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Using "add net constraints" command in Conformal

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Hi

I have tried using "add net constraints" command to place one-cold constraints on a tristate enable bus. In the command line we need to specify the "net pathname" on which the constraints are to be enforced.

The bus here is 20-bit. How should the net pathname be specified to make this 20-bit bus signals one_hot or one_cold.

The bus was declared as follows:
ten_bus [19:0]

The command I used was

add net constraints one_hot /ren_bus[19]

What would the above command mean?
Should we not specify all the nets' pathnames on the bus?
Is it sufficient to specify the pathname of one net on the bus?
I could not get much info regarding the functionality of this command. I would be obliged if anyone can throw some light.

Thanks
Prasad.


Originally posted in cdnusers.org by anssprasad
Parents

  • Hi Bryan,

    I am not sure why my post is looking like that, may be there is a typo error. The command I actually used was

    add net constraints one_hot /ten_bus[19]
    add net constraints one_hot /ten_bus[19] /ten_bus[18] ...

    My intention is to constrain the whole 20 bit bus (i.e, ten_bus[19] . . . . . . ten_bus[0]) are to be constrained as one_hot. Only the above commands does not fire any error messages and I dont understand how it works.

    I am afraid I did not uderstand the two modes tcl and vpx you have mentioned. I did not find any such in Conformal EC. Based on your suggestions I have tried using the following command but encountered an error message saying such a net is not found.

    add net constraints one_hot /ten_bus\[*\]

    Hope I make some sense.

    Thanks
    Prasad


    Originally posted in cdnusers.org by anssprasad
Reply

  • Hi Bryan,

    I am not sure why my post is looking like that, may be there is a typo error. The command I actually used was

    add net constraints one_hot /ten_bus[19]
    add net constraints one_hot /ten_bus[19] /ten_bus[18] ...

    My intention is to constrain the whole 20 bit bus (i.e, ten_bus[19] . . . . . . ten_bus[0]) are to be constrained as one_hot. Only the above commands does not fire any error messages and I dont understand how it works.

    I am afraid I did not uderstand the two modes tcl and vpx you have mentioned. I did not find any such in Conformal EC. Based on your suggestions I have tried using the following command but encountered an error message saying such a net is not found.

    add net constraints one_hot /ten_bus\[*\]

    Hope I make some sense.

    Thanks
    Prasad


    Originally posted in cdnusers.org by anssprasad
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