AR# 71876

描述

An executable which combines the C-model for the SD-FEC, LDPC Encoder/Decoder, or Polar Encoder/Decoder IP with other DSP IP C-models (for example, CORDIC) will crash with a run-time error.

The error message or signature will differ depending on the order the IP C-models are linked to the executable, and therefore will be loaded at run time.

In this example, the C-model for one of the other DSP IP (for example, CORDIC) is loaded/linked first:

The create call for the SD-FEC, LDPC Encoder/Decoder or Polar Encoder/Decoder models will fail with an uncaught error:

When the C-model for the SD-FEC, LDPC Encoder/Decoder or Polar Encoder/Decoder is loaded/linked first, the error signature is less well defined. 

It is likely be reported as an invalid pointer access by the glibc library:

解决方案

This is a known issue when running C model simulation with multiple DSP IPs. 

It will be fixed in Vivado 2019.1 and later versions.

SDFEC, LDPC, and Polar IPs use a newer version of GCC that supports C++11, which is not compatible with other DSP IP C models.

All users are recommended to upgrade to the latest Vivado version.

For Vivado 2018.3:

• SDFEC - You can use the SDFEC patch in (Xilinx Answer 71873) to work around the problem
• LDPC - You  can use the LDPC IP patch in (Xilinx Answer 71874) to work around the problem
• Polar - You can use the Polar IP patch in (Xilinx Answer 71875) to work around the problem   

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