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module clk_div ( clk, clk_sel, clk_out ); input clk; input [3:0] clk_sel; output reg clk_out; reg [15:0] counter; reg [15:0] next_counter; always @(posedge clk) begin counter = next_counter; end always @* begin next_counter = counter + 1; case (clk_sel[3:0]) 0: clk_out ...
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module Complement_test; reg [3:0] D; wire [3:0] Q; Complement u1 ( D, Q ); initial begin #800 $finish; end initial begin D = 4'b0000; #100; D = 4'b0001; #50; D = 4'b0010; #50; D = 4'b0011; #50; D = 4'b0100; #50; D = 4'b0101; #50; ...
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module MUX_2to1_32bit ( input [31:0] IN1, input [31:0] IN2, output [31:0] OP, input CONTROL ); reg [31:0] OP_REG; always @(*) begin case (CONTROL) 1'b0: OP_REG = IN1; 1'b1: OP_REG = IN2; endcase end assign OP = OP_REG; endmodule
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module MUX_4to1_32bit ( input [31:0] IN1, input [31:0] IN2, input [31:0] IN3, input [31:0] IN4, output [31:0] OP, input [ 1:0] CONTROL ); reg [31:0] OP_REG; always @(*) begin case (CONTROL) 2'b00: OP_REG = IN1; 2'b01: OP_REG = IN2; 2'b10: OP_REG = IN3; 2'b1...
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module priority_decoder_1 (input wire [3:0] select, output reg [2:0] priority // "priority" is not a keyword ); // return bit number of highest bit set, or 7 if none set always @(select) begin casez (select) // synthesis full_case 4'b1???: priority = 4'h3; 4'b01??: priority = 4'h2; 4'b00...
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module FA ( input A, B, Cin, output S, Cout ); wire T0, T1, T2; xor3 X1 ( A, B, Cin, S ); and2 A1 ( A, B, T0 ); and2 A2 ( B, Cin, T1 ); and2 A3 ( Cin, A, T2 ); or3 O1 ( T0, T1, T2, ...
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module FS ( input Dec, input A, B, Cin, output Diff, Cout ); wire T0; xor2 A4 ( B, Dec, T0 ); FA d ( A, T0, Cin, Diff, Cout ); endmodule
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module FS_TB; wire t_s, t_cout, t_diff, t_cout1; reg t_a, t_b, t_cin, t_d; FS I1 ( .Dec(t_d), .A(t_a), .B(t_b), .Cin(t_cin), .Diff(t_diff), .Cout(t_cout1) ); initial begin $dumpfile("FS.vcd"); $dumpvars(0, FS_TB); end initial begin $monitor(t_a, t_b, t_c...
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module top_module ( input clk, input reset, // Synchronous active-high reset output [3:0] q ); always @(posedge clk) begin q <= (reset | q == 4'd9) ? 0 : q + 1; end endmodule
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module top_module ( input clk, input [7:0] d, output reg [7:0] q ); // Because q is a vector, this creates multiple DFFs. always @(posedge clk) q <= d; endmodule
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module top_module ( input a, b, cin, output cout, sum ); assign sum = a ^ b ^ cin; assign cout = a & b | a & cin | b & cin; endmodule
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module declaration syntax here: module top_module(clk, reset, in, out); input clk; input reset; // Synchronous reset to state B input in; output out;// reg out; // Fill in state name declarations reg present_state, next_state; always @(posedge clk) begin if (reset) begin ...
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module top_module ( output out ); assign out = 0; endmodule
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module top_module ( input a, input b, input c, input d, output out ); assign out = ~a & ~b & ~c | ~a & ~c & ~d | a & ~b & ~c | b & c & d | a & ~b & c & d | ~a & c & ~d; endmodule
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module top_module ( input [99:0] a, b, input sel, output [99:0] out ); assign out = sel ? b : a; endmodule
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module top_module ( input clk, input load, input [1:0] ena, input [99:0] data, output reg [99:0] q ); always @(posedge clk) begin if (load) begin q <= data; end else begin if (ena == 2'b01) begin q <= {q[0], q[99:1]}; end else if (ena == 2'b10) begin q <=...
