文章目錄sdc中設(shè)置了set_multicycle_pathlib里面timing arc既有positive_unate又有negative_unateclock的占空比不是50%sdc中設(shè)置了set_multicycle_pathsetup multicycle的默認(rèn)值是1hold multicycle的默認(rèn)值是0。如下所示pt_shell set_multicycle_path -setup 1 -from ff1/CP -to ff2/Dpt_shell set_multicycle_path -hold 0 -from ff1/CP -to ff2/D下面所示為setup 2 cycle check, hold同沿check.pt_shell set_multicycle_path -setup 2 -from ff1/CP -to ff2/Dpt_shell set_multicycle_path -hold 1 -from ff1/CP -to ff2/D下面所示為setup 1 cycle check, hold向前借一個(gè)周期.pt_shell set_multicycle_path -setup 1 -from ff1/CP -to ff2/Dpt_shell set_multicycle_path -hold 1 -from ff1/CP -to ff2/D下面所示為setup 2 cycle check, hold向前借一個(gè)周期.pt_shell set_multicycle_path -setup 2 -from ff1/CP -to ff2/Dpt_shell set_multicycle_path -hold 2 -from ff1/CP -to ff2/Dlib里面timing arc既有positive_unate又有negative_unateclock的占空比不是50%可通過(guò)report_clock指令reports clock-related information.當(dāng)setup/hold check邊沿不對(duì)時(shí)可能存在上述的原因具體情況需要具體分析。