The word format is designed to closely manage the flow of RX and TX data. Receive data is always via the RXFIFO. Transmit data can be written via the 32-bit TXFIFO or the 8-bit immediate data field in the command word.
Software writes the controller commands to the Cmd_FIFO_Data register. They are buffered in the 32-word deep command FIFO. The command word fields are described in the following table.
Multipurpose field for data or byte count
Select [IMM_DATA] field usage:
Note: Read data is always received via the RXD data port (RXFIFO).
Select byte count calculation method:
00: Reserved, do not use
Lower chip select control:
Upper chip select control:
Data bus enables for clocking:
Transmit data enable:
Receive data enable:
Data stripe enable:
RX data polling enable