03 forces EQ boost.
Note LMH1218 Programming Guide
(SNLU174) for details
Index0 4 Stage EQ Boost. Note LMH1218
Programming Guide (SNLU174)
0x00
7
I0_BST0[1]
0
RW
Index 0 Boost Stage 0 bit 1
6
I0_BST0[0]
0
RW
Index 0 Boost Stage 0 bit 0
5
I0_BST1[1]
0
RW
Index 0 Boost Stage 1 bit 1
4
I0_BST1[0]
0
RW
Index 0 Boost Stage 1 bit 0
3
I0_BST2[1]
0
RW
Index 0 Boost Stage 2 bit 1
2
I0_BST2[0]
0
RW
Index 0 Boost Stage 2 bit 0
1
I0_BST3[1]
0
RW
Index 0 Boost Stage 3 bit 1
0
I0_BST3[0]
0
RW
Index 0 Boost Stage 3 bit 0
BST_Indx1
Reg 0x41 Channel
0x40
Index1 4 Stage EQ Boost.
7
I1_BST0[1]
0
RW
Index 1 Boost Stage 0 bit 1
6
I1_BST0[0]
1
RW
Index 1 Boost Stage 0 bit 0
5
I1_BST1[1]
0
RW
Index 1 Boost Stage 1 bit 1
4
I1_BST1[0]
0
RW
Index 1 Boost Stage 1 bit 0
3
I1_BST2[1]
0
RW
Index 1 Boost Stage 2 bit 1
2
I1_BST2[0]
0
RW
Index 1 Boost Stage 2 bit 0
1
I1_BST3[1]
0
RW
Index 1 Boost Stage 3 bit 1
0
I1_BST3[0]
0
RW
Index 1 Boost Stage 3 bit 0
BST_Indx2
Reg 0x42 Channel
0x80
Index2 4 Stage EQ Boost.
7
I2_BST0[1]
1
RW
Index 2 Boost Stage 0 bit 1
6
I2_BST0[0]
0
RW
Index 2 Boost Stage 0 bit 0
5
I2_BST1[1]
0
RW
Index 2 Boost Stage 1 bit 1
4
I2_BST1[0]
0
RW
Index 2 Boost Stage 1 bit 0
3
I2_BST2[1]
0
RW
Index 2 Boost Stage 2 bit 1
2
I2_BST2[0]
0
RW
Index 2 Boost Stage 2 bit 0
1
I2_BST3[1]
0
RW
Index 2 Boost Stage 3 bit 1
0
I2_BST3[0]
0
RW
Index 2 Boost Stage 3 bit 0
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Table 6. Receiver Registers (continued)
REGISTER NAME
BST_Indx3
Reg 0x43 Channel
DEFAULT
R/RW
0x50
DESCRIPTION
Index3 4 Stage EQ Boost.
7
I3_BST0[1]
0
RW
Index 3 Boost Stage 0 bit 1
6
I3_BST0[0]
1
RW
Index 3 Boost Stage 0 bit 0
5
I3_BST1[1]
0
RW
Index 3 Boost Stage 1 bit 1
4
I3_BST1[0]
1
RW
Index 3 Boost Stage 1 bit 0
3
I3_BST2[1]
0
RW
Index 3 Boost Stage 2 bit 1
2
I3_BST2[0]
0
RW
Index 3 Boost Stage 2 bit 0
1
I3_BST3[1]
0
RW
Index 3 Boost Stage 3 bit 1
0
I3_BST3[0]
0
RW
Index 3 Boost Stage 3 bit 0
BST_Indx4
Reg 0x44 Channel
0xC0
Index4 4 Stage EQ Boost.
7
I4_BST0[1]
1
RW
Index 4 Boost Stage 0 bit 1
6
I4_BST0[0]
1
RW
Index 4 Boost Stage 0 bit 0
5
I4_BST1[1]
0
RW
Index 4 Boost Stage 1 bit 1
4
I4_BST1[0]
0
RW
Index 4 Boost Stage 1 bit 0
3
I4_BST2[1]
0
RW
Index 4 Boost Stage 2 bit 1
2
I4_BST2[0]
0
RW
Index 4 Boost Stage 2 bit 0
1
I4_BST3[1]
0
RW
Index 4 Boost Stage 3 bit 1
0
I4_BST3[0]
0
RW
Index 4 Boost Stage 3 bit 0
BST_Indx5
Reg 0x45 Channel
0x90
Index5 4 Stage EQ Boost.
7
I5_BST0[1]
1
RW
Index 5 Boost Stage 0 bit 1
6
I5_BST0[0]
0
RW
Index 5 Boost Stage 0 bit 0
5
I5_BST1[1]
0
RW
Index 5 Boost Stage 1 bit 1
4
I5_BST1[0]
1
RW
Index 5 Boost Stage 1 bit 0
3
I5_BST2[1]
0
RW
Index 5 Boost Stage 2 bit 1
2
I5_BST2[0]
0
RW
Index 5 Boost Stage 2 bit 0
1
I5_BST3[1]
0
RW
Index 5 Boost Stage 3 bit 1
0
I5_BST3[0]
0
RW
Index 5 Boost Stage 3 bit 0
BST_Indx6
Reg 0x46 Channel
0x54
Index6 4 Stage EQ Boost.
