2. 技术支持
  3. AR# 8038: 8.1i TRCE/Timing Analyzer/Constraint - Can I constrain a path (FROM:TO) through an LD latch in the IOB? (lat_d_q)

AR# 8038

8.1i TRCE/Timing Analyzer/Constraint - Can I constrain a path (FROM:TO) through an LD latch in the IOB? (lat_d_q)

描述

Can I set a path constraint on a continuous path through an LD latch in the IOB?

解决方案


No. As the latch is considered to be combinatorial logic, the FROM:TO constraints must be set from pad-to-latch and latch-to-pad.



To enable a constraint to go through the latch, add the following line to the PCF/UCF:



enable=lat_d_q;
AR# 8038
日期 11/18/2010
状态 Archive
Type 综合文章