MAX96708 datasheet(66/68 Pages) MAXIM

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PRBS

The serializer includes a PRBS pattern generator that

works with bit-error verification in the deserializer. To

run the PRBS test, set PRBSEN = 1 (0x04, D5) in the

deserializer, then in the serializer. To exit the PRBS

test, set PRBSEN = 0 (0x04, D5) in the serializer. The

deserializerautomaticallyendsPRBScheckingandsetsthe

PRBS_OK bit high. Note that during PRBS mode, the

remote control channel is not available except to exit

PRBS mode if I2C_LOC_ACK = 1; otherwise, the remote

control channel is not available at all.

To run the PRBS with a 3Gbps SerDes, first set the

PRBS_TYPE bit = 0 in the MAX967XX. Then set PRBSEN

= 1 (0x04, D5) in the serializer, then in the deserializer. To

exit the PRBS test, set PRBSEN = 0 (0x04, D5) in the

deserializer, then in the serializer.

During PRBS test, ERRB function changes to reflect

PRBS errors only. ERRB goes low when any PRBS errors

occur. ERRB goes high when the PRBS error counter is

reset when PRBS_ERR is read. Normal ERRB function

resumes when exiting the PRBS test.

GPI/GPO

GPO on the serializer follows GPI transitions on the

deserializer. By default, the GPI-to-GPO delay is 0.35ms

(max). Keep the time between GPI transitions to a

minimum 0.35ms. GPI_IN the deserializer stores the GPI

input state. GPO is low after power-up. The µC can set

GPO by writing to the SET_GPO register bit. Do not send

a logic-low value on the deserializer RX/SDA input (UART

mode) longer than 100µs in either base or bypass mode

to ensure proper GPO/GPI functionality.

Fast Detection of Loss-of-Lock

A measure of link quality is the recovery time from loss of

synchronization. The host can be quickly notified of loss-

of-lock by connecting the deserializer’s LOCK output to

the GPI input. If other sources use the GPI input, such as

a touch-screen controller, the μC can implement a routine

to distinguish between interrupts from loss-of-sync and

normal interrupts. Reverse control-channel communica-

tion does not require an active forward link to operate

and accurately tracks the LOCK status of the GMSL link.

LOCK asserts for video link only and not for the configura-

tion link.

Providing a Frame Sync (Camera Applications)

The GPI and GPO provide a simple solution for camera

applications that require a frame sync signal from the

ECU (e.g., surround-view systems). Connect the ECU

frame sync signal to the GPI input and connect the GPO

output to the camera-frame sync input. GPI/GPO have

a typical delay of 275μs. Skew between multiple GPI/

GPO channels is 115μs (max). If a lower-skew signal is

required, connect the camera’s frame-sync input to one

of the serializer’s GPIOs and use an I2C broadcast write

command to change the GPIO output state. This has a

maximum skew of 1.5µs, independent from the used I2C

bit rate.

Entering/Exiting Sleep Mode

The procedure for entering and exiting sleep mode depends

on the location of the microcontroller, and the type of

control-channel interface used. If wake-up from a remote-

side (serializer-side) microcontroller is not needed or

desired, set the DIS_RWAKE bit = 1 to shut down remote

wake-up for further power savings.

When the microcontroller is on the deserializer side, first

put the serializer to sleep, or disable serialization. Next, set

SLEEP = 1 in deserializer. The device sleeps after 8ms.

To wake up the device, send an arbitrary control-channel

command to the deserializer (the device will not send an

acknowledge), wait for 5ms for the chip to power up and

then set SLEEP = 0 to make the wake-up permanent.

When µC is on the serializer side, set SLEEP = 1 in

deserializer. Next, disable serialization. The device sleeps

after 8ms. To wake up the deserializer, reenable serializa-

tion. The deserializer wakes up and clears its SLEEP bit

when it locks to the serializer.

VENDOR

CONNECTOR

CABLE

TYPE

Rosenberger

59S2AX-400A5-Y

Dacar 302

Coax

Rosenberger

D4S10A-40ML5-Z

Dacar 535-2

STP

Nissei

GT11L-2S

F-2WME AWG28

STP

JAE

MX38-FF

A-BW-Lxxxxx

STP

Table 11. Suggested Connectors and Cables for GMSL

www.maximintegrated.com

Maxim Integrated │ 66

MAX96708

14-Bit GMSL Deserializer

with Coax or STP Cable Input

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