在用PT读入spef文件做timing sign-off时,发现有这样的warning
“the drive-resistance for the timing arc u_xx_sda/PAD--->C is much less than the network impedance to ground ;
PrimeTime has adjusted the drive-resistance to improve accuracy.(RC-009)"
图片不能显示,内容如下:
Warning :An extrapolation far outside the library characterization range has been detected and the delay calculation uses the last library index incremented by 10% for the cell timing arc ,(***/BUFHDV4) u_**/**/**/I-->Z (max positive_unate) [r/f total_cap = 0.28056/0.26447, lib_range = [0.0005 0.234949]/[0.0005 0.234949] (pf)}
(RC-011)