简单计算机系统课程设计计算机组成实验C

1、计算机组成实验 C课程设计适用专业：电子信息类专业专业: * 班级: * 学号: * 姓名: * 指导教师 : * 实验学期 : 2014-2015第1学期西南交通大学信息科学与技术学院简化计算机系统的设计一. 实验目的：通过学习简单的指令系统及其各指令的操作流程，用 VHDL 语言实现简单的处理器模块， 并通过调用存储器模块， 将处理器模块和存储器模块连接形成简化的计算机系统。二. 实验内容1. 用 VHDL 语言实现简单的处理器模块。2. 调用存储器模块设计25616 的存储器模块。3. 将简单的处理器模块和存储器模块连接形成简单的计算机系统。4. 将指令序列存入存储器，然后分析指令执行流

2、程。三. 预习要求 ：1、学习简单指令集。 2、学习各指令的操作流程。四. 实验报告1. BLOCK 图图 1 原理图内存文件：图 2 内存文件 .Mif 2. 程序设计LIBRARY ieee; USE ieee.std_logic_1164.ALL; PACKAGE mypack IS CONSTANT idle : std_logic_vector(3 DOWNTO 0) :=0000; CONSTANT load : std_logic_vector(3 DOWNTO 0) :=0001; CONSTANT move : std_logic_vector(3 DOWNTO 0) :=0

3、010; CONSTANT addx : std_logic_vector(3 DOWNTO 0) :=0011; CONSTANT subp : std_logic_vector(3 DOWNTO 0) :=0100; CONSTANT andp : std_logic_vector(3 DOWNTO 0) :=0101; CONSTANT orp : std_logic_vector(3 DOWNTO 0) :=0110; CONSTANT xorp : std_logic_vector(3 DOWNTO 0) :=0111; CONSTANT shrp : std_logic_vecto

4、r(3 DOWNTO 0) :=1000; CONSTANT shlp : std_logic_vector(3 DOWNTO 0) :=1001; CONSTANT swap : std_logic_vector(3 DOWNTO 0) :=1010; CONSTANT jmp : std_logic_vector(3 DOWNTO 0) :=1011; CONSTANT jz : std_logic_vector(3 DOWNTO 0) :=1100; CONSTANT read : std_logic_vector(3 DOWNTO 0) :=1101; CONSTANT write :

5、 std_logic_vector(3 DOWNTO 0) :=1110; CONSTANT stop : std_logic_vector(3 DOWNTO 0) :=1111; END mypack; LIBRARY ieee; USE ieee.std_logic_1164.ALL; USE ieee.std_logic_unsigned.ALL; USE WORK.mypack.ALL; -cpu实体声明 - ENTITY cpu2 IS PORT( reset : IN std_logic; -清零信号低有效 clock : IN std_logic; -时钟信号 Write_Rea

6、d: OUT std_logic; -读写信号 ,1为写 M_address: OUT std_logic_vector(11 DOWNTO 0); -地址线 M_data_in: IN std_logic_vector(7 DOWNTO 0); -数据输入线 M_data_out: OUT std_logic_vector(7 DOWNTO 0); -数据输出线 overflow: OUT std_logic); - 溢出标志END cpu2; -cpuRTL级行为描述 - ARCHITECTURE RTL of cpu2 IS SIGNAL IR: std_logic_vector(15

7、DOWNTO 0); -指令寄存器 SIGNAL MDR: std_logic_vector(7 DOWNTO 0); -数据寄存器 SIGNAL MAR: std_logic_vector(11 DOWNTO 0); -地址寄存器 SIGNAL status: integer RANGE 0 TO 6; -状态寄存器 BEGIN status_change: PROCESS(reset, clock, status ) BEGIN IF reset = 0 THEN status status IF IR(15 DOWNTO 12) = Stop THEN status = 1; ELSE

8、status CASE IR(15 DOWNTO 12) IS WHEN Read|Write|Jmp|Jz|Swap = status status IF IR(15 DOWNTO 12)= Swap THEN status = 0; ELSE status status CASE IR(15 DOWNTO 12) IS WHEN Read|Write = status status status = 0; END CASE; ELSE NULL; END IF; END PROCESS status_change; seq: PROCESS(reset,clock) VARIABLE PC

9、:std_logic_vector(11 DOWNTO 0); - 程序计数器 VARIABLE R0,R1,R2,R3: std_logic_vector(7 DOWNTO 0); -通用寄存器 VARIABLE A: std_logic_vector(7 DOWNTO 0); -临时寄存器 VARIABLE temp: std_logic_vector(8 DOWNTO 0); -临时变量 BEGIN IF(reset=0) THEN - 清零 IR 0); PC := (OTHERS=0); R0 := (OTHERS=0); R1 := (OTHERS=0); R2 := (OTHER

10、S=0); R3 := (OTHERS=0); A := (OTHERS=0); MAR 0); MDR 0); ELSIF(clockevent AND clock=1) THEN overflow -状态 0 IR -状态 1 IF (IR(15 DOWNTO 12) /= stop) THEN MAR R0:= 0000 & IR(11 DOWNTO 8); WHEN shlp|shrp = CASE IR(11 DOWNTO 10) IS - Rx to A WHEN 00= A:= R0; WHEN 01= A:= R1; WHEN 10= A:= R2; WHEN OTHE

