Experiment 1 CPU Instruction arithmetic unit design

• The experiment purpose

1. master QuartusII And other experimental tools 、 comprehensive 、 Simulation 、 How to use the download
2. master DE2 The functional characteristics and application methods of the developed version of the device
3. master Verilog HDL The main methods and techniques of combinational logic system design
4. Master and apply the design method and process

• Preview requirements

1. understand QuartusII Equal Discipline Distribution 、 Download method and process
2. Understand the input of development board 、 The output shows the working characteristics of the resource
3. Understand development board design 、 Development and testing methods and processes

• The experimental requirements

Design a simple CPU Instruction arithmetic unit , The command format is as follows .

Operation type 1

Operands 1

Operation type 2

Operands 3

Operands 4

The specific functions completed are defined as follows ：

1. Operation type 1： The operands 1 As an unsigned binary number , In the seven segment tube, the binary sequence equivalent value is displayed in decimal system .
2. Operation type 2： Implement operands 3、 Operands 4 Add between 、 reduce 、 Multiply operation , In the seven section pipe with ten / Hexadecimal Displays operands and results . Operands 3 and 4 by BCD Code means 2 A decimal number （ The value is 00-99）.

Be careful ：

1. Operation type 2 in , Negative numbers in subtraction logic , Is displayed “-”, Positive numbers can not display symbols
2. Operation type 2 in , Add 、 reduce 、 Multiplication operands and results are displayed in decimal , It can be realized by cyclic display on the seven section tube .
3. Note the operands 3、4 With BCD Code input , exceed 9 Of BCD Code output processing problem .
4. Try the addition operation, which is realized by pipeline . Pay attention to the number of significant digits .
5. If you feel that the display ability of seven segment tube is weak , You can query LCD1602 Control module code , use LCD Show .

1. First plug the board into the computer （ Black line power supply , White line computer ）

2. In the start setting board , choice Cyclone IV E, Then select the voltage below 1.2V The can

3. After completing the configuration of the board , Enter the main file code ：

module zhiling(key,x2,x3,Hex0,Hex1,Hex2,Hex3,Hex4,Hex5,Hex6,Hex7,x);
input [7:0] x2,x3;
input key;
reg[7:0] x1;
input [1:0] x;// Indicates the display mode of the seven section tube 
output reg[6:0] Hex0,Hex1,Hex2,Hex3,Hex4,Hex5,Hex6,Hex7;
reg[11:0] add;
reg[7:0] sub;
reg[13:0] mul;
wire[7:0] n3,n2;
integer flag;// Symbol sign bit 
// Additive variable 
reg cout1,cout2;
reg [6:0] fh;
reg [3:0] low,low0,mid,mid0;
reg [3:0] a1,a2,a3,a4;// Multiplication, you express 
reg [3:0] t1,t2,t3;//x1 Value 
reg [3:0] s1,s2;
assign n2=x2[7:4]*10+x2[3:0];
assign n3=x3[7:4]*10+x3[3:0];
always@(*)
begin
   if(key==1)
	begin
   x1=x2;	
   t1=x1%4'b1010;
	t2=x1/4'b1010%4'b1010;
	t3=x1/4'b1010/4'b1010;
	end
end
// Add , Two stage pipeline mode 
always@(*)
begin
{cout1,low0}=x2[3:0]+x3[3:0];
if(cout1==1) begin low=low0+4'b0110; end
else if(low0>9&&cout1==0) begin {cout1,low}=low0+4'b0110;end
else begin low=low0;cout1=0;end
end

always@(*)
begin
{cout2,mid0}=x2[7:4]+x3[7:4]+cout1;
if(cout2==1) begin mid=mid0+4'b0110; end
else if(mid0>9&&cout2==0) begin {cout2,mid}=mid0+4'b0110;end
else begin mid=mid0;cout2=0;end
add={cout2,mid,low};
end
// Subtraction 
always@(*)
begin
flag=0;
if(n2>=n3) sub=n2-n3;
else begin flag=1;sub=n3-n2;end
fh=(flag==1)?7'b0111111:7'b1111111;
   s1=sub%4'b1010;  
	s2=sub/4'b1010;
end
// Multiplication 
always@(*)
begin
   mul=n2*n3;
   a1=mul%4'b1010;  
	a2=mul/4'b1010%4'b1010;
	a3=mul/4'b1010/4'b1010%4'b1010;
	a4=mul/4'b1010/4'b1010/4'b1010;
end