7
I6_BST0[1]
0
RW
Index 6 Boost Stage 0 bit 1
6
I6_BST0[0]
1
RW
Index 6 Boost Stage 0 bit 0
5
I6_BST1[1]
0
RW
Index 6 Boost Stage 1 bit 1
4
I6_BST1[0]
1
RW
Index 6 Boost Stage 1 bit 0
3
I6_BST2[1]
0
RW
Index 6 Boost Stage 2 bit 1
2
I6_BST2[0]
1
RW
Index 6 Boost Stage 2 bit 0
1
I6_BST3[1]
0
RW
Index 6 Boost Stage 3 bit 1
0
I6_BST3[0]
0
RW
Index 6 Boost Stage 3 bit 0
BST_Indx7
34
FIELD REGISTER
ADDRESS
BITS
Reg 0x47 Channel
0xA0
Index7 4 Stage EQ Boost.
7
I7_BST0[1]
1
RW
Index 7 Boost Stage 0 bit 1
6
I7_BST0[0]
0
RW
Index 7 Boost Stage 0 bit 0
5
I7_BST1[1]
1
RW
Index 7 Boost Stage 1 bit 1
4
I7_BST1[0]
0
RW
Index 7 Boost Stage 1 bit 0
3
I7_BST2[1]
0
RW
Index 7 Boost Stage 2 bit 1
2
I7_BST2[0]
0
RW
Index 7 Boost Stage 2 bit 0
1
I7_BST3[1]
0
RW
Index 7 Boost Stage 3 bit 1
0
I7_BST3[0]
0
RW
Index 7 Boost Stage 3 bit 0
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Table 6. Receiver Registers (continued)
REGISTER NAME
BITS
BST_Indx8
FIELD REGISTER
ADDRESS
Reg 0x48 Channel
DEFAULT
R/RW
0xB0
DESCRIPTION
Index8 4 Stage EQ Boost.
7
I8_BST0[1]
1
RW
Index 8 Boost Stage 0 bit 1
6
I8_BST0[0]
0
RW
Index 8 Boost Stage 0 bit 0
5
I8_BST1[1]
1
RW
Index 8 Boost Stage 1 bit 1
4
I8_BST1[0]
1
RW
Index 8 Boost Stage 1 bit 0
3
I8_BST2[1]
0
RW
Index 8 Boost Stage 2 bit 1
2
I8_BST2[0]
0
RW
Index 8 Boost Stage 2 bit 0
1
I8_BST3[1]
0
RW
Index 8 Boost Stage 3 bit 1
0
I8_BST3[0]
0
RW
Index 8 Boost Stage 3 bit 0
0X95
0x95
Index9 4 Stage EQ Boost.
BST_Indx9
Reg 0x49 Channel
7
I9_BST0[1]
1
RW
Index 9 Boost Stage 0 bit 1
6
I9_BST0[0]
0
RW
Index 9 Boost Stage 0 bit 0
5
I9_BST1[1]
0
RW
Index 9 Boost Stage 1 bit 1
4
I9_BST1[0]
1
RW
Index 9 Boost Stage 1 bit 0
3
I9_BST2[1]
0
RW
Index 9 Boost Stage 2 bit 1
2
I9_BST2[0]
1
RW
Index 9 Boost Stage 2 bit 0
1
I9_BST3[1]
0
RW
Index 9 Boost Stage 3 bit 1
0
I9_BST3[0]
1
RW
Index 9 Boost Stage 3 bit 0
BST_Indx10
Reg 0x4A Channel
0x69
Index10 4 Stage EQ Boost.
7
I10_BST0[1]
0
RW
Index 10 Boost Stage 0 bit 1
6
I10_BST0[0]
1
RW
Index 10 Boost Stage 0 bit 0
5
I10_BST1[1]
1
RW
Index 10 Boost Stage 1 bit 1
4
I10_BST1[0]
0
RW
Index 10 Boost Stage 1 bit 0
3
I10_BST2[1]
1
RW
Index 10 Boost Stage 2 bit 1
2
I10_BST2[0]
0
RW
Index 10 Boost Stage 2 bit 0
1
I10_BST3[1]
0
RW
Index 10 Boost Stage 3 bit 1
0
I10_BST3[0]
1
RW
Index 10 Boost Stage 3 bit 0
BST_Indx11
Reg 0x4B Channel
0xD5
Index11 4 Stage EQ Boost.
7
I11_BST0[1]
1
RW
Index 11 Boost Stage 0 bit 1
6
I11_BST0[0]
1
RW
Index 11 Boost Stage 0 bit 0
5
I11_BST1[1]
0
RW
Index 11 Boost Stage 1 bit 1
4
I11_BST1[0]
1
RW
Index 11 Boost Stage 1 bit 0
3
I11_BST2[1]
0
RW
Index 11 Boost Stage 2 bit 1
2
I11_BST2[0]
1
RW
Index 11 Boost Stage 2 bit 0
1
I11_BST3[1]
0
RW
Index 11 Boost Stage 3 bit 1
0
I11_BST3[0]
1
RW
Index 11 Boost Stage 3 bit 0
BSTIndx12
Reg 0x4C Channel
0x99
Index12 4 Stage EQ Boost.
