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AR# 11122

3.1i Virtex-II MAP - "ERROR:MapLib:289 - DCM symbol..." (Overly restrictive DCM DRC rule)


Keywords: DCM, DRC, ERROR:MapLib:289,

Urgency: Standard

General Description:
The MAP DRC issues the following error message:

ERROR:MapLib:289 - DCM symbol "i_DCM" (output signal=clk_84)
CLKFB is driven by an input buffer, but neither CLK0, CLK2X or CLKFX of the DCM is driving loads off-chip."

(In fact, the connectivity in the design is legal, if somewhat unconventional.) The DRC check has been modified to allow FDDR/DCM connectivity.


This problem is fixed in the latest 3.1i Service Pack, available at:
The first service pack containing the fix is 3.1i Service Pack 8.
AR# 11122
Date Created 03/04/2001
Last Updated 08/19/2002
Status Archive
Type General Article