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module Mux8x1 ( i1, i2, i3, i4, i5, i6, i7, i8, s0, s1, s2, o ); // 16 output o; input i1, i2, i3, i4, i5, i6, i7, i8; input s2, s1, s0; wire x, y; Mux4x1 M1 ( i1, i2, i3, i4, s0, s1, x ); Mux4x1 M2 ( i5, i6, i7, i8, s0, s1, y ); Mux2x1 M3 ( x, y, s2, o ); endmodule
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module Mux8x1_16 ( i1, i2, i3, i4, i5, i6, i7, i8, s, o ); output [15:0] o; input [15:0] i1, i2, i3, i4, i5, i6, i7, i8; input [2:0] s; Mux8x1 M[15:0] ( i1, i2, i3, i4, i5, i6, i7, i8, s[0], s[1], s[2], o ); endmodule
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module Sim16Mux8x1; // 15 wire [15:0] o; reg [15:0] i0, i1, i2, i3, i4, i5, i6, i7; reg [2:0] s; Mux8x1_16 M ( i0, i1, i2, i3, i4, i5, i6, i7, s, o ); initial begin i0 = 6234; i1 = 725; i2 = 7524; i3 = 5734; i4 = 8354; i5 = 28457; i6 = 2458; i7 = 2547; s = 0; #100; s = 1; #100; s = 2; #100; s = 3; #100; s = 4; #100; s = 5; #100; s = 6; #100; s = 7; #100; i0 = 384; i1 = 398; i2 = 9337; i3 = 9353; i4 = 2457; i5 = 8542; i6 = 3659; i7 = 2854; s = 0; #100; s = 1; #100; s = 2; #100; s = 3; #100; s = 4; #100; s = 5; #100; s = 6; #100; s = 7; #100; i0 = 65535; i1 = 274; i2 = 8224; i3 = 2457; i4 = 953; i5 = 356; i6 = 82; i7 = 2485; s = 0; #100; s = 1; #100; s = 2; #100; s = 3; #100; s = 4; #100; s = 5; #100; s = 6; #100; s = 7; #100; i0 = 136; i1 = 8564; i2 = 24377; i3 = 3548; i4 = 428; i5 = 953; i6 = 9336; i7 = 524; s = 0; #100; s = 1; #100; s = 2; #100; s = 3; #100; s = 4; #100; s = 5; #100; s = 6; #100; s = 7; #100; i0 = 5483; i1 = 3485; i2 = 3658; i3 = 3659; i4 = 572; i5 = 54287; i6 = 8542; i7 = 57; s = 0; #100; s = 1; #100; s = 2; #100; s = 3; #100; s = 4; #100; s = 5; #100; s = 6; #100; s = 7; #100; i0 = 9; i1 = 39539; i2 = 54; i3 = 4845; i4 = 4258; i5 = 175; i6 = 35487; i7 = 287; s = 0; #100; s = 1; #100; s = 2; #100; s = 3; #100; s = 4; #100; s = 5; #100; s = 6; #100; s = 7; #100; i0 = 54; i1 = 4607; i2 = 40; i3 = 749; i4 = 248; i5 = 5482; i6 = 8642; i7 = 9333; s = 0; #100; s = 1; #100; s = 2; #100; s = 3; #100; s = 4; #100; s = 5; #100; s = 6; #100; s = 7; #100; i0 = 46; i1 = 9; i2 = 4; i3 = 4076; i4 = 2458; i5 = 5724; i6 = 2548; i7 = 9635; s = 0; #100; s = 1; #100; s = 2; #100; s = 3; #100; s = 4; #100; s = 5; #100; s = 6; #100; s = 7; #100; i0 = 40; i1 = 459; i2 = 55875; i3 = 3856; i4 = 3648; i5 = 836; i6 = 39; i7 = 0; s = 0; #100; s = 1; #100; s = 2; #100; s = 3; #100; s = 4; #100; s = 5; #100; s = 6; #100; s = 7; #100; i0 = 83; i1 = 8345; i2 = 86; i3 = 465; i4 = 0; i5 = 685; i6 = 836; i7 = 863; s = 0; #100; s = 1; #100; s = 2; #100; s = 3; #100; s = 4; #100; s = 5; #100; s = 6; #100; s = 7; #100; end endmodule
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module NotGate ( a, b ); // 1 output b; input a; nand (b, a, a); endmodule
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module AndGate ( a, b, c ); // 2 output c; input a, b; wire x; nand (x, a, b); nand (c, x, x); endmodule
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module OrGate ( a, b, c ); // 3 output c; input a, b; wire x, y; nand (x, a, a); nand (y, b, b); nand (c, x, y); endmodule
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module DMux1x4 ( o, s, i0, i1, i2, i3 ); // 17 output i0, i1, i2, i3; input o; input [1:0] s; wire a, b; DMux1x2 D_0 ( o, s[1], a, b ); DMux1x2 D_1 ( a, s[0], i0, i1 ); DMux1x2 D_2 ( b, s[0], i2, i3 ); endmodule
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module NotGate ( a, b ); // 1 output b; input a; nand (b, a, a); endmodule
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module AndGate ( a, b, c ); // 2 output c; input a, b; wire x; nand (x, a, b); nand (c, x, x); endmodule
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module OrGate ( a, b, c ); // 3 output c; input a, b; wire x, y; nand (x, a, a); nand (y, b, b); nand (c, x, y); endmodule
