重学Verilog(1)

1.线与、线或功能

wor

 module  WO(A, B, C, D, WireOR)
 input A,B,C,D;
 output WireOr;
 wor WireOr;
 assign WireOr = A^B;
 assign WireOr = C&D;
 endmodule

2.三态门

assign WireTri = (En) ? 'bZ : (A^V)

3.assign 和 deassign : 在过程语块中对寄存器变量强制赋值和放开；

force 和 release : 在过程语块中对寄存器和线网强制赋值和放开；

module DEF(D, Clr, Clk, Q)
input D, Clr, Clk;
output Q;
reg Q;

always @ (Clr) begin
    if (!Clr)
        assign Q = ;
    else
        deassign Q;
end

always @ (negedge Clk)
    Q <= D;
endmodule

4.fork..join...

并行语句，内部并行执行

initial
fork
DataBin = ;
#  DataBin = ;
#  DataBin = ;
#  DataBin = ;
join