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Computer Organization and Architecture
Course Design
Microprogrammed CPU Design
School of Information Science and Engineering
Southeast University
2012-04-07
CONTENTS
1. Purpose 2
2. Tasks 2
2.1 Instruction Set 2
Table 1 List of instructions and relevant opcodes
2.2 Internal Registers and Memory 3
2.3 ALU 3
Table 2 ALU Operations
2.4 Microprogrammed Control Unit 4
Table 3 The meaning of each bit of the microinstruction
Table 4 The Sequence of Microinstructions(appendix)
Table 5 The meaning of each bit of the 8-bit flag.
3. Top-Level Structure 6
3.1 Symbols of internal registers ,ALU,CU and memory 6
3.2 Top-Level Structure of CPU 7
4. The Simulation Input Waveforms 10
5. Test 9
Test problem 1: test LOAD, STORE, AND, SHR, SHL, SAR, SAL 9
Table 7 Test of program of problem 1
Test problem 2: test SUB, ADD, JMPGEZ, HALT 11
Table 8 Test of program to calculate 1+2+……100
Test problem 3: test JMP,MPY, OR,NOT 13
Table 9 Test of program to calculate （（543-800）3）OR（（543 +125））,not 543
6. Conclusions and Discussions 16
7. Appendix 17
Microprogrammed CPU Design
1. Purpose:
The purpose of this project is to design a simple CPU (Central Processing Unit). This CPU has basic instruction set, and we will utilize its instruction set to generate a very simple program to verify its performance. For simplicity, we will only consider the relationship among the CPU, registers, memory and instruction set. That is to say we only need consider the following items: Read/Write Registers, Read/Write Memory and Execute the instructions.
2. Tasks:
At least four parts constitute a simple CPU: the instruction set, the internal registers, the ALU and the control unit.
2.1 Instruction Set
Single-address instruction format is used in my simple CPU design. The instruction word contains two sections: the operation code (opcode), which defines the function of instructions (addition, subtraction, logic operations, etc.); the address part, in most instructions, the address part contains the memo
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