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調(diào)試系統(tǒng)的總體設(shè)計
在研究了OCD測試技術(shù)和M8051片上調(diào)試結(jié)構(gòu)OCI的基礎(chǔ)上，本文提出了M8051調(diào)試系統(tǒng)的總體設(shè)計方案。該方案通過USB接口與上位機通信，調(diào)試器主體由一個FPGA芯片實現(xiàn)。其總體結(jié)構(gòu)圖如圖3所示。
上位機運行調(diào)試軟件，將編譯器的各種調(diào)試操作，通過調(diào)試接口函數(shù)轉(zhuǎn)化為各種調(diào)試協(xié)議數(shù)據(jù)；再將這些調(diào)試協(xié)議數(shù)據(jù)通過底層通信模塊發(fā)送給 M8051調(diào)試器。本設(shè)計的底層通信接口是USB接口。編譯器選擇應用最為廣泛的且具備開放調(diào)試接口函數(shù)AGDI的Keil C51編譯器。
M8051 調(diào)試器本身主要由USB控制器模塊、8051處理器和JTAG控制器模塊組成。USH控制器在8051處理器的控制下接收來自上位機的調(diào)試協(xié)議數(shù)據(jù)；JTAG控制器模塊負責將這些調(diào)試協(xié)議數(shù)據(jù)轉(zhuǎn)化為基于OCI結(jié)構(gòu)的底層調(diào)試命令集，并以JTAG邊界掃描鏈讀寫時序發(fā)送出來。
M8051目標機通過OCI模塊的JTAG接口，接收M8051調(diào)試器發(fā)送的底層調(diào)試命令，完成對M8051目標機的調(diào)試，并將返回值通過JTAG接口送回M8051調(diào)試器。
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