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鎮ㄥソ锛屾杩庝締(l谩i)鍒扮董搴�(k霉)闆诲瓙甯傚牬(ch菐ng)缍�(w菐ng) 鐧婚寗 | 鍏嶈不(f猫i)娉ㄥ唺(c猫)

8259A涓柗鎺у埗鍣�
闁辫畝锛�7061鏅�(sh铆)闁擄細2018-03-22 09:03:12

8259A鑺墖鏄竴鍊�(g猫)涓柗绠＄悊鑺墖锛屼腑鏂风殑渚�(l谩i)婧愰櫎浜嗕締(l谩i)鑷簬纭欢鑷韩鐨凬MI涓柗鍜屼締(l谩i)鑷簬杌熶欢鐨処NT n鎸囦护閫犳垚鐨勮粺浠朵腑鏂蜂箣澶栵紝閭勬湁渚�(l谩i)鑷簬澶栭儴纭欢瑷�(sh猫)鍌欑殑涓柗锛岄�欎簺涓柗鏄彲灞忚斀鐨勩�傞�欎簺涓柗涔熼兘閫氶亷(gu貌)鍙法绋嬩腑鏂锋帶鍒跺櫒PIC(Programmable Interrupt Controller)閫�(j矛n)琛屾帶鍒�锛屽苟鍌抽仦绲PU銆�

