UPGRADE YOUR BROWSER

We have detected your current browser version is not the latest one. Xilinx.com uses the latest web technologies to bring you the best online experience possible. Please upgrade to a Xilinx.com supported browser:Chrome, Firefox, Internet Explorer 11, Safari. Thank you!

AR# 3016

M1 TNM placed on net between PAD and BUFG/IBUF not forward traced

Description

Keywords: TNM, propagate, forward trace

Urgency: standard

General Description:

For the following arrangement:

IPAD -- clockpad -- IBUF -- clock



Placing a TNM on "clockpad" will not forward propagate the
TNM to all flip-flops this net goes to.

解决方案

1

A TNM must be placed on
the output of the clock buffer (BUFG,BUFGP,BUFGS,BUFGLS,BUFGE)
or the input buffer (IBUF) for forward propagation to occur:

NET clock TNM = mygroup;


2

There is a new constraint for M1.5 called TNM_NET. If you replace TNM with TNM_NET it will trace through the buffer to the next synchronous element.
AR# 3016
创建日期 10/30/1997
Last Updated 04/03/2000
状态 Archive
Type 综合文章