描述

General Description:

There is no specific constraint that will force the

use of a particular routing resource, unless you make a

hard macro.

解决方案

Here are some possibilites:

1) Use timespecs

2) Align logic using given signal into column (using RLOCs/LOCs). This

will encourage use of vertical longlines.

3) Use PCF constraint: NET my_net PRIORITIZE = 90;

This, along with timespec, will encorage use of longlines.

4) Modify the design in EPIC to use longlines.