11、RS = A:= R3; END CASE; WHEN Move|addx|subp|andp|orp|xorp|Swap= CASE IR(9 DOWNTO 8) IS - Ry to A WHEN 00= A:=R0; WHEN 01= A:=R1; WHEN 10= A:=R2; WHEN OTHERS= A:=R3; END CASE; WHEN OTHERS = NULL; END CASE; WHEN 2= -状态 2 CASE IR(15 DOWNTO 12) IS WHEN addx = - Rx:= Rx + A; CASE IR(11 DOWNTO 10) IS WHEN

12、00= temp := (R0(7) & R0(7 DOWNTO 0) + (A(7) & A(7 DOWNTO 0); R0:=temp(7 DOWNTO 0); overflow temp :=(R1(7) & R1(7 DOWNTO 0) + (A(7) & A(7 DOWNTO 0); R1:=temp(7 DOWNTO 0); overflow temp :=(R2(7) & R2(7 DOWNTO 0) + (A(7) & A(7 DOWNTO 0); R2:=temp(7 DOWNTO 0); overflow temp :=(R3

13、(7) & R3(7 DOWNTO 0) + (A(7) & A(7 DOWNTO 0); R3:=temp(7 DOWNTO 0); overflow - Rx:= Rx - A; CASE IR(11 DOWNTO 10) IS WHEN 00= temp :=(R0(7) & R0(7 DOWNTO 0) + NOT(A(7) & A(7 DOWNTO 0) + 1; R0:=temp(7 DOWNTO 0); overflow temp :=(R1(7) & R1(7 DOWNTO 0) + NOT(A(7) & A(7 DOWNTO 0

14、) + 1; R1:=temp(7 DOWNTO 0); overflow temp :=(R2(7) & R2(7 DOWNTO 0) + NOT(A(7) & A(7 DOWNTO 0) + 1; R2:=temp(7 DOWNTO 0); overflow temp :=(R3(7) & R3(7 DOWNTO 0) + NOT(A(7) & A(7 DOWNTO 0) + 1; R3:=temp(7 DOWNTO 0); overflow CASE IR(11 DOWNTO 10) IS WHEN 00= R0:= A; WHEN 01= R1:= A;

15、 WHEN 10= R2:= A; WHEN OTHERS= R3:= A; END CASE; WHEN shrp = CASE IR(11 DOWNTO 10) IS WHEN 00= R0:= 0 & A( 7 DOWNTO 1 ); WHEN 01= R1:= 0 & A( 7 DOWNTO 1 ); WHEN 10= R2:= 0 & A( 7 DOWNTO 1 ); WHEN OTHERS= R3:= 0 & A( 7 DOWNTO 1 ); END CASE; WHEN shlp = CASE IR(11 DOWNTO 10) IS WHEN 00

16、= R0:= A( 6 DOWNTO 0 ) & 0; WHEN 01= R1:= A( 6 DOWNTO 0 ) & 0; WHEN 10= R2:= A( 6 DOWNTO 0 ) & 0; WHEN OTHERS= R3:= A( 6 DOWNTO 0 ) & 0; END CASE; WHEN andp = -Rx:= Rx AND A; CASE IR(11 DOWNTO 10) IS WHEN 00= R0:=R0 AND A; WHEN 01= R1:=R1 AND A; WHEN 10= R2:=R2 AND A; WHEN OTHERS= R3

17、:=R3 AND A; END CASE; WHEN orp = -Rx:= Rx OR A; CASE IR(11 DOWNTO 10) IS WHEN 00= R0:=R0 OR A; WHEN 01= R1:=R1 OR A; WHEN 10= R2:=R2 OR A; WHEN OTHERS= R3:=R3 OR A; END CASE; WHEN xorp = -Rx:= Rx XOR A; CASE IR(11 DOWNTO 10) IS WHEN 00= R0:=R0 XOR A; WHEN 01= R1:=R1 XOR A; WHEN 10= R2:=R2 XOR A; WHE

18、N OTHERS= R3:=R3 XOR A; END CASE; WHEN Swap = -Swap: Rx to Ry; CASE IR(11 DOWNTO 8) IS WHEN 0100= R0:=R1; WHEN 1000= R0:=R2; WHEN 1100= R0:=R3; WHEN 0001= R1:=R0; WHEN 1001= R1:=R2; WHEN 1101= R1:=R3; WHEN 0010= R2:=R0; WHEN 0110= R2:=R1; WHEN 1110= R2:=R3; WHEN 0111= R3:=R1; WHEN 1011= R3:=R2; WHEN

19、 0011= R3:=R0; WHEN OTHERS= NULL; END CASE; WHEN OTHERS = NULL; END CASE; WHEN 3= -状态 3 CASE IR(15 DOWNTO 12) IS WHEN Swap= - Swap: A to Rx CASE IR(11 DOWNTO 10) IS WHEN 00= R0:=A; WHEN 01= R1:=A; WHEN 10= R2:=A; WHEN OTHERS= R3:=A; END CASE; WHEN jmp|Jz|Read|Write = IR(7 DOWNTO 0) NULL; END CASE; WHEN 4= -状态 4 CASE IR(15 DOWNTO 12) IS WHEN jmp = - 无条件转移指令 PC := IR(11 DOWNTO 0); MAR - 条件转移指令 IF(R0=00000000) then PC := IR(11 DOWNTO 0); MAR = IR(11 DOWNTO 0); else MAR MAR MAR