[Verilog-A] Problem with the code

[leejh6783]

Hi, I am trying to make a pulse generator with conditional delay.
But it is not working.
Can someone help me with this?

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Code  - [expand]
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module verilog_pulse(out);
 
output out;
electrical out;
 
parameter real fpul = 500M;
parameter real fsin = 242M;
parameter real vdd = 0.8;
parameter real t_tran = 0;
parameter real va = 1;
 
real p,phase,vout,t_delay;
 
analog begin
 
@(initial_step) begin
  p=0;
 
       @(timer(0, 1/fpul*0.5)) begin
         if (p==0) begin
               vout=0;
               p=1;
         end
         else if (p==1) begin
               vout=vdd;
               p=0;
 
       phase = 2*`M_PI*idtmod(fsin, 0.0, 1.0, -0.5);
       t_delay = va*sin(phase);
       end
       end
 
       V(out) <+ transition(vout,t_delay,t_tran);
end

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Thank you,