48SWTQFN-EP datasheet(61/103 Pages) MAXIM

61 / 103 page

MAX9288/MAX9290

3.12Gbps GMSL Deserializers

for Coax or STP Input and MIPI CSI-2 Output

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As shown in Figure 45, the remote-side device converts

packets going to or coming from the peripherals from

UART format to I2C format and vice versa. The remote

device removes the byte number count and adds or

receives the ACK between the data bytes of I2C. The I2C

bit rate is the same as the UART bit rate.

Interfacing Command-Byte-Only I2C Devices

with UART

The deserializers’ UART-to-I2C conversion can interface

with devices that do not require register addresses, such

as the MAX7324 GPIO expander. In this mode, the I2C

master ignores the register address byte and directly reads/

writes the subsequent data bytes (Figure 46). Change

the communication method of the I2C master using the

I2CMETHOD bit. I2CMETHOD = 1 sets command-byte-

only mode, while I2CMETHOD = 0 sets normal mode where

the first byte in the data stream is the register address.

UART Bypass Mode

In bypass mode, the deserializers ignore UART commands

from the µC and the µC communicates with the peripher-

als directly using its own defined UART protocol. The µC

cannot access the serializer/deserializer’s registers in this

mode. Peripherals accessed through the forward control

channel using the UART interface need to handle at least

one pixel clock period ±10ns of jitter due to the asynchro-

nous sampling of the UART signal by pixel clock. Set MS =

high in the serializer to put the control channel into bypass

mode. For applications with the µC connected to the dese-

rializer, set the MS pin on the deserializer. There is a 1ms

wait time between switching MS and the bypass control

channel being active; do not send a UART command

during this time. There is no delay time when switching

to bypass mode when the µC is connected to the serial-

izer. Although MS on either the serializer or deserializer

sets the control-channel byass mode, only the local-side

device (connected to the µC) should be used set bypass

mode, Do not switch MS while a UART command is being

sent. Do not send a logic-low value longer than 100µs to

ensure proper GPO functionality. Bypass mode accepts

bit rates down to 10kbps in either direction. See the

GPO/GPI Control section for GPI functionality limitations.

The control-channel data pattern should not be held low

longer than 100µs if GPI control is used.

Figure 45. Format Conversion Between GMSL UART and I2C with Register Address (I2CMETHOD = 0)

SYNC FRAME

DEVICE ID + WR

DATA 0

DEV ID

DATA N

ACK FRAME

: MASTER TO SLAVE

SERIALIZER/DESERIALIZER

PERIPHERAL

REG ADDR

SYNC FRAME

DEVICE ID + RD

ACK FRAME

DATA 0

DATA N

UART-TO-I2C CONVERSION OF WRITE PACKET (I2CMETHOD = 0)

UART-TO-I2C CONVERSION OF READ PACKET (I2CMETHOD = 0)

S: START

P: STOP

A: ACKNOWLEDGE

: SLAVE TO MASTER

DATA 0

DATA N

A P

DEV ID

DATA N

DATA 0

REG ADDR

µC

SERIALIZER/DESERIALIZER

µC

SERIALIZER/DESERIALIZER

PERIPHERAL

48SWTQFN-EP Datasheet(PDF) 61 Page - Maxim Integrated Products

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