7
I12_BST0[1]
1
RW
Index 12 Boost Stage 0 bit 1
6
I12_BST0[0]
0
RW
Index 12 Boost Stage 0 bit 0
5
I12_BST1[1]
0
RW
Index 12 Boost Stage 1 bit 1
4
I12_BST1[0]
1
RW
Index 12 Boost Stage 1 bit 0
3
I12_BST2[1]
1
RW
Index 12 Boost Stage 2 bit 1
2
I12_BST2[0]
0
RW
Index 12 Boost Stage 2 bit 0
1
I12_BST3[1]
0
RW
Index 12 Boost Stage 3 bit 1
0
I12_BST3[0]
1
RW
Index 12 Boost Stage 3 bit 0
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Table 6. Receiver Registers (continued)
REGISTER NAME
BST_Indx13
Reg 0x4D Channel
DEFAULT
R/RW
0xA5
DESCRIPTION
Index13 4 Stage EQ Boost.
7
I13_BST0[1]
1
RW
Index 13 Boost Stage 0 bit 1
6
I13_BST0[0]
0
RW
Index 13 Boost Stage 0 bit 0
5
I13_BST1[1]
1
RW
Index 13 Boost Stage 1 bit 1
4
I13_BST1[0]
0
RW
Index 13 Boost Stage 1 bit 0
3
I13_BST2[1]
0
RW
Index 13 Boost Stage 2 bit 1
2
I13_BST2[0]
1
RW
Index 13 Boost Stage 2 bit 0
1
I13_BST3[1]
0
RW
Index 13 Boost Stage 3 bit 1
0
I13_BST3[0]
1
RW
Index 13 Boost Stage 3 bit 0
BST_Indx14
Reg 0x4E Channel
0xE6
Index14 4 Stage EQ Boost.
7
I14_BST0[1]
1
RW
Index 14 Boost Stage 0 bit 1
6
I14_BST0[0]
1
RW
Index 14 Boost Stage 0 bit 0
5
I14_BST1[1]
1
RW
Index 14 Boost Stage 1 bit 1
4
I14_BST1[0]
0
RW
Index 14 Boost Stage 1 bit 0
3
I14_BST2[1]
0
RW
Index 14 Boost Stage 2 bit 1
2
I14_BST2[0]
1
RW
Index 14 Boost Stage 2 bit 0
1
I14_BST3[1]
1
RW
Index 14 Boost Stage 3 bit 1
0
I14_BST3[0]
0
RW
Index 14 Boost Stage 3 bit 0
BST_Indx15
Reg 0x4F Channel
0xF9
Index15 4 Stage EQ Boost.
7
I15_BST0[1]
1
RW
Index 15 Boost Stage 0 bit 1
6
I15_BST0[0]
1
RW
Index 15 Boost Stage 0 bit 0
5
I15_BST1[1]
1
RW
Index 15 Boost Stage 1 bit 1
4
I15_BST1[0]
1
RW
Index 15 Boost Stage 1 bit 0
3
I15_BST2[1]
1
RW
Index 15 Boost Stage 2 bit 1
2
I15_BST2[0]
0
RW
Index 15 Boost Stage 2 bit 0
1
I15_BST3[1]
0
RW
Index 15 Boost Stage 3 bit 1
0
I15_BST3[0]
1
RW
Index 15 Boost Stage 3 bit 0
Active_EQ
Reg 0x52 Channel
0x00
Active CTLE Boost Setting Read Back
7
eq_bst_to_ana[7]
0
R
6
eq_bst_to_ana[6]
0
R
5
eq_bst_to_ana[5]
0
R
4
eq_bst_to_ana[4]
0
R
3
eq_bst_to_ana[3]
0
R
2
eq_bst_to_ana[2]
0
R
1
eq_bst_to_ana[1]
0
R
0
eq_bst_to_ana[0]
0
R
EQ_Control
Reg 0x55 Channel
0x00
Reserved
0
R
6
Reserved
0
RW
5
Reserved
0
RW
4
Reserved
0
RW
3
Reserved
0
RW
2
Reserved
0
RW
0
RW
0
RW
0
Reserved
Reserved
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Read-back returns CTLE boost settings
Low Rate <=3G EQ Adaptation Control
7
1
36
FIELD REGISTER
ADDRESS
BITS
At power-up, this bit needs to be set to
1'b. See initialization set up
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SNLS474B – FEBRUARY 2015 – REVISED FEBRUARY 2016
7.6.3 CDR Registers
Table 7. CDR Registers
REGISTER
NAME
BITS
Output_Mux_OV
FIELD REGISTER
ADDRESS
Reg 0x09 Channel
DEFAULT
R/RW
0x00
Output Data Mux Override
7
Reserved
0
RW
6
Reserved
0
RW
5
Reg_bypass_pfd_ovd
0
RW
4
Reserved
0
RW
3
Reserved
0
RW
2
Reserved
0
RW
1
Reserved
0
RW
0
Reserved
0
RW
CDR_Reset
Reg 0x0A Channel
DESCRIPTION
0x50
1: Enable values from 0x1E[7:5] &
0x1C[7:5] to control output mux
0: Register 0x1C[3:2] determines the
output selection
CDR State Machine Reset
7
Reserved
0
RW
6
Reserved
1
RW
5
Reserved
0
RW
4
Reserved
1
RW
3
reg_cdr_reset_ov
0
RW
1: Enable 0x0A[2] to control CDR Reset
0: Disable CDR Reset
2
reg_cdr_reset_sm
0
RW
1: Enable CDR Reset if 0x0A[3] = 1'b
0: Disable CDR Reset if 0x0A[3] = 1'b
1
Reserved
0
RW
0
Reserved
0
RW
CDR_Status
Reg 0x0C Channel
0x08
CDR Status Control
7
reg_sh_status_control[3]
0
RW
6
reg_sh_status_control[2]
0
RW
5
reg_sh_status_control[1]
0
RW
4
reg_sh_status_control[0]
0
RW
3
Reserved
1
RW
2
Reserved
0
RW
1
Reserved
0
RW
0
Reserved
0
RW
EOM_Vrange
Reg 0x11 Channel
7
eom_sel_vrange[1]
6
eom_sel_vrange[0]
5
Determines what is shown in Reg 0x02.
