Hi Everyone,
I would be really for any help or advice you can offer me on the following.
I have created a simple tri-state bus as a macro using xdl. The design consists of two TBUFs driving a single long line.
(Diagram at
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I attach external macro pins to Out, Enable and In of each TBUF. However, when I try to include the macro in a design, the DRC in the map phase complains that the Out pin is being driven by two sources. MAP Error Message:
ERROR:MapLib:22 - Bus M0_DATA_LEFT_O_OBUF driven by bm_instance and bm_instance has multiple active drivers.
This is not correct, as the O pins are external macro outputs! Is there anyway to prevent this?
Xilinx don't list any help for this Error.
/Ian.