The first 16 bits indicate the
error count for the first data beat (i.e. the data
driven out on DDR_D[7:0] on the rising edge of
DDR_DQS). The second 16 bits indicate the error on
the second data beat (i.e. the error count of the
data driven out on DDR_D[7:0] on the falling edge
of DDR_DQS). For each of the 16-bit group, the
first 2 bits are for DDR_D0, the second for
DDR_D1, and so on.
The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.