TI1 DS92LX2121 10 - 50 mhz dc-balanced channel link iii bi-directional control serializer and deserializer Datasheet

DS92LX2121, DS92LX2122
www.ti.com
SNLS330J – MAY 2010 – REVISED JANUARY 2014
DS92LX2121/DS92LX2122 10 - 50 MHz DC-Balanced Channel Link III Bi-Directional Control
Serializer and Deserializer
Check for Samples: DS92LX2121, DS92LX2122
FEATURES
APPLICATIONS
•
•
•
1
2
•
General
– Up to 1050 Mbits/sec Data Throughput
– 10 MHz to 50 MHz Input Clock Support
– Supports 18-bit Color Depth (RGB666 + HS,
VS, DE)
– Embedded Clock with DC Balanced Coding
to Support AC-Coupled Interconnects
– Capable to Drive up to 10 Meters Shielded
Twisted-Pair
– Bi-Directional Control Interface Channel
with I2C Support
– I2C Interface for Device Configuration.
Single-Pin ID Addressing
– Up to 4 GPI on DES and GPO on SER
– AT-SPEED BIST Diagnosis Feature to
Validate Link Integrity
– Individual Power-Down Controls for both
SER and DES
– User-Selectable Clock Edge for Parallel
Data on both SER and DES
– Integrated Termination Resistors
– 1.8V- or 3.3V-Compatible Parallel Bus
Interface
– Single Power Supply at 1.8V
– IEC 61000–4–2 ESD Compliant
– Temperature Range −40°C to +85°C
DESERIALIZER — DS92LX2122
– No Reference Clock Required on
Deserializer
– Programmable Receive Equalization
– LOCK Output Reporting Pin to Ensure
– EMI/EMC Mitigation
– Programmable Spread Spectrum (SSCG)
Outputs
– Receiver Output Drive Strength Control
(RDS)
– Receiver Staggered Outputs
Industrial Displays, Touch Screens
Medical Imaging
DESCRIPTION
The DS92LX2121/DS92LX2122 chipset offers a
Channel Link III interface with a high-speed forward
channel and a full-duplex control channel for data
transmission over a single differential pair. The
DS92LX2121/DS92LX2122 incorporates differential
signaling on both the high-speed and bi-directional
back channel control data paths. The Serializer/
Deserializer pair is targeted for direct connections
between graphics host controller and displays
modules. This chipset is ideally suited for driving
video data to displays requiring 18-bit color depth
(RGB666 + HS, VS, and DE) along with a bidirectional back channel control bus. The primary
transport converts 21 bit data over a single highspeed serial stream, along with a separate low
latency bi-directional back channel transport that
accepts control information from an I2C port. Using
TI’s embedded clock technology allows transparent
full-duplex communication over a single differential
pair, carrying asymmetrical bi-directional back
channel control information in both directions. This
single serial stream simplifies transferring a wide data
bus over PCB traces and cable by eliminating the
skew problems between parallel data and clock
paths. This significantly saves system cost by
narrowing data paths that in turn reduce cable width,
connector size and pins.
In addition, the Deserializer provides input
equalization to compensate for loss from the media
over longer distances. Internal DC balanced
encoding/decoding is used to support AC-Coupled
interconnects.
A sleep function provides a power-savings mode
when the high speed forward channel and embedded
bi-directional control channel are not needed.
The Serializer is offered in a 40-pin lead in WQFN
and Deserializer is offered in a 48-pin WQFN
packages.
1
2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010–2014, Texas Instruments Incorporated
DS92LX2121, DS92LX2122
SNLS330J – MAY 2010 – REVISED JANUARY 2014
www.ti.com
Typical Application Diagram
Channel Link III
Parallel
Data In
18+3
Graphics
Controller,
Camera
Parallel
Data Out
18+3
4
Display
Module, Frame
Grabber
4
DS92LX2121
DS92LX2122
GPO
GPI
Back Channel
2
Serial
Control Bus
2
Serializer
Deserializer
Serial
Control Bus
DOUT+
DOUT-
RIN+ RT
RT
Output Latch
RT
Decoder
Serializer
4
RT
Deserializer
GPO[3:0]
Encoder
Data [17:0], 21
Control [2:0]
Input Latch
Block Diagrams
21 Data [17:0],
Control [2:0]
4
GPI[3:0]
RINPCLK
PDB
BISTEN
M/S
LOCK
PASS
I2C Controller
Encoder
FIFO
Encoder
Decoder
Timing
and
Control
Decoder
CAD
I2C Controller
SCL
Clock
Gen
CDR
Timing
and
Control
PDB
M/S
SDA
Clock
Gen
PLL
FIFO
PCLK
SDA
SCL
CAD
DS92LX2122 - DESERIALIZER
DS92LX2121 - SERIALIZER
Figure 1. Block Diagram
DS92LX2121
Serializer
Graphics
Controller
--Video
Processor
-Camera
Channel Link III
R[5:0]
G[5:0]
B[5:0]
VS
HS
DE
PCLK
PDB
M/S
DS92LX2122
Deserializer
R[5:0]
G[5:0]
B[5:0]
VS
HS
DE
PCLK
PLL
Config.
Config.
PDB
M/S
BISTEN
GPI[3:0]
Timing
Controller
-Display
-Frame Grabber
GPO[3:0]
PC
SDA
SCL
2
I C
2
I C
SDA
SCL
PC
Figure 2. Application Block Diagram
2
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SNLS330J – MAY 2010 – REVISED JANUARY 2014
DS92LX2121 Pin Diagram
DIN[7]
DIN[6]
DIN[5]
DIN[4]
DIN[3]
DIN[2]
DIN[1]
DIN[0]
GPO[3]
GPO[2]
30
29
28
27
26
25
24
23
22
21
Top View
20
GPO[1]
19
GPO[0]
33
18
VDDCML
VDDD
34
17
DOUT+
DIN[10]
35
16
DOUT-
DIN[11]
36
15
VDDT
DIN[12]
37
14
VDDPLL
DIN[13]
38
13
PDB
DIN[14]
39
12
M/S
DIN[15]
40
11
RES
3
4
5
6
7
8
9
10
DIN[19]
DIN[20]
PCLK
SCL
SDA
CAD
RES
DS92LX2121
(Top View)
DIN[18]
DIN[9]
DAP = GND
2
32
DIN[17]
DIN[8]
1
31
DIN[16]
VDDIO
Figure 3. Serializer - DS92LX2121
40-Pin WQFN (RTA Package)
DS92LX2121 Serializer PIN DESCRIPTIONS
Pin Name
Pin No.
I/O, Type
Description
LVCMOS PARALLEL INTERFACE
DIN[20:0]
PCLK
5, 4, 3, 2, 1, 40,
39, 38, 37, 36,
35, 33, 32, 30,
29, 28, 27, 26,
25, 24, 23
Inputs, LVCMOS w/
pull down
Parallel data inputs.
6
Input, LVCMOS w/
pull down
Pixel Clock Input Pin. Strobe edge set by TRFB configuration.
GENERAL PURPOSE OUTPUT (GPO)
GPO[3:0]
22, 21, 20, 19
Output, LVCMOS
General-purpose pins individually configured as outputs; which are used to
control and respond to various commands.
SERIAL CONTROL BUS - I2C COMPATIBLE
SCL
7
Input/Output, Open
Drain
Clock line for the serial control bus communication
SCL requires an external pull-up resistor to VDDIO.
SDA
8
Input/Output, Open
Drain
Data line for the serial control bus communication
SDA requires an external pull-up resistor to VDDIO.
Input, LVCMOS w/
pull down
I2C Mode Select
M/S = L, Master mode (default); device generates and drives the SCL clock
line. Device is connected to a slave peripheral on the bus. (Serializer initially
starts up in Standby mode and is enabled through remote wakeup by the
Deserializer)
M/S = H, Slave; device accepts SCL clock input
M/S
CAD
12
9
Input, analog
Continuous Address Decoder
Input pin to select the Slave Device Address.
Input is connect to external resistor divider to programmable Device ID
address (see Serial Control Bus Connection).
Copyright © 2010–2014, Texas Instruments Incorporated
Product Folder Links: DS92LX2121 DS92LX2122
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DS92LX2121, DS92LX2122
SNLS330J – MAY 2010 – REVISED JANUARY 2014
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DS92LX2121 Serializer PIN DESCRIPTIONS (continued)
Pin Name
Pin No.
I/O, Type
Description
CONTROL AND CONFIGURATION
PDB
13
Input, LVCMOS w/
pull down
Power down Mode Input Pin.
PDB = H, Transmitter is enabled and is ON.
PDB = L, Transmitter is in Sleep (Power Down). When the transmitter is in the
SLEEP state, the PLL is shutdown, and IDD is minimized.
RES
10, 11
Input, LVCMOS w/
pull down
Reserved. This pin MUST be tied LOW.
Channel Link III INTERFACE
DOUT+
17
Input/Output, CML
Non-inverting differential output, back-channel input.
DOUT-
16
Input/Output, CML
Inverting differential output, back-channel input.
VDDPLL
14
Power, Analog
PLL Power, 1.8V ±5%
VDDT
15
Power, Analog
Tx Analog Power, 1.8V ±5%
VDDCML
18
Power, Analog
LVDS & BC Dr Power, 1.8V ±5%
VDDD
34
Power, Digital
Digital Power, 1.8V ±5%
VDDIO
31
Power, Digital
Power for input stage, The single-ended inputs are powered from VDDIO.
DAP
Ground, DAP
DAP must be grounded. Connect to the ground plane (GND) with at least 16
vias.
Power and Ground
VSS
DS92LX2122 Pin Diagram
ROUT[0]
ROUT[1]
ROUT[2]
ROUT[3]
27
26
25
GPI[2]
31
28
GPI[1]
32
GPI[3]
GPI[0]
33
VDDOR1
LOCK
34
29
PDB
35
30
VDDR
36
Top View
24
ROUT[4]
23
ROUT[5]
PASS
37
RES
38
RES
39
22
ROUT[6]
VDDCML
40
21
ROUT[7]
RIN+
41
20
VDDOR2
19
ROUT[8]
18
ROUT[9]
DAP = GND
RIN-
42
RES
43
BISTEN
44
17
VDDD
VDDPLL
45
16
ROUT[10]
RES
46
15
ROUT[11]
M/S
47
14
ROUT[12]
CAD
48
13
ROUT[13]
9
10
11
12
ROUT[16]
ROUT[15]
ROUT[14]
8
ROUT[17]
7
6
ROUT[19]
VDDOR3
5
ROUT[18]
4
PCLK
3
ROUT[20]
2
SCL
VDDSSCG
SDA
1
DS92LX2122
(Top View)
Figure 4. Deserializer - DS92LX2122
48-Pin WQFN (RHS Package)
4
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SNLS330J – MAY 2010 – REVISED JANUARY 2014
DS92LX2122 Deserializer PIN DESCRIPTIONS
Pin Name
Pin No.
I/O, Type
Description
LVCMOS PARALLEL INTERFACE
ROUT[20:0]
PCLK
5, 6, 8, 9, 10,
11, 12, 13, 14,
15, 16, 18, 19,
21, 22, 23, 24,
25, 26, 27, 28
Outputs, LVCMOS
Parallel data outputs.
4
Output, LVCMOS
Pixel Clock Output Pin.
Strobe edge set by RFB configuration. In SLEEP, outputs are controlled by the
OSS_SEL.
General Purpose Input (GPI)
GPI[3:0]
30, 31, 32, 33
Input, Digital
General-purpose pins individually configured as inputs; which are used to
control and respond to various commands.
