CTS后DRC violation无法修复，显示dont_touch

dennisi123

回复 30# fangwang85


   你好，我在手册里查到如下：By default, the tool ignores the dont_touch attribute on cells and nets during clock treesynthesis and clock tree optimization.

关于clock_opt的描述：
Optimizes the clock trees.
      During clock tree optimization, the tool uses the optimization techniques, such as buffer
relocation, buffer sizing, delay insertion, gate sizing, and gate relocation, to further
improve the skew.
Note:
      During clock tree optimization, the tool ignores the dont_touch attribute on cells and
nets. To prevent sizing of cells during clock tree optimization, use the
      set_clock_tree_exceptions -dont_size_cells command.
      You can also run clock tree optimization as a standalone process, using the
optimize_clock_tree command, as described in “Performing Clock Tree Optimization”
所以这这两个命令都是ignore dont_touch的

fangwang85

回复 31# dennisi123


   恩，是的。我遇到跟你同样的问题，只不过是信号线，signal的，通过mark_clock_tree 解决了

xylyc521

回复 32# fangwang85


   只要是transition 没问题      fanout  无所谓了

dennisi123

回复 33# xylyc521


   嗯，不过还是尽量能修就修吧，我流片机会少，不能冒风险啊

fangwang85

回复 33# xylyc521


   我遇到的就是tran的错误，类型差不多，可以通过这个方法修正

小干爹z2z

回复 25# dennisi123


   clock_opt -only_cts -no_clock_route = compile_clock＿tree  + optimize_clock_tree + balance_inter_clock ....
workshop上应该有讲的啊

dennisi123

回复 36# 小干爹z2z


   非常感谢！workshop上确实写了，只是自己看的太粗心，没有注意到。先摘录如下：Besides using clock_opt to perform both phases,they can also be run separately using the following atomic commands:
Phase 1 : compile_clock_tree
Phase 2 : optimize_clock_tree