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wake-up and GPI generate transitions on the control

channel that can be ignored by the µC. Data written to

the serializer registers do not take effect until after the

acknowledge byte is sent. This allows the µC to verify

that write commands are received without error, even if

the result of the write command directly affects the serial

link. The slave uses the SYNC byte to synchronize with

the host UART’s data rate. If the GPI or MS inputs of the

deserializer toggle while there is control-channel com-

munication, or if a line fault occurs, the control-channel

communication will be corrupted. In the event of a missed

or delayed acknowledge (~1ms due to control-channel

timeout), the µC should assume there was an error in

the packet transmission or response. In base mode,

the µC must keep the UART Tx/Rx lines high no more

than four bit times between bytes in a packet. Keep

UART Tx/Rx lines high for at least 16 bit times before

starting to send a new packet.

As shown in Figure 25, 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 serializers’ 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 26). 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 serializers ignore UART

commands from the µC and the µC communicates with the

peripherals directly using its own defined UART

protocol. The µC cannot access the serializer/deseri-

alizer’s registers in this mode. Peripherals accessed

through the forward control channel using the UART

interface need to handle at least one RXC_ period

±10ns of jitter due to the asynchronous sampling of

the UART signal by RXC_. Set MS = high in the serial-

izer to put the control channel into bypass mode. For

applications with the µC connected to the deserializer,

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

wait time between switching MS and the bypass con-

Figure 26. Format Conversion Between GMSL UART and I2C without Register Address (I2CMETHOD = 1)

MASTER TO SLAVE

SERIALIZER/DESERIALIZER

UART-TO-I2C CONVERSION OF READ PACKET (I2CMETHOD = 1)

UART-TO-I2C CONVERSION OF WRITE PACKET (I2CMETHOD = 1)

µC

SERIALIZER/DESERIALIZER

µC

SYNC FRAME

DEVICE ID + RD

SYNC FRAME

DEVICE ID + WR

DATA 0

DATA N

ACK FRAME

DATA 0

DATA N

DATA 0

W A

DEV ID

A P

PERIPHERAL

1 1

DEV ID R A

A P

DATA 0

DATA N

SLAVE TO MASTER

S: START

P: STOP

A: ACKNOWLEDGE

MAX9291/MAX9293

3.12Gbps GMSL Serializers

for Coax or STP Output and HDMI Input

www.maximintegrated.com

Maxim Integrated │ 39

MAX9293 Datasheet(PDF) 39 Page - Maxim Integrated Products

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