Stratix V Device Handbook: Volume 2: Transceivers

ID 683779
Date 11/23/2021
Public
Document Table of Contents

1.4.2.7.1. Transmitter Inversion

The PRBS pattern generator can dynamically invert the data pattern that leaves the PCS block.
Table 13.  PRBS Generator Inversion Offset
Offset Bits R/W Name Description
0x141 [0] R/W TX Inversion Set to 1'b1 to invert the data leaving the PCS block.

To invert the PRBS pattern leaving the PRBS generator:

  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 [0] of offset 0x141.
  4. Assert the channel reset to begin testing on the new PRBS pattern.

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

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