GE V7768-312000
VME總線中斷
內(nèi)存交換網(wǎng)板有一個單獨的可編程VME總線中斷輸出,它可以用來觸發(fā)執(zhí)行一個邏輯塊。內(nèi)存交換網(wǎng)板能對不同的事件產(chǎn)生中斷，比如奇偶錯誤，信號監(jiān)測錯誤，或無賴數(shù)據(jù)包故障。完整的列表見4-3頁“VME總線中斷事件”。
如果你的應(yīng)用程序使用VME總線中斷，它必須向模板寫數(shù)數(shù)據(jù)來選擇中斷源，并且在它們發(fā)生時作出響應(yīng)。為了控制哪個事件會產(chǎn)生一個中斷，需要向本地中斷允許寄存器(LIER-區(qū)域2， 偏移14h) 寫數(shù)據(jù)。一旦中斷產(chǎn)生，邏輯必須讀取本地中斷允許寄存器(LER-區(qū)域2，偏移10h)來確定中斷產(chǎn)生的原因(可能不是一個)并且作出適當(dāng)?shù)捻憫?yīng)。
注意:如果CPU在停止模式下有VME中斷產(chǎn)生，相關(guān)的中斷塊不會因為中斷的產(chǎn)生而執(zhí)行。
以下是使用VME總線中斷過程中包含的一些步驟的總結(jié):
1.決定你想為哪個事件產(chǎn)生一個中斷。( 見“VME總線中斷事件”4-3頁)
2.開發(fā)中斷初始化邏輯。
3.開發(fā)中斷處理邏輯塊。
4.將模板硬件配置中中斷參數(shù)設(shè)為允許。
5.使中斷和邏輯塊相關(guān)聯(lián)。
6.下載并測試應(yīng)用程序。
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