宸ヤ綔鍘熺悊

銆�銆�鐣�(d膩ng)涓�鍊�(g猫)涓柗璜�(q菒ng)姹傚緸IR0鍒癐R7涓殑鏌愭牴绶氬埌閬�(d谩)IMR鏅�(sh铆)锛孖MR棣栧厛鍒ゆ柗姝R鏄惁琚睆钄�锛屽鏋滆灞忚斀锛屽墖姝や腑鏂疯珛(q菒ng)姹傝涓熸锛涘惁鍓囷紝鍓囧皣鍏舵斁鍏RR涓�銆�
銆�銆�鍦ㄦ涓柗璜�(q菒ng)姹備笉鑳介��(j矛n)琛屼笅涓�姝ヨ檿鐞嗕箣鍓嶏紝瀹冧竴鐩磋鏀惧湪IRR涓�銆備竴鏃︾櫦(f膩)鐝�(xi脿n)铏曠悊涓柗鐨勬檪(sh铆)姗�(j墨)宸插埌锛孭riority Resolver灏囧緸鎵�鏈夎鏀剧疆浜嶪RR涓殑涓柗涓寫閬稿嚭涓�鍊�(g猫)鍎�(y艒u)鍏堢礆(j铆)鐨勪腑鏂凤紝灏囧叾鍌抽仦绲PU鍘昏檿鐞�銆侷R铏�(h脿o)瓒婁綆鐨勪腑鏂峰劒(y艒u)鍏堢礆(j铆)鍒ヨ秺楂�锛屾瘮濡侷R0鐨勫劒(y艒u)鍏堢礆(j铆)鍒ユ槸鐨�銆�
銆�銆�8259A閫氶亷(gu貌)鐧�(f膩)閫佷竴鍊�(g猫)INTR(Interrupt Request锛変俊铏�(h脿o)绲PU锛岄�氱煡CPU鏈変竴鍊�(g猫)涓柗鍒伴仈(d谩)銆侰PU鏀跺埌閫欏��(g猫)淇¤櫉(h脿o)鍚�锛屾渻(hu矛)鏆仠鍩�(zh铆)琛屼笅涓�姊濇寚浠�锛岀劧鍚庣櫦(f膩)閫佷竴鍊�(g猫)INTA(Interrupt Acknowledge锛変俊铏�(h脿o)绲�8259A銆�8259A鏀跺埌閫欏��(g猫)淇¤櫉(h脿o)涔嬪悗锛岄Μ涓婂皣ISR涓皪(du矛)鎳�(y墨ng)姝や腑鏂疯珛(q菒ng)姹傜殑Bit瑷�(sh猫)缃�锛屽悓鏅�(sh铆)IRR涓浉鎳�(y墨ng)鐨刡it鏈�(hu矛)琚玶eset銆傛瘮濡�锛屽鏋滅暥(d膩ng)鍓嶇殑涓柗璜�(q菒ng)姹傛槸IR3鐨勮┍锛岄偅涔圛SR涓殑bit-3灏辨渻(hu矛)琚ō(sh猫)缃�锛孖RR涓璉R3灏�(du矛)鎳�(y墨ng)鐨刡it灏辨渻(hu矛)琚玶eset銆傞�欒〃绀烘涓柗璜�(q菒ng)姹傛鍦ㄨCPU铏曠悊锛岃�屼笉鏄鍦ㄧ瓑寰匔PU铏曠悊銆�
銆�銆�闅ㄥ悗锛孋PU鏈�(hu矛)鍐嶆鐧�(f膩)閫佷竴鍊�(g猫)INTA淇¤櫉(h脿o)绲�8259A锛岃姹傚畠鍛婅ùCPU姝や腑鏂疯珛(q菒ng)姹傜殑涓柗鍚戦噺鏄粈涔�锛岄�欐槸涓�鍊�(g猫)寰�0鍒�255鐨勪竴鍊�(g猫)鏁�(sh霉)銆�8259A鏍规摎(j霉)琚ō(sh猫)缃殑璧峰鍚戦噺铏�(h脿o)锛堣捣濮嬪悜閲忚櫉(h脿o)閫氶亷(gu貌)涓柗鎺у埗瀛桰CW2琚垵濮嬪寲锛夊姞涓婁腑鏂疯珛(q菒ng)姹傝櫉(h脿o)瑷�(j矛)绠楀嚭涓柗鍚戦噺铏�(h脿o)锛屽苟灏囧叾鏀剧疆鍦―ata Bus涓娿�傛瘮濡傝鍒濆鍖栫殑璧峰鍚戦噺铏�(h脿o)鐐�8锛岀暥(d膩ng)鍓嶇殑涓柗璜�(q菒ng)姹傜偤IR3锛屽墖瑷�(j矛)绠楀嚭鐨勪腑鏂峰悜閲忕偤8+3=11銆�
銆�銆�CPU寰濪ata Bus涓婂緱鍒伴�欏��(g猫)涓柗鍚戦噺涔嬪悗锛屽氨鍘籌DT涓壘鍒扮浉鎳�(y墨ng)鐨勪腑鏂锋湇鍕�(w霉)绋嬪簭ISR锛屽苟瑾�(di脿o)鐢ㄥ畠銆傚鏋�8259A鐨凟nd of Interrupt (EOI锛夐�氱煡琚ō(sh猫)瀹氫綅浜哄伐妯″紡锛岄偅涔堢暥(d膩ng)ISR铏曠悊瀹岃┎铏曠悊鐨勪簨鎯呬箣鍚�锛屾噳(y墨ng)瑭茬櫦(f膩)閫佷竴鍊�(g猫)EOI绲�8259A銆�
銆�銆�8259A寰楀埌EOI閫氱煡涔嬪悗锛孖SR瀵勫瓨鍣ㄤ腑灏�(du矛)鎳�(y墨ng)浜庢涓柗璜�(q菒ng)姹傜殑Bit鏈�(hu矛)琚玆eset銆�
銆�銆�濡傛灉8259A鐨凟nd of Interrupt (EOI锛夐�氱煡琚ō(sh猫)瀹氫綅鑷嫊(d貌ng)妯″紡锛岄偅涔堝湪绗�2鍊�(g猫)INTA淇¤櫉(h脿o)鏀跺埌鍚�锛�8259A ISR瀵勫瓨鍣ㄤ腑灏�(du矛)鎳�(y墨ng)浜庢涓柗璜�(q菒ng)姹傜殑Bit灏辨渻(hu矛)琚玆eset銆�
銆�銆�鍦ㄦ鏈熼枔锛屽鏋滃張鏈夋柊鐨勪腑鏂疯珛(q菒ng)姹傚埌閬�(d谩)锛屽苟琚斁缃簬IRR涓�锛屽鏋滈�欎簺鏂扮殑涓柗璜�(q菒ng)姹備腑鏈夋瘮鍦↖SR瀵勫瓨涓斁缃殑鎵�鏈変腑鏂峰劒(y艒u)鍏堢礆(j铆)鍒ラ倓楂樼殑瑭�锛岄偅涔堥�欎簺楂樺劒(y艒u)鍏堢礆(j铆)鍒ョ殑涓柗璜�(q菒ng)姹傚皣鏈�(hu矛)琚Μ涓婃寜鐓т笂杩伴亷(gu貌)绋嬮��(j矛n)琛岃檿鐞嗭紱鍚﹀墖锛岄�欎簺涓柗灏囨渻(hu矛)琚斁鍦↖RR涓紝鐩村埌ISR涓珮鍎�(y艒u)鍏堢礆(j铆)鍒ョ殑涓柗琚檿鐞嗙祼(ji茅)鏉�锛屼篃灏辨槸瑾�(shu艒)鐭ラ亾ISR瀵勫瓨鍣ㄤ腑楂樺劒(y艒u)鍏堢礆(j铆)鍒ョ殑bit琚玆eset鐐烘銆�

