1.8.1. Shadow Registers Operation
The afi_wrank signal indicates the rank to which the controller is writing, so that the PHY can switch to the appropriate setting. Signal timing is identical to afi_dqs_burst; that is, afi_wrank must be asserted at the same time as afi_dqs_burst, and must be of the same duration.
The afi_rrank signal indicates the rank from which the controller is reading, so that the PHY can switch to the appropriate setting. This signal must be asserted at the same time as afi_rdata_en when issuing a read command, and once asserted, must remain unchanged until the controller issues a new read command to another rank.
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