MAX9268 Maxim, MAX9268 Datasheet - Page 24

• Manufacturer Part Number: MAX9268
• Description: The MAX9268 deserializer utilizes Maxim's gigabit multimedia serial link (GMSL) technology
• Manufacturer: Maxim

Gigabit Multimedia Serial Link Deserializer
with LVDS System Interface
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.
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.
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_.
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.
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
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Link Startup Procedure
Configuration Link Mode
Power-Down Mode
Sleep Mode
and the GMSL serializer/MAX9268 registers or peripherals
are ready for programming.
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.
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.
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).
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.
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.
Case 3: Remote Side Autostart Mode
Case 4: Remote Side in Sleep Mode
Video-Display Applications
Case 2: Standby Start Mode
Case 1: Autostart Mode