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CAPTABLE file

RahulRc

Hi all,

 i am going through the Captable file, but unable to understand the format and info given in the file.

 can anyone explain me the same.

 Thanks in advance.

Parents
  • Captable file contains resistance and capacitance values which are used to model the interconnect parasitics of a design. Captable files usually contains resistance value and capacitance values. The capacitance values for a range of width and spacing of each metal used in the corresponding technology are defined.     an example is as shown below  for  metal 1(M1) :

    width(um)  space(um)   Ctot(Ff/um)  Cc(Ff/um)    Carea(Ff/um) Cfrg(Ff/um)
    0.500             0.360               0.2606       0.0912       0.0459       0.0156
    0.500             0.450               0.2309       0.0730       0.0459       0.0190
    0.500             1.400               0.1653       0.0153       0.0459       0.0442
    0.500             2.350               0.1618       0.0041       0.0459       0.0537
    0.500             3.300               0.1615       0.0011       0.0459       0.0566
    0.500             4.250               0.1615       0.0003       0.0459       0.0574    

    the total cpacitance, coupling capacitance,area capacitace, fringe capacitance are defined. This information is used while extracting the nets.
Reply
  • Captable file contains resistance and capacitance values which are used to model the interconnect parasitics of a design. Captable files usually contains resistance value and capacitance values. The capacitance values for a range of width and spacing of each metal used in the corresponding technology are defined.     an example is as shown below  for  metal 1(M1) :

    width(um)  space(um)   Ctot(Ff/um)  Cc(Ff/um)    Carea(Ff/um) Cfrg(Ff/um)
    0.500             0.360               0.2606       0.0912       0.0459       0.0156
    0.500             0.450               0.2309       0.0730       0.0459       0.0190
    0.500             1.400               0.1653       0.0153       0.0459       0.0442
    0.500             2.350               0.1618       0.0041       0.0459       0.0537
    0.500             3.300               0.1615       0.0011       0.0459       0.0566
    0.500             4.250               0.1615       0.0003       0.0459       0.0574    

    the total cpacitance, coupling capacitance,area capacitace, fringe capacitance are defined. This information is used while extracting the nets.
Children
  • in reply to gops

    Hello, I have a question about the captable fie. I want to know the table show  capaticance is the final capacitance value,or is the capacitance for unit width. That is to say, for the first line,when width=0.500u, space=0.360u, the final capacitance=Ctot=0.2606Ff. Or the final capacitance = 0.500 * Ctot=0.500 * 0.2606Ff. Can anyone tell me? Thanks a lot !

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