除法器的verilog简单实现

haidaowang · 发表于 2020-6-5 15:20

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引言
两年前，我写过一个简单的除法器，当时由于时间问题，只实现了一个简单的逻辑电路，但是实际中大多都是时序的，所以后面给出了修改意见，但是并没有进行进一步的测试，最近发现那个简单的除法器引起了很多讨论，本小节就做一个终结。

1，RTL编码
a，div_rill.v

/*
* module:div_rill
* file name:div_rill.v
* syn:yes
* author:rill
* date:2014-04-10
*/

module div_rill
(
input clk,
input rst,

input enable,
input [31:0] a,
input [31:0] b,

output reg [31:0] yshang,
output reg [31:0] yyushu,

output reg done
);

reg[31:0] tempa;
reg[31:0] tempb;
reg[63:0] temp_a;
reg[63:0] temp_b;

reg [5:0] status;
parameter s_idle = 6'b000000;
parameter s_init = 6'b000001;
parameter s_calc1 = 6'b000010;
parameter s_calc2 = 6'b000100;
parameter s_done = 6'b001000;

reg [31:0] i;

always @(posedge clk)
begin
if(rst)
begin
i <= 32'h0;
tempa <= 32'h1;
tempb <= 32'h1;
yshang <= 32'h1;
yyushu <= 32'h1;
done <= 1'b0;
status <= s_idle;
end
else
begin
case (status)
s_idle:
begin
if(enable)
begin
tempa <= a;
tempb <= b;

status <= s_init;
end
else
begin
i <= 32'h0;
tempa <= 32'h1;
tempb <= 32'h1;
yshang <= 32'h1;
yyushu <= 32'h1;
done <= 1'b0;

status <= s_idle;
end
end

s_init:
begin
temp_a = {32'h00000000,tempa};
temp_b = {tempb,32'h00000000};

status <= s_calc1;
end

s_calc1:
begin
if(i < 32)
begin
temp_a = {temp_a[62:0],1'b0};

status <= s_calc2;
end
else
begin
status <= s_done;
end

end

s_calc2:
begin
if(temp_a[63:32] >= tempb)
begin
temp_a = temp_a - temp_b + 1'b1;
end
else
begin
temp_a = temp_a;
end
i <= i + 1'b1;
status <= s_calc1;
end

s_done:
begin
yshang <= temp_a[31:0];
yyushu <= temp_a[63:32];
done <= 1'b1;

status <= s_idle;
end

default:
begin
status <= s_idle;
end
endcase
end

end

endmodule

/*************** EOF ******************/

b,div_rill_tb.v

/*
* module:div_rill_tb
* file name:div_rill_tb.v
* syn:no
* author:rill
* date:2014-04-10
*/

`timescale 1ns/1ns

module div_rill_tb;

reg clk;
reg rst;
reg enable;

reg [31:0] a;
reg [31:0] b;
wire [31:0] yshang;
wire [31:0] yyushu;

wire done;

initial
begin
clk = 0;

#10
rst = 1;
#20
rst = 0;

#15
enable =1;
a = 2;//$random()%10000;
b = 7;//$random()%1000;
#10
enable =0;

#1000
enable =1;
a = 7;//$random()%1000;
b = 2;//$random()%100;
#10
enable =0;

#1000
enable =1;
a = 7;//$random()%100;
b = 7;//$random()%10;
#10
enable =0;

#1000 $stop;
end

always # 5 clk = ~clk;

div_rill DIV_RILL
(
.clk (clk),
.rst (rst),

.enable (enable),
.a (a),
.b (b),

.yshang (yshang),
.yyushu (yyushu),

.done (done)
);

endmodule
/******** EOF ******************/

2,，验证结果

NingW · 发表于 2020-6-8 17:03

除法器的verilog简单实现

SsaaM7 · 发表于 2020-6-5 16:22

除法器的verilog简单实现

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