SERIAL CONTROL BUS - I2C COMPATIBLE
SCL
2
Input/Output, Open
Drain
Clock line for the serial control bus communication
SCL requires an external pull-up resistor to VDDIO.
SDA
1
Input/Output, Open
Drain
Data line for serial control bus communication
SDA requires an external pull-up resistor to VDDIO.
I2C Mode Select
M/S
47
Input, LVCMOS w/
pull up
M/S = L, Master; device generates and drives the SCL clock line. Device is
connected to slave peripheral on teh bus.
M/S = H, Slave (default); device accepts SCL clock input and is attached to an
I2C controller master on the bus. Slave mode does not generate the SCL clock,
but uses the clock generated by teh Master for teh data transfer.
Continuous Address Decoder
CAD
48
Input, analog
Input pin to select the Slave Device Address.
Input is connect to external resistor divider to programmable Device ID address
(see Serial Control Bus Connection)
CONTROL AND CONFIGURATION
Power down Mode Input Pin.
PDB
35
Input, LVCMOS w/
pull down
PDB = H, Receiver is enabled and is ON.
PDB = L, Receiver is in Sleep (Power down mode). When the Receiver is in the
SLEEP state, the LVCMOS Outputs are in TRI-STATE, the PLL is shutdown
and IDD is minimized.
LOCK Status Output Pin.
LOCK
34
Output, LVCMOS
LOCK = H, PLL is Locked, outputs are active
LOCK = L, PLL is unlocked, ROUT and PCLK output states are controlled by
OSS_SEL. May be used as Link Status.
Reserved.
RES
38, 39, 43, 46
-
Pin 43: Leave pin open.
Pin 46: This pin MUST be tied LOW.
Pins 38, 39: Route to test point as differential pair or leave open if unused.
BIST MODE
BIST Enable Pin.
BISTEN
44
Input, LVCMOS w/
pull down
BISTEN = H, BIST Mode is enabled.
BISTEN = L, BIST Mode is disabled.
PASS Output Pin for BIST mode.
PASS
37
Output, LVCMOS
PASS = H, ERROR FREE Transmission
PASS = L, one or more errors were detected in the received payload.
Leave Open if unused. Route to test point (pad) recommended.
Channel Link III INTERFACE
RIN+
41
Input/Output, CML
Non-inverting differential input, back channel output. The interconnect must be
AC coupled with a 0.1μF capacitor.
RIN-
42
Input/Output, CML
Inverting differential input, back channel output. The interconnect must be AC
coupled with a 0.1 μF capacitor.
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Product Folder Links: DS92LX2121 DS92LX2122
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DS92LX2121, DS92LX2122
SNLS330J – MAY 2010 – REVISED JANUARY 2014
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DS92LX2122 Deserializer PIN DESCRIPTIONS (continued)
Pin Name
Pin No.
I/O, Type
Description
POWER AND GROUND
3
Digital Power
SSCG Power, 1.8V ±5%
Power supply must be connect regardless if SSCG function is in operation
29, 20, 7
Digital Power
TTL Output Buffer Power, The single-ended outputs and control input are
powered from VDDIO. VDDIO can be connected to a 1.8V ±5% or 3.3V ±10%
VDDSSCG
VDDOR1/2/3
VDDD
17
Digital Power
Digital Core Power, 1.8V ±5%
VDDR
36
Analog Power
Rx Analog Power, 1.8V ±5%
VDDCML
40
Analog Power
Bi-directional Channel Driver Power, 1.8V ±5%
VDDPLL
45
Analog Power
PLL Power, 1.8V ±5%
DAP
Ground, DAP
DAP must be grounded. Connect to the ground plane (GND) with at least 16
vias.
VSS
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.
Absolute Maximum Ratings (1) (2)
Supply Voltage ( VDD1V8)
−0.3V to +2.5V
Supply Voltage (VDD3V3)
−0.3V to +4.0V
LVCMOS Input Voltage (VDD1V8)
−0.3V to +(VDD1V8 + 0.3V)
LVCMOS Input Voltage (VDD3V3)
−0.3V to +(VDD3V3 + 0.3V)
−0.3V to +(VDD + 0.3V)
LVCMOS Output Voltage (VDD)
CML Receiver Input Voltage (VDD1V8)
−0.3V to (VDD1V8 + 0.3V)
CML Driver Output Voltage (VDD1V8)
−0.3V to (VDD1V8 + 0.3V)
Junction Temperature
+150°C
Storage Temperature
−65°C to +150°C
Maximum Package Power Dissipation Capacity
1/θJA °C/W above +25°
Package Derating:
DS92LX2121 40L WQFN
θJA(based on 16 thermal vias)
30.7 °C/W
θJC(based on 16 thermal vias)
6.8 °C/W
DS92LX2122 48L WQFN
θJA(based on 16 thermal vias)
26.9 °C/W
θJC(based on 16 thermal vias)
4.4 °C/W
ESD Rating (IEC61000–4–2)
RD = 330Ω, CS = 150 pF
Air Discharge (DOUT+, DOUT-, RIN+, RIN-)
≥±25 kV
Contact Discharge (DOUT+, DOUT-, RIN+, RIN-)
≥±10 kV
≥±8 kV
ESD Rating (HBM)
For soldering specifications, see the Absolute Maximum Ratings for Soldering Application Report (literature number SNOA549).
(1)
(2)
“Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of
device reliability and/or 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; the device should not be operated beyond such conditions.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
Recommended Operating Conditions
Min
Nom
Max
Units
VDD (1.8V)
1.71
1.8
1.89
V
VDDIO (1.8V Mode)
1.71
1.8
1.89
V
VDDIO (3.3V Mode)
3
3.3
3.6
V
6
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SNLS330J – MAY 2010 – REVISED JANUARY 2014
Recommended Operating Conditions (continued)
Min
Nom
Max
Units
VDDn (1.8 V)
25
mVP-P
VDDIO (1.8 V)
25
mVP-P
50
mVP-P
Supply Noise (1)
VDDIO (3.3 V)
Operating Free Air
Temperature (TA)
-40
Input Clock Rate
(1)
25
10
85
°C
50
MHz
Supply noise testing was done with minimum capacitors (as shown on Figures 35, 36) on the PCB. A sinusoidal signal is AC coupled to
the VDDn (1.8V) supply with amplitude = 25 mVp-p measured at the device VDDn pins. Bit error rate testing of input to the Ser and output
of the Des with 10 meter cable shows no error when the noise frequency on the Ser is less than 1 MHz. The Des on the other hand
shows no error when the noise frequency is less than 750 kHz.
Serializer Electrical Characteristics (1) (2) (3)
Over recommended operating supply and temperature ranges unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
LVCMOS DC SPECIFICATIONS 3.3V I/O (TX INPUTS, RX OUTPUTS, GPIO, CONTROL INPUTS AND OUTPUTS)
VIH
High Level Input Voltage
VIN = 3.0V to 3.6V
2.0
VIN
V
VIL
Low Level Input Voltage
VIN = 3.0V to 3.6V
GND
0.8
V
IIN
Input Current
VIN = 0V or 3.6V
VIN = 3.0V to 3.6V
-20
+20
µA
VOH
High Level Output Voltage
VDDIO = 3.0V to
3.6V
2.4
VDDIO
VOL
Low Level Output Voltage
VDDIO = 3.0V to
3.6V
IOH = +4mA
GND
0.4
IOS
IOZ
Output Short Circuit Current
VOUT = 0V
RPWDNB = 0V,
VOUT = 0V or VDD
TRI-STATE Output Current
±1
V
V
Serializer
GPO Outputs
-24
Deserializer
LVCMOS
Outputs
-39
mA
Register
Address
(OSS_SEL =
0)
-20
±1
+20
µA
LVCMOS DC SPECIFICATIONS 1.8V I/O (TX INPUTS, RX OUTPUTS, GPIO, CONTROL INPUTS AND OUTPUTS)
VIH
High Level Input Voltage
VIN = 1.71V to
1.89V
0.65 VIN
VIN + 0.3
VIL
Low Level Input Voltage
VIN = 1.71V to
1.89V
GND
0.35 VIN
IIN
Input Current
VIN = 0V or 1.89V
VIN = 1.71V to
1.89V
-20
VOH
High Level Output Voltage
VDDIO = 1.71V to
1.89V
IOH = −4mA
VOL
Low Level Output Voltage
VDDIO = 1.71V to
1.89V
IOL = +4 mA
(1)
(2)
(3)
V
±1
+20
µA
VDDIO - 0.45
VDDIO
V
GND
0.45
V
The Electrical Characteristics tables list ensured specifications under the listed Recommended Operating Conditions except as
otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and
are not guaranteed.
Current into device pins is defined as positive. Current out of a device pin is defined as negative. Voltages are referenced to ground
except VOD, ΔVOD, VTH and VTL which are differential voltages.
Typical values represent most likely parametric norms at 1.8V or 3.3V, TA = +25°C, and at the Recommended Operation Conditions at
the time of product characterization and are not guaranteed.
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Serializer Electrical Characteristics(1)(2)(3) (continued)
Over recommended operating supply and temperature ranges unless otherwise specified.
Symbol
IOS
Parameter
Conditions
Output Short Circuit Current
IOZ
VOUT = 0V
(4)
RPWDNB = 0V,
VOUT = 0V or VDD
TRI-STATE Output Current
Min
Typ
Serializer
GPO Outputs
-11
Deserializer
LVCMOS
Outputs
-20
Max
Units
mA
Register
Address
(OSS_SEL =
0)
-20
±1
+20
µA
268
340
412
mV
1
50
mV
VDD (MIN) - VOD
VDD - VOD
VDD (MAX) VOD (MIN)
V
1
50
mV
CML DRIVER DC SPECIFICATIONS (DOUT+, DOUT-)
RT = 100Ω
(SeeFigure 9)
|VOD|
Output Differential Voltage
ΔVOD
Output Differential Voltage Unbalance RL = 100Ω
RL = 100Ω (See
Figure 9)
VOS
Output Differential Offset Voltage
ΔVOS
Offset Voltage Unbalance
RL = 100Ω
IOS
Output Short Circuit Current
DOUT+/- = 0V,
PDB = L or H (4)
RT
Differential Internal Termination
Resistance
Differential across
DOUT+ and
DOUT-
(MAX)
-27
80
100
mA
120
Ω
CML RECEIVER DC SPECIFICATIONS (RIN+, RIN-)
VTH
Differential Threshold High Voltage
VTL
Differential Threshold Low Voltage
+90
VIN
Differential Input Voltage Range
RIN+ - RIN-
180
IIN
Input Current
VIN = VDD or 0 V,
VDD = 1.89 V
-20
±1
+20
µA
RT
Differential Internal Termination
Resistance
Differential across
RIN+ and RIN-
80
100
120
Ω
62
90
VCM = 1.2V
-90
mV
mV
SER/DES SUPPLY CURRENT *DIGITAL, PLL,
AND ANALOG VDDS
Serializer (Tx)
Total Supply Current Mode (includes
load current)
IDDT
IDDIOT
RT = 100Ω
WORST CASE
pattern (See
Figure 6)
RT = 100Ω
RANDOM pattern
RT = 100Ω
Serializer (Tx)
WORST CASE
VDDIO Supply Current (includes load
pattern (See
current)
Figure 6)
IDDTZ
IDDIOTZ
(4)
8
Serializer (Tx)
Supply Current Power-down
PDB = 0V; All
other LVCMOS
Inputs = 0V
VDDn = 1.89
V
f = 50 MHz
Default
Registers
mA
55
VDDIO = 1.89
V
PCLK = 50
MHz
Default
Registers
2
VDDIO = 3.6 V
PCLK = 50
MHz
Default
Registers
7
15
VDD = 1.89 V
370
775
VDDIO = 1.89
V
55
125
VDDIO = 3.6 V
65
135
5
mA
µA
Specification is ensured by characterization and is not tested in production.