Note LMH1218 Programming Guide
(SNLU174)
EOM Vrange Setting and EOM Power
Down Control
0xE0
11
RW
Sets eye monitor ADC granularity if
0x2C[6] =0'b
00: 3.125 mV
01: 6.25 mV
10: 9.375 mV
11: 12.5 mV
eom_PD
1
RW
0: EOM Operational
1: Power down EOM
4
Reserved
0
RW
3
Reserved
0
RW
2
Reserved
0
RW
1
Reserved
0
RW
0
Reserved
0
RW
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Table 7. CDR Registers (continued)
REGISTER
NAME
Full Temperature
Range
Reg 0x16 Channel
DEFAULT
R/RW
0x7A
Reserved
0
RW
6
Reserved
1
RW
5
Reserved
1
RW
4
Reserved
1
RW
3
Reserved
1
RW
2
Reserved
0
RW
1
Reserved
1
RW
0
Reserved
0
RW
Reg 0x23 Channel
eom_get_heo_veo_ov
0
RW
6
Reserved
1
RW
5
Reserved
0
RW
4
Reserved
0
RW
3
Reserved
0
RW
2
Reserved
0
RW
1
Reserved
0
RW
0
Reserved
0
RW
0x00
0x00
Reg 0x24 Channel
At power-up, this register needs to be set
to 0x25. See initialization set up
0x40
7
EOM_CNTL
DESCRIPTION
Temperature Range Setting
7
HEO_VEO_OV
1: Enable reg 0x24[1] to acquire HEO/VEO
0: Disable reg 0x24[1] to acquire HEO/VEO
Eye Opening Monitor Control Register
1: Enable Fast EOM mode
0: Disable fast EOM mode
7
fast_eom
0
R
6
Reserved
0
R
5
get_heo_veo_error_no_hits
0
R
1: No zero crossing in the eye diagram
observed
0: Zero crossing in the eye diagram
detected
4
get_heo_veo_error_no_ope
ning
0
R
1: Eye diagram is completely closed
0: Open eye diagram detected
3
Reserved
0
R
2
Reserved
0
R
1
eom_get_heo_veo
0
RW
Acquire HEO & VEO(self-clearing)
0
eom_start
0
R
Starts EOM counter(self-clearing)
EOM_MSB
38
FIELD REGISTER
ADDRESS
BITS
Reg 0x25 Channel
0x00
Eye opening monitor hits(MSB)
7
eom_count[15]
0
RW
6
eom_count[14]
0
RW
5
eom_count[13]
0
RW
4
eom_count[12]
0
RW
3
eom_count[11]
0
RW
2
eom_count[10]
0
RW
1
eom_count[9]
0
RW
0
eom_count[8]
0
RW
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MSBs of EOM counter
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Table 7. CDR Registers (continued)
REGISTER
NAME
BITS
EOM_LSB
FIELD REGISTER
ADDRESS
Reg 0x26 Channel
DEFAULT
R/RW
0x00
Eye opening monitor hits(LSB)
7
eom_count[7]
0
RW
6
eom_count[6]
0
RW
5
eom_count[5]
0
RW
4
eom_count[4]
0
RW
3
eom_count[3]
0
RW
2
eom_count[2]
0
RW
1
eom_count[1]
0
RW
0
eom_count[0]
0
RW
HEO
Reg 0x27 Channel
0x00
heo[7]
0
R
6
heo[6]
0
R
5
heo[5]
0
R
4
heo[4]
0
R
3
heo[3]
0
R
2
heo[2]
0
R
1
heo[1]
0
R
0
heo[0]
0
R
Reg 0x28 Channel
0x00
veo[7]
0
R
6
veo[6]
0
R
5
veo[5]
0
R
4
veo[4]
0
R
3
veo[3]
0
R
2
veo[2]
0
R
1
veo[1]
0
R
0
veo[0]
0
R
Reg 0x29 Channel
7
Reserved
6
eom_vrange_setting[1]
5
eom_vrange_setting[0]
4
3
0x00
0
HEO value. This is measured in 0-63
phase settings. To get HEO in UI, read
HEO, convert hex to dec, then divide by
64.