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module top_module ( input clk, input load, input [511:0] data, output [511:0] q ); always @(posedge clk) begin if (load) q <= data; else begin q <= q ^ {q << 1} | ({~(q >> 1)} & q & {q << 1}); end end endmodule
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module top_module ( input [99:0] a, b, input sel, output [99:0] out ); assign out = (sel == 0 ? a : b); endmodule
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module top_module ( input a, b, sel, output out ); always @(*) begin if (sel == 1'b0) begin out = a; end else begin out = b; end end endmodule
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module top_module ( input in, output out ); assign out = in; endmodule
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module top_module ( input a, b, c, output w, x, y, z ); assign w = a; assign x = b; assign y = b; assign z = c; endmodule
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module top_module ( input in, output out ); assign out = ~in; endmodule
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module top_module ( input a, input b, output out ); assign out = a & b; endmodule
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module top_module ( input a, input b, output out ); assign out = ~(a | b); endmodule
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module top_module ( input a, input b, output out ); assign out = ~a ^ b; endmodule
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module top_module ( input a, input b, input c, input d, output out, output out_n ); wire in1, in2; assign in1 = a & b; assign in2 = c & d; assign out = in1 | in2; assign out_n = ~(in1 | in2); endmodule
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module top_module ( input p1a, p1b, p1c, p1d, p1e, p1f, output p1y, input p2a, p2b, p2c, p2d, output p2y ); assign p1y = (p1a & p1b & p1c) | (p1d & p1e & p1f); assign p2y = (p2a & p2b) | (p2d & p2c); endmodule
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module top_module ( input wire [2:0] vec, output wire [2:0] outv, output wire o2, output wire o1, output wire o0 ); // Module body starts after module declaration assign outv = vec; assign o2 = vec[2]; assign o1 = vec[1]; assign o0 = vec[0]; endmodule
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module top_module ( input wire [15:0] in, output wire [ 7:0] out_hi, output wire [ 7:0] out_lo ); assign {out_hi, out_lo} = in; endmodule
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module top_module ( input [31:0] in, output [31:0] out ); // assign {out[7:0], out[15:8], out[23:16], out[31:24]} = in; endmodule
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module top_module ( input [2:0] a, input [2:0] b, output [2:0] out_or_bitwise, output out_or_logical, output [5:0] out_not ); assign out_or_bitwise = a | b; assign out_or_logical = a || b; assign out_not[2:0] = ~a; // Part-select on left side is o. assign out_not[5:3] = ~b; //Assigni...
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module top_module ( input [3:0] in, output out_and, output out_or, output out_xor ); assign out_and = in[0] & in[1] & in[2] & in[3]; assign out_or = in[0] | in[1] | in[2] | in[3]; assign out_xor = in[0] ^ in[1] ^ in[2] ^ in[3]; endmodule
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module top_module ( input [4:0] a, b, c, d, e, f, output [7:0] w, x, y, z ); // assign w = {a[4:0], b[4:2]}; assign x = {b[1:0], c[4:0], d[4]}; assign y = {d[3:0], e[4:1]}; assign z = {e[0], f[4:0], 2'b11}; endmodule
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module top_module ( input [7:0] in, output [7:0] out ); assign out[7:0] = {in[0], in[1], in[2], in[3], in[4], in[5], in[6], in[7]}; /* // I know you're dying to know how to use a loop to do this: // Create a combinational always block. This creates combinational logic that computes the same result // ...
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module top_module ( input [ 7:0] in, output [31:0] out ); // assign out = {{24{in[7]}}, {in}}; endmodule
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module top_module ( input a, b, c, d, e, output [24:0] out ); // wire [4:0] k = {a, b, c, d, e}; assign out[24:20] = ~{5{a}} ^ k; assign out[19:15] = ~{5{b}} ^ k; assign out[14:10] = ~{5{c}} ^ k; assign out[9:5] = ~{5{d}} ^ k; assign out[4:0] = ~{5{e}} ^ k; endmodule
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module top_module ( input a, input b, output out ); // Create an instance of "mod_a" named "inst1", and connect ports by name: mod_a inst1 ( .in1(a), // Port"in1"connects to wire "a" .in2(b), // Port "in2" connects to wire "b" .out(out) // Port "out" connects to wire "out" ...
