Why do I get a fitter compilation error (Error 169285) when I use the Generic Serial Flash Interface IP in my design? - Why do I get a fitter compilation error (Error 169285) when I use the Generic Serial Flash Interface IP in my design? Description When compiling a design with the Generic Serial Flash Interface IP , the following error may occur: Error(169285): Too many input or bidirectional pins (17) are assigned in I/O bank 3A. This error does not appear if the Generic Serial Flash Interface IP is removed. The pin-out file shows exactly 16 user I/Os for Bank 3A, but the error reports 17 pins . The issue is triggered when using the following Quartus.ini assignment: fiomgr_enable_spi_timing=on With this setting enabled, the Fitter counts both 16 user I/Os and 10 dedicated configuration pins in Bank 3A. Because the Fitter rule allows a maximum of 16 user I/Os , the additional visibility of the 10 configuration pins causes the rule check to fail, resulting in the error. Resolution This problem is fixed starting with Quartus® Prime Standard Edition Software version 24.1 . For earlier versions, a patch is available: Quartus® Prime Standard Edition v20.1.1 → Patch 1.12std If you require this patch, please contact Premier Support to request access. Custom Fields values: ['novalue'] Troubleshooting 15016484995 False ['Generic Serial Flash Interface IP'] ['FPGA Dev Tools Quartus® Prime Software Standard'] 24.1 20.1.1 ['Cyclone® IV FPGAs', 'Cyclone® V FPGAs and SoCs', 'Cyclone® 10 LP FPGA'] ['novalue'] ['novalue'] ['novalue']