描述

General description:

In trace1.5is2 sometimes you will get the warning like this:

WARNING:basts:157 - PERIOD TIMESPEC 'TS_MYCLk' has TIMEGRP

'MYCLK' which contains a mixture of PADs and synchronous

elements. The PADs in this group will be exempt from analysis by the

trce application. The ability to mix PADs and synchronous elements

in a PERIOD group will soon be obsoleted.

解决方案

Currently PERIOD constraint covers input pad to synchronous element and

from synchronous element to synchronous element but excludes synchronous

element to output pad. In next release input pad to synchronous element

will not be included any longer.

So the technique is to either have the offset or

have a FROM pads TO ffs constraint.