Article ID: 000076967 Content Type: Troubleshooting Last Reviewed: 09/11/2012

Why do I not read back the correct value from my PIO core generated by SOPC Builder?

Environment

  • Quartus® II Subscription Edition
  • BUILT IN - ARTICLE INTRO SECOND COMPONENT
    Description

    An issue has been identified that affects the generation of PIO cores with input ports of less than 8 bits. This issue only occurs when the project is configured for VHDL.

    The issue results in the top bit of the first data byte for read being tied to logic 1.

    To work around this issue, the user should mask the top bit of the first byte of the PIO in software when performing a read.

    This issue shall be addressed in a later version of the Quartus® II tool.

    Related Products

    This article applies to 1 products

    Intel® Programmable Devices