Vertical Eye Opening
7
Auto_EOM _Vrange
LSBs of EOM counter
Horizontal Eye Opening
7
VEO
DESCRIPTION
This is measured in 0-63 vertical steps. To
get VEO in mV, read VEO, convert hex to
dec, then multiply by 3.125mV
EOM Vrange Readback
RW
00
R
Reserved
0
RW
Reserved
0
RW
2
Reserved
0
RW
1
Reserved
0
RW
0
Reserved
0
RW
Auto Vrange readback of eye monitor
granularity
00: 3.125mV
01: 6.25mV
10: 9.375mV
11: 12.5mV
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Table 7. CDR Registers (continued)
REGISTER
NAME
EOM_Timer_Thr
Reg 0x2A Channel
DEFAULT
R/RW
0x30
eom_timer_thr[7]
0
RW
6
eom_timer_thr[6]
0
RW
5
eom_timer_thr[5]
1
RW
4
eom_timer_thr[4]
1
RW
3
eom_timer_thr[3]
0
RW
2
eom_timer_thr[2]
0
RW
1
eom_timer_thr[1]
0
RW
0
eom_timer_thr[0]
0
RW
Reg 0x2C Channel
0x32
Reserved
0
RW
6
veo_scale
0
RW
5
Reserved
1
RW
4
Reserved
1
RW
3
Reserved
0
RW
2
Reserved
0
RW
1
Reserved
1
RW
0
Reserved
0
RW
Reg_0x2F Channel
0x06
RATE[1]
0
RW
6
RATE[0]
0
RW
5
Reserved
0
RW
4
Reserved
0
RW
3
Reserved
0
RW
2
Reserved
1
RW
1
Reserved
1
RW
0
Reserved
0
R
Reg 0x32 Channel
0x11
00: SMPTE Enable
01: 10G Ethernet Enable
Other Settings - Invalid
HEO/VEO Interrupt Threshold
7
heo_int_thresh[3]
0
RW
6
heo_int_thresh[2]
0
RW
5
heo_int_thresh[1]
0
RW
4
heo_int_thresh[0]
1
RW
3
veo_int_thresh[3]
0
RW
2
veo_int_thresh[2]
0
RW
1
veo_int_thresh[1]
0
RW
0
veo_int_thresh[0]
1
RW
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1: Enable Auto VEO scaling
0: VEO scaling based on Vrange Setting
(0x11[7:6])
SMPTE_10GbE Selection
7
HEO VEO Threshold
EOM timer for how long to check each
phase/voltage setting
VEO_Scale
7
Rate_Subrate
DESCRIPTION
EOM Hit Timer
7
VEO_Scale
40
FIELD REGISTER
ADDRESS
BITS
Compares HEO value, 0x27[7:0], vs
threshold 0x32[7:4] * 4
Compares VEO value, 0x28[7:0], vs
threshold 0x32[3:0 * 4
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Table 7. CDR Registers (continued)
REGISTER
NAME
BITS
CDR State Machine
Control
FIELD REGISTER
ADDRESS
Reg 0x3E Channel
DEFAULT
R/RW
0x80
CDR State Machine Setting
7
Reserved
1
RW
6
Reserved
0
RW
5
Reserved
0
RW
4
Reserved
0
RW
3
Reserved
0
RW
2
Reserved
0
RW
1
Reserved
0
RW
0
Reserved
0
RW
HEO_VEO_Lock
Reg 0x69 Channel
0x0A
Reserved
0
RW
6
Reserved
0
RW
5
Reserved
0
RW
4
Reserved
0
RW
3
hv_lckmon_cnt_ms[3]
1
RW
2
hv_lckmon_cnt_ms[2]
0
RW
1
hv_lckmon_cnt_ms[1]
1
RW
0
hv_lckmon_cnt_ms[0]
0
RW
Reg 0x6A Channel
0x44
Reserved
0
RW
6
Reserved
1
RW
5
Reserved
0
RW
4
Reserved
0
RW
3
Reserved
0
RW
2
Reserved
1
RW
1
Reserved
0
RW
0
Reserved
0
RW
Reg 0xA0 Channel
While monitoring lock, this sets the interval
time. Each interval is 6.5 ms. At default
condition, HEO_VEO Lock Monitor occurs
once every 65 ms.
CDR State Machine Control
7
SMPTE_Rate_Enable
At power-up, this bit needs to be set to 0'b.
See initialization set up
HEO/VEO Interval Monitoring
7
CDR State Machine
Control
DESCRIPTION
0x1f
At power-up, this register should be set to
0x00. See initialization set up
SMPTE_Data_Rate_Lock_Restriction
7
Reserved
0
RW
6
Reserved
0
RW
5
Reserved
0
RW
4
dvb_enable
1
RW
1: Enable CDR Lock to 270 Mbps
0: Disable CDR Lock to 270 Mbps. Note
LMH1218 Programming Guide(SNLU174)
for details
3
hd_enable
1
RW
1: Enable CDR Lock to 1.485/1.4835 Gbps
0: Disable CDR Lock to 1.485/1.4835 Gbps
2
3G_enable
1
RW
1: Enable CDR Lock to 2.97/2.967 Gbps
0: Disable CDR Lock to 2.97/2.967 Gbps
1
6G_enable
1
RW
1: Enable CDR Lock to 5.94/5.934 Gbps
0: Disable CDR Lock to 5.94/5.934 Gbps
0
12G_enable
1
RW
1: Enable CDR Lock to 11.88/11.868 Gbps
0: Disable CDR Lock to 11.88/11.868 Gbps
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7.6.4 Transmitter Registers
