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FISE 3.1 - ABEL-XST flow may create incorrect logic for bi-directional pins.
Keywords: ABEL, XST, tri-state, 3-state, bi-directional, pin feedback
In cases where the input of a bi-directional port drives another output pin, the
ABEL-XST flow can create incorrect logic.
IO_A, IN_A, OUT_ENABLE, OUT_B pin;
IO_A = IN_A;
IO_A.oe = OUT_ENABLE;
OUT_B = IO_A.pin;
If you have a pin configuration in your design similar to the description above, you
should use the ABEL-BLIF flow for the Foundation ISE 3.x release.
The above signal configuration will compile and implement correctly using the
This ABEL-XST problem will be corrected in the next major software release.
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