AR #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

AR#	32957
Part	SW-Constraints System
Last Modified	2009-06-26 00:00:00.0
Status	Active
Keywords	Constraint System, Timing, GTP, REFCLK, RXRECCLK

Description

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?

Solution

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