48SWTQFN-EP datasheet(60/103 Pages) MAXIM

60 / 103 page

MAX9288/MAX9290

3.12Gbps GMSL Deserializers

for Coax or STP Input and MIPI CSI-2 Output

www.maximintegrated.com

Maxim Integrated │ 60

Figure 41 shows the UART protocol for writing and reading

in base mode between the µC and the serializer/deserializer.

Figure 42 shows the UART data format. Even parity is

used. Figure 43 and Figure 44 detail the formats of the

SYNC byte (0x79) and the ACK byte (0xC3). The µC and

the connected slave chip generate the SYNC byte and

ACK byte, respectively. Events such as device wake-up

and GPI generate transitions on the control channel that

can be ignored by the µC. Data written to the deserial-

izer registers do not take effect until after the ACK 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 communication, or if a line fault occurs,

the control-channel communication is 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

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

starting to send a new packet.

Figure 41. GMSL UART Protocol for Base Mode

Figure 42. GMSL UART Data Format for Base Mode

Figure 43. SYNC Byte (0x79)

Figure 44. ACK Byte (0xC3)

WRITE DATA FORMAT

SYNC

DEV ADDR + R/W 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

START

PARITY

STOP

1 UART FRAME

FRAME 1

FRAME 2

FRAME 3

STOP

START

STOP

START

PARITYSTOP

START

PARITY STOP

48SWTQFN-EP Datasheet(PDF) 60 Page - Maxim Integrated Products

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