MAX9272 28-Bit GMSL Deserializer for Coax or STP Cable

MAX9272
28-Bit GMSL Deserializer for Coax or STP Cable
ADDRESS = 0x80
0 = WRITE
REGISTER ADDRESS = 0x00
S
1 0 0 0
0 0 0 0 A
0 0 0 0
0 0 0 0 A
REPEATED START
ADDRESS = 0x81
1 = READ
REGISTER 0x00 READ DATA
S = START BIT
P = STOP BIT
A = ACK
N = NACK
D_ = DATA BIT
S
1 0 0 0
0 0 0 0 A D7 D6 D5 D4 D3 D2 D1 D0 N P
Figure 28. Format for I 2 C Read
Table 4. I2C Bit-Rate Ranges
LOCAL BIT RATE REMOTE BIT-RATE RANGE I2CMSTBT SETTING
f > 50kbps Up to 1Mbps Any
20kbps > f > 50kbps Up to 400kbps Up to 110
f < 20kbps Up to 10kbps 000
I 2 C Communication with Remote-Side Devices
The deserializer supports I 2 C communication with a
peripheral on the remote side of the communication link
using SCL clock stretching. While multiple masters can
reside on either side of the communication link, arbitration
is not provided. The connected masters need to support
SCL clock stretching. The remote-side I 2 C bit-rate
range must be set according to the local-side I 2 C bit rate.
Supported remote-side bit rates can be found in Table 4.
Set the I2CMSTBT (register 0x0D) to set the remote I 2 C bit
rate. If using a bit rate different than 400kbps, local- and
remote-side I 2 C setup and hold times should be adjusted
by setting the SLV_SH register settings on both sides.
I 2 C Address Translation
The deserializer supports I 2 C address translation for
up to two device addresses. Use address translation
to assign unique device addresses to peripherals with
limited I 2 C addresses. Source addresses (address to
translate from) are stored in registers 0x09 and 0x0B.
Destination addresses (address to translate to) are
stored in registers 0x0A and 0x0C.
Control-Channel Broadcast Mode
The deserializer supports broadcast commands to control
multiple peripheral devices. Select an unused device
address to use as a broadcast device address. Program
the remote-side GMSL device to translate the broadcast
device address (source address stored in registers 0x09,
0x0B) to the peripheral device address (destination
address stored in registers 0x0A, 0x0C). Any commands
sent to the broadcast address are sent to all designated
peripherals, while commands sent to a peripheral’s unique
device address are sent to that particular device only.
GPO /GPI Control
GPO on the serializer follows GPI transitions on the
deserializer. This GPO/GPI function can be used to
transmit signals such as frame sync in a surround-view
camera system. The GPI-to-GPO delay is 0.35ms (max).
Keep the time between GPI transitions to a minimun
0.35ms. This includes transitions from the other deserializer
in coax-splitter mode. Bit D4 of register 0x0E in
the deserializer stores the GPI input state. GPO is low
after power-up. The FC can set GPO by writing to the
serializer SET_GPO register bit. Do not send a logic-low
value on the deserializer RX/SDA input (UART mode)
longer than 100Fs in either base or bypass mode to
ensure proper GPO/GPI functionality.
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