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module DMux1x4 ( o, s, i0, i1, i2, i3 ); // 17 output i0, i1, i2, i3; input o; input [1:0] s; wire a, b; DMux1x2 D_0 ( o, s[1], a, b ); DMux1x2 D_1 ( a, s[0], i0, i1 ); DMux1x2 D_2 ( b, s[0], i2, i3 ); endmodule
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module NotGate ( a, b ); output b; input a; nand (b, a, a); endmodule
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module AndGate ( a, b, c ); output c; input a, b; wire x; nand (x, a, b); nand (c, x, x); endmodule
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module OrGate ( a, b, c ); output c; input a, b; wire x, y; nand (x, a, a); nand (y, b, b); nand (c, x, y); endmodule
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module XorGate ( a, b, c ); output c; input a, b; wire a_, b_, x, y; NotGate Na ( a, a_ ); NotGate Nb ( b, b_ ); AndGate A1 ( a, b_, x ); AndGate A2 ( a_, b, y ); OrGate O ( x, y, c ); endmodule
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module NotGate ( a, b ); output b; input a; nand (b, a, a); endmodule
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module AndGate ( a, b, c ); output c; input a, b; wire x; nand (x, a, b); nand (c, x, x); endmodule
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module OrGate ( a, b, c ); output c; input a, b; wire x, y; nand (x, a, a); nand (y, b, b); nand (c, x, y); endmodule
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module XorGate ( a, b, c ); output c; input a, b; wire a_, b_, x, y; NotGate Na ( a, a_ ); NotGate Nb ( b, b_ ); AndGate A1 ( a, b_, x ); AndGate A2 ( a_, b, y ); OrGate O ( x, y, c ); endmodule
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module FullAdder ( a, b, c0, s, c ); output s, c; input a, b, c0; wire c_, x, x_, y, y_; NotGate N ( c0, c_ ); XorGate X1 ( a, b, x ); XnorGate X2 ( a, b, x_ ); AndGate A ( a, b, y ); OrGate O ( a, b, y_ ); AndGate As1 ( x, c_, s1 ); AndGate As2 ( x_, c0, s2 ); AndGate Ac1 ( y, c_, c1 ); AndGate Ac2 ( y_, c0, c2 ); OrGate S ( s1, s2, s ); OrGate C ( c1, c2, c ); endmodule
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module NotGate ( a, b ); output b; input a; nand (b, a, a); endmodule
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module AndGate ( a, b, c ); output c; input a, b; wire x; nand (x, a, b); nand (c, x, x); endmodule
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module OrGate ( a, b, c ); output c; input a, b; wire x, y; nand (x, a, a); nand (y, b, b); nand (c, x, y); endmodule
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module XorGate ( a, b, c ); output c; input a, b; wire a_, b_, x, y; NotGate Na ( a, a_ ); NotGate Nb ( b, b_ ); AndGate A1 ( a, b_, x ); AndGate A2 ( a_, b, y ); OrGate O ( x, y, c ); endmodule
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module Inc4Bit ( a, b ); output [3:0] b; input [3:0] a; wire [3:0] c; HalfAdder H1 ( a[0], 1'b1, b[0], c[0] ); HalfAdder H2 ( a[1], c[0], b[1], c[1] ); HalfAdder H3 ( a[2], c[1], b[2], c[2] ); HalfAdder H4 ( a[3], c[2], b[3], c[3] ); endmodule
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module StimInc4Bit; wire [3:0] o; reg [3:0] a; integer i; Inc4Bit IOut ( a, o ); initial begin for (i = 0; i < 16; i = i + 1) begin a = i; #10; end end endmodule
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module NotGate ( a, b ); output b; input a; nand (b, a, a); endmodule
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module AndGate ( a, b, c ); output c; input a, b; wire x; nand (x, a, b); nand (c, x, x); endmodule
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module OrGate ( a, b, c ); output c; input a, b; wire x, y; nand (x, a, a); nand (y, b, b); nand (c, x, y); endmodule