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SNLS330J – MAY 2010 – REVISED JANUARY 2014
Serializer Electrical Characteristics(1)(2)(3) (continued)
Over recommended operating supply and temperature ranges unless otherwise specified.
Symbol
Parameter
Conditions
Deserializer (Rx)
VDDn Supply Current (includes load
current)
IDDR
IDDIOR
IDDRZ
Typ
Max
96
VDDn = 1.89V
CL = 8pF
WORST CASE
Pattern
(See Figure 6)
PCLK = 50
MHz
SSCG[3:0] =
ON
Default
Registers
60
VDDn = 1.89V
CL = 8pF
RANDOM Pattern
PCLK = 50
MHz
Default
Registers
53
VDDIO = 1.89 V
CL = 8pF
WORST CASE
Pattern
(See Figure 6)
PCLK = 50
MHz
Default
Registers
Deserializer (Rx)
VDDIO Supply Current (includes load
VDDIO = 3.6 V
current)
CL = 8pF
WORST CASE
Pattern
(See Figure 6)
PDB = 0V; All
other LVCMOS
Inputs = 0V
Deserializer (Rx)
Supply Current Power-down
Min
IDDIORZ
Units
mA
21
32
mA
PCLK = 50
MHz
Default
Registers
49
83
VDDn = 1.89
V
42
400
VDDIO = 1.89
V
8
40
VDDIO = 3.6 V
350
800
µA
Serializer Electrical Characteristics Recommended Serializer Timing for PCLK (1) (2) (3)
Over recommended operating supply and temperature ranges unless otherwise specified.
Symbol
Parameter
tTCP
Transmit Clock Period
tTCIH
Transmit Clock Input High
Time
Conditions
10 MHz – 50 MHz
Transmit Clock Input Low
Time
tCLKT
PCLK Input Transition Time
tOSC
Internal oscillator clock
source
(2)
(3)
(4)
Typ
Max
Units
20
T
100
ns
0.4T
0.5T
0.6T
ns
0.4T
0.5T
0.6T
ns
3
ns
(4)
tTCIL
(1)
Min
0.5
25
MHz
The Electrical Characteristics tables list ensured specifications under the listed Recommended Operating Conditions except as
otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and
are not guaranteed.
Current into device pins is defined as positive. Current out of a device pin is defined as negative. Voltages are referenced to ground
except VOD, ΔVOD, VTH and VTL which are differential voltages.
Typical values represent most likely parametric norms at 1.8V or 3.3V, TA = +25°C, and at the Recommended Operation Conditions at
the time of product characterization and are not guaranteed.
Specification is ensured by characterization and is not tested in production.
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Serializer Electrical Characteristics Serializer Switching Characteristics (1) (2) (3)
Symbol
Typ
Max
Units
tLHT
CML Low-to-High Transition
Time
RL = 100Ω (Figure 7)
150
330
ps
tHLT
CML High-to-Low Transition
Time
RL = 100Ω
(Figure 7)
150
330
ps
tDIS
Data Input Setup to PCLK
tDIH
Data Input Hold from PCLK
tPLD
Serializer PLL Lock Time
RL = 100Ω
tSD
Serializer Delay
RT = 100Ω
f = 10-50 MHz
Reg Address 0x03h b[0] (TRFB = 1)
(Figure 15)
tJIND
Serializer Output
Deterministic Jitter
Serializer output intrinsic deterministic
jitter . Measured (cycle-cycle) with
PRBS-7 test pattern PCLK = 50 MHz
0.13
UI
tJINR
Serializer Output Random
Jitter
Serializer output intrinsic random jitter
(cycle-cycle). Alternating-1,0 pattern.
PCLK = 50 MHz
0.04
UI
tJINT
Peak-to-peak Serializer
Output Jitter
Serializer output peak-to-peak jitter
includes deterministic jitter, random
jitter, and jitter transfer from serializer
input. Measured (cycle-cycle) with
PRBS-7 test pattern.
PCLK = 50MHz
0.396
UI
λSTXBW
Serializer Jitter Transfer
Function -3 dB Bandwidth
PCLK = 50 MHz Default Registers
1.90
MHz
δSTX
Serializer Jitter Transfer
Function (Peaking
PCLK = 50 MHz Default Registers
0.944
dB
δSTXf
Serializer Jitter Transfer
Function (Peaking
Frequency)
PCLK = 50 MHz Default Registers
500
kHz
(1)
(2)
(3)
Parameter
Conditions
Min
Serializer Data Inputs (Figure 13)
2.0
ns
2.0
ns
6.386T + 5
1
2
ms
6.386T +
12
6.386T +
19.7
ns
The Electrical Characteristics tables list ensured specifications under the listed Recommended Operating Conditions except as
otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and
are not guaranteed.
Current into device pins is defined as positive. Current out of a device pin is defined as negative. Voltages are referenced to ground
except VOD, ΔVOD, VTH and VTL which are differential voltages.
Typical values represent most likely parametric norms at 1.8V or 3.3V, TA = +25°C, and at the Recommended Operation Conditions at
the time of product characterization and are not guaranteed.
Serializer Electrical Characteristics Deserializer Switching Characteristics (1) (2) (3)
Over recommended operating supply and temperature ranges unless otherwise specified.
Symbol
Parameter
tRCP
Receiver Output Clock Period
tPDC
PCLK Duty Cycle
tCLH
LVCMOS Low-to-High Transition
Time
tCHL
(1)
(2)
(3)
(4)
10
LVCMOS High-to-Low Transition
Time
Conditions
tRCP = tTCP
VDDIO: 1.71 V to 1.89 V
or 3.0 V to 3.6 V,
CL = 8pF (lumped load)
Default Registers
(Figure 16 ) (4)
Min
Typ
Max
Units
PCLK
Pin/Freq.
20
T
100
ns
PCLK
45
50
55
%
1.3
2.0
2.8
1.3
2.0
2.8
Deserializer PCLK
Output
ns
The Electrical Characteristics tables list ensured specifications under the listed Recommended Operating Conditions except as
otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and
are not guaranteed.
Current into device pins is defined as positive. Current out of a device pin is defined as negative. Voltages are referenced to ground
except VOD, ΔVOD, VTH and VTL which are differential voltages.
Typical values represent most likely parametric norms at 1.8V or 3.3V, TA = +25°C, and at the Recommended Operation Conditions at
the time of product characterization and are not guaranteed.
Specification is ensured by design and is not tested in production.
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DS92LX2121, DS92LX2122
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SNLS330J – MAY 2010 – REVISED JANUARY 2014
Serializer Electrical Characteristics Deserializer Switching Characteristics(1)(2)(3) (continued)
Over recommended operating supply and temperature ranges unless otherwise specified.
Symbol
Parameter
LVCMOS Low-to-High Transition
Time
tCLH
tCHL
LVCMOS High-to-Low Transition
Time
tROS
ROUT Setup Data to PCLK
tROH
ROUT Hold Data to PCLK
tDD
Deserializer Delay
tDDLT
Deserializer Data Lock Time
tRJIT
Receiver Input Jitter Tolerance
tDCJ
Deserializer Clock Jitter
tDPJ
Deserializer Period Jitter
tDCCJ
Deserializer Cycle-to-Cycle Clock
Jitter
fDEV
Spread Spectrum Clocking
Deviation Frequency
fMOD
Spread Spectrum Clocking
Modulation Frequency
(5)
(6)
(7)
(8)
(9)
(10)
(11)
Conditions
Pin/Freq.
VDDIO: 1.71 V to 1.89 V
or 3.0 V to 3.6 V,
CL = 8pF (lumped load)
Default Registers
(Figure 17) (4)
Deserializer Data
Outputs
VDDIO: 1.71 V to 1.89 V
or 3.0 V to 3.6 V, CL =
8pF (lumped load)
Default Registers
Deserializer Data
Outputs
Default Registers
Register 0x03h b[0]
(RRFB = 1)
Figure 18
10 MHz - 50 MHz
(5)
Min
Typ
Max
1.6
2.4
3.3
1.6
2.4
3.3
0.38
0.5
0.38T
0.5T
4.571T +
8
4.571T +
12
Units
ns
10 MHz - 50 MHz
T
4.571T
+ 16
ns
10
ms
(6) (7)
0.53
PCLK
SSCG[3:0] = OFF
10 MHz
300
550
50 MHz
120
250
PCLK
SSCG[3:0] = OFF
10 MHz
425
600
(10) (9)
50 MHz
320
480
PCLK
SSCG[3:0] = OFF
10 MHz
320
500
(11) (9)
50 MHz
300
500
LVCMOS Output Bus
SSC[3:0] = ON
Figure 20
20 MHz - 50 MHz
±0.5% to
±2.0%
%
20 MHz - 50 MHz
9 kHz to
66 kHz
kHz
50 MHz
(8) (9)
UI
ps
ps
ps
tPLD and tDDLT is the time required by the serializer and deserializer to obtain lock when exiting power-down state with an active PCLK.
UI – Unit Interval is equivalent to one ideal serialized data bit width. The UI scales with PCLK frequency.
tRJIT max (0.61UI) is limited by instrumentation and actual tRJIT of in-band jitter at low frequency (<2 MHz) is greater 1 UI.
tDCJ is the maximum amount of jitter measured over 30,000 samples based on Time Interval Error (TIE).
Specification is ensured by characterization and is not tested in production.
tDPJ is the maximum amount the period is allowed to deviate measured over 30,000 samples.
tDCCJ is the maximum amount of jitter between adjacent clock cycles measured over 30,000 samples.
Bi-Directional Control Bus AC Timing Specifications (SCL, SDA) - I2C Compliant (Figure 5)
Over recommended operating supply and temperature ranges unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
100
kHz
RECOMMENDED INPUT TIMING REQUIREMENTS (1)
fSCL
SCL Clock Frequency
fLOW
SCL Low Period
4.7
µs
fHIGH
SCL High Period
4.0
µs
tHD:STA
Hold time for a start or a repeated start
condition
4.0
µs
tSU:STA
Set Up time for a start or a repeated
start condition
4.7
µs
tHD:DAT
Data Hold Time
tSU:DAT
Data Set Up Time
250
ns
tSU:STO
Set Up Time for STOP Condition,
4.0
µs
tr
SCL & SDA Rise Time
1000
tf
SCL & SDA Fall Time
300
ns
Cb
Capacitive load for bus
400
pF
(1)
fSCL = 100 kHz
>0
0
3.45
µs
ns
Recommended Input Timing Requirements are input specifications and not tested in production.
