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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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LRI2K Datasheet(PDF) 29 Page - STMicroelectronics |
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LRI2K Datasheet(HTML) 29 Page - STMicroelectronics |
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29 / 89 page  LRI2K Data storage format identifier (DSFID) 29/89 9 Data storage format identifier (DSFID) The Data Storage Format IDentifier indicates how the data is structured in the LRI2K 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 LRI2K 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 LRI2K verifies that the CRC value is valid. If it is invalid, the LRI2K discards the frame and does not answer to the VCD. Upon reception of a response from the LRI2K, 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) |
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