6.1.1. Avalon® -MM Slave Read and Write Interfaces
The read data passes through without the controller registering it, as the PHY takes care of read latency. The write data goes through a pipeline stage to delay for a fixed number of cycles as specified by the write latency. In the full-rate burst length of four controller, the write data is also multiplexed into a burst of 2, which is then multiplexed again in the PHY to become a burst of 4 in DDR.
The user interface to the controller has separate read and write Avalon-MM interfaces because reads and writes are independent of each other in the memory device. The separate channels give efficient use of available bandwidth.
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