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Bi-Directional Control Bus AC Timing Specifications (SCL, SDA) - I2C Compliant
(Figure 5) (continued)
Over recommended operating supply and temperature ranges unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
SWITCHING CHARACTERISTICS ()
fSCL
SCL Clock Frequency
tLOW
Serializer MODE = 0 – R/W Register
0x05 = 0x40'h
100
Deserializer MODE = 0 – READ
Register 0x06 b[6:4] = 0x00'h
100
kHz
Serializer MODE = 0 – R/W Register
0x05 = 0x40'h
SCL Low Period
Deserializer MODE = 0 – READ
Register 0x06 b[6:4] = 0x00'h
Serializer MODE = 0 – R/W Register
0x05 = 0x40'h
4.7
μs
4.0
μs
tHIGH
SCL High Period
tHD:STA
Hold time for a start or a repeated start
condition
Serializer MODE = 0 Register 0x05
= 0x40'h
4.0
μs
tSU:STA
Set Up time for a start or a repeated
start condition
Serializer MODE = 0 Register 0x05
= 0x40'h
4.7
μs
tHD:DAT
Data Hold Time
tSU:DAT
Data Set Up Time
tSU:STO
Set Up Time for STOP Condition
tf
SCL & SDA Fall Time
tBUF
Bus free time between a stop and start
condition
tTIMEOUT
NACK Time out
Deserializer MODE = 0 – READ
Register 0x06 b[6:4] = 0x00'h
0
3.45
Serializer M/S = 0
μs
4.0
300
Serializer M/S = 0
μs
μs
250
4.7
μs
µs
Serializer
1
Deserializer
25
ms
SDA
tLOW
tf
tHD;STA
tr
tf
tBUF
tr
tSP
SCL
tSU;STA
tHD;STA
tHIGH
tSU;STO
tSU;DAT
tHD;DAT
START
STOP
REPEATED
START
START
Figure 5. Serial Control Bus Timing
Bi-Directional Control Bus DC Characteristics (SCL, SDA) - I2C Compliant
Symbol
Parameter
Conditions
Min
Typ
Max
Units
VDDIO
V
0.3 x
VDDIO
V
VIH
Input High Level
SDA and SCL
0.7 x
VDDIO
VIL
Input Low Level Voltage
SDA and SCL
GND
VHY
Input Hysteresis
IOZ
TRI-STATE Output Current
PDB = 0V VOUT = 0V or VDD
-20
±1
+20
µA
IIN
Input Current
SDA or SCL, Vin = VDDIO or GND
-20
±1
+20
µA
CIN
Input Pin Capacitance
12
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>50
<5
mV
pF
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SNLS330J – MAY 2010 – REVISED JANUARY 2014
Bi-Directional Control Bus DC Characteristics (SCL, SDA) - I2C Compliant (continued)
Symbol
VOL
Parameter
Conditions
Low Level Output Voltage
Max
Units
SCL and SDA VDDIO = 3.0V IOL = 1.5
mA
Min
Typ
0.36
V
SCL and SDA VDDIO = 1.71V IOL = 1
mA
0.36
V
AC Timing Diagrams and Test Circuits
Device Pin Name
Signal Pattern
T
PCLK
ODD DIN/ROUT
EVEN DIN/ROUT
Figure 6. “Worst Case” Test Pattern
80%
Vdiff
80%
20%
Vdiff = 0V
20%
tLHT
tHLT
Vdiff = (DOUT+) - (DOUT-)
Figure 7. Serializer CML Output Load and Transition Times
DOUT+
100 nF
50:
ZDiff = 100:
SCOPE
BW 8 4.0 GHz
100:
50:
DOUT-
100 nF
16
DIN/HS/VS
PARALLEL-TO-SERIAL
Figure 8. Serializer CML Output Load and Transition Times
DOUT+
RL
DOUT-
PCLK
Figure 9. Serializer VOD DC Diagram
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DOUT-
Single Ended
V
V
OD
V
OD+
ODV
DOUT+
|
OS
0V
Differential
V
OD+
0V
(DOUT+)-(DOUT-)
V
OD-
Figure 10. Serializer VOD DC Diagram
RIN+
VCM = 1.2V
RIN+
VT H
VID
VTL
VIN
VID
VIN
RIN-
RIN-
GND
Figure 11. Low-Voltage Differential VTH/VTL Definition Diagram
80%
VDD
80%
PCLK
20%
20%
0V
tCLKT
tCLKT
Figure 12. Serializer Input Clock Transition Times
tTCP
PCLK
VDDIO/2
tDIS
VDDIO/2
VDDIO/2
tDIH
VDDIO
DIN/HS/VS VDDIO/2
Setup
Hold
VDDIO/2
0V
Figure 13. Serializer Setup/Hold Times
14
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SNLS330J – MAY 2010 – REVISED JANUARY 2014
PDB
(3.3V I/O)
2.0V
PCLK
tPLD
TRI-STATE
DOUT±
TRI-STATE
Output Active
DIN/HS/VS
SYMBOL N
SYMBOL N+1
SYMBOL N+2
| |
Figure 14. Serializer Data Lock Time
SYMBOL N+3
tSD
SYMBOL N
| |
SYMBOL N-1
| |
DOUT+-
SYMBOL N-2
| |
SYMBOL N-3
| |
SYMBOL N-4
| |
|
PCLK
Figure 15. Serializer Delay
2.0V
PDB
(3.3V I/O)
| |
t DDLT
RIN ±
LOCK
|
TRI - STATE
Figure 16. Deserializer Data Lock Time
80%
80%
Deserializer
8 pF
lumped
20%
20%
tCLH
tCHL
Figure 17. Deserializer LVCMOS Output Load and Transition Times
SYMBOL N+4
| |
| |
SYMBOL N+3
| |
RIN±
SYMBOL N+2
| |
SYMBOL N+1
| |
SYMBOL N
t DD
SYMBOL N
| |
SYMBOL N - 1
| ||
SYMBOL N- 2
| |
SYMBOL N - 3
| |
ROUT/
VS/HS
| |
PCLK
SYMBOL N+1
Figure 18. Deserializer Delay
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tROS
VDDIO
VDDIO/2
ROUT/HS/VS
VDDIO/2
0V
tROH
VDDIO
PCLK
VDDIO/2
0V
Figure 19. Deserializer Output Setup/Hold Times
Frequency
FPCLK+
fdev
fdev (max)
FPCLK
FPCLK-
fdev (min)
Time
1 / fmod
Figure 20. Spread Spectrum Clock Output Profile
2
JITTER TRANSFER (dB)
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
1.0E+04
1.0E+05
1.0E+06
1.0E+07
MODULATION FREQUENCY (Hz)
Figure 21. Typical Serializer Jitter Transfer Function Curve at 43 MHz
0.62
JITTER AMPLITUDE (UI)
0.61
0.60
0.59
0.58
0.57
0.56
0.55
0.54
0.53
0.52
1.0E+04
1.0E+05
1.0E+06
1.0E+07
JITTER FREQUENCY (Hz)
Figure 22. Typical Deserializer Input Jitter Tolerance Curve at 43 MHz
16
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SNLS330J – MAY 2010 – REVISED JANUARY 2014
Table 1. DS92LX2121 Control Registers
Addr
(Hex)
0
Name
Bits
Field
R/W
Default
7:1
DEVICE ID
RW
0x58
SER ID
RW
0
0: Device ID is from CAD
1: Register I2C Device ID overrides CAD
0
Reserved.
Standby mode control. Retains control register data.
Supported only when M/S = 0
0: Enabled. Low-current Standby mode with wake-up
capability. Suspends all clocks and functions.
1: Disabled. Standby and wake-up disabled
I2C Device ID
0
7:3
1
7-bit address of Serializer; 0x58h
(1011_000X) default
2
STANDBY
RW
0
1
DIGITAL
RESET0
RW
0
self clear
1: Digital Reset, retained register value
0
DIGITAL RESET1
RW
0
self clear
1: Digital Reset, retains all register values
Reset
2
3
RESERVED
Description
Reserved
7:0
RESERVED
0x20'h
Reserved.
Reserved
7:6
RESERVED
11'b
Reserved.
VDDIO Control
5
VDDIO CONTOL
RW
1
Auto VDDIO detect
Allows manual setting of VDDIO by register.
0: Disable
1: Enable (auto detect mode)
VDDIO Mode
4
VDDIO MODE
RW
1
VDDIO voltage set
Only used when VDDIOCONTROL = 0
0: 1.8V
1: 3.3V
I2C Pass-Through
3
I2C PASSTHROUGH
RW
1
I2C Pass-Through Mode
0: Disabled
1: Enabled
Reserved
2
RESERVED
0
Reserved.
PCLK_AUTO
1
PCLK_AUTO
1
Switch over to internal 25 MHz oscillator clock in the
absence of PCLK
0: disable
1: enable
1
Pixel Clock Edge Select:
0: Parallel Interface Data is strobed on the Falling Clock
Edge.
1: Parallel Interface Data is strobed on the Rising Clock
Edge.
4
TRFB
0
Reserved
7:0
2
5
I C Bus Rate
6
DES ID
TRFB
RW
RW
RESERVED
0x80'h
Reserved.
7:0
I C BUS RATE
RW
0x40'h
I2C SCL frequency is determined by the following: fSCL =
6.25 MHz / Register value (in decimal) 0x40'h = ~100
kHz SCL (default)
Note: Register values <0x32'h are NOT supported.
7:1
DES DEV ID
RW
0x60'h
Deserializer Device ID = 0x60
(1100_000X) default
0
RESERVED
0
Slave Device ID. Sets remote slave I2C address.
0
Reserved.
Reserved
7:0
RESERVED
0
Reserved.
8
RW
Reserved.
RESERVED
Slave ID
SLAVE DEV ID
0
0
7
7:1
2
9
Reserved
7:0
RESERVED
0x01'h
Reserved.
A
Reserved
7:0
RESERVED
0
Reserved.
B
Reserved
7:0
RESERVED
0
Reserved.
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Table 1. DS92LX2121 Control Registers (continued)
Addr
(Hex)
C
Name
Bits
Field
R/W
Reserved
7:3
RESERVED
PCLK Detect
2
PCLK DETECT
R
Default
Description
0
Reserved.
0
1: Valid PCLK detected
0: Valid PCLK not detected
Reserved
1
RESERVED
Cable Link Detect
Status
0
LINK DETECT
D
Reserved
7:0
RESERVED
0x11'h
Reserved.
E
Reserved
7:0
RESERVED
0x01'h
Reserved.
F
Reserved
7:0
RESERVED
0x03'h
Reserved.
10
Reserved
7:0
RESERVED
0x03'h
Reserved.
11
Reserved
7:0
RESERVED
0x03'h
Reserved.
12
Reserved
7:0
RESERVED
0x03'h
Reserved.
7:0
GPCR[7]
GPCR[6]
GPCR[5]
GPCR[4]
GPCR[3]
GPCR[2]
GPCR[1]
GPCR[0]
13
General Purpose
Control Reg
Reserved.
R
RW
0
0
0: Cable link not detected
1: Cable link detected
0: LOW
1: HIGH
Table 2. DS92LX2122 Control Registers
Addr
(Hex)
Name
Bits
7:1
0
7:3
18
R/W
Default
DEVICE ID
RW
0x60h
DES ID
RW
0
I2C Device ID
0
1
Field
RESERVED
0x00'h
Description
7-bit address of Deserializer;
0x60h
(1100_000X) default
0: Device ID is from CAD
1: Register I2C Device ID overrides CAD
Reserved
2
REM_WAKEUP
RW
0
Remote Wake-up Select
1: Enable. Generate remote wakeup signal automatically
wake-up the Serializer in Standby mode
0: Disable. Puts the Serializer in Standby mode
1
DIGITALRESET0
RW
0 self clear
1: Resets the device to default register values. Does not
affect device I2C Bus or Device ID
0
DIGITALRESET1
RW
0 self clear 1: Digital Reset, retained register value
Reset
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Table 2. DS92LX2122 Control Registers (continued)
Addr
(Hex)
Name
Bits
Field
Reserved
7:6
RESERVED
Auto Clock
5
AUTO_CLOCK
OSS Select
4
OSS_SEL
R/W
Default
0
Reserved.
