Read and Write Request Formats

Request Data Structure

Bytes

Name

Description

1

LUN

Bit0-Bit3=0 indicates local.

Bit0-Bit3=(1-15) indicates the index of the MINI management chip.

Bit7=1 indicates the last frame.

Bit7=0 indicates that data writing is not complete.

2

arg

Supplementary parameter of opcode.

3 ~ 4

opcode

Command word. For details, see the Data Register Key Definition definition.

5~8

offset

Data read offset. It starts from 0 and needs to be read multiple times for long data. For example, if the first read is 0 and the read length is 32, the offset is 32 during the second read.

9 ~ 12

length

Length of the requested data.

• Read:

  Read data length. If the total length of the opcode data defined in this specification is longer, the data read length of each request is (32-12) bytes. If the total data length of the opcode defined in this specification is fixed, the data read length of other frames except the last frame request must be (32-12) bytes.

• Write:

  Write data length. No matter when the total length of the opcode data defined in this specification is longer or fixed, except the last frame request (if there is only one frame, the first frame is the last frame), the read data length of other frames must be (32-12) bytes.

13 ~ N

data

Data area.