Critical Issue
In the 10GBASE-R PHY IP core version 10.1 and earlier, the TX_FIFO_FULL and RX_FIFO_FULL status bits are swapped.
Affected Configurations
This issue affects Stratix® IV and Stratix V implementations of the 10GBASE-R PHY.
Solution Status
This issue is fixed in the 10GBASE-R PHY IP core version 11.0.
The workaround is to note that for the 10.1 and earlier release RX_FIFO_FULL is actually stored as bit 3 of address 0x82 and TX_FIFO_FULL is stored as bit 4 of address 0x82.