Table 8. Transmitter Registers
REGISTER NAME
FIELD REGISTER
ADDRESS
BITS
Out0_Mux_Select
Reg 0x1C Channel
DEFAULT
R/RW
0x18
OUT0 Mux Selection
7
pfd_sel0_data_mux[2]
0
RW
6
pfd_sel0_data_mux[1]
0
RW
0
RW
pfd_sel0_data_mux[0]
5
VCO_Div40
4
3
mr_drv_out_ctrl[1]
1
RW
1
RW
0
RW
mr_drv_out_ctrl[0]
2
1
Reserved
0
RW
0
Reserved
0
RW
OUT1_Mux_Select
Reg 0x1E Channel
0xE9
pfd_sel_data_mux[2]
1
RW
6
pfd_sel_data_mux[1]
1
RW
1
RW
pfd_sel_data_mux[0]
42
4
Reserved
0
RW
3
Reserved
1
RW
2
Reserved
0
RW
1
Reserved
0
RW
0
Reserved
1
RW
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When 0x09[5] = 1'b OUT0 Mux
Selection can be controlled as follows:
000: Mute
001: 10 MHz Clock
010: Raw Data
100: Retimed Data
Other Settings - Invalid
When 0x09[5] = 1'b and 0x1E[[7:5] =
101'b OUT1 clock selection can be
controlled as follows:
1: OUT1 puts out line rate clock for 3G
and below and 297 MHz clock for 5.94
Gbps and 11.88Gbps
0: OUT1 puts out 10MHz clock
Controls both OUT0 and OUT1:
00:
OUT0: Mute
OUT1: Mute
01:
OUT0: Locked Reclocked Data /
Unlocked Raw Data
OUT1: Locked Output Clock / Unlocked
Mute
10:
OUT0: Locked Reclocked Data /
Unlocked RAW
OUT1: Locked Reclocked Data /
Unlocked Raw
11:
OUT0: Forced Raw
OUT1: Forced Raw
OUT1 Mux Selection
7
5
DESCRIPTION
When 0x09[5] = 1'b OUT0 Mux
Selection can be controlled as follows:
111: Mute
101: 10MHz Clock if reg 0x1c[4]=0 and
divided by 40 if reg 0x1c[4] = 1
010: Full Rate Clock
001: Retimed Data
000: Raw Data
Other Settings - Invalid
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Table 8. Transmitter Registers (continued)
REGISTER NAME
BITS
OUT1 Invert
FIELD REGISTER
ADDRESS
Reg 0x1F Channel
7
pfd_sel_inv_out1
DEFAULT
R/RW
0x10
Invert OUT1 Polarity
0
RW
6
Reserved
0
RW
5
Reserved
0
RW
4
Reserved
1
RW
3
Reserved
0
RW
2
Reserved
0
RW
1
Reserved
0
RW
0
Reserved
0
RW
OUT0_VOD
Reg 0x80 Channel
0x54
drv_0_sel_vod[3]
0
RW
6
drv_0_sel_vod[2]
1
RW
5
drv_0_sel_vod[1]
0
RW
1
RW
4
3
Reserved
0
RW
2
Reserved
1
RW
mr_drv_0_ov
1
0
OUT1_VOD
sm_drv_0_PD
Reg 0x84 Channel
0
RW
0
RW
1: Power down OUT0
0: OUT1 in normal operating mode
0x04
OUT1 VOD Control
Reserved
0
RW
6
drv_1_sel_vod[2]
0
RW
5
drv_1_sel_vod[1]
0
RW
0
RW
0
RW
drv_1_sel_vod[0]
3
Reserved
drv_1_sel_scp
2
RW
0
RW
1: Enable 0x80[0] to override pin/sm
control
0: Disable 0x80[0] to override pin/sm
control
0
RW
1: Power down OUT1 driver
0: OUT1 in normal operating mode
mr_drv_1_ov
0
OUT1_DE
sm_drv_1_PD
OUTDriver1 VOD Setting
000: 570 mVDifferential(Diff) Peak to
Peak(PP)
010: 730 mV(Diff PP)
100: 900 mV(Diff PP)
110: 1035 mV(Diff PP)
1: Enables short circuit protection on
OUT1
0: Disable short circuit protection on
OUT1
1
1
Controls OUTDriver 0 VOD Setting
0011: Nominal - 10%
0100: Nominal - 5%
0101: Nominal 800 mV
0110: Nominal + 5%
0111: Nominal + 10%
Other Settings - Invalid
1: Enable 0x80[0] to override pin/sm
control
0: Disable 0x80[0] to override pin/sm
control
7
4
1: Inverts OUT1 polarity
0: OUT1 Normal polarity
OUT0 VOD_Scaling_PD
7
drv_0_sel_vod[0]
DESCRIPTION
Reg 0x85
0x00
7
Reserved
0
RW
OUT1 DE Control
6
Reserved
0
RW
5
Reserved
0
RW
4
Reserved
0
RW
3
drv_1_dem_range
0
RW
2
drv_1_dem[2]
0
RW
1
drv_1_dem[1]
0
RW
0
drv_1_dem[0]
0
RW
Controls de-emphasis of 50 Ω Driver
0000: DE Disabled
0001: 0.2 dB
0010: 1.8 dB
0111: 11 dB
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8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LMH1218 is a single channel SDI and 10GbE Cable Driver with Integrated Reclocker that supports different
application spaces. The following sections describe the typical use cases and common implementation practices.
