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Ref to variables

Leo1008

 Hi,

I wanted to know if I can pass, to a class method , references of variables not defined in that class??

 

Insiya

  • Hi,

     

    I do not think you can pass a variable which is not defined in the class ,to its method.This is because the class must know beforehand the type of the variable (I think)

     

    For example when you pass the channel handle to the constructor of the driver ,you need to define the channel handle before utilizing it.Oki let me put up a pseudo code for this

     

    Top

    class env_top extends vmm_env {

    virtual function build() {

    vmm_channel channel = new():

    //The channel connects the gen and driver.

    gen = new(channel);

    drv = new (channel) ;

    } //end build

    -------------------------------------------------

    class atm_drv extends vmm_xactor

    {

     vmm_channel channel_drv;

      function new(vmm_channel channel) {

       if(channel == null ) channel = new;

       this.channel_drv = channel;

    } //end function new

     

    //Usage

    virtual task main () {

     this.channel_drv.peek_t(vmm_data transaction)

     @posedge clk

     ----driver code

    } //end of main     

       Note : the code is not correct syntactiacally.

    Regards,

    Pooja

     

     

  • Anything you want the class to use that is outside of the class needs to be passed into the class via the new constructor.

    class foo;

      int a;

      function new(int in);

        a = in;

      endfunction

    endclass

    module test;

      foo f;

      initial f = new(10); // the value 10 is passed into the class

    endmodule


    Tim

  • Thanks Pooja and thanks Tim.

    Even I was thinking that may be I could pass something not defined in the class via the new constructor. Now I am sure :).

    Insiya

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