RW
0
1: Output PCLK or internal 25 MHz Oscillator clock
0: Only PCLK when valid PCLK present
RW
0
Output Sleep State Select
0: Outputs = TRI-STATE , when LOCK = L
1: Outputs = LOW, when LOCK = L
0
SSCG Select
0000: Normal Operation, SSCG OFF
0001: fmod (KHz) PCLK/2168, fdev ±0.50%
0010: fmod (KHz) PCLK/2168, fdev ±1.00%
0011: fmod (KHz) PCLK/2168, fdev ±1.50%
0100: fmod (KHz) PCLK/2168, fdev ±2.00%
0101: fmod (KHz) PCLK/1300, fdev ±0.50%
0110: fmod (KHz) PCLK/1300, fdev ±1.00%
0111: fmod (KHz) PCLK/1300, fdev ±1.50%
1000: fmod (KHz) PCLK/1300, fdev ±2.00%
1001: fmod (KHz) PCLK/868, fdev ±0.50%
1010: fmod (KHz) PCLK/868, fdev ±1.00%
1011: fmod (KHz) PCLK/868, fdev ±1.50%
1100: fmod (KHz) PCLK/868, fdev ±2.00%
1101: fmod (KHz) PCLK/650, fdev ±0.50%
1110: fmod (KHz) PCLK/650, fdev ±1.00%
1111: fmod (KHz) PCLK/650, fdev +/-1.50%
2
3
Description
SSCG
3:0
SSCG
Reserved
7:6
RESERVED
VDDIO Control
5
VDDIO CONTROL
RW
1
Auto voltage control
0: Disable
1: Enable (auto detect mode)
VDDIO Mode
4
VDDIO MODE
RW
0
VDDIO voltage set
Only used when VDDIOCONTROL = 0
0: 1.8V
1: 3.3V
I2C Pass-Through
3
I2C PASSTHROUGH
RW
1
I2C Pass-Through Mode
0: Pass-Through Enabled
1: Pass-Through Disabled
Auto ACK
2
AUTO ACK
RW
0
0: Disable
1: Enable
Reserved
1
RESERVED
0
Reserved.
1
Pixel Clock Edge Select
0: Parallel Interface Data is strobed on the Falling Clock
Edge
1: Parallel Interface Data is strobed on the Rising Clock
Edge.
0
EQ Gain
00'h = ~0.0 dB
01'h = ~4.5 dB
03'h = ~6.5 dB
07'h = ~7.5 dB
0F'h = ~8.0 dB
1F'h = ~11.0 dB
3F'h = ~12.5 dB
FF'h = ~14.0 dB
0
Reserved.
RRFB
0
RRFB
11'b
RW
4
EQ Control
7:0
EQ
RW
5
Reserved
7:0
RESERVED
Reserved.
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Table 2. DS92LX2122 Control Registers (continued)
Addr
(Hex)
Name
Bits
Reserved
7
SCL Prescale
6
Remote NACK
Remote NACK
7
8
ID[0] Index
9
ID[1] Index
A
ID[2] Index
B
ID[3] Index
C
ID[4] Index
D
ID[5] Index
E
ID[6] Index
F
ID[7] Index
10
20
SER ID
ID[0] Match
11
ID[1] Match
12
ID[2] Match
13
ID[3] Match
14
ID[4] Match
Field
R/W
Default
Description
RESERVED
Reserved.
6:4
SCL_PRESCALE
0
Prescales the SCL clock line when reading data byte
from a slave device (MODE = 0)
000 : ~100 kHz SCL (default)
001 : ~125 kHz SCL
101 : ~11 kHz SCL
110 : ~33 kHz SCL
111 : ~50 kHz SCL
Other values are NOT supported.
3
REM_NACK_TIM
ER
1
Remote NACK Timer Enable In slave mode (MODE = 1)
if bit is set the I2C core will automatically timeout when
no acknowledge condition was detected.
1: Enable
0: Disable
RW
RW
2:0
REM_NACK_TIME
R
RW
111'b
Remote NACK Timeout
000: 2.0 ms
001: 5.2 ms
010: 8.6 ms
011: 11.8 ms
100: 14.4 ms
101: 18.4 ms
110: 21.6 ms
111: 25.0 ms
7:1
SER DEV ID
RW
0x58h
Serializer Device ID = 0x58
(1011_000X) default
0
RESERVED
7:1
ID[0] INDEX
0
RESERVED
7:1
ID[1] INDEX
0
RESERVED
7:1
ID[2] INDEX
0
RESERVED
7:1
ID[3] INDEX
0
RESERVED
7:1
ID[4] INDEX
0
RESERVED
7:1
ID[5] INDEX
0
RESERVED
7:1
ID[6] INDEX
0
RESERVED
7:1
ID[7] INDEX
0
RESERVED
7:1
ID[0] MATCH
0
RESERVED
7:1
ID[1] MATCH
0
RESERVED
7:1
ID[2] MATCH
0
RESERVED
7:1
ID[3] MATCH
0
RESERVED
7:1
ID[4] MATCH
0
RESERVED
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RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
0
Reserved
0
Target slave Device ID slv_id1 [7:1]
0
Reserved.
0
Target slave Device ID slv_id1 [7:1]
0
Reserved.
0
Target slave Device ID slv_id2 [7:1]
0
Reserved.
0
Target slave Device ID slv_id3 [7:1]
0
Reserved.
0
Target slave Device ID slv_id4 [7:1]
0
Reserved.
0
Target slave Device ID slv_id5 [7:1]
0
Reserved.
0
Target slave Device ID slv_id6 [7:1]
0
Reserved.
0
Target slave Device ID slv_id7 [7:1]
0
Reserved.
0
Alias to match Device ID slv_id0 [7:1]
0
Reserved.
0
Alias to match Device ID slv_id1 [7:1]
0
Reserved.
0
Alias to match Device ID slv_id2 [7:1]
0
Reserved.
0
Alias to match Device ID slv_id3 [7:1]
0
Reserved.
0
Alias to match Device ID slv_id4 [7:1]
0
Reserved.
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Table 2. DS92LX2122 Control Registers (continued)
Addr
(Hex)
Name
15
ID[5] Match
16
ID[6] Match
Bits
Field
7:1
ID[5] MATCH
0
RESERVED
7:1
ID[6] MATCH
0
RESERVED
7:1
ID[7] MATCH
0
RESERVED
R/W
Default
RW
0
Alias to match Device ID slv_id5 [7:1]
0
Reserved
0
Alias to match Device ID slv_id6 [7:1]
0
Reserved.
0
Alias to match Device ID slv_id [7:1]
0
Reserved.
RW
RW
Description
17
ID[7] Match
18
Reserved
7:0
RESERVED
0
Reserved.
19
Reserved
7:0
RESERVED
0x01'h
Reserved.
1A
Reserved
7:0
RESERVED
0
Reserved.
1B
Reserved
7:0
RESERVED
0
Reserved.
Reserved
7:2
RESERVED
0
1C
Signal Detect
Status
1
R
0
0: Active signal not detected
1: Active signal detected
LOCK Pin Status
0
R
0
0: CDR/PLL Unlocked
1: CDR/PLL Locked
1D
Reserved
7:0
RESERVED
0x17'h
Reserved.
1E
Reserved
7:0
RESERVED
0x07'h
Reserved.
1F
Reserved
7:0
RESERVED
0x01'h
Reserved.
20
Reserved
7:0
RESERVED
0x01'h
Reserved.
21
Reserved
7:0
RESERVED
0x01'h
Reserved.
22
Reserved
7:0
RESERVED
0x01'h
Reserved.
General Purpose
Control Reg
7:0
GPCR[7]
GPCR[6]
GPCR[5]
GPCR[4]
GPCR[3]
GPCR[2]
GPCR[1]
GPCR[0]
Reserved
7:1
RESERVED
BIST
0
25
BIST_ERR
7:0
BIST_ERR
26
Remote Wake
Enable
7:6
23
24
27
BCC
0
0: LOW
1: HIGH
0
Reserved.
RW
0
BIST Enable
0: Normal operation
1: Bist Enable
R
0
Bist Error Counter
REM_WAKEUP_E
N
RW
0
11: Enable remote wake up mode
00: Normal operation mode
Other values are NOT supported.
5:0
RESERVED
RW
0
Reserved
7:0
BCC
RW
0
0xE0: Normal operation mode. Users MUST program this
value.
BIST_EN
RW
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FUNCTIONAL DESCRIPTION
The DS92LX2121 / DS92LX2122 Channel Link III chipset is intended for camera applications. The Serializer/
Deserializer chipset operates from a 10 MHz to 50 MHz pixel clock frequency. The DS92LX2121 transforms a
21-bit wide parallel LVCMOS data bus along with a bi-directional back channel control bus into a single highspeed differential pair. The high speed serial bit stream contains an embedded clock and DC-balance information
which enhances signal quality to support AC coupling. The DS92LX2122 receives the single serial data stream
and converts it back into a 21-bit wide parallel data bus together with the back channel data bus.
The control channel function of the DS92LX2121 / DS92LX2122 provides bi-directional communication between
the image sensor and Electronic Control Unit (ECU). The integrated back channel transfers data bi-directionally
over the same differential pair used for video data interface. This interface offers advantages over other chipsets
by eliminating the need for additional wires for programming and control. The back channel bus is controlled via
an I2C port. The bi-directional back channel offers asymmetrical communication and is not dependent on video
blanking intervals.
DISPLAY APPLICATION
The DS92LX2121 / DS92LX2122 chipset is intended for interface between a host (graphics processor, FPGA,
etc.) and a Display. It supports a 21 bit parallel video bus for 18-bit color depth (RGB666) display format. In a
RGB666 configuration, 18 color bits (R [5:0], G[5:0], B[5:0]), Pixel Clock (PCLK) and three control bits (VS, HS
and DE) are supported across the serial link. The DS92LX2121 Serializer accepts a 21-bit parallel data bus
along with a bi-directional control bus. The parallel data and bi-directional control channel information is
converted into a single differential link. The integrated bi-directional control channel bus supports I2C compatible
operation for controlling auxiliary data transport to and from host processor and display module. The
DS92LX2122 Deserializer extracts the clock/control information from the incoming data stream and reconstructs
the 21-bit data with control channel data.
SERIAL FRAME FORMAT
The DS92LX2121 / DS92LX2122 chipset will transmit and receive a pixel of data in the following format:
I2C
CLK0
CLK1
Bit 0 to Bit 20
Figure 23. Serial Bitstream for 28-bit Symbol
The High Speed Forward Channel is a 28-bit symbol composed of 21 bits of data containing video data & control
information transmitted from Serializer to Deserializer. CLK1 and CLK0 represent the embedded clock in the
serial stream. CLK1 is always HIGH and CLK0 is always LOW. This data payload is optimized for signal
transmission over an AC coupled link. Data is randomized, balanced and scrambled.
The bi-directional control channel data is transferred along with the high-speed forward data over the same serial
link. This architecture provides a full duplex low speed forward channel across the serial link together with a high
speed forward channel without the dependence of the video blanking phase.
DESCRIPTION OF BI-DIRECTIONAL CONTROL BUS AND I2C MODES
The I2C compatible interface allows programming of the DS92LX2121, DS92LX2122, or an external remote
device (such as a display) through the bi-directional control channel. Register programming transactions to/from
the DS92LX2121 / DS92LX2122 chipset are employed through the clock (SCL) and data (SDA) lines. These two
signals have open drain I/Os and both lines must be pulled-up to VDDIO by external resistor. Figure 5 shows the
timing relationships of the clock (SCL) and data (SDA) signals. Pull-up resistors or current sources are required
on the SCL and SDA busses to pull them high when they are not being driven low. A logic zero is transmitted by
driving the output low. A logic high is transmitted by releasing the output and allowing it to be pulled-up
externally. The appropriate pull-up resistor values will depend upon the total bus capacitance and operating
speed. The DS92LX2121 / DS92LX2122 I2C bus data rate supports up to 100 kbps according to I2C
specification.
