MAX96708 datasheet(61/68 Pages) MAXIM

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UART

Set I2CSEL = 0 to configure the control channel for UART

or UART to I2C. In this mode, the control channel for-

wards UART commands from the microcontroller side to

the other side of the GMSL link. When INTTYPE = 00, the

remote device acts as an I2C master to the other periph-

erals connected to the remote side device. UART-to-I2C

mode does not support devices that use clock stretching.

Base Mode

In base mode, UART packets control the serializer, dese-

rializer and attached peripherals.

UART Timing

In base mode, the UART idles high (through a pullup

resistor). Each GMSL-UART byte consists of a START

bit, 8 data bits, an even-parity bit and a stop bit (Figure

19). Keep the idle time between bytes of the same UART

packet to less than 4 bit times. The GMSL-UART protocol

is listed in Figure 20. A write packet consists of a SYNC

byte (Figure 21). Device address byte, Starting register

address byte, number of bytes to write, and the data

bytes. The slave device responds with an acknowledge

byte (Figure 22) if the write was successful. A Read pack-

et consists of a SYNC byte, Device address byte, Starting

slave device responds with an acknowledge byte and the

read data bytes.

Figure 21. SYNC Byte (0x79)

Figure 22. ACK Byte (0xC3)

Figure 19. GMSL-UART Data Format for Base Mode

Figure 20. GMSL-UART Protocol for Base Mode

START

PARITY STOP

START

PARITY STOP

START

PARITY*

STOP

1 UART FRAME

FRAME 1

FRAME 2

FRAME 3

*BASE MODE USES EVEN PARITY

START

STOP

START

STOP

WRITE DATA FORMAT

SYNC

REG ADDR NUMBER OF BYTES

SYNC

DEV ADDR + R/W REG ADDR NUMBER OF BYTES

BYTE 1

BYTE N

ACK

BYTE N

BYTE 1

ACK

MASTER READS FROM SLAVE

READ DATA FORMAT

MASTER WRITES TO SLAVE

MASTER READS FROM SLAVE

DEV ADDR + R/W

www.maximintegrated.com

Maxim Integrated │ 61

MAX96708

14-Bit GMSL Deserializer

with Coax or STP Cable Input

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