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4.1i 4000E MAP - MAP incorrectly trims OUTFFTs that are permanently active.
Keywords: XNF, OUTFFT trimmed.
Pins attached to an OUTFFT with the T tied low (on) in an .xnf file are being trimmed. I cannot simply use OUTFFs, because the design may really be toggling T of OUTFFT.
You can work around this problem by placing a "nomerge" attribute on the TBUF control net. This can be done in the .ucf file:
NET "netname" KEEP ;