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module XorGate ( a, b, c ); output c; input a, b; wire a_, b_, x, y; NotGate Na ( a, a_ ); NotGate Nb ( b, b_ ); AndGate A1 ( a, b_, x ); AndGate A2 ( a_, b, y ); OrGate O ( x, y, c ); endmodule
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module Add4Bit ( a, b, s ); output [3:0] s; input [3:0] a, b; wire [3:0] c; FullAdder F1 ( a[0], b[0], 1'b0, s[0], c[0] ); FullAdder F2 ( a[1], b[1], c[0], s[1], c[1] ); FullAdder F3 ( a[2], b[2], c[1], s[2], c[2] ); FullAdder F4 ( a[3], b[3], c[2], s[3], c[3] ); endmodule
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module NotGate ( a, b ); output b; input a; nand (b, a, a); endmodule
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module AndGate ( a, b, c ); output c; input a, b; wire x; nand (x, a, b); nand (c, x, x); endmodule
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module OrGate ( a, b, c ); output c; input a, b; wire x, y; nand (x, a, a); nand (y, b, b); nand (c, x, y); endmodule
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module XorGate ( a, b, c ); output c; input a, b; wire a_, b_, x, y; NotGate Na ( a, a_ ); NotGate Nb ( b, b_ ); AndGate A1 ( a, b_, x ); AndGate A2 ( a_, b, y ); OrGate O ( x, y, c ); endmodule
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module FullAdder ( a, b, c0, s, c ); output s, c; input a, b, c0; wire c_, x, x_, y, y_; NotGate N ( c0, c_ ); XorGate X1 ( a, b, x ); XnorGate X2 ( a, b, x_ ); AndGate A ( a, b, y ); OrGate O ( a, b, y_ ); AndGate As1 ( x, c_, s1 ); AndGate As2 ( x_, c0, s2 ); AndGate Ac1 ( y, c_, c1 ); AndGate Ac2 ( y_, c0, c2 ); OrGate S ( s1, s2, s ); OrGate C ( c1, c2, c ); endmodule
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module StimAdd16Bit; wire [15:0] o; reg [15:0] a, b; Add16Bit A ( a, b, o ); initial begin a = 15; b = 15; #10; a = 15; b = 0; #10; a = 0; b = 15; #10; a = 0; b = 0; #10; a = 962; b = 626; #10; a = 936; b = 772; #10; a = 485; b = 727; #10; a = 836; b = 753; #10; end endmodule
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module NotGate ( a, b ); output b; input a; nand (b, a, a); endmodule
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module AndGate ( a, b, c ); output c; input a, b; wire x; nand (x, a, b); nand (c, x, x); endmodule
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module OrGate ( a, b, c ); output c; input a, b; wire x, y; nand (x, a, a); nand (y, b, b); nand (c, x, y); endmodule
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module XorGate ( a, b, c ); output c; input a, b; wire a_, b_, x, y; NotGate Na ( a, a_ ); NotGate Nb ( b, b_ ); AndGate A1 ( a, b_, x ); AndGate A2 ( a_, b, y ); OrGate O ( x, y, c ); endmodule
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module StimInc16Bit; wire [15:0] o; reg [15:0] a; integer i; Inc16Bit IOut ( a, o ); initial begin for (i = 0; i < 65535; i = i + 1051) begin a = i; #10; end end endmodule
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module NotGate ( a, b ); output b; input a; nand (b, a, a); endmodule
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module Neg16 ( a, b ); output [15:0] b; input [15:0] a; NotGate N[15:0] ( a, b ); endmodule
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module StimNeg16; wire [15:0] o; reg [15:0] a; Neg16 N ( a, o ); initial begin a = 151; #10; a = 1251; #10; a = 38563; #10; a = 47251; #10; a = 12845; #10; a = 8221; #10; a = 3732; #10; a = 1754; #10; end endmodule
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module NotGate ( a, b ); output b; input a; nand (b, a, a); endmodule
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module AndGate ( a, b, c ); output c; input a, b; wire x; nand (x, a, b); nand (c, x, x); endmodule
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module OrGate ( a, b, c ); output c; input a, b; wire x, y; nand (x, a, a); nand (y, b, b); nand (c, x, y); endmodule
