LRI1K datasheet(30/86 Pages) STMICROELECTRONICS

30 / 86 page

Data storage format identifier (DSFID)

LRI1K

30/86

Doc ID 17170 Rev 3

Data storage format identifier (DSFID)

The data storage format identifier indicates how the data is structured in the LRI1K memory.

The logical organization of data can be known instantly using the DSFID.

It can be programmed and locked using the Write DSFID and Lock DSFID commands,

respectively. It is coded on one byte.

9.1

CRC

The CRC used in the LRI1K is calculated as per the definition in ISO/IEC 13239.

The initial register contents are all ones: "FFFF".

The two-byte CRC is appended to each request and response, within each frame, before

the EOF. The CRC is calculated on all the bytes between the SOF and the CRC field.

Upon reception of a request from the VCD, the LRI1K verifies that the CRC value is valid. If

it is invalid, the LRI1K discards the frame and does not answer to the VCD.

Upon reception of a response from the LRI1K, it is recommended that the VCD verifies

whether the CRC value is valid. If it is invalid, actions to be performed are left to the

discretion of the VCD designers.

The CRC is transmitted least significant byte first.

Each byte is transmitted least significant bit first.

Table 6.

CRC transmission rules

LSByte

MSByte

LSBit

MSBit LSBit

MSBit

CRC 16 (8bits)

CRC 16 (8 bits)

LRI1K 数据表(PDF) 30 Page - STMicroelectronics