请教，为什么DC综合后的时序报告会有这么多的warning，应该怎么改脚本，谢谢

tbag12345

请教，为什么DC综合后的时序报告会有这么多的warning，都是以下面这种形式的
Warning: In design '。。。', net '。。。' driven by pin '。。。' has no loads. (LINT-2)
是不是我的约束不合理，我design的所有输出都设的下面这种形式
set_load 0.4 [get_ports D_out]      -pin_load

是不是不太合理，应该怎么改脚本，谢谢大虾们

（上千行的下面这种warning）
Warning: In design 'digital_cal', net 'n131125' driven by pin 'digital1_mult6_clk_r_REG522_S2/Q' has no loads. (LINT-2)
Warning: In design 'digital_cal', net 'n131111' driven by pin 'digital1_mult5_clk_r_REG29_S2/Q' has no loads. (LINT-2)
Warning: In design 'digital_cal', net 'n131109' driven by pin 'digital1_mult5_clk_r_REG1_S2/Q' has no loads. (LINT-2)
Warning: In design 'digital_cal', net 'n131093' driven by pin 'digital1_mult5_clk_r_REG27_S2/Q' has no loads. (LINT-2)
Warning: In design 'digital_cal', net 'n131092' driven by pin 'digital1_mult5_clk_r_REG26_S2/Q' has no loads. (LINT-2)
Warning: In design 'digital_cal', net 'n131091' driven by pin 'digital1_mult5_clk_r_REG25_S2/Q' has no loads. (LINT-2)
Warning: In design 'digital_cal', net 'n131090' driven by pin 'digital1_mult5_clk_r_REG24_S2/Q' has no loads. (LINT-2)
Warning: In design 'digital_cal', net 'n131089' driven by pin 'digital1_mult5_clk_r_REG23_S2/Q' has no loads. (LINT-2)
Warning: In design 'digital_cal', net 'n131087' driven by pin 'digital1_mult5_clk_r_REG21_S2/Q' has no loads. (LINT-2)
Warning: In design 'digital_cal', net 'n131085' driven by pin 'digital1_mult5_clk_r_REG19_S2/Q' has no loads. (LINT-2)
Warning: In design 'digital_cal', net 'n131084' driven by pin 'digital1_mult5_clk_r_REG18_S2/Q' has no loads. (LINT-2)

zh123456789

看看代码是不是这样写的，

supergzy007

这些warning没有问题，综合时调用的基本单元，有些管教并没有用到，就会有no load的情况。

tbag12345

谢谢，是我犯了个小错误 3# supergzy007

心海的一滴泪

明显是内部有些CELL的管脚没用到,呵呵
如果是整个module的输出管脚无load就得注意了

lycxy521

严重的谢谢楼主了啊!呵呵

eric_quan

我也学习了，最近正在学习dc。

bigming85

请问楼主是怎么解决问题的？ 我也遇到啦

edwinwu

请教LZ 这个问题是怎么解决的？

xuzhonglong

明显是内部有些CELL的管脚没用到,呵呵
如果是整个module的输出管脚无load就得注意了