22
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Bus Activity:
Master
SDA Line
Register
Address
Slave
Address
7-bit Address
S
Stop
Start
To start any data transfer, the DS92LX2121 / DS92LX2122 must be configured in the proper I2C mode. Each
device can function as an I2C slave proxy or master proxy depending on the mode determined by M/S pin. The
Ser/Des interface acts as a virtual bridge between the host device and the remote device. When the M/S pin is
set to HIGH, the device is treated as a slave proxy; and acts as a slave on behalf of the remote slave. When
addressing a remote peripheral or Serializer/ Deserializer (not wired directly to the host device), the slave proxy
will forward any byte transactions sent by the host controller to the target device. When M/S pin is set to LOW,
the device will function as a master proxy device, and acts as a master on behalf of the I2C master controller.
Note that the devices must have complementary settings for the M/S configuration. For example, if the Serializer
M/S pin is set to HIGH then the Deserializer M/S pin must be set to LOW and vice-versa.
Data
P
0
A
C
K
A
C
K
A
C
K
Bus Activity:
Slave
S
Register
Address
Slave
Address
7-bit Address
S
0
A
C
K
Bus Activity:
Slave
N
A
C
K
Slave
Address
7-bit Address
A
C
K
Stop
SDA Line
Start
Bus Activity:
Master
Start
Figure 24. Write Byte
P
1
A
C
K
Data
Figure 25. Read Byte
SDA
1
2
6
MSB
R/W
Direction
Bit
Acknowledge
from the Device
7-bit Slave Address
SCL
ACK
LSB
MSB
7
8
9
LSB
N/ACK
Data Byte
*Acknowledge
or Not-ACK
1
8
2
Repeated for the Lower Data Byte
and Additional Data Transfers
START
9
STOP
Figure 26. Basic Operation
SDA
SCL
S
START condition, or
START repeat condition
P
STOP condition
Figure 27. START and STOP Conditions
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1.8V
10k
VDDIO
CAD
4.7k
4.7k
RCAD
HOST
SCL
SCL
SDA
SDA
SER
or
DES
To other
Devices
Figure 28. Serial Control Bus Connection
SLAVE CLOCK STRETCHING
In order to communicate and synchronize with remote devices on the I2C bus through the bi-directional control
channel, slave clock stretching must be supported by the I2C master controller/host device. The chipset utilizes
bus clock stretching (holding the SCL line low) during data transmission; where the I2C slave pulls the SCL line
low on the 9th clock of every I2C data transfer (before the ACK signal). The slave device will not control the clock
and only stretches it until the remote peripheral has responded; which is typically in the order of 12 μs (typical).
CAD PIN ADDRESS DECODER
The CAD pin is used to decode and set the physical slave address of the Serializer/Deserializer (I2C only) to
allow up to six devices on the bus using only a single pin. The pin sets one of six possible addresses for each
Serializer/Deserializer device. The pin must be pulled to VDD (1.8V, NOT VDDIO)) with a 10 kΩ resistor and a
pull down resistor (RID) of the recommended value to set the physical device address. The recommended
maximum resistor tolerance is 0.1% worst case (0.2% total tolerance).
Table 3. DS92LX2121 RID Resistor Values
CAD Values - DS92LX2121 Ser
Resistor RID kΩ
Address 7'b
Address 8'b 0 appended (WRITE)
0
GND
7b' 101 1000 (h'58)
8b' 1011 0000 (h'B0)
2.0k
7b' 101 1001 (h'59)
8b' 1011 0010 (h'B2)
4.7k
7b' 101 1010 (h'5A)
8b' 1011 0100 (h'B4)
8.2k
7b' 101 1011 (h'5B)
8b' 1011 0110 (h'B6)
12.1k
7b' 101 1100 (h'5C)
8b' 1011 1000 (h'B8)
39.0k
7b' 101 1110 (h'5E)
8b' 1011 1100 (h'BC)
Table 4. DS92LX2122 RID Resistor Values
CAD Values - DS92LX2122 Des
24
Resistor RID kΩ
Address 7'b
Address 8'b 0 appended (WRITE)
0
GND
7b' 110 0000 (h'60)
8b' 1100 0000 (h'C0)
2.0k
7b' 110 0001 (h'61)
8b' 1100 0010 (h'C2)
4.7k
7b' 110 0010 (h'62)
8b' 1100 0100 (h'C4)
8b' 1101 0110 (h'C6)
8.2k
7b' 110 0011 (h'63)
12.1k
7b' 110 0100 (h'64)
8b' 1101 1000 (h'C8)
39.0k
7b' 110 0110 (h'66)
8b' 1100 1100 (h'CC)
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CAMERA MODE OPERATION
In Camera mode, I2C transactions originate from the Deserializer from the host controller. The I2C slave core in
the Deserializer will detect if a transaction is intended for the Serializer or a slave at the Serializer. Commands
are sent over the bi-directional control channel to initiate the transactions. The Serializer will receive the
command and generate an I2C transaction on its local I2C bus. At the same time, the Serializer will capture the
response on the I2C bus and return the response as a command on the forward channel link. The Deserializer
parses the response and passes the appropriate response to the Deserializer I2C bus.
To configure the devices for camera mode operation, set the Serializer M/S pin to LOW and the Deserializer M/S
pin to HIGH. Before initiating any I2C commands, the Deserializer needs to be programmed with the target slave
device addresses and Serializer device address. SER_DEV_ID Register 0x07h sets the Serializer device
address and SLAVE_x_MATCH/SLAVE_x_INDEX registers 0x08h~0x17h set the remote target slave addresses.
The slave address match registers must also be set. In slave mode the address register is compared with the
address byte sent by the I2C master. If the addresses are equal to any of registers values, the I2C slave will
acknowledge the transaction to the I2C master allowing reads or writes to target device.
DISPLAY MODE OPERATION
In Display mode, I2C transactions originate from the controller attached to the Serializer. The I2C slave core in
the Serializer will detect if a transaction targets (local) registers within the Serializer or the (remote) registers
within the Deserializer or a remote slave connected to the I2C master interface of the Deserializer. Commands
are sent over the forward channel link to initiate the transactions. The Deserializer will receive the command and
generate an I2C transaction on its local I2C bus. At the same time, the Deserializer will capture the response on
the I2C bus and return the response as a command on the bi-directional control channel. The Serializer parses
the response and passes the appropriate response to the Serializer I2C bus.
The physical device ID of the I2C slave in the Serializer is determined by the analog voltage on the CAD pin
input. It can be reprogrammed by using the SER_DEV_ID register and setting the bit . The device ID of the
logical I2C slave in the Deserializer is determined by programming the DES ID in the Serializer. The state of the
CAD pin input on the Deserializer is used to set the device ID. The I2C transactions between Ser/ Des will be
bridged between the host to the remote slave.
To configure the devices for display mode operation, set the Serializer M/S pin to HIGH and the Deserializer M/S
pin to LOW. Before initiating any I2C commands, the Serializer needs to be programmed with the target slave
device address and Serializer device address. DES_DEV_ID Register 0x06h sets the Deserializer device
address and SLAVE_DEV_ID register 0x7h sets the remote target slave address. If the I2C slave address
matches any of registers values, the I2C slave will acknowledge the transaction allowing read or write to target
device. Note: In Display mode operation, registers 0x08h~0x17h on Deserializer must be reset to 0x00.
PROGRAMMABLE CONTROLLER
An integrated I2C slave controller is embedded in each of the DS92LX2121 Serializer and DS92LX2122
Deserializer. It must be used to access and program the extra features embedded within the configuration
registers. Refer to Table 1 and Table 2 for details of control registers.
I2C PASS THROUGH
I2C pass-through provides an alternative means to independently address slave devices. The mode enables or
disables I2C bidirectional control channel communication to the remote I2C bus. This option is used to determine
whether or not an I2C instruction is to be transferred over to the remote I2C device. When enabled, the I2C bus
traffic will continue to pass through and will be received by I2C devices downstream. If disabled, I2C commands
will be excluded to the remote I2C device. The pass through function also provides access and communication to
only specific devices on the remote bus. The feature is effective for both Camera mode and Display mode.
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SYNCHRONIZING MULTIPLE LINKS
For applications requiring synchronization across multiple links, it is recommended to utilize the General Purpose
Input/ Output (GPI/GPO) pins to transmit control signals to synchronize slave peripherals together. To
synchronize the peripherals properly, the system controller needs to provide a sync signal output. Note this form
of synchronization timing relationship has a non-deterministic latency. After the control data is reconstructed from
the bi-directional control channel, there will be a time variation of the GPI/GPO signals arriving at the different
target devices (between the parallel links). The maximum latency delta (t1) of the GPI/GPO data transmitted
across multiple links is 25 μs.
Note: The user must verify that the timing variations between the different links are within their system and timing
specifications.
The maximum time (t1) between the rising edge of GPI/GPO (i.e. sync signal) arriving at Camera A and Camera
B is 25 μs.
DES A
GPIO[n] Input
SER B
GPIO[n] Output
|
SER A
GPIO[n] Output
|
DES B
GPIO[n] Input
t1
Figure 29. GPIO Delta Latency
GENERAL PURPOSE I/O (GPIO)
The DS92LX2121 / DS92LX2122 has up to 4 GPO and 4 GPI on the Serializer and Deserializer respectively.
The GPI/GPO maximum switching rate is up to 66 kHz for communication between Deserializer GPI to Serializer
GPO.
AT-SPEED BIST (BISTEN, PASS)
An optional AT SPEED Built in Self Test (BIST) feature supports at speed testing of the high-speed serial and
the back-channel link. Control pins allow the system to initiate the test and set the duration. A HIGH on PASS pin
indicates that all payloads received during the test were error free during the BIST duration test. A LOW on this
pin at the conclusion of this test indicates that one or more payloads were detected with errors.
The BIST duration is defined by the width of BISTEN. BIST starts when BISTEN goes HIGH. BIST ends when
BISTEN goes LOW. PASS flag will go HIGH when no errors detected after BIST Duration completes. Any errors
detected after the BIST Duration are not included in PASS logic.
The following diagram shows how to perform system AT SPEED BIST:
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Serializer MODE = 0 and Deserializer MODE = 1
Apply power for Serializer and Deserializer
Normal
Step 1: Enable AT SPEED BIST by placing the
Deserializer in BIST by mode setting BISTEN = H
BIST Wait
Step 4: Place System in
Normal Operating Mode
BISTEN = L
Step 2: Deserializer will setup Serializer and enable BIST
mode through Bidirectional control channel
communication and then reacquire forward channel clock
BIST Start
Step 3: Stop AT SPEED BIST by turning off BIST
mode with BISTEN = L at the Deserializer.
BIST Stop
Figure 30. AT-SPEED BIST System Flow Diagram
Step 1: Place the Deserializer in BIST Mode.
Serializer and Deserializer power supply must be supplied. Set the Serializer M/S pin to LOW and the
Deserializer M/S pin to HIGH. Enable the AT SPEED BIST mode on the Deserializer by setting the BISTEN pin
High. The DS92LX2122 GPIO[1:0] pins are used to select the PCLK frequency of the on-chip oscillator for the
BIST test on high speed data path.
