The MCAP Write Data Register is used to provide data that will used for the AXI transactions that will be generated to the NOC infrastructure. The MCAP will generate 32-bit write transactions to the NOC infrastructure when the MCAP 128-bit Mode is set to zero and 128-bit NOC transactions when the MCAP Mode bit is set to 1. For 128-bit transactions the data from 4 MCAP Write Data Registers will be coalesced into a single 128-bit AXI transaction.