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module top_module ( input a, input b, input c, input d, output out1, output out2 ); mod_a aa ( out1, out2, a, b, c, d ); endmodule
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module top_module ( input a, input b, input c, input d, output out1, output out2 ); mod_a aaaa ( .out1(out1), .out2(out2), .in1 (a), .in2 (b), .in3 (c), .in4 (d) ); endmodule
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module top_module ( input clk, input d, output q ); wire q1, q2; my_dff d1 ( clk, d, q1 ); my_dff d2 ( clk, q1, q2 ); my_dff d3 ( clk, q2, q ); endmodule
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module top_module ( input clk, input [7:0] d, input [1:0] sel, output reg [7:0] q ); wire [7:0] o1, o2, o3; // output of each my_dff8 // Instantiate three my_dff8s my_dff8 d1 ( clk, d, o1 ); my_dff8 d2 ( clk, o1, o2 ); my_dff8 d3 ( clk, o2...
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module top_module ( input [31:0] a, input [31:0] b, output [31:0] sum ); wire con1, con2; add16 adder_1 ( a[15:0], b[15:0], 0, sum[15:0], con1 ); add16 adder_2 ( a[31:16], b[31:16], con1, sum[31:16], con2 ); endmodule
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module top_module ( input [31:0] a, input [31:0] b, output [31:0] sum ); // wire con1, con2; add16 adder_1 ( a[15:0], b[15:0], 0, sum[15:0], con1 ); add16 adder_2 ( a[31:16], b[31:16], con1, sum[31:16], con2 ); endmodule
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module add1 ( input a, input b, input cin, output sum, output cout ); assign sum = a ^ b ^ cin; assign cout = a & b | a & cin | b & cin; endmodule
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module top_module ( input [31:0] a, input [31:0] b, output [31:0] sum ); wire cout1, cout2a, cout2b; wire [15:0] sum2a, sum2b; add16 add1 ( a[15:0], b[15:0], 0, sum[15:0], cout1 ); add16 add2a ( a[31:16], b[31:16], 0, sum2a, cout2a );...
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module top_module ( input [31:0] a, input [31:0] b, input sub, output [31:0] sum ); wire cout, cout2; wire [31:0] b_in; assign b_in = b ^ {32{sub}}; add16 a1 ( a[15:0], b_in[15:0], sub, sum[15:0], cout ); add16 a2 ( a[31:16], b_in[31:16], cout,...
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module top_module ( input a, input b, output wire out_assign, output reg out_alwaysblock ); assign out_assign = a & b; always @(*) out_alwaysblock = a & b; endmodule
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module top_module ( input clk, input a, input b, output wire out_assign, output reg out_always_comb, output reg out_always_ff ); assign out_assign = a ^ b; always @(*) out_always_comb = a ^ b; always @(posedge clk) out_always_ff <= a ^ b; endmodule
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module top_module ( input a, input b, input sel_b1, input sel_b2, output wire out_assign, output reg out_always ); assign out_assign = (sel_b1 & sel_b2) ? b : a; always @(*) begin if (sel_b1 & sel_b2) begin out_always = b; end else begin out_always = a; end end en...
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module top_module ( input cpu_overheated, output reg shut_off_computer, input arrived, input gas_tank_empty, output reg keep_driving ); // always @(*) begin if (cpu_overheated) shut_off_computer = 1; end always @(*) begin if (~arrived) keep_driving = ~gas_tank_empty; ...
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module top_module ( input [2:0] sel, input [3:0] data0, input [3:0] data1, input [3:0] data2, input [3:0] data3, input [3:0] data4, input [3:0] data5, output reg [3:0] out ); // always @(*) begin // This is a combinational circuit case (sel) 3'b000: out = data0; 3'b...
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module top_module ( input [3:0] in, output reg [1:0] pos ); always @(*) begin pos = (in[0] & 1) ? 2'd0 : (in[1] & 1) ? 2'd1 : (in[2] & 1) ? 2'd2 : (in[3] & 1) ? 2'd3 : 2'd0; end endmodule
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module top_module ( input [7:0] in, output reg [2:0] pos ); // casez treats bits that have the value z as don't-care in the comparison. //Notice how there are certain inputs (e.g., 4'b1111) that will match more than one case item. //The first match is chosen (so 4'b1111 matches the first item, out = 0,...
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module top_module ( input [15:0] scancode, output reg left, output reg down, output reg right, output reg up ); always @(*) begin up = 1'b0; down = 1'b0; left = 1'b0; right = 1'b0; case (scancode) 16'he06b: left = 1'b1; 16'he072: down = 1'b1; 16'he074: right ...
