Nios II Ports Created Incorrectly

Description

A threading issue between SOPC Builder and the Nios II MegaWizard™ interface occasionally causes HDL file analysis to fail. This creates all ports as std_logic input with width 1.

This issue affects Nios II processor systems with custom instructions.

Design fails to run in ModelSim^®.

Resolution

After adding your custom instruction, close and relaunch SOPC Builder.