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I am trying to make a logic to electrical connect module that can convert logic ( '1' or '0') at the input side to electrical pulses at the output side, implementing in verilog-ams, its required for one of the project that I am doing. But, the problem that I am having is that, its running and simulation is taking place, but irrespective of whether I give '1 or a logic '0'', the output is staying at 818.18mV. My Vhigh= 1.8 V and Vlow= 0v.
I am attaching the code that I am trying to implement....
`timescale 1ns / 10ps
connectmodule d2a (out, in);
parameter real v0 = 0.0; // output voltage for a logic 0 (V)
parameter real v1 = 5.0; // output voltage for a logic 1 (V)
parameter real vx = 2.5; // output voltage for a logic x (V)
parameter real vz = 5.0; // output voltage for a logic z (V)
parameter real r0 = 1k from (0:inf); // output resistance for a logic 0 (Ohms)
parameter real r1 = 1k from (0:inf); // output resistance for a logic 1 (Ohms)
parameter real rx = 100 from (0:inf); // output resistance for a logic x (Ohms)
parameter real rz = 1M from (0:inf); // output resistance for a logic z (Ohms)
parameter real tr=1n from [0:inf); // rise time (s)
parameter real tf=1n from [0:inf); // fall time (s)
real v, r;
assign in = in;
1'b0: begin v = v0; r = r0; end
1'b1: begin v = v1; r = r1; end
1'bx: begin v = vx; r = rx; end
1'bz: begin v = vz; r = rz; end
always @in begin
V(out) <+ transition(v, 0, tr, tf) + transition(r, 0, tr, tf)*I(out);