8.1.1 General Guidance for All Applications
The LMH1218 supports two modes of configuration: SPI Mode, and SMBus Mode. Once one of these two control
mechanism is chosen, pay attention to the PCB layout for the high speed signals. SMPTE specifies the
requirements for the Serial Digital Interface to transport digital video at SD, HD, 3Gb/s and higher data rates over
coaxial cables. One of the requirements is meeting the required Return Loss. This requirement specifies how
closely the port resembles 75-Ω impedance across a specified frequency band. The SMPTE specifications also
defines the use of AC coupling capacitors for transporting uncompressed serial data streams with heavy low
frequency content. This specification requires the use of a 4.7µF AC coupling capacitors to avoid low frequency
DC wander. The 75-Ω signal is also required to meet certain rise/fall timing to facilitate highest eye opening for
the receiving device. The LMH1218 built-in 75-Ω termination minimizes parasitic, improving overall signal
integrity. Note: When the FPGA is not transmitting valid SMPTE data, the FPGA output should be muted (P=N).
8.2 Typical Application
VDD
MODE_SEL
0.1 PF
0.01 PF
ENABLE
4.7 PF
11
OUT
FPGA
6
1
IN0+
7
21
4.7 PF
OUT0+ 20
LMH1218
: T-Line
100: Differential T-Line
12
OUT
OUT0- 19
IN0-
4.7 PF
DAP
VSS
VSS
4.7 PF
8
OUT
OUT1+
9
OUT
2
IN+
23
Optical Module
100: Differential T-Line
IN1OUT1-
SS_N
10
IN1+
100: Differential T-Line
FPGA
:
24
3
4
13
15
IN22
16
SCK
MOSI
LOS_INT_N
MISO
LOCK
Figure 23. LMH1218 SPI Mode Configuration
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Typical Application (continued)
The LMH1218 has strong equalization capabilities that allow it to recover data over lossy channel up to 27 dB at
6 GHz. As a result, the optimal placement for the LMH1218 is with the higher loss channel at its input and lower
loss channel segment at the output in order to meet the various SMPTE requirements. To meet SMPTE
requirements, it is strongly recommended to put the LMH1218 as close as possible to the BNC (within 1 inch).
The LMH1218 can be used as a cable driver with integrated reclocker or as reclocker only.
8.2.1 Design Requirements
For the LMH1218 design example, the requirements noted in Table 9 apply.
Table 9. LMH1218 Design Parameters
DESIGN PARAMETER
REQUIREMENT
Input AC coupling capacitors
Required. 4.7 µF AC coupling capacitors are recommended.
Capacitors may be implemented on the PCB or in the connector.
Output AC coupling capacitors
Required. Both OUT0 and OUT1 require AC coupling capacitors.
OUT0 AC Coupling capacitors is expected to be 4.7 µF to comply
with SMPTE wander requirement. It is assumed that Optical Module
has AC coupling capacitors on its input within the module
DC Power Supply Coupling Capacitors
To minimize power supply noise, use 0.01 µF capacitors as close to
the device VDD pins as possible
Distance from Device to BNC
Keep this distance within 1 inch to meet Proposed ST-2081 and ST2082 requirements
High Speed IN0, IN1, OUT0, and OUT1 trace impedance
Design differential trace impedance of IN0, IN1, and OUT1 with 100Ω ± 5%, single-end trace impedance for OUT0 with 75 Ω ± 5%
VDD
MODE_SEL
0.01 PF
0.01 PF
ENABLE
6
11
OUT
100: Differential T-Line
FPGA
1
IN0+
7
21
4.7 PF
OUT0+
LMH1218
20
: T-Line
4.7 PF
12
OUT
OUT0- 19
IN0-
4.7 PF
DAP
VSS
DAP = GND
8
OUT
FPGA
100: Differential T-Line
VSS
OUT
OUT1+
2
IN+
23
Optical Module
100: Differential T-Line
IN1OUT1-
ADDR0
10
IN1+
4.7 PF
9
:
24
15
3
4
13
IN22
16
ADDR1
SCL
SDA
LOS_INT_N
LOCK
Figure 24. LMH1218 SMBus Mode Configuration
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8.2.2 Detailed Design Procedure
To begin the design process, determine the following:
1. Maximum power draw for PCB regulator selection. In this case, use the transient CDR power (during
acquisition) specified in the datasheet, multiplied by the number of channels.
2. Maximum operational power for thermal calculation. For thermal calculation, use the locked power number.
Transient power consumption is only observed during lock acquisition, which typically lasts for <5ms.
Additional margin can be applied in case of unsupported data rates being applied which extend the lock time.
Note that the CDR should operate in bypass mode for any unsupported data rates.
3. Consult the BNC vendor for optimum BNC landing pattern.
4. Use IBIS-AMI model for simple channel simulation before PCB layout.
5. Closely compare schematic against typical connection diagram in the data sheet.
6. Plan out the PCB layout and component placement to minimize parasitic.
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8.2.3 Application Curves
Figure 25 and Figure 27 depict the differential output eye diagrams for OUT1 at 10.3125 Gbps and 11.88 Gbps.
Figure 26 depicts the single-end eye diagram for OUT0 at 11.88 Gbps. Measurements were done at default
operating conditions.
Figure 25. 10.3125 Gbps 50 Ω OUT1
Figure 26. 11.88 Gbps 75 Ω OUT0
Figure 27. 11.88 Gbps 50 Ω OUT1
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8.3 Do's and Don'ts
In order to meet SMPTE standard requirements for jitter, AC timing, and return loss use the following guidelines:
1. Do place BNC within 1 inch of the device.
2. Do consult BNC vendor to provide optimum landing pad for the BNC to comply with the required
specifications.
3. Do pay attention to the recommended solder paste to ensure reliable GND connection to DAP.
4. Do use control impedance for both 100 Ω and 75 Ω for IN0/1 and OUT0/1.
8.4 Initialization Set Up
After power up or register reset write the initialization sequences in Table 10.