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module XorGate ( a, b, c ); output c; input a, b; wire a_, b_, x, y; NotGate Na ( a, a_ ); NotGate Nb ( b, b_ ); AndGate A1 ( a, b_, x ); AndGate A2 ( a_, b, y ); OrGate O ( x, y, c ); endmodule
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module FullAdder ( a, b, c0, s, c ); output s, c; input a, b, c0; wire c_, x, x_, y, y_; NotGate N ( c0, c_ ); XorGate X1 ( a, b, x ); XnorGate X2 ( a, b, x_ ); AndGate A ( a, b, y ); OrGate O ( a, b, y_ ); AndGate As1 ( x, c_, s1 ); AndGate As2 ( x_, c0, s2 ); AndGate Ac1 ( y, c_, c1 ); AndGate Ac2 ( y_, c0, c2 ); OrGate S ( s1, s2, s ); OrGate C ( c1, c2, c ); endmodule
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module Neg16 ( a, b ); output [15:0] b; input [15:0] a; NotGate N[15:0] ( a, b ); endmodule
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module Mux2x1 ( a, b, s, o ); output o; input a, b, s; wire s_, x, y; NotGate Ns ( s, s_ ); AndGate Aa ( s_, a, x ); AndGate Ab ( s, b, y ); OrGate O ( x, y, o ); endmodule
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module AndGate16w1 ( a, b, c ); output [15:0] c; input [15:0] a; input b; AndGate A[15:0] ( a, b, c ); endmodule
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module AndGate16 ( a, b, c ); output [15:0] c; input [15:0] a, b; AndGate A[15:0] ( a, b, c ); endmodule
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module ALU ( x, y, zx, nx, zy, ny, f, no, zr, ng, o ); output [15:0] o; output zr, ng; input [15:0] x, y; input zx, nx, zy, ny, f, no; wire [15:0] xz, yz, xn, yn, sm, an, to; wire zx_, zy_; NotGate Nnx ( zx, zx_ ); NotGate Nny ( zy, zy_ ); AndGate16w1 Zx ( x, zx_, xz ); AndGate16w1 Zy ( y, zy_, yz ); XorGate16w1 Nx ( xz, nx, xn ); XorGate16w1 Ny ( yz, ny, yn ); Add16Bit Asm ( xn, yn, sm ); AndGate16 Aan ( xn, yn, an ); Mux16b2x1 Fout ( an, sm, f, to ); XorGate16w1 No ( to, no, o ); AndGate Ang ( o[15], o[15], ng ); Nor16In Nzr ( o, zr ); endmodule
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module NotGate ( a, b ); output b; input a; nand (b, a, a); endmodule
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module AndGate ( a, b, c ); output c; input a, b; wire x; nand (x, a, b); nand (c, x, x); endmodule
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module OrGate ( a, b, c ); output c; input a, b; wire x, y; nand (x, a, a); nand (y, b, b); nand (c, x, y); endmodule
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module Mux2x1 ( a, b, s, c ); output c; input a, b, s; wire x, y, z; NotGate NG_1 ( s, z ); AndGate AG_1 ( a, z, x ); AndGate AG_2 ( b, s, y ); OrGate OG_1 ( x, y, c ); endmodule
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module DLatch ( d, c, q, q_ ); output q, q_; input d, c; wire c_, s, r, x, y; AndGate S ( d, d, s ); NotGate R ( d, r ); nand (x, c, s); nand (y, c, r); nand (q, q_, x); nand (q_, q, y); endmodule
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module DFlipFlopRE ( d, c, q, q_ ); output q, q_; input d, c; wire c_, Q, Q_; NotGate C_ ( c, c_ ); DLatch D1 ( d, c_, Q, Q_ ); DLatch D2 ( Q, c, q, q_ ); endmodule
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module StimDFlipFlopRE; wire q, q_; reg d, c; DFlipFlopRE D ( d, c, q, q_ ); initial begin c = 1'b1; end always begin c = ~c; #3; end initial begin d = 1'b0; #10; d = 1'b1; #10; d = 1'b0; #10; d = 1'b1; #10; end endmodule
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module NotGate ( a, b ); output b; input a; nand (b, a, a); endmodule
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module AndGate ( a, b, c ); output c; input a, b; wire x; nand (x, a, b); nand (c, x, x); endmodule
