MAX9260 Maxim, MAX9260 Datasheet - Page 35

• Manufacturer Part Number: MAX9260
• Description: The MAX9259/MAX9260 chipset presents Maxim's gigabit multimedia serial link (GMSL) technology
• Manufacturer: Maxim

To program the SDIV setting, first look up the modulation
coefficient according to the part number and desired
bit-width and spread-spectrum settings. Solve the above
equation for SDIV using the desired parallel clock and
modulation frequencies. If the calculated SDIV value is
larger than the maximum allowed SDIV value in Tables
11 or 12, set SDIV to the maximum value.
The serializer/deserializer include a low-power sleep
mode to reduce power consumption on the device not
attached to the FC (MAX9260 in LCD applications and
MAX9259 in camera applications). Set the correspond-
ing remote IC’s SLEEP bit to 1 to initiate sleep mode. The
MAX9259 sleeps immediately after setting its SLEEP =
1. The MAX9260 sleeps after serial link inactivity or 8ms
(whichever arrives first) after setting its SLEEP = 1. See
the Link Startup Procedure section for details on waking
up the device for different FC and starting conditions.
The FC side device cannot enter into sleep mode, and its
SLEEP bit remains at 0. Use the PWDN input pin to bring
the FC side device into a low-power state.
The MAX9259/MAX9260 include a low-speed configura-
tion link to allow control-data connection between the two
devices in the absence of a valid parallel clock input. In
either display or camera applications, the configuration
link can be used to program equalizer/preemphasis
or other registers before establishing the video link.
An internal oscillator provides PCLK_ for establishing
the serial configuration link between the MAX9259 and
MAX9260. The parallel output clock and data lines are
disabled in the MAX9260. The LOCK output remains
low even after a successful configuration link lock. Set
CLINKEN = 1 on the MAX9259 to turn on the configura-
tion link. The configuration link remains active as long as
the video link has not been enabled. The video link over-
rides the configuration link and attempts to lock when
SEREN = 1.
Table 13 lists four startup cases for video-display
applications. Table 14 lists two startup cases for image-
sensing applications. In either 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 MAX9259/MAX9260 registers or the
peripherals are ready for programming.
Gigabit Multimedia Serial Link with Spread
Spectrum and Full-Duplex Control Channel
______________________________________________________________________________________
Link Startup Procedure
Configuration Link Mode
Sleep Mode
For the video-display application, with a remote display
unit, connect the FC to the serializer (MAX9259) and set
CDS = low for both the MAX9259 and MAX9260. Table
13 summarizes the four startup cases based on the set-
tings 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 if a stable PCLK_ is present. The
MAX9259 locks to PCLK_ and sends the serial data to
the MAX9260. The MAX9260 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
MAX9260 starts up in sleep mode, and the MAX9259
stays in standby mode (does not send serial data). Use
the FC and program the MAX9259 to set SEREN = 1 to
establish a video link or CLINKEN = 1 to establish the
configuration link. After locking to a stable PCLK_ (for
SEREN = 1) or the internal oscillator (for CLINKEN = 1),
the MAX9259 sends a wake-up signal to the deserial-
izer. The MAX9260 exits sleep mode after locking to the
serial data and sets SLEEP = 0. If after 8ms the deserial-
izer does not lock to the input serial data, the MAX9260
goes back to sleep, and the internal sleep bit remains
uncleared (SLEEP = 1).
After power-up, or when PWDN transitions from low to
high, the remote device (MAX9260) starts up and tries
to lock to an incoming serial signal with sufficient power.
The host side (MAX9259) is in standby mode and does
not try to establish a link. Use the FC and program the
MAX9259 to set SEREN = 1 (and apply a stable PCLK_)
to establish a video link, or CLINKEN = 1 to establish the
configuration link. In this case, the MAX9260 ignores the
short wake-up signal sent from the MAX9259.
After power-up or when PWDN transitions from low to
high, the remote device (MAX9260) starts up in sleep
mode. The high-speed link establishes automatically
after MAX9259 powers up with a stable PCLK_ and
sends a wake-up signal to the MAX9260. Use this mode
in applications where the MAX9260 powers up before
the MAX9259.
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
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