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Finding out if a net is a bus, if so find total number of signals

rotanudad

I.e. foreach(net cellView~>nets 

    ; check if net is a bus, and the total number of signals/iterations

)

I've also tried regex to parse the name to find out, but I'm having trouble with capture groups. I could not find any functions in the pcre regex suite to do the following:

E.g.  I have a string: "<*123>A_signal"

I want to use a regex expression "<\\*([0-9]+)>(.*)" 

In between the round brackets '()' I wish to capture the values, in this case it is "123" and "A_signal". 

Any help is appreciated!

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  • skillUser

    Hi,

    Each net object has an attribute "numBits" which will be 1 for a scalar net and  (typically - I think a singleton bus bit might also have numBits as 1) >1 for a bus.  There are other useful attributes such as 'signals' and 'sigNames' to reach individual members.

    Hopefully this will help you?

    Regards,

    Lawrence.

  • Andrew Beckett
    in reply to skillUser

    You can also use dbGetNameNumBit() if you want to find the width (although getting the info directly from the database would make sense in this case as Lawrence suggested). There's also dbProduceMemName() to expand a name into individual members - although you can look at the ~>signals to do that from the net.

    I would strongly discourage you reinventing the wheel by using regular expressions to parse the net name. It's likely to be incomplete and really should be unnecessary - there are enough utility functions to do what you want, as well as direct info in the database.

    Regards,

    Andrew

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  • Andrew Beckett
    in reply to skillUser

    You can also use dbGetNameNumBit() if you want to find the width (although getting the info directly from the database would make sense in this case as Lawrence suggested). There's also dbProduceMemName() to expand a name into individual members - although you can look at the ~>signals to do that from the net.

    I would strongly discourage you reinventing the wheel by using regular expressions to parse the net name. It's likely to be incomplete and really should be unnecessary - there are enough utility functions to do what you want, as well as direct info in the database.

    Regards,

    Andrew

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