always@(x)
begin
case(x)
2'b00:begin {Hex2,Hex1,Hex0}={show(t3),show(t2),show(t1)};Hex3=7'b1111111;Hex4=7'b1111111;Hex5=7'b1111111;Hex6=7'b1111111;Hex7=7'b1111111;end
2'b01:begin {Hex7,Hex6}={show(x2[7:4]),show(x2[3:0])};{Hex5,Hex4}={show(x3[7:4]),show(x3[3:0])};
				{Hex2,Hex1,Hex0}={show(add[11:8]),show(add[7:4]),show(add[3:0])};Hex3=7'b1111111;  end
2'b10:begin {Hex7,Hex6}={show(x2[7:4]),show(x2[3:0])};{Hex5,Hex4}={show(x3[7:4]),show(x3[3:0])};
				{Hex2,Hex1,Hex0}={fh,show(s2),show(s1)};Hex3=7'b1111111;  end
2'b11:begin {Hex7,Hex6}={show(x2[7:4]),show(x2[3:0])};{Hex5,Hex4}={show(x3[7:4]),show(x3[3:0])};
				{Hex3,Hex2,Hex1,Hex0}={show(a4),show(a3),show(a2),show(a1)};  end
endcase
end

function [6:0]show;
   input[3:0] a0;
	reg[6:0] b;
	begin
	case(a0)
  4'd0:b=7'b1000000;
  4'd1:b=7'b1111001;
  4'd2:b=7'b0100100;
  4'd3:b=7'b0110000;
  4'd4:b=7'b0011001;
  4'd5:b=7'b0010010;
  4'd6:b=7'b0000010;
  4'd7:b=7'b1111000;  
  4'd8:b=7'b0000000;
  4'd9:b=7'b0011000; 
default:b=7'b1111111;
	endcase 
	show=b;
	end
	endfunction
endmodule

4. Click on import assignment

5. Import pin assignment , Data set download link of Experiment 1 ：

fpga Hardware Experiment 1 CPU Instruction arithmetic unit design pin configuration - Dataset document class resources -CSDN download

6. Then open Pin Planner, Check whether the pins are connected normally  

7.first The interface defined by the module corresponds to the pin allocation file . After importing the pin assignment file , see pin planner Connection of middle pin . If a blank line appears , Description pin file error , Need modification , Re import .（ It has been tested , If you use the above link to import pins , Normal operation , This step can be omitted ）

8. If the pin assignment file is modified , You need to remove the imported pin file ,remove assignments. Reopen pin planer You will find that the connection is clear , All lines become colorless .（ It has been tested , If you use the above link to import pins , Normal operation , This step can be omitted ）

 9. Import the pin assignment table correctly , After no mistakes . Re integrate the whole project

10. Integrated , After no mistakes . Connect the development board , Turn on the power , Ready to download .

stay programmer window , Maybe as shown in the box no hardware, No hardware . Click on hardware setup function . eject hardware setup window , Add hardware .

11. If there is no USB drive , Manual operation is required Update driver

Right click “ My computer ” Icon , choice “ management ”

12. choice “ Manual search ”, Get into Quartus prime Install catalog file , find “USB”

13. Two “USB” Just choose one （ Then in the hardware 115 Just choose one from the socket of the board ）

14. After installation , that will do

15.  After completing the driver update , Click again on the Programmer window , Click on hardware setup function . eject hardware setup window , Add hardware

16. Click... To finish the configuration Start that will do

Then start the hardware test , Experiment one is CPU Instruction arithmetic unit , The operation of addition, subtraction and multiplication

Multiplication ：

Add ：

Subtraction ：