Table 5. Oscillator Frequency Select
Freq Control
Oscillator Range
min (MHz)
typ (MHz)
00
External PCLK
10
01
Internal
10
Internal
25
11
Internal
12.5
max (MHz)
50
50
The Deserializer GPIO[1:0] set to 00 will bypass the on-chip oscillator and an external oscillator to Serializer
PCLK input is required. This allows the user to operate BIST under different frequencies other than the
predefined ranges.
Step 2: Enable AT SPEED BIST by placing the Serializer into BIST mode.
Deserializer will communicate through the back-channel to configure Serializer into BIST mode. Once the BIST
mode is set, the Serializer will initiate BIST transmission to the Deserializer.
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Wait 10 ms for Deserializer to acquire lock and then monitor the LOCK pin transition from LOW to HIGH. At this
point, AT SPEED BIST is operational and the BIST process has begun. The Serializer will start transfer of an
internally generated PRBS data pattern through the high speed serial link. This pattern traverses across the
interconnecting link to the Deserializer. Check the status of the PASS pin; a HIGH indicates a pass, a LOW
indicates a fail. A fail will stay LOW for ½ a clock cycle. If two or more bits fail in a row the PASS pin will toggle ½
clock cycle HIGH and ½ clock cycle low. The user can use the PASS pin to count the number of fails on the high
speed link. In addition, there is a defined SER and DES register that will keep track of the accumulated error
count. The Serializer DS92LX2121 GPIO[0] pin will be assigned as a PASS flag error indicator for the backchannel link.
Recovered
Pixel Clock
Case 1: No bit errors
Start Pixel
BISTEN
Recovered
Pixel Data
PASS
Previous
³&5&´6WDWH
³&5&´6WDWH
Case 2: Bit error(s)
Recovered
Pixel Data
PASS
B
B
B
B
Previous
³&5&´6WDWH
³&5&´6WDWH
E
E
E
E
Case 3: Bit error(s) AFTER BIST Duration
Recovered
Pixel Data
PASS
B
Previous
³&5&´6WDWH
B = Bad Pixel
PE = Payload Error
³&5&´6WDWH
BIST Duration
(when BISTEN=H)
CRC Status
(when BISTEN=L)
Figure 31. BIST Timing Diagram
Step 3: Stop at SPEED BIST by turning off BIST mode in the Deserializer to determine Pass/Fail.
To end BIST, the system must pull BISTEN pin of the Deserializer LOW. The BIST duration is fully defined by
the BISTEN width and thus the Bit Error Rate is determined by how long the system holds BISTEN HIGH.
fpixel (MHz)
BIST Duration (s)
x Total Pixels Transmitted = Total Bits Transmitted
= BIST Duration (s) x
Pixel
1 Pixel period (ns) x Total Bits
Bit (Pixel) Error Rate
-1
= [Total Bits Transmitted]
(for passing BIST)
=
[Total Bits Transmitted x Bits/Pixel] -1
Figure 32. BIST BER Calculation
For instance, if BISTEN is held HIGH for 1 second and the PCLK is running at 43 MHz with 16 bpp, then the Bit
Error Rate is no better than 1.46E-9.
Step 4: Place system in Normal Operating Mode by disabling BIST at the Serializer.
Once Step 3 is complete, AT SPEED BIST is over and the Deserializer is out of BIST mode. To fully return to
Normal mode, apply Normal input data into the Serializer.
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Any PASS result will remain unless it is changed by a new BIST session or cleared by asserting and releasing
PDB. The default state of PASS after a PDB toggle is HIGH.
It is important to note that AT SPEED BIST will only determine if there is an issue on the link that is not related to
the clock and data recovery of the link (whose status is flagged with LOCK pin).
LVCMOS VDDIO OPTION
1.8V or 3.3V SER Inputs and DES Outputs are user configurable to provide compatibility with 1.8V and 3.3V
system interfaces.
REMOTE WAKE UP (Camera Mode)
After initial power up, the SER is in a low-power Standby mode. The DES (controlled by the host ) 'Remote
Wakeup' register allows the DES side to generate a signal across the link to remotely wakeup the SER. Once the
SER detects the wakeup signal, the SER switches from Standby mode to active mode. In active mode, the SER
locks onto PCLK input (if present), otherwise the on-chip oscillator is used as the input clock source. Note the
host controller should monitor the DES LOCK pin and confirm LOCK = H before performing any I2C
communication across the link.
For Remote Wakeup to function properly:
• The chipset needs to be configured in Camera mode: Serializer M/S = 0 and Deserializer M/S = 1
• The SER expects remote wake up by default at power on.
• Configure the control channel driver of the DES to be in remote wake up mode by setting DES register 0x26
to 0xC0.
• Perform remote wake up on SER by setting DES register 0x01 b[2] to 1.
• Return the control channel driver of the DES to the normal operation mode by setting DES register 0x26 to 0.
The SER can also be put into standby mode by programming the DES remote wake up control register 0x01 b[2]
REM_WAKEUP to 0.
POWERDOWN
The SER has a PDB input pin to ENABLE or Powerdown the device. The modes can be controlled by the host
and is used to disable the Link to save power when the remote device is not operational. An auto mode is also
available. In this mode, the PDB pin is tied High and the SER switches over to an internal oscillator when the
PCLK stops or not present. When a PCLK starts again, the SER will then lock to the valid input PCLK and
transmits the data to the DES. In powerdown mode, the high-speed driver outputs are static (HIGH).
The DES has a PDB input pin to ENABLE or Powerdown the device. This pin can be controlled by the system
and is used to disable the DES to save power. An auto mode is also available. In this mode, the PDB pin is tied
High and the DES will enter powerdown when the serial stream stops. When the serial stream starts up again,
the DES will lock to the input stream and assert the LOCK pin and output valid data. In powerdown mode, the
Data and PCLK outputs are set by the OSS_SEL control register.
POWER UP REQUIREMENTS AND PDB PIN
The VDD (VDDn and VDDIO) supply ramp should be faster than 1.5 ms with a monotonic rise. If slower then 1.5
ms then a capacitor on the PDB pin is needed to ensure PDB arrives after all the VDD have settled to the
recommended operating voltage. When PDB pin is pulled to VDDIO, it is recommended to use a 10 kΩ pull-up
and a 22 uF cap to GND to delay the PDB input signal.
SIGNAL QUALITY ENHANCERS
Des - Receiver Input Equalization (EQ)
The receiver inputs provided input equalization filter in order to compensate for loss from the media. The level of
equalization is controlled via register setting.
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EMI REDUCTION
Des - Receiver Staggered Output
The Receiver staggered outputs allows for outputs to switch in a random distribution of transitions within a
defined window. Outputs transitions are distributed randomly. This minimizes the number of outputs switching
simultaneously and helps to reduce supply noise. In addition it spreads the noise spectrum out reducing overall
EMI.
Des Spread Spectrum Clocking Compatibilty
The DS92LX2122 parallel data and clock outputs have programmable SSCG ranges from 70 kHz and +-2% (4%
total) from 20 MHz to 50 MHz. The modulation rate and modulation frequency variation of output spread is
controlled through the SSC control registers.
PIXEL CLOCK EDGE SELECT (TRFB/RRFB)
The TRFB/RRFB selects which edge of the Pixel Clock is used. For the SER, this register determines the edge
that the data is latched on. If TRFB register is 1, data is latched on the Rising edge of the PCLK. If TRFB register
is 0, data is latched on the Falling edge of the PCLK. For the DES, this register determines the edge that the
data is strobed on. If RRFB register is 1, data is strobed on the Rising edge of the PCLK. If RRFB register is 0,
data is strobed on the Falling edge of the PCLK.
PCLK
DIN/
ROUT
TRFB/RRFB: 0
TRFB/RRFB: 1
Figure 33. Programmable PCLK Strobe Select
Applications Information
AC COUPLING
The SER/DES supports only AC-coupled interconnects through an integrated DC balanced decoding scheme.
External AC coupling capacitors must be placed in series in the Channel Link III signal path as illustrated in
Figure 34.
DOUT+
RIN+
DOUT-
RIN-
D
R
Figure 34. AC-Coupled Application
For high-speed Channel Link III transmissions, the smallest available package should be used for the AC
coupling capacitor. This will help minimize degradation of signal quality due to package parasitics. The I/O’s
require a 0.1 μF AC coupling capacitors to the line.
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SNLS330J – MAY 2010 – REVISED JANUARY 2014
TYPICAL APPLICATION CONNECTION
Figure 35 shows a typical connection of the DS92LX2121 Serializer.
DS92LX2121 (SER)
VDDIO
VDDIO
C12
FB1
C8
1.8V
VDDT
C4
FB2
C10
C5
FB3
C11
C6
FB4
C7
FB5
C3
DIN0
DIN1
DIN2
DIN3
DIN4
DIN5
DIN6
DIN7
DIN8
DIN9
DIN10
DIN11
DIN12
DIN13
LVCMOS
Parallel
Bus
DIN14
DIN15
DIN16
DIN17
DIN18
DIN19
DIN20
MODE
PDB
GPO
Control
Interface
GPO[0]
GPO[1]
GPO[2]
GPO[3]
VDDCML
VDDD
C1
I2C
Bus
Interface
C2
1.8V
10 k:
ID[X]
RID
NOTE:
C1 - C2 = 0.1 PF (50 WV)
C3 - C9 = 0.1 PF
C10 - C13 = 4.7 PF
C14 - C15 = >100 pF
RPU = 1 k: to 4.7 k:
RID (see ID[x] Resistor Value Table)
FB1 - FB7: Impedance = 1 k: (@ 100 MHz)
low DC resistance (<1:)
RPU
SCL
FB6
SDA
FB7
C14
Serial
Channel
Link III
Interface
DOUT+
DOUT-
VDDIO
RPU
C13
VDDPLL
PCLK
LVCMOS
Control
Interface
C9
RES
DAP (GND)
C15
Optional
The "Optional" components shown are
provisions to provide higher system noise
immunity and will therefore result in higher
performance.
Optional
Figure 35. DS92LX2121 Typical Connection Diagram
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Figure 36 shows a typical connection of the DS92LX2122 Deserializer.
DS92LX2122 (DES)
1.8V
VDDD
C13
C11
FB1
C3
FB2
C4
FB3
C5
FB5
C16
C7
VDDCML
C1
Serial
Channel
Link III
Interface
RIN+
RINC2
TP_A
RES_PIN38
RES_PIN39
TP_B
LVCMOS
Control
Interface
MODE
PDB
VDDIO
RPU
I2C
Bus
Interface
C12
C14
VDDIO2
VDDIO3
C10
VDDPLL
C6
FB6
C9
VDDSSCG
C15
VDDIO1
C8
VDDR
FB4
VDDIO
ROUT0
ROUT1
ROUT2
ROUT3
ROUT4
ROUT5
ROUT6
ROUT7
ROUT8
ROUT9
ROUT10
ROUT11
ROUT12
ROUT13
LVCMOS
Parallel
Bus
ROUT14
ROUT15
ROUT16
ROUT17
ROUT18
ROUT19
ROUT20
PCLK
GPI[0]
GPI[1]
GPI[2]
GPI[3]
RPU
GPI
Control
Interface
SCL
FB7
SDA
FB8
C17
LOCK
PASS
1.8V
C18
Optional
Optional
NOTE:
C1 - C2 = 0.1 PF (50 WV)
C3 - C12 = 0.1 PF
C13 - C16 = 4.7 PF
C17 - C18 = >100 pF
RPU = 1 k: to 4.7 k:
RID (see ID[x] Resistor Value Table)
FB1 - FB8: Impedance = 1 k: (@ 100 MHz)
low DC resistance (<1:)
10 k:
ID[X]
RES_PIN46
DAP (GND)
RID
The "Optional" components shown are
provisions to provide higher system noise
immunity and will therefore result in higher
performance.
