AR# 29362

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14.x Timing Analysis - "WARNING:Timing:3224 - The clock 'CLOCK' associated with '%s' does not clock any registered '%s' components"

描述

在时序报告中报告了以下警示:

WARNING:Timing:3224 - The clock CLKIN associated withTIMEGRP "datain_registers" OFFSET = IN 3ns BEFORE COMP "CLKIN" HIGH;does not clock any registered input components.

联合目录文档中参考的约束如下:

NET "CLKIN" TNM_NET = datain_registers;
TIMEGRP "datain_registers" OFFSET = IN 3ns BEFORE "CLKIN" HIGH;

解决方案

该 OFFSET IN 约束的语法不正确。记住,把参考寄存器组放在方程式的右边,把暂存器组放在方程式的左边。正确的语法是:

[TIMEGRP "padgroup_name"] OFFSET=IN time unit BEFORE pad_clock_netname [TIMEGRP "reg_group_name"];

本例中,datain_registers 是 CLKIN 定时的寄存器组。它不会影响任何暂存器组件。因此,OFFSET IN 约束不涵盖任何输入路径。这和 OFFSET OUT 约束一样。

如果时钟路径不涉及时钟管理组件,如 DCM、PLL 和 MMCM,请确保输入时钟网络的周期约束可传播至实际可驱动输入寄存器的时钟。

AR# 29362
日期 11/23/2016
状态 Active
Type 综合文章
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