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fplan-布局
2022-06-27 03:26:00 【卢卡猫】
1. block面积估算
block面积估算公式:
Size = stand cell area /0.65 + macro area /0.82
0.65和0.82只是一个经验值,需要根据实际情况以及设计所用到的金属层次、工艺特点去动态调整,而模块的利用率往往只能做到平均值为65%左右。因为还要考虑或许优化过程中还会插入一些buffer,如果预设太高的话,可能后期的cell density会太高防止布线困难,太低则浪费面积,而对macro来说一般利用率可以高达82%左右,因为只需要在macro四周打上2um左右的hard blockage。Area Utilization一般在50%~75%之间,该参数可以根据具体设计的性能参数而定。
## ICC2:
## area
set stdcell_areas 0
set cells [get_cells -q 边栏推荐
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