Description
An issue has been identified where the EPCS controller in Qsys does not work correctly when sourced from a clock with a frequency greater than 50 MHz. This issue only affects Qsys systems, and is not an issue in SOPC Builder.
Resolution
This issue has been fixed in Qsys versions 12.0 and later. To work around this issue in earlier versions of the tool, ensure that the EPCS controller is fed with a clock of 50 MHz or slower.