3.5.4. Direct Interface CPRI Frame Data Format
The information on the AUX interface and all of the other direct interfaces except the L1 CSR interface, appears in the relevant data bus in 32-bit words. The CPRI Intel® FPGA IP converts the contents of the incoming CPRI frame to a 32-bit format internally. Similarly, the IP core expects to receive data on the various direct interfaces in this format. The only exception is the L1 CSR interface, which transmits and receives information in individual bits.
The CPRI IP core passes the incoming AUX data through to the CPRI link unmodified. You must ensure that the incoming AUX data bits already include any CRC values expected by the application at the other end of the CPRI link.
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