tie cell的max capacitance违例很大很多
时间:10-02
整理:3721RD
点击:
知道 max_capa不是硬性要求,但我的tie cell的max_capa违例很多,之前也用命令设置优化选项了set_auto_disable_drc_nets 但tie cell的max capa违例很大
max_capacitance
RequiredActual
NetCapacitanceCapacitanceSlackScenario
-----------------------------------------------------------------
TIEL_HVT!U81_net34.4900209.7376-175.2476 (VIOLATED) func_wc_cmax
TIEL_HVT!U117_net34.4900207.0776-172.5876 (VIOLATED) func_wc_cmax
TIEL_HVT!U118_net34.4900195.1002-160.6102 (VIOLATED) func_wc_cmax
TIEL_HVT!U122_net34.4900191.8032-157.3132 (VIOLATED) func_wc_cmax
TIEL_HVT!U103_net34.4900174.6654-140.1754 (VIOLATED) func_wc_cmax
TIEL_HVT!U104_net34.4900173.7843-139.2943 (VIOLATED) func_wc_cmax
TIEL_HVT!U106_net34.4900171.9773-137.4873 (VIOLATED) func_wc_cmax
TIEL_HVT!U0_net34.4900159.3958-124.9058 (VIOLATED) func_wc_cmax
想问下,这个如何解决?或者说是什么引起的呢,是不是在 connect_tie_cell之前,用set_attribute设置这些tie cell的max_cap和max_fanout属性呢
max_capacitance
RequiredActual
NetCapacitanceCapacitanceSlackScenario
-----------------------------------------------------------------
TIEL_HVT!U81_net34.4900209.7376-175.2476 (VIOLATED) func_wc_cmax
TIEL_HVT!U117_net34.4900207.0776-172.5876 (VIOLATED) func_wc_cmax
TIEL_HVT!U118_net34.4900195.1002-160.6102 (VIOLATED) func_wc_cmax
TIEL_HVT!U122_net34.4900191.8032-157.3132 (VIOLATED) func_wc_cmax
TIEL_HVT!U103_net34.4900174.6654-140.1754 (VIOLATED) func_wc_cmax
TIEL_HVT!U104_net34.4900173.7843-139.2943 (VIOLATED) func_wc_cmax
TIEL_HVT!U106_net34.4900171.9773-137.4873 (VIOLATED) func_wc_cmax
TIEL_HVT!U0_net34.4900159.3958-124.9058 (VIOLATED) func_wc_cmax
想问下,这个如何解决?或者说是什么引起的呢,是不是在 connect_tie_cell之前,用set_attribute设置这些tie cell的max_cap和max_fanout属性呢
围观学习
很奇怪, 一个tie net带了多少fanout,一般不要超过20
这个20是个经验值吗?
在最后signoff时 倒没有发现max_capa的违例!