JAJSKM1C october 2019 – september 2021 UCC5870-Q1
PRODUCTION DATA
The SDI CRC checksum data is continuously calculated as SPI data frames are received. Once the MCU writes to the to CRCDATA[CRC_TX] bits (CRCDATA). The write to these bits triggers a comparison of the data in the CRC_TX bits with the internally calculated CRC. Once the comparison is complete, the CRC calculation logic is reset (reset value = 0xFF). When there is a mismatch between CRC_TX data and CRC calculated internally, the STATUS2[SPI_FAULT] bit (STATUS2) is and, if unmasked, the nFLT1 output pulls low. Additionally, the output of the driver is forced to the state programmed in CFG3[FS_STATE_SPI_FAULT] (CFG3).