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26 _____________________________________________________________________________________

MAX9249

Gigabit Multimedia Serial Link

Serializer with LVDS System Interface

Case 2: Standby Start Mode

After power-up or when PWDN transitions from low to

high for both the serializer and deserializer, the GMSL

deserializer starts up in sleep mode, and the MAX9249

stays in standby mode (does not send serial data). Use

the FC and program the MAX9249 to set SEREN = 1 to

establish a video link or CLINKEN = 1 to establish the

configuration link. After locking to a stable RXCLKIN_ (for

SEREN = 1) or the internal oscillator (for CLINKEN = 1),

the MAX9249 sends a wake-up signal to the deserializer.

The GMSL deserializer exits sleep mode after locking to

the serial data and sets SLEEP = 0. If after 8ms the dese-

rializer does not lock to the input serial data, the GMSL

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 (GMSL deserializer) starts

up and tries to lock to an incoming serial signal with

sufficient power. The host side (MAX9249) is in standby

mode and does not try to establish a link. Use the FC and

program the MAX9249 to set SEREN = 1 (and apply a

stable RXCLKIN_) to establish a video link or CLINKEN

= 1 to establish the configuration link. In this case, the

GMSL deserializer ignores the short wake-up signal sent

from MAX9249.

Figure 23. State Diagram, CDS = Low (LCD Application)

Table 9. Startup Selection for Image-Sensing Applications (CDS = High)

POWER-DOWN

OR POWER-OFF

POWER-ON

IDLE

CONFIG LINK

OPERATING

ALL STATES

VIDEO

LINK LOCKING

VIDEO LINK

UNLOCKED

AUTOS PIN

SETTING

LOW

HIGH

SEREN BIT

POWER-UP VALUE

PWDN = LOW OR

POWER-OFF

SEREN = 1,

RXCLKIN_ RUNNING

SEREN = 0, OR

NO RXCLKIN_

SEREN = 0,

NO RXCLKIN_

PWDN = HIGH

POWER-ON,

AUTOS = LOW

CONFIG

LINK STARTING

PROGRAM

REGISTERS

VIDEO LINK

OPERATING

PRBSEN = 0

PRBSEN = 1

VIDEO LINK

PRBS TEST

CLINKEN = 0 OR

SEREN = 1

CLINKEN = 1

CLINKEN = 0 OR

SEREN = 1

CONFIG LINK

UNLOCKED

VIDEO LINK

LOCKED

CONFIG LINK

PWDN = HIGH,

POWER-ON

AUTOS = LOW

CASE

AUTOS

(MAX9249)

MAX9249 POWER-UP

STATE

GMSL DESERIALIZER

POWER-UP STATE

LINK STARTUP MODE

1 Low Serialization enabled

Normal

(SLEEP = 0)

Autostart

2 High

Sleep mode

(SLEEP = 1)

Normal

(SLEEP = 0)

MAX9249 is in sleep mode. Wake up the

MAX9249 through the control channel (FC

attached to the GMSL deserializer).

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