Stratix V Device Handbook: Volume 2: Transceivers

ID 683779
Date 11/23/2021
Document Table of Contents Receiver Inversion

The PRBS pattern verifier can dynamically invert the data pattern that enters the PCS block.
Table 10.  PRBS Verifier Inversion Offset
Offset Bits R/W Name Description
0x16D [2] R/W RX Inversion Set to 1'b1 to invert the data entering the PCS block.

To invert the PRBS pattern entering the PRBS verifier:

  1. Select the logical channel. In this case, logical channel 0.
  2. Set the MIF streaming mode to 1.
  3. Perform a read-modify-write to bit [2] of offset 0x16D.
  4. Assert the channel reset to begin testing on the new PRBS pattern.

The inversion bit on the RX should be disabled to prevent normal data traffic from being inverted while entering the PCS.