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1747-L542/1747-L542
典型的OCD調(diào)試系統(tǒng)
目前，嵌入式調(diào)試領(lǐng)域的趨勢是在MCU上集成一個專門用于調(diào)試的功能模塊，并且提供一個專用接口開放給用戶。用戶通過該調(diào)試控制模塊來實現(xiàn)停止／繼續(xù)CPU 的運行，并訪問目標(biāo)機(jī)上的各種資源，這就是OCD（On-Chip Debug，片上調(diào)試）技術(shù)。同時，JTAG作為應(yīng)用最廣泛的系統(tǒng)級測試技術(shù)，控制邏輯簡單、實現(xiàn)方便，常作為片上調(diào)試模塊的測試接口。
一個完整的OCD調(diào)試系統(tǒng)通常包括調(diào)試主機(jī)、調(diào)試協(xié)議轉(zhuǎn)換器（或調(diào)試器）、目標(biāo)機(jī)三個部分。調(diào)試主機(jī)運行調(diào)試軟件，并通過調(diào)試器與目標(biāo)機(jī)相連；調(diào)試器將主機(jī)發(fā)出的調(diào)試命令和數(shù)據(jù)轉(zhuǎn)換為基于目標(biāo)機(jī)OCD模塊和JTAG接口的調(diào)試數(shù)據(jù)；目標(biāo)機(jī)的OCD模塊接收到調(diào)試器發(fā)來的JTA G數(shù)據(jù)，完成對CPU的邏輯控制。典型的OCD調(diào)試系統(tǒng)如圖1所示。
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