VHDL-8位CPU设计-包含程序.pdf

Computer Organization and Architecture Course Design The Experiment Report Of CPU I ? 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辻 s 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. At least four parts const辻 ute a simple CPU:the control unit, the internal registers, the ALU and instruction set, which are the main aspects of our project design and will be studied? II ? Instruction Set Single-address instruction format is used in our 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 memory location of the datum to be operated, we called itdirect addressing. In some instructions, the address part is the operand, which is calledimmediate addressing. For simplicity, the size of memory is 256X 16 in the computer. The instruction word has 16 bits. The 辻 opcode part has 8 bits and address part has 8 bs. The instruction word format can be expressed in Figure 1: OPCODE ADDRESS [15..0] [7..0] Figure 1 the instruction format The opcode of the relevant instructions are listed in Table 1. In Table 1, the notation [x] represents the contents of the location x in the