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module OrGate ( a, b, c ); output c; input a, b; wire x, y; nand (x, a, a); nand (y, b, b); nand (c, x, y); endmodule
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module Mux2x1 ( a, b, s, c ); output c; input a, b, s; wire x, y, z; NotGate NG_1 ( s, z ); AndGate AG_1 ( a, z, x ); AndGate AG_2 ( b, s, y ); OrGate OG_1 ( x, y, c ); endmodule
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module DLatch ( d, c, q, q_ ); output q, q_; input d, c; wire c_, s, r, x, y; AndGate S ( d, d, s ); NotGate R ( d, r ); nand (x, c, s); nand (y, c, r); nand (q, q_, x); nand (q_, q, y); endmodule
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module DFlipFlopRE ( d, c, q, q_ ); output q, q_; input d, c; wire c_, Q, Q_; NotGate C_ ( c, c_ ); DLatch D1 ( d, c_, Q, Q_ ); DLatch D2 ( Q, c, q, q_ ); endmodule
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module DFlipFlopRESReset ( d, c, q, q_, re ); output q, q_; input d, c, re; wire re_, d_; NotGate Re ( re, re_ ); AndGate A ( d, re_, d_ ); DFlipFlopRE Df ( d_, c, q, q_ ); endmodule
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module StimDFlipFlopRESReset; wire q, q_; reg d, c, re; DFlipFlopRESReset D ( d, c, q, q_, re ); initial begin c = 1'b1; end always begin c = ~c; #3; end initial begin d = 1'b0; re = 1'b0; #10; d = 1'b1; #5; re = 1'b1; #5; re = 1'b0; d = 1'b0; #10; d = 1'b1; #5; re = 1'b1; #5; end endmodule
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module NotGate ( a, b ); output b; input a; nand (b, a, a); endmodule
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module AndGate ( a, b, c ); output c; input a, b; wire x; nand (x, a, b); nand (c, x, x); endmodule
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module OrGate ( a, b, c ); output c; input a, b; wire x, y; nand (x, a, a); nand (y, b, b); nand (c, x, y); endmodule
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module Mux2x1 ( a, b, s, c ); output c; input a, b, s; wire x, y, z; NotGate NG_1 ( s, z ); AndGate AG_1 ( a, z, x ); AndGate AG_2 ( b, s, y ); OrGate OG_1 ( x, y, c ); endmodule
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module Nand3 ( a, b, c, o ); output o; input a, b, c; wire x, y; AndGate A ( a, b, x ); AndGate B ( x, c, y ); NotGate C ( y, o ); endmodule
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module DFlipFlopAResetHigh ( d, c, q, q_, re ); output q, q_; input d, c, re; wire re_, Q, Q_; NotGate R ( re, re_ ); NotGate N ( c, c_ ); DLatchWR D1 ( d, c_, Q, Q_, re_ ); DLatchWR D2 ( Q, c, q, q_, re_ ); endmodule
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module StimDFlipFlopAResetHigh; wire q, q_; reg d, c, re; DFlipFlopAResetHigh D ( d, c, q, q_, re ); initial begin c = 1'b1; end always begin c = ~c; #3; end initial begin d = 1'b0; re = 1'b0; #10; d = 1'b1; #5; re = 1'b1; #5; re = 1'b0; d = 1'b0; #10; d = 1'b1; #5; re = 1'b1; #5; end endmodule
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module NotGate ( a, b ); output b; input a; nand (b, a, a); endmodule
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module AndGate ( a, b, c ); output c; input a, b; wire x; nand (x, a, b); nand (c, x, x); endmodule
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module OrGate ( a, b, c ); output c; input a, b; wire x, y; nand (x, a, a); nand (y, b, b); nand (c, x, y); endmodule
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module Mux2x1 ( a, b, s, c ); output c; input a, b, s; wire x, y, z; NotGate NG_1 ( s, z ); AndGate AG_1 ( a, z, x ); AndGate AG_2 ( b, s, y ); OrGate OG_1 ( x, y, c ); endmodule
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module Nand3 ( a, b, c, o ); output o; input a, b, c; wire x, y; AndGate A ( a, b, x ); AndGate B ( x, c, y ); NotGate C ( y, o ); endmodule
