综合中的max_transition&max_capacitance violation怎么修改
时间：10-02
整理：3721RD
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一个简单的例子中综合出来出现2个violated,
set_load 2 [all_outputs] 比较大,
如果输出的负载不能减小,该如何解决这2个violated?
Net: sum
max_transition4.50
- Transition Time6.51
------------------------------
Slack-2.01(VIOLATED)
List of pins on net "sum" with transition violations :
-----------------------------------------------------------------
RequiredActual
TransitionTransitionSlack
-----------------------------------------------------------------
PIN :U1/Y4.506.51-2.01(VIOLATED)
Net: sum
max_capacitance1.25
- Capacitance2.03
------------------------------
Slack-0.78(VIOLATED)
set_load 2 [all_outputs] 比较大,
如果输出的负载不能减小,该如何解决这2个violated?
Net: sum
max_transition4.50
- Transition Time6.51
------------------------------
Slack-2.01(VIOLATED)
List of pins on net "sum" with transition violations :
-----------------------------------------------------------------
RequiredActual
TransitionTransitionSlack
-----------------------------------------------------------------
PIN :U1/Y4.506.51-2.01(VIOLATED)
Net: sum
max_capacitance1.25
- Capacitance2.03
------------------------------
Slack-0.78(VIOLATED)
add buffers
手动加吗?
我是想怎么能让软件自动加,增大输出的驱动能力.
在综合约束中怎么写?
output的max_tran违反感觉没有问题的，PR时会自动修掉的