vend.gv

几个简单的verilog代码

/**************************************************************************
Adapted from Example 14-7 Optimized Gate-Level Netlist for Newspaper Vending 
Machine FSM,  "Verilog HDL  A Guide to Digital Design and Synthesis"
By Samir Palnitkar, Prentice Hall, ISBN 0-13-451675-3 
**************************************************************************/

//Alternative method to specify the library file. 
//!library .\abc_100.v

module vend ( coin, clock, reset, newspaper );
input  [1:0] coin;
input  clock, reset;
output newspaper;
    wire \PRES_STATE[1] , n289, n300, n301, n302, \PRES_STATE243[1] , 
					n303, n304, \PRES_STATE[0] , n290, n291, n292, n293, n294, 
					n295, n296, n297, n298, n299, \PRES_STATE243[0] ;
    PDFF \PRES_STATE_reg[1]  ( .clk(clock), .d(\PRES_STATE243[1] ), 
										.clrbar( 1'b1), .prebar(1'b1), .q(\PRES_STATE[1] ) );
    PDFF \PRES_STATE_reg[0]  ( .clk(clock), .d(\PRES_STATE243[0] ), 
										.clrbar( 1'b1), .prebar(1'b1), .q(\PRES_STATE[0] ) );
    VOR U119 ( .in0(n292), .in1(n295), .out(n302) );
    VAND U118 ( .in0(\PRES_STATE[0] ), .in1(\PRES_STATE[1] ), .out(newspaper)
         );
    VNAND U117 ( .in0(n300), .in1(n301), .out(n291) );
    VNOR U116 ( .in0(n298), .in1(coin[0]), .out(n299) );
    VNOR U115 ( .in0(reset), .in1(newspaper), .out(n289) );
    VNOT U128 ( .in(\PRES_STATE[1] ), .out(n298) );
    VAND U114 ( .in0(n297), .in1(n298), .out(n296) );
    VNOT U127 ( .in(\PRES_STATE[0] ), .out(n295) );
    VAND U113 ( .in0(n295), .in1(n292), .out(n294) );
    VNOT U126 ( .in(coin[1]), .out(n293) );
    VNAND U112 ( .in0(coin[0]), .in1(n293), .out(n292) );
    VNAND U125 ( .in0(n294), .in1(n303), .out(n300) );
    VNOR U111 ( .in0(n291), .in1(reset), .out(\PRES_STATE243[0] ) );
    VNAND U124 ( .in0(\PRES_STATE[0] ), .in1(n304), .out(n301) );
    VAND U110 ( .in0(n289), .in1(n290), .out(\PRES_STATE243[1] ) );
    VNAND U123 ( .in0(n292), .in1(n298), .out(n304) );
    VNAND U122 ( .in0(n299), .in1(coin[1]), .out(n303) );
    VNAND U121 ( .in0(n296), .in1(n302), .out(n290) );
    VOR U120 ( .in0(n293), .in1(coin[0]), .out(n297) );
endmodule