Design Of In-Circuit Emulator For The 65C02 MCU

In-Circuit Emulator is one of the most important component parts of Microcomputer Development Systems. It is an effective tool to develop the microcontroller systems. Therefore the research and design of the 65C02 In-Circuit Emulator have a very important significance that it can supply a developed tool in the design of the 65C02 microcontroller with independent intellectual property right.The capability of the In-Circuit Emulator is mostly determinded by its hardware. So the purpose of this paper is to design the hardware of the 65C02 In-Circuit Emulator, especially the control logic. Based on the basic operation principle of In-Circuit Emulator and the 6502MCU In-Circuit Emulator, this paper proposes the whole hardware structure of the 65C02 In-Circuit Emulator with the characteristic of 65C02. At the same time , this paper analyses the design of emulational functions,such as breakpoint, download, run, single-step, trace, registers and halt, and so on. Then we give a detailed introduction of the code design of the control logic applying RTL methodology and prove the validity and feasibility of the whole hardware structure of the 65C02 In-Circuit Emulator based on FPGA by function simulation, synthesis and test on Virtex- II Pro Development Platform.The innovations in this paper are as follows: 1. Designed the Verilog HDL source code and test Bench source code of the control logic applying RTL methodology with independent intellectual property right; 2. Designed the FSM adopting Moore type, one-hot coding and three always description, implemented the administration of all course of the ICE; 3. Implemented the breakpoint function adopting simulating injunction of software breakpoint, can set breakpoint to the program in ROM and EPROM; 4. Designed a new type of test by the Xilinx Virtex-ⅡPro Development Platform, ChipScope,and EDK, and implemented the board test of the control logic.