Figure 36. DS92LX2122 Typical Connection Diagram
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SNLS330J – MAY 2010 – REVISED JANUARY 2014
TRANSMISSION MEDIA
The Ser/Des chipset is intended to be used over a wide variety of balanced cables depending on distance and
signal quality requirements. The Ser/Des employ internal termination providing a clean signaling environment.
The interconnect for Channel Link III interface should present a differential impedance of 100 Ohms. Use of
cables and connectors that have matched differential impedance will minimize impedance discontinuities.
Shielded or un-shielded cables may be used depending upon the noise environment and application
requirements. The chipset's optimum cable drive performance is achieved at 43 MHz at 10 meters length. The
maximum signaling rate increases as the cable length decreases. Therefore, the chipset supports 50 MHz at
shorter distances. Other cable parameters that may limit the cable's performance boundaries are: cable
attenuation, near-end crosstalk and pair-to-pair skew.
For obtaining optimal performance the system should use:
• Shielded Twisted Pair (STP) cable
• 100Ω ± 10% differential impedance and 24 AWG (or lower AWG) cable
• Low intra-pair skew (less than 0.1UI), impedance matched
• Terminate unused conductors
• Optimum settings for deserializer Register 0x27 (See Table 2)
PCB LAYOUT AND POWER SYSTEM CONSIDERATIONS
Circuit board layout and stack-up for the Ser/Des devices should be designed to provide low-noise power feed to
the device. Good layout practice will also separate high frequency or high-level inputs and outputs to minimize
unwanted stray noise pickup, feedback and interference. Power system performance may be greatly improved by
using thin dielectrics (2 to 4 mils) for power / ground sandwiches. This arrangement provides plane capacitance
for the PCB power system with low-inductance parasitics, which has proven especially effective at high
frequencies, and makes the value and placement of external bypass capacitors less critical. External bypass
capacitors should include both RF ceramic and tantalum electrolytic types. RF capacitors may use values in the
range of 0.01 uF to 0.1 uF. Tantalum capacitors may be in the 2.2 uF to 10 uF range. Voltage rating of the
tantalum capacitors should be at least 5X the power supply voltage being used.
Surface mount capacitors are recommended due to their smaller parasitics. When using multiple capacitors per
supply pin, locate the smaller value closer to the pin. A large bulk capacitor is recommend at the point of power
entry. This is typically in the 50uF to 100uF range and will smooth low frequency switching noise. It is
recommended to connect power and ground pins directly to the power and ground planes with bypass capacitors
connected to the plane with via on both ends of the capacitor. Connecting power or ground pins to an external
bypass capacitor will increase the inductance of the path.
A small body size X7R chip capacitor, such as 0603, is recommended for external bypass. Its small body size
reduces the parasitic inductance of the capacitor. The user must pay attention to the resonance frequency of
these external bypass capacitors, usually in the range of 20-30 MHz. To provide effective bypassing, multiple
capacitors are often used to achieve low impedance between the supply rails over the frequency of interest. At
high frequency, it is also a common practice to use two vias from power and ground pins to the planes, reducing
the impedance at high frequency.
Some devices provide separate power for different portions of the circuit. This is done to isolate switching noise
effects between different sections of the circuit. Separate planes on the PCB are typically not required. Pin
Description tables typically provide guidance on which circuit blocks are connected to which power pin pairs. In
some cases, an external filter many be used to provide clean power to sensitive circuits such as PLLs.
Use at least a four layer board with a power and ground plane. Locate LVCMOS signals away from the
differential lines to prevent coupling from the LVCMOS lines to the differential lines. Closely-coupled differential
lines of 100 Ohms are typically recommended for differential interconnect. The closely coupled lines help to
ensure that coupled noise will appear as common-mode and thus is rejected by the receivers. The tightly coupled
lines will also radiate less.
Information on the LLP style package is provided in the AN-1187 Leadless Leadframe Package (LLP) Application
Report (literature number SNOA401).
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INTERCONNECT GUIDELINES
For full details, see the Channel-Link PCB and Interconnect Design-In Guidelines (literature number SNLA008)
and the Transmission Line RAPIDESIGNER Operation and Applications Guide (literature number SNLA035).
• Use 100Ω coupled differential pairs
• Use the S/2S/3S rule in spacings
– S = space between the pair
– 2S = space between pairs
– 3S = space to LVCMOS signal
• Minimize the number of Vias
• Use differential connectors when operating above 500Mbps line speed
• Maintain balance of the traces
• Minimize skew within the pair
Additional general guidance can be found in the LVDS Owner’s Manual (literature number SNLA187), which is
available in PDF format from the TI LVDS & CML Solutions web site.
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SNLS330J – MAY 2010 – REVISED JANUARY 2014
REVISION HISTORY
Changes from Revision I (April 2013) to Revision J
Page
•
Changed "tri-state" and "low" OSS values to reflect correct bit definition .......................................................................... 19
•
Added user-recommended value for deserializer echo cancellation in general-purpose cables ....................................... 21
•
Added tolerance for transmission cable impedance ........................................................................................................... 33
•
Added tolerance range for transmission cable skew .......................................................................................................... 33
•
Added reference to optimum settings information in deserialzier Reg 0x27 ...................................................................... 33
Changes from Revision H (April 2013) to Revision I
•
Page
Changed layout of National Data Sheet to TI format .......................................................................................................... 34
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PACKAGE OPTION ADDENDUM
www.ti.com
12-Jun-2014
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)
DS92LX2121SQ/NOPB
ACTIVE
WQFN
RTA
40
1000
Green (RoHS
& no Sb/Br)
CU SN
Level-3-260C-168 HR
-40 to 85
LX2121
DS92LX2121SQE/NOPB
ACTIVE
WQFN
RTA
40
250
Green (RoHS
& no Sb/Br)
CU SN
Level-3-260C-168 HR
-40 to 85
LX2121
DS92LX2121SQX/NOPB
ACTIVE
WQFN
RTA
40
2500
Green (RoHS
& no Sb/Br)
CU SN
Level-3-260C-168 HR
-40 to 85
LX2121
DS92LX2122SQ/NOPB
ACTIVE
WQFN
RHS
48
1000
Green (RoHS
& no Sb/Br)
CU SN
Level-3-260C-168 HR
-40 to 85
LX2122
DS92LX2122SQE/NOPB
ACTIVE
WQFN
RHS
48
250
Green (RoHS
& no Sb/Br)
CU SN
Level-3-260C-168 HR
-40 to 85
LX2122
DS92LX2122SQX/NOPB
ACTIVE
WQFN
RHS
48
2500
Green (RoHS
& no Sb/Br)
CU SN
Level-3-260C-168 HR
-40 to 85
LX2122
(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.
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
12-Jun-2014
(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.
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
www.ti.com
22-Nov-2013
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device
Package Package Pins
Type Drawing
DS92LX2121SQ/NOPB
WQFN
RTA
40
DS92LX2121SQE/NOPB
WQFN
RTA
DS92LX2121SQX/NOPB
WQFN
RTA
DS92LX2122SQ/NOPB
WQFN
DS92LX2122SQE/NOPB
DS92LX2122SQX/NOPB
SPQ
Reel
Reel
A0
Diameter Width (mm)
(mm) W1 (mm)
B0
(mm)
K0
(mm)
P1
(mm)
W
Pin1
(mm) Quadrant
1000
330.0
16.4
6.3
6.3
1.5
12.0
16.0
Q1
40
250
178.0
16.4
6.3
6.3
1.5
12.0
16.0
Q1
40
2500
330.0
16.4
6.3
6.3
1.5
12.0
16.0
Q1
RHS
48
1000
330.0
16.4
7.3
7.3
1.3
12.0
16.0
Q1
WQFN
RHS
48
250
178.0
16.4
7.3
7.3
1.3
12.0
16.0
Q1
WQFN
RHS
48
2500
330.0
16.4
7.3
7.3
1.3
12.0
16.0
Q1
Pack Materials-Page 1
PACKAGE MATERIALS INFORMATION
www.ti.com
22-Nov-2013
*All dimensions are nominal
Device
Package Type
Package Drawing
Pins
SPQ
Length (mm)
Width (mm)
Height (mm)
DS92LX2121SQ/NOPB
WQFN
RTA
40
1000
367.0
367.0
38.0
DS92LX2121SQE/NOPB
WQFN
RTA
40
250
213.0
191.0
55.0
DS92LX2121SQX/NOPB
WQFN
RTA
40
2500
367.0
367.0
38.0
DS92LX2122SQ/NOPB
WQFN
RHS
48
1000
367.0
367.0
38.0
DS92LX2122SQE/NOPB
WQFN
RHS
48
250
213.0
191.0
55.0
DS92LX2122SQX/NOPB
WQFN
RHS
48
2500
367.0
367.0
38.0
Pack Materials-Page 2
PACKAGE OUTLINE
RTA0040A
WQFN - 0.8 mm max height
SCALE 2.200
PLASTIC QUAD FLATPACK - NO LEAD
6.1
5.9
A
B
PIN 1 INDEX AREA
6.1
5.9
0.5
0.3
0.3
0.2
DETAIL
OPTIONAL TERMINAL
TYPICAL
0.8 MAX
C
SEATING PLANE
0.08
0.05
0.00
4.6 0.1
36X 0.5
10
(0.1) TYP
EXPOSED
THERMAL PAD
20
11
21
4X
4.5
SEE TERMINAL
DETAIL
1
PIN 1 ID
(OPTIONAL)
30
40
31
40X
0.5
0.3
40X
0.3
0.2
0.1
0.05
C A
B
4214989/A 12/2014
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. The package thermal pad must be soldered to the printed circuit board for thermal and mechanical performance.
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EXAMPLE BOARD LAYOUT
RTA0040A
WQFN - 0.8 mm max height
PLASTIC QUAD FLATPACK - NO LEAD
( 4.6)
SYMM
40X (0.25)
31
40
40X (0.6)
1
30
36X (0.5)
(0.74)
TYP
SYMM
(5.8)
(1.48)
TYP
( 0.2) TYP
VIA
10
21
(R0.05) TYP
11
20
(0.74) TYP
(1.48) TYP
(5.8)
LAND PATTERN EXAMPLE
SCALE:12X
0.07 MIN
ALL AROUND
0.07 MAX
ALL AROUND
SOLDER MASK
OPENING
METAL
SOLDER MASK
OPENING
METAL UNDER
SOLDER MASK
NON SOLDER MASK
DEFINED
(PREFERRED)
SOLDER MASK
DEFINED
SOLDER MASK DETAILS
4214989/A 12/2014
NOTES: (continued)
4. This package is designed to be soldered to a thermal pad on the board. For more information, see Texas Instruments literature
number SLUA271 (www.ti.com/lit/slua271).
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EXAMPLE STENCIL DESIGN
RTA0040A
WQFN - 0.8 mm max height
PLASTIC QUAD FLATPACK - NO LEAD
(1.48) TYP
9X ( 1.28)
31
40
40X (0.6)
1
30
40X (0.25)
36X (0.5)
(1.48)
TYP
SYMM
(5.8)
METAL
TYP
10
21
(R0.05) TYP
20
11
SYMM
(5.8)
SOLDER PASTE EXAMPLE
BASED ON 0.125 mm THICK STENCIL
EXPOSED PAD
70% PRINTED SOLDER COVERAGE BY AREA
SCALE:15X
4214989/A 12/2014
NOTES: (continued)
5. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
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