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AR# 15298

4.2i XST - If the "maxdelay" constraint is used in a CST file or as an attribute, a message reports: "WARNING:Xst:37 - Unknown property 'maxdelay'"

Description

Keywords: XST, WARNING, 37, unknown, property, maxdelay, max, delay

Urgency: Standard

General Description:
When I use the "maxdelay" property in a CST (XST constraint) file or as an attribute, the following warning message is reported:

"4.2: WARNING:Xst:37 - Unknown property "maxdelay"."

Solution

XST does not recognize the "maxdelay" property when it is used in a CST file or as an attribute.

To work around this problem, use the following in the UCF file:

NET " net_name" MAXDELAY= value units;

This problem was fixed in the 5.1i software.

For a complete listing of constraints that are recognized by XST, please see (Xilinx Answer 8487).
AR# 15298
Date Created 08/01/2002
Last Updated 10/13/2003
Status Archive
Type General Article