Article ID: 000077932 Content Type: Troubleshooting Last Reviewed: 09/11/2012

Why do I receive a "Can't place input pin" or "Cannot place I/O" compilation error after applying my GXB pin location assignments when no ALTGXB megafunction exists in my design?



You may see the following compilation errors in the Quartus® II software, if you make pin assignments to your dedicated GXB pins without instantiating and fully connecting the ALTGXB megafunction in your design:

For inputs:
Error: Can't place input pin <pin name> in <pin location> because the pin is not connected to GXB Transceiver logic but the location is GXB Receiver pin.

For outputs:
Error: Cannot place I/O <pin name> in <pin location> because the I/O is not connected to GXB transmitter.

To avoid these errors, follow these steps: 

  1. Instantiate the ALTGXB megafunction in your design.
  2. Ensure that all megafunction ports are fully connected.
  3. Apply the Virtual Pin assignment to any internal or core-side signals that should not connect to device I/O pins.

Related Products

This article applies to 5 products

Stratix® IV GT FPGA
Stratix® IV GX FPGA
Stratix® IV E FPGA
Stratix® GX FPGA
Stratix® II GX FPGA



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