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A write to the DRW register initiates a memory write transaction on the master. AP drives DRW write data on the data bus during the data phase of the current transfer. Reading the DRW register initiates a memory read transaction on the master. The resulting read data that is received from the memory system is returned on the slave interface.
The DRW register characteristics are:
The following figure shows the bit assignments.
The following table shows the bit assignments.
Table 9-94 DRW register bit assignments
Current transfer data value. In read mode, the register contains the data value that was read from the current transfer, and in write mode the register contains the data value to write for the current transfer.