126.96.36.199.1. Configuration Error Detection
When the Intel® Quartus® Prime software generates the configuration bitstream, the software also computes a 32-bit CRC value for each CRAM frame. A configuration bitstream contains one CRC value for each data frames. The length of the data frame can vary for each device.
As each data frame is loaded into the FPGA during configuration, the precomputed CRC value shifts into the CRC circuitry. At the same time, the CRC engine in the FPGA computes the CRC value for the data frame and compares it against the precomputed CRC value. If both CRC values do not match, the nSTATUS pin is set to low to indicate a configuration error.