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AR# 6492

1.5i Virtex Map/PAR - Clock net LOC constraints may be ignored if IPAD to BUFG connection is used.

Description

For the following configuration:

IPAD------------------BUFG--------
NET_X

The .ucf NET constraint:

NET "NET_X" LOC=Y11 ;

is not handled successfully by the Map and PAR tools in version 1.5i.

Map incorrectly maps to a standard IOB rather than GCLKIOB and writes a
LOC constraint into the .pcf file for the GCLKIOB site. PAR incorrectly ignores
this invalid LOC constraint, so that there is no feedback to the user that the original
.ucf constraint was ignored.

解决方案

This problem is fixed in version 2.1i.

Meanwhile, the following configurations will work with the net constraint:

IPAD----------IBUFG-----------BUFG
NET_X

IPAD----------BUFGP
NET_X
AR# 6492
创建日期 05/13/1999
Last Updated 04/25/2000
状态 Archive
Type 综合文章