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AR# 10644

3.3i Foundation ISE Project Importer - I/O macros are not recognized by FPGA Express.


Keywords: ISE, Project Navigator, Importer

Urgency: Standard

General Description:
On designs imported from the Foundation schematic to ISE, Synopsys is
inserting IBUFs in front of IFD symbols for Virtex-derived families. This is
causing the implementation tools to error out.

This does not appear to happen for 4K families.


Solution 1:
In Foundation Schematic, change the IFD to an FD, and add an IBUF on
the data input to the FD. Then, set the "Pack I/O Registers/Latches Into
IOBs" option to "For Inputs And Outputs" under the Map - Properties of ISE.

Solution 2:
"Insert I/O Buffers" must be de-selected in FPGA Express, and all IBUFs and
OBUFs must be instantiated.
AR# 10644
Date Created 12/14/2000
Last Updated 10/21/2002
Status Archive
Type General Article