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module top_module ( input [7:0] a, b, c, d, output [7:0] min ); // wire [7:0] min1 = (a < b) ? a : b; wire [7:0] min2 = (c < d) ? c : d; assign min = (min1 < min2) ? min1 : min2; endmodule
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module top_module ( input [7:0] in, output parity ); assign parity = ^in; endmodule
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module top_module ( input [99:0] in, output out_and, output out_or, output out_xor ); assign {out_and, out_or, out_xor} = {&in, |in, ^in}; endmodule
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module top_module ( input [99:0] in, output [99:0] out ); integer i; always @(in) begin for (i = 0; i < 100; i++) begin out[i] = in[99-i]; end end endmodule
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module top_module ( input [254:0] in, output reg [7:0] out ); always @(*) begin // Combinational always block out = 0; for (int i = 0; i < 255; i++) out = out + in[i]; end endmodule
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module top_module ( input [99:0] a, b, input cin, output [99:0] cout, output [99:0] sum ); integer i; always @(*) begin sum[0] = a[0] ^ b[0] ^ cin; cout[0] = a[0] & b[0] | cin & (a[0] | b[0]); for (i = 1; i < 100; i++) begin sum[i] = a[i] ^ b[i] ^ cout[i-1]; cout[i] = ...
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module top_module ( input [399:0] a, b, input cin, output cout, output [399:0] sum ); wire [99:0] cout_wires; genvar i; generate bcd_fadd( a[3:0], b[3:0], cin, cout_wires[0], sum[3:0] ); for (i = 4; i < 400; i = i + 4) begin : bcd_adder_instances bcd_fadd bcd_adder ...
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module top_module ( input clk, input areset, // Freshly brainwashed Lemmings walk left. input bump_left, input bump_right, input ground, output reg walk_left, output reg walk_right, output reg aaah ); reg walk_temp[1:0]; initial begin walk_left = 1; walk_right = 0; aaah ...
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module top_module ( input a, input b, output out ); mod_a( .in1(a), .in2(b), .out(out) ); endmodule
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module top_module ( input a, input b, output out ); mod_a instance1 ( .in1(a), .in2(b), .out(out) ); endmodule
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module DECODER ( sel, out ); input [3:0] sel; output [15:0] out; reg [15:0] out; always @(sel) begin case (sel) 4'h0: out = 16'h8000; 4'h1: out = 16'h4000; 4'h2: out = 16'h2000; 4'h3: out = 16'h1000; 4'h4: out = 16'h0800; 4'h5: out = 16'h0400; 4'h6: out = 16...
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module MEMORY ( WE, DataToWrite, RegSel, ReadData ); input WE; input [7:0] DataToWrite; input [15:0] RegSel; output [7:0] ReadData; reg [7:0] ReadData; reg [7:0] Mem[0:15]; always @(WE or DataToWrite or RegSel) begin case (RegSel) 16'h8000: begin if (WE) Mem[4'h0] = DataT...
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module DATAPATH ( Num, Key, StoredValue ); input [3:0] Num, Key; output [7:0] StoredValue; reg clock, EN, WE; reg [3:0] sel; wire [3:0] RegOut, RotOut1, RotOut2; wire [ 7:0] Encrypt; wire [15:0] Addr; initial begin #0 clock = 1'b1; EN = 1'b1; WE = 1'b1; sel = 4'h8; end ...
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module top_module ( input [4:1] x, output f ); assign f = (~x[1]) & x[3] | (~x[2]) & (~x[4]) | x[1] & x[2] & x[3] & x[4]; endmodule
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module top_module ( input [5:0] y, input w, output Y1, output Y3 ); assign Y1 = y[0] & w; assign Y3 = y[1] & (~w) | y[2] & (~w) | y[4] & (~w) | y[5] & (~w); endmodule
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module top_module ( input clk, input reset, // synchronous reset input w, output z ); parameter a = 3'b000, b = 3'b001, c = 3'b010, d = 3'b011, e = 3'b100, f = 3'b101; reg [2:0] state, next_state; always @(*) begin case ({ state, w }) {a, 1'b0} : next_state = a; {a,...
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module top_module ( input clk, input resetn, // active-low synchronous reset input [3:1] r, // request output [3:1] g // grant ); parameter a = 2'd0, b = 2'd1, c = 2'd2, d = 2'd3; reg [1:0] state, next_state; always @(*) begin case (state) a: begin if (r[1]) next_state = b; ...
