#+begin_src bash
1. Run command
verilator -Wall --language VAMS --cc DAC6.vams
1. Error log
%Error: Unknown language specified: VAMS
%Error: Command Failed /nix/store/44qhhq29xqi8f3h6n1pmjnlzgpagwy4z-verilator-4.016/bin/verilator_bin -Wall --language VAMS --cc DAC6.vams
make: *** [Makefile:2: default] Error 10
#+end_src

#+begin_src vams :filename DAC6.vams
`include "disciplines.vams"
module DAC6 (Din,Aout, Vdd,Vss);
input [5:0] Din; // digital input bus
output Aout; // analog output
input Vdd,Vss; // reference supply for output
electrical Aout,Vdd,Vss;
parameter real tr=10n; // (sec) risetime for output changes
parameter real rout=1k; // (ohms) output resistance
real kout; // output as fraction of supply
real vout; // continuous analog output voltage
always begin
 if (^Din === 1âbx) kout=0; // if any bits invalid in Din, output is zero
 else kout = Din/63.0; // else compute scale factor for output
 @(Din); // repeat whenever Din changes
end
analog begin
 vout = V(Vdd,Vss)*transition(kout,0,tr,tr); // ramp to fraction of supply
 I(Aout,Vss) <+ (V(Aout,Vss)-vout)/rout; // drive output
voltage+resistance
end
endmodule
#+end_src