MAX9268GCMSLASHV+T datasheet(24/35 Pages) MAXIM

24 / 35 page

Gigabit Multimedia Serial Link Deserializer

with LVDS System Interface

24 _____________________________________________________________________________________

Solve the above equation for SDIV using the desired pixel

clock and modulation frequencies. If the calculated SDIV

value is larger than the maximum allowed SDIV value in

Table 8, set SDIV to the maximum value.

Sleep Mode

The GMSL serializer/MAX9268 include low-power sleep

mode to reduce power consumption on the device not

attached to the FC (the MAX9268 in LCD applications and

the GMSL serializer in camera applications). Set the corre-

sponding remote IC’s SLEEP bit to 1 to initiate sleep mode.

The GMSL serializer sleeps immediately after setting its

SLEEP = 1. The MAX9268 sleeps after serial link inactivity

or 8ms (whichever arrives first) after setting its SLEEP = 1.

See the Link Startup Procedure section for details on wak-

ing up the device for different FC and starting conditions.

The FC side device cannot enter into sleep mode. If an

attempt is made to program the FC side device for sleep,

the SLEEP bit remains 0. Use the power-down mode to

bring the FC side device into a low-power state.

Power-Down Mode

The MAX9268 includes a power-down mode to further

reduce power consumption. Set PWDN low to enter power-

down mode. While in power-down mode, the outputs of

the device remain high impedance. Entering power-down

mode resets the internal registers of the device. In addition,

upon exiting power-down mode, the MAX9268 relatches

the state of SSEN, EQS, DRS, and ADD_.

Configuration Link Mode

The GMSL includes a low-speed configuration link to allow

control-data connection between the two devices in the

absence of a valid clock input. In either display or camera

applications, the configuration link can be used to program

equalizer/preemphasis or other registers before establish-

ing the video link. An internal oscillator provides a clock

for establishing the serial configuration link between the

GMSL serializer and the MAX9268. Set CLINKEN = 1 on

the GMSL serializer to turn on the configuration link. The

configuration link remains active as long as the video link

has not been enabled. The video link overrides the configu-

ration link and attempts to lock when SEREN = 1.

Link Startup Procedure

Table 9 lists four startup cases for video-display applica-

tions. Table 10 lists two startup cases for image-sensing

applications. In either video-display or image-sensing

applications, the control link is always available after the

high-speed data link or the configuration link is established

and the GMSL serializer/MAX9268 registers or peripherals

are ready for programming.

Video-Display Applications

For a video-display application with a remote display unit,

connect the FC to the GMSL serializer and set CDS = low

for both the GMSL serializer and the MAX9268. Table 9

summarizes the four startup cases based on the settings

of AUTOS and MS.

Case 1: Autostart Mode

After power-up or when PWDN transitions from low to

high for both the serializer and deserializer, the serial link

establishes whether a stable clock is present. The GMSL

serializer locks to the clock and sends the serial data to the

MAX9268. The MAX9268 then detects activity on the serial

link and locks to the input serial data.

Case 2: Standby Start Mode

After power-up or when PWDN transitions from low to high

for both the serializer and deserializer, the MAX9268 starts

up in sleep mode, and the GMSL serializer stays in standby

mode (does not send serial data). Use the FC and program

the serializer to set SEREN = 1 to establish a video link

or CLINKEN = 1 to establish the configuration link. After

locking to a stable clock (for SEREN = 1) or the internal

oscillator (for CLINKEN = 1), the serializer sends a wake-

up signal to the MAX9268. The MAX9268 exits sleep mode

after locking to the serial data and sets SLEEP = 0. If after

8ms the MAX9268 does not lock to the input serial data, the

deserializer goes back to sleep and the internal sleep bit

remains set (SLEEP = 1).

Case 3: Remote Side Autostart Mode

After power-up or when PWDN transitions from low to

high, the remote device (MAX9268) starts up and tries to

lock to an incoming serial signal with sufficient power. The

host side (GMSL serializer) is in standby mode and does

not try to establish a link. Use the FC and program the

serializer to set SEREN = 1 (and apply a stable clock signal)

to establish a video link, or CLINKEN = 1 to establish the

configuration link. In this case, the MAX9268 ignores the

short wake-up signal sent from the GMSL serializer.

Case 4: Remote Side in Sleep Mode

After power-up or when PWDN transitions from low to high,

the remote device (MAX9268) starts up in sleep mode.

The high-speed link establishes automatically after the

GMSL serializer powers up with a stable clock signal and

sends a wake-up signal to the MAX9268. Use this mode in

applications where the MAX9268 powers up before the

GMSL serializer.

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