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module top_module ( input clk, input resetn, // active-low synchronous reset input x, input y, output reg f, output reg g ); parameter A=4'd0, f1=4'd1, tmp0=4'd2, tmp1=4'd3, tmp2=4'd4, g1=4'd5, g1p=4'd6, tmp3=4'd7, g0p=4'd8; reg [3:0] state, next_state; always @(*) begin case (state...
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module top_module ( input clk, input reset, // Synchronous reset input x, output z ); parameter y0 = 3'd0, y1 = 3'd1, y2 = 3'd2, y3 = 3'd3, y4 = 3'd4; reg [2:0] state, next_state; always @(*) begin case ({ state, x }) {y0, 1'b0} : next_state = y0; {y0, 1'b1} : next_s...
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module top_module ( input clk, input [2:0] y, input x, output Y0, output z ); reg [2:0] Y; always @(*) begin case ({ y, x }) 4'b0000: Y = 3'b000; 4'b0001: Y = 3'b001; 4'b0010: Y = 3'b001; 4'b0011: Y = 3'b100; 4'b0100: Y = 3'b010; 4'b0101: Y = 3...
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module top_module ( input clk, input reset, // Synchronous reset input s, input w, output z ); parameter a = 1'b0, b = 1'b1; reg state, next_state; reg [2:0] w3 = 0; reg [1:0] count = 0; always @(*) begin case ({ state, s }) {a, 1'b0} : next_state = a; {a, 1...
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module top_module ( input clk, input w, R, E, L, output Q ); wire out1, out2; always @(posedge clk) begin case (E) 1'b0: begin out1 = Q; end 1'b1: begin out1 = w; end endcase case (L) 1'b0: begin Q = out1; end 1'...
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module top_module ( input [3:0] SW, input [3:0] KEY, output [3:0] LEDR ); MUXDFF ins0 ( .clk(KEY[0]), .E (KEY[1]), .L (KEY[2]), .w (LEDR[1]), .R (SW[0]), .Q (LEDR[0]) ); MUXDFF ins1 ( .clk(KEY[0]), .E (KEY[1]), .L (KEY[2]), .w (LED...
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module cpu //Do not change top module name or ports. ( input clk, input areset, output [7:0] imem_addr, //Request instruction memory input [7:0] imem_data, //Returns output [7:0] tb_data //Testbench wiring. ); //Data memory and testbench wiring. you may rename them if you like. wire dmem_wr...
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module RegisterFile ( input CLK, input [1:0] ReadReg1, input [1:0] ReadReg2, input Write_enable, input [1:0] WriteReg, input [7:0] WriteData, input areset, output [7:0] ReadData1, output [7:0] ReadData2 ); reg [7:0] registers[3:0]; initial begin registers[0] <= 8'b00000000;...
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module SignExtensionUnit ( input [5:0] in, input Jump, output reg [7:0] out ); always @(*) begin if (Jump == 1'b1) begin out[5:0] <= in[5:0]; out[7:6] <= {2{in[5]}}; end else begin out[1:0] <= in[1:0]; out[7:2] <= {6{in[1]}}; end end endmodule
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module ALU ( input [1:0] opcode, input [7:0] ain, bin, output [7:0] result ); wire b_l; assign b_l = ~(bin) + 1; assign result = (opcode==2'b01) ? (ain+bin) : (opcode==2'b10) ? (ain-bin) : (bin[7]==1) ? (ain - (b_l)) : (ain+bin); endmodule
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module TwoBitMUX ( input control, input [1:0] in0, input [1:0] in1, output reg [1:0] out ); always @(control or in0 or in1) begin if (control == 0) begin out <= in0; end else begin out <= in1; end end endmodule
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module EightBitMUX ( input control, input [7:0] in0, input [7:0] in1, output reg [7:0] out ); always @(control or in0 or in1) begin if (control == 0) begin out <= in0; end else begin out <= in1; end end endmodule
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module EightBitAdder ( input [7:0] a, b, output [7:0] s ); assign s = a + b; endmodule
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module MUX_2x1 ( sel, in1, in2, out ); input sel, in1, in2; output out; assign out = (~sel & in1) | (sel & in2); endmodule
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module MUX_8x1 ( sel, in, out ); input [2:0] sel; input [7:0] in; output out; assign out = (sel[2] ? (sel[1] ? (sel[0] ? in[7] : in[6]) : (sel[0] ? in[5] : in[4])) : (sel[1] ? (sel[0] ? in[3] : in[2]) : (sel[0] ? in[1] : in[0]))); endmodule
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module COUNTER_3BIT ( Q, clock, clear ); output [2:0] Q; input clock, clear; reg [2:0] Q; initial Q = 3'b0; always @(posedge clock or posedge clear) begin if (clear) Q = 3'b0; else Q = (Q + 1) % 8; end endmodule
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module DECODER ( EN, A, B ); input EN; input [2:0] A; output [7:0] B; reg [7:0] B; always @(A) begin if (EN == 0) B = 8'b00000000; else begin case (A) 3'b000: B = 8'b00000001; 3'b001: B = 8'b00000010; 3'b010: B = 8'b00000100; 3'b011: B = 8'b00001000;...
