AR# 58579

LogiCORE FIR Compiler v5.0 - Why do I see a glitch on the output after a coefficient reload, when using the DA FIR implementation?

Description

Why do I see a glitch on the output after a coefficient reload, when using the DA FIR implementation?

Solution

This is a known issue that can happen under particular timing scenarios.

The following options are available to work around this issue:
  •  Tolerate the glitch as the core will recover.
  •  Ensure that the FILTER_SEL value is different to the COEF_FILTER_SEL value during and immediately following a reload.
  •  Do not select ND
  •  If ND is used, ensure that the core is run at its maximum input rate during reload or de-assert ND during reload.

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
29138 LogiCORE IP Finite Impulse Response Compiler (FIR Compiler) - Release Notes and Known Issues N/A N/A
AR# 58579
Date 03/02/2015
Status Active
Type General Article
IP