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module DFlipFlopAResetLow ( d, c, q, q_, re ); output q, q_; input d, c, re; wire Q, Q_, c_; nand (c_, c, c); DLatchWR D1 ( d, c_, Q, Q_, re ); DLatchWR D2 ( Q, c, q, q_, re ); endmodule
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module StimDFlipFlopAResetLow; wire q, q_; reg d, c, re; DFlipFlopAResetLow D ( d, c, q, q_, re ); initial begin c = 1'b1; end always begin c = ~c; #3; end initial begin d = 1'b0; re = 1'b0; #10; d = 1'b1; #5; re = 1'b1; #5; re = 1'b0; d = 1'b0; #10; d = 1'b1; #5; re = 1'b1; #5; end endmodule
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module NotGate ( a, b ); output b; input a; nand (b, a, a); endmodule
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module AndGate ( a, b, c ); output c; input a, b; wire x; nand (x, a, b); nand (c, x, x); endmodule
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module OrGate ( a, b, c ); output c; input a, b; wire x, y; nand (x, a, a); nand (y, b, b); nand (c, x, y); endmodule
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module Mux2x1 ( a, b, s, c ); output c; input a, b, s; wire x, y, z; NotGate NG_1 ( s, z ); AndGate AG_1 ( a, z, x ); AndGate AG_2 ( b, s, y ); OrGate OG_1 ( x, y, c ); endmodule
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module DLatch ( d, c, q, q_ ); output q, q_; input d, c; wire c_, s, r, x, y; AndGate S ( d, d, s ); NotGate R ( d, r ); nand (x, c, s); nand (y, c, r); nand (q, q_, x); nand (q_, q, y); endmodule
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module DFlipFlopFE ( d, c, q, q_ ); output q, q_; input d, c; wire c_, Q, Q_; NotGate C_ ( c, c_ ); DLatch D1 ( d, c, Q, Q_ ); DLatch D2 ( Q, c_, q, q_ ); endmodule
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module StimDFlipFlopFE; wire q, q_; reg d, c; DFlipFlopFE D ( d, c, q, q_ ); initial begin c = 1'b1; end always begin c = ~c; #3; end initial begin d = 1'b0; #10; d = 1'b1; #10; d = 1'b0; #10; d = 1'b1; #10; end endmodule
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module NotGate ( a, b ); output b; input a; nand (b, a, a); endmodule
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module AndGate ( a, b, c ); output c; input a, b; wire x; nand (x, a, b); nand (c, x, x); endmodule
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module OrGate ( a, b, c ); output c; input a, b; wire x, y; nand (x, a, a); nand (y, b, b); nand (c, x, y); endmodule
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module Mux2x1 ( a, b, s, c ); output c; input a, b, s; wire x, y, z; NotGate NG_1 ( s, z ); AndGate AG_1 ( a, z, x ); AndGate AG_2 ( b, s, y ); OrGate OG_1 ( x, y, c ); endmodule
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module DLatch ( d, c, q, q_ ); output q, q_; input d, c; wire c_, s, r, x, y; AndGate S ( d, d, s ); NotGate R ( d, r ); nand (x, c, s); nand (y, c, r); nand (q, q_, x); nand (q_, q, y); endmodule
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module DFlipFlopFE ( d, c, q, q_ ); output q, q_; input d, c; wire c_, Q, Q_; NotGate C_ ( c, c_ ); DLatch D1 ( d, c, Q, Q_ ); DLatch D2 ( Q, c_, q, q_ ); endmodule
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module DFlipFlopFESReset ( d, c, q, q_, re ); output q, q_; input d, c, re; wire re_, d_; NotGate Re ( re, re_ ); AndGate A ( d, re_, d_ ); DFlipFlopFE Df ( d_, c, q, q_ ); endmodule
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module StimDFlipFlopFESReset; wire q, q_; reg d, c, re; DFlipFlopFESReset D ( d, c, q, q_, re ); initial begin c = 1'b1; end always begin c = ~c; #3; end initial begin d = 1'b0; re = 1'b0; #10; d = 1'b1; #5; re = 1'b1; #5; re = 1'b0; d = 1'b0; #10; d = 1'b1; #5; re = 1'b1; #5; end endmodule
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module NotGate ( a, b ); output b; input a; nand (b, a, a); endmodule
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