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module MEMORY ( S, G ); input [2:0] S; output [7:0] G; reg [7:0] mem[0:7]; reg [7:0] G; //Initialize the memory initial begin mem[0] = 8'b00000001; //2'h01; mem[1] = 8'b00000011; //2'h03; mem[2] = 8'b00000111; //2'h07; mem[3] = 8'b00001111; //2'h0F; mem[4] = 8'b00011111; /...
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module TOP_MODULE ( clock, clear, S, EN, OUT ); input clock, clear, EN; input [2:0] S; output OUT; wire [2:0] Q; wire [7:0] B, G, E; MUX_8x1 M8 ( Q, E, OUT ); MUX_ARRAY MA ( G, B, E ); COUNTER_3BIT CNTR3 ( Q, clock, clear ...
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module parity ( A, B, C, I, P ); //Inputs input A; input B; input C; input I; //Outputs output P; //Components wire w1; wire w2; xor g1 (w1, A, B); xor g2 (w2, w1, C); xor g3 (P, I, w2); endmodule
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module parity_tb; //Inputs as registers reg A; reg B; reg C; reg I; //Ouputs as wires wire P; //Initialiastion parity uut ( A, B, C, I, P ); initial begin $dumpfile("2019AAPS0331H_tb.vcd"); $dumpvars(0, parity_tb); // Uncomment a paritcular sequenc...
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module top ( key, //按键输入 rst, //复位输入 led //led输出 ); input key, rst; output reg led; always @(key or rst) if (!rst) //复位时led熄灭 led = 1; else if (key == 0) led = ~led; //按键按下时led翻转 else led = led; endmodule
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module LockedBox ( Key1, Key2, Key3, Key4, LED, Button1, Button2, Seg_Led ); //输入端口 //四个拨杆开关 用于输入密码 input Key1; input Key2; input Key3; input Key4; //两个按钮 用于确认两重密码正确性 input Button1; input Button2; //输出端口 两个LED灯 代表打开与否 一个七段数码管 代表是否解锁 output [1:0] LED; output [8:0]...
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module PGU20 ( a, b, p, g ); input [19:0] a, b; output [19:0] p, g; assign p = a ^ b; assign g = a & b; endmodule
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module D1_20bit ( in, clk, out ); input [19:0] in; input clk; output reg [19:0] out; always @(posedge clk) begin out <= in; end endmodule
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module SU20 ( p, cin, c, s ); input [19:0] p; input cin; input [18:0] c; output [19:0] s; assign s = p ^ {c, cin}; endmodule
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module DD5_3bit ( in, clk, out ); input [2:0] in; input clk; output reg [2:0] out; reg [2:0] r_data[0:3]; always @(posedge clk) begin r_data[0] <= in; r_data[1] <= r_data[0]; r_data[2] <= r_data[1]; r_data[3] <= r_data[2]; out <= r_data[3]; end endmodule
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module DD5_20bit ( in, clk, out ); input [19:0] in; input clk; output reg [19:0] out; reg [19:0] r_data[0:3]; always @(posedge clk) begin r_data[0] <= in; r_data[1] <= r_data[0]; r_data[2] <= r_data[1]; r_data[3] <= r_data[2]; out <= r_data[3]; end endmodule
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module DD4_4bit ( in, clk, out ); input [3:0] in; input clk; output reg [3:0] out; reg [3:0] r_data[0:2]; always @(posedge clk) begin r_data[0] <= in; r_data[1] <= r_data[0]; r_data[2] <= r_data[1]; out <= r_data[2]; end endmodule
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