问答 #32957 - 11.2 Constraint System - Net PERIOD constraints are been pushed from the REFCLK input to the RXRECCLK output of GTP/GTX

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11.2 Constraint System - Net PERIOD constraints are been pushed from the REFCLK input to the RXRECCLK output of GTP/GTX

问答编号#	32957
型号	SW-Constraints System
最后更新日期	2009-06-26 00:00:00.0
记录状态	Active
关键词	Constraint System, Timing, GTP, REFCLK, RXRECCLK

疑问描述

Keywords: Constraint System, Timing, GTP, REFCLK, RXRECCLK

The NET PERIOD constraints are been pushed from the REFCLK input to the RXRECCLK output of the GTP/GTX components. RXRECCLK is a recovered clock, generated by the data transitions in the GT. Only in some configurations the input clock is related to RXRECCLK, but the majority of the time the constraint system should not push the NET PERIOD constraint from the REFCLK input to the RXRECCLK output.

When is this going to be fixed?

解决方案

This is a known issue. This is scheduled to be fixed in 11.3.