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How to model bidir switch in RNM

dontknow over 4 years ago

I was wondering if there was a way of modelling bidir switch.

Using code, I always have a problem of propagating signal.

For instance:

module bidir_sw( a, b, ctrl);

inout a;

inout b;

inout ctrl

wreal a;

wreal b;

logic ctrl;

// this will only work from b -> a

assign a = (ctrl == 1'b1) ? b : `wrealZState;

// this will only work from a -> b

assign b = (ctrl == 1'b1) ? a : `wrealZState;

endmodule

Is there an easy way to make it work both ways, using XCELIUM ?

Parents

dontknow over 4 years ago

Hi Frank,

thanks for reply.

Can I do it using vams ? Or SystemVerilog is the only way to achieve it ?
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Frank Wiedmann over 4 years ago in reply to dontknow

It seems to be possible with VAMS as well, if I read the manual section Writing Bidirectional Model Behavior correctly.
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dontknow over 4 years ago in reply to Frank Wiedmann

Hi Frank,

sorry to bother you again, but I still don't understand hot the whole thing works. Would yoy be able to provide me with vams module that does behaves like a bidirectional switch ?

Thank you,

Gianluca
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dontknow over 4 years ago in reply to Frank Wiedmann

Hi Frank,

sorry to bother you again, but I still don't understand hot the whole thing works. Would yoy be able to provide me with vams module that does behaves like a bidirectional switch ?

Thank you,

Gianluca
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Children

Frank Wiedmann over 4 years ago in reply to dontknow

The vams module is given in the manual section I mentioned. I don't think that I am allowed to post the code here (someone from Cadence might be able to do so).
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