我用ICC做完P&R之后,用route_zrt_eco修掉DRC的错误,运行verify_lvs后,错误报告如下:
Floating Net 2
Floating Port 40
Open 4
我看了一下,那2个Floating Net是我的power ring和power strap,我的这部分电路是整个电路的一个子模块,我这个子模块单独P&R,DVDD和DVSS需要通过pin连到大电路中的DVDD和DVSS网络;那40个Floating Port是因为有40个stand cell的VDD pin和VSS pin没有连到DVDD和DVSS上;那4个Open我点一下,电路一片白色。
我运行verify_pg_net后,结果如下:
Checking [DVSS]:
There are no floating shapes
ERROR: There are 2242 floating pins
Checking [DVDD]:
There are no floating shapes
ERROR: There are 2242 floating pins
Checked 2 nets, 2 have Errors
再运行check_mv_design -power_nets,结果如下:
P/G net name P/G pin count
Other power nets : 2242
Unconnected power pins : 0
Other ground nets : 2242
Unconnected ground pins : 0