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(* synthesize *)
module mkFibOne();
// register containing the current Fibonacci value
Reg#(int) this_fib(); // interface instantiation
mkReg#(0) this_fib_inst(this_fib); // module instantiation
// register containing the next Fibonacci value
Reg#(int) next_fib();
mkReg#(1) next_fib_inst(next_fib);
rule fib; // predicate condition always true, so omitted
this_fib <= next_fib;
next_fib <= this_fib + next_fib; // note that this uses stale this_fib
$display("%0d", this_fib);
if ( this_fib > 10000 ) $finish(0) ;
endrule: fib
endmodule: mkFibOne
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