MAX96708 datasheet(31/68 Pages) MAXIM

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Shutdown/Sleep Modes

Several sleep and shutdown modes are available when

full operation is not needed.

Configuration Link

When the high-speed video link is not needed, or unavail-

able, a configuration link can be used in its place. In

configuration-link mode, the parallel-digital input/output

is disabled, the LOCK pin remains low, and the serial link

internally generates its own clock, to allow full operation

of the control channel (UART/I2C and GPIO).

Serialization Disable

When the serial link is not needed, such as when down-

stream devices are powered off, the user can disable

serialization. In this mode, all forward communication is

shut down. The user can reenable serialization either

locally or through the reverse channel.

Sleep Mode

To reduce power consumption further, the devices can

be put into sleep mode. In this mode, all registers keep

their programmed values, and all functions in the device

are powered down except for the wake-up detectors on

the local I2C/UART interface, and the serial link. Any

activity seen by the wake-up detectors temporarily turns

on the control-channel interface. During this time, a micro-

controller can command the device to exit sleep mode.

See the Entering/Exiting Sleep Mode section.

Power-Down Mode

The lowest power-consumption mode is power-down

mode. In this mode, all functions are powered down, and

all register values are lost.

Link-Startup Procedure

Table 2 lists the startup procedure for image-sensing

applications. The control channel is available after the

video link or the configuration link is established. If the

deserializer powers up after the serializer, the control

channel becomes unavailable until 2ms after power-up.

NO.

ΜC

SERIALIZER

DESERIALIZER

—

μC connected to deserializer.

Set all configuration inputs.

Powers up. Wait tPU.

Powers up and loads default

settings. Establishes video link

when valid PCLK available.

Powers up and loads default

settings. Locks to video-link

signal if available.

(If no PCLK) Programs CLINKEN, SEREN, and/or

AUTOCLINK bits. Wait 5ms after each command.

Establishes configuration link.

Locks to config link if available.

(If not locked) Sets any additional configuration bits

that are mismatched between serializer and

deserializer (e.g BWS, CX/TP). Wait 5ms for lock

after each command.

Configuration changed.

Reestablishes configuration/

video link if needed.

Configuration changed. Locks

to configuration/video link.

Sets Register 0x07 configuration bits in the serializer

(DBL, BWS, PXL_CRC, etc.). Wait 2ms.

Configuration changed.

Reestablishes config/video link

if needed

Loss of lock may occur.

Sets Register 0x07 configuration bits in the

deserializer (DBL, BWS, PXL_CRC, etc.). Wait 5ms

for lock to re-establish.

—

Configuration changed. Locks

to configuration/video link.

Writes rest of serializer/deserializer configuration bits. Configuration changed.

Configuration changed.

Writes camera/peripheral configuration bits.

Forwards commands from μC to

serializer.

Forwards commands to cam-

era/peripherals.

If in configuration link: When PCLK is available, set

SEREN = 1. Wait 5ms for lock.

Enables video link.

Locks to video link.

Table 2. Link-Startup Procedure

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Maxim Integrated │ 31

MAX96708

14-Bit GMSL Deserializer

with Coax or STP Cable Input

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