问答 #32455 - 11.1 Constraints Editor Known Issue - When I attempt to select my input clock in Constraints Editor, all I see is the clock that comes out of my ISERDES

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11.1 Constraints Editor Known Issue - When I attempt to select my input clock in Constraints Editor, all I see is the clock that comes out of my ISERDES

问答编号#	32455
型号	SW-Constraints Editor
最后更新日期	2009-04-20 00:00:00.0
记录状态	Active
关键词	top-level, port, pin, internal, inputs

疑问描述

Keywords: top-level, port, pin, internal, inputs

When I attempt to select my input clock in Constraints Editor, all I see is the clock that comes out of my ISERDES.

Why am I unable to see my input clock in the clock list?

解决方案

The Constraints Editor is not tracing back to the input clock and is only referencing the clock that comes out of the ISERDES component.

This issue should be fixed in the next major release.

To work around this issue, manually add the constraints to the UCF.