Table 10. LMH1218 Register Initialization
DESCRIPTION
ADDRESS [Hex]
VALUE [Hex]
Enable Channel Registers
0xFF
0x04
Enable Full Temperature Range
0x16
0x25
0x3E
0x00
Initialize CDR State Machine Control
0x55
0x02
0x6A
0x00
Restore media CTLE setting (1)
0x03
xx
Reset CDR
0x0A
0x5C
Release Reset
0x0A
0x50
(1)
Refer to LMH1218 Programming Guide (SNLU174) on how to quickly select the most appropriate CTLE boost setting.
8.5 Selective Data Rate Lock
The LMH1218 is configured to automatically lock to all SMPTE data rates. The LMH1218 can be configured to
restrict the dividers to lock to certain data rates. This enables faster lock time. To disable 270 Mbps data rate
lock, additional registers need to be programmed. Refer to LMH1218 Programming Guide (SNLU174) for details.
9 Power Supply Recommendations
Follow these general guidelines when designing the power supply:
1. The power supply should be designed to provide the recommended operating conditions in terms of DC
voltage, AC noise, and start-up ramp time.
2. The maximum current draw for the LMH1218 is provided in the data sheet. This figure can be used to
calculate the maximum current the supply must provide. Current consumption can be derived from the typical
power consumption specification in the data sheet.
3. The LMH1218 does not require any special power supply filtering, provided the recommended operating
conditions are met. Only standard supply decoupling is required.
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10 Layout
10.1 Layout Guidelines
The following guidelines should be followed when designing the layout:
1. Set trace impedances to 75-Ω ± 5% single ended, 100-Ω ± 5% differential.
2. Maintain the same signal reference plane for 75-Ω single-end trace, and reference plane for 100-Ω
differential traces.
3. Use the smallest size surface mount components.
4. Use solid planes. Provide GND or VDD relief under the component pads to minimize parasitic capacitance.
5. Select trace widths that minimize the impedance mismatch along the signal path.
6. Select a board stack-up that supports 75-Ω or 50-Ω single-end trace, 100-Ω coupled differential traces.
7. Use surface mount ceramic capacitors.
8. Place BNC component within 1 inches of the LMH1218 device.
9. Maintain symmetry on the complimentary signals.
10. Route 100-Ω traces uniformly (keep trace widths and trace spacing uniform along the trace).
11. Avoid sharp bends; use 45-degree or radial bends.
12. Walk along the signal path, identify geometry changes and estimate their impedance changes.
13. Maintain 75-Ω impedance with a well-designed connectors’ footprint.
14. Consult a 3-D simulation tool to guide layout decisions.
15. Use the shortest path for VDD and Ground hook-ups; connect pin to planes with vias to minimize or
eliminate trace.
16. When a high speed trace changes layer, provide at least 2 return vias to improve current return path.
10.2 Layout Example
The following example layout demonstrates how the thermal pad should be laid out using standard WQFN board
routing guidelines.
Note: Thermal pad is divided into 4 squares with solder paste
Figure 28. LMH1218 Recommended Four Squares Solder Paste
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Layout Example (continued)
5 Vias without solder paste are located between 4 squares solder paste
Figure 29. LMH1218 Recommended Solder Paste Mask and vias
Top etch plus traces
Figure 30. Example Layout
10.3 Solder Profile
The LMH1218 RTW024A Package solder profile and solder paste material can be found at the following link:
SNOA401
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11 Device and Documentation Support
11.1 Device Support
11.1.1 Development Support
For additional support, see the following:
• TI's E2E community: http://e2e.ti.com/
• High-Speed Interface forum in E2E community: http://e2e.ti.com/support/interface/high_speed_interface/
11.2 Documentation Support
11.2.1 Related Documentation
For related documentation, see the following:
• LMH1218 Programming Guide (SNLU174)
• LMH1218EVM User's Guide (SNLU173)
11.3 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
11.4 Trademarks
E2E is a trademark of Texas Instruments.
11.5 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
11.6 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
LMH1218RTWR
ACTIVE
WQFN
RTW
24
1000
Green (RoHS
& no Sb/Br)
CU SN
Level-3-260C-168 HR
-40 to 85
L1218A1
LMH1218RTWT
ACTIVE
WQFN
RTW
24
250
Green (RoHS
& no Sb/Br)
CU SN
Level-3-260C-168 HR
-40 to 85
L1218A1
(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), Pb-Free (RoHS Exempt), 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.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
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.
(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6)
Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
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.
Addendum-Page 1
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PACKAGE OPTION ADDENDUM
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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 2
PACKAGE MATERIALS INFORMATION
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TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
W
Pin1
(mm) Quadrant
LMH1218RTWR
WQFN
RTW
24
1000
178.0
12.4
4.3
4.3
1.3
8.0
12.0
Q1
LMH1218RTWT
WQFN
RTW
24
250
178.0
12.4
4.3
4.3
1.3
8.0
12.0
Q1
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
6-Aug-2015
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
LMH1218RTWR
WQFN
RTW
24
1000
213.0
191.0
55.0
LMH1218RTWT
WQFN
RTW
24
250
213.0
191.0
55.0
Pack Materials-Page 2
MECHANICAL DATA
RTW0024A
SQA24A (Rev B)
www.ti.com
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