AR# 71874


LDPC Encoder/Decoder v2.0 (Rev 2) - Patch Updates for LDPC Encoder/Decoder v2.0 release in Vivado 2018.3


This answer record contains information on the necessary patch updates for the LDPC Encoder/Decoder IP v2.0 in Vivado 2018.3.

It will not be needed in Vivado 2019.1 and later versions.


Fixed Issue:

(Xilinx Answer 71824) Simulation only example design generates incorrect stimulus on Windows OS
(Xilinx Answer 71876) Executable crash when the SD-FEC, LDPC Encoder/Decoder or Polar Encoder/Decoder C-models are combined with other DSP IP C-models

METHOD 1: (Vivado 2014.4 and later only)

  1. Navigate to the $XILINX_VIVADO/patches directory (Linux) or C:\Xilinx\Vivado\<vivado_version>\patches (Windows) directory (create this directory if it does not exist)
  2. Extract the contents of the ".zip" archive to a directory starting with the name AR71874
    Note: most extraction tools will allow you to automatically create a directory with the same name as the zip file
  3. Run Vivado software tools from the original install location.


  1. Creating a separate directory containing patched files
  2. Extract the contents of the ".zip" archive to the desired patch directory location.
  3. Set the XILINX_PATH environment variable to point to this patch directory
     i.e. set XILINX_PATH=C:\XILINX_PATH\vivado-patch-AR71874\vivado\
  4. Run Vivado software tools from the original install location.


For other known issues with LDPC Encoder/Decoder, see (Xilinx Answer 69399)


Associated Attachments

Name File Size File Type 9 MB ZIP

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
69399 LDPC Encoder/Decoder - Release Notes and Known Issues for Vivado 2017.3 and newer tool versions Article N/A N/A

Child Answer Records

Associated Answer Records

AR# 71874
Date 01/16/2019
Status Active
Type General Article
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