浠嬬垂

銆�銆�涓�鍊�(g猫)8259A鑺墖鐨勫彲浠ユ帴鏈�澶�8鍊�(g猫)涓柗婧�锛屼絾鐢变簬鍙互灏�2鍊�(g猫)鎴栧鍊�(g猫)8259A鑺墖绱�(j铆)閫ｏ紙cascade锛�锛屽苟涓旀渶澶氬彲浠ョ礆(j铆)閫ｅ埌9鍊�(g猫)锛屾墍浠ユ渶澶氬彲浠ユ帴64鍊�(g猫)涓柗婧�銆傚浠婄禃澶у鏁�(sh霉)鐨凱C閮芥搧鏈夊叐鍊�(g猫)8259A锛岄�欐ǎ 鏈�澶氬彲浠ユ帴鏀�15鍊�(g猫)涓柗婧愩��
銆�銆�閫氶亷(gu貌)8259A鍙互灏�(du矛)鍠��(g猫)涓柗婧愰��(j矛n)琛屽睆钄�銆�
銆�銆�鍦ㄤ竴鍊�(g猫)8259A鑺墖鏈夊涓嬪咕鍊�(g猫)鍏�(n猫i)閮ㄥ瘎瀛樺櫒
銆�銆�Interrupt Mask Register (IMR)銆�
銆�銆�Interrupt Request Register (IRR锛�銆�
銆�銆�In Service Register (ISR锛�銆�
銆�銆�IMR琚敤浣滈亷(gu貌)婵捐灞忚斀鐨勪腑鏂�锛孖RR琚敤浣滄毇鏅�(sh铆)鏀剧疆鏈閫�(j矛n)涓�姝ヨ檿鐞嗙殑Interrupt锛岀暥(d膩ng)涓�鍊�(g猫)Interrupt姝ｅ湪琚獵PU铏曠悊鏅�(sh铆)锛屾涓柗琚斁缃湪ISR涓�銆�
銆�銆�闄や簡閫欏咕鍊�(g猫)瀵勫瓨鍣ㄤ箣澶�锛�8259A閭勬湁涓�鍊�(g猫)鍠厓鍙仛Priority Resolver锛岀暥(d膩ng)澶氬��(g猫)涓柗鍚屾檪(sh铆)鐧�(f膩)鐢熸檪(sh铆)锛孭riority Resolver鏍规摎(j霉)瀹冨�戠殑鍎�(y艒u)鍏堢礆(j铆)锛屽皣楂樺劒(y艒u)鍏堢礆(j铆)鑰呭劒(y艒u)鍏堝偝閬炵郸CPU銆�

鑺墖鐨勭法绋�

銆�銆�姣忎竴鍊�(g猫)8259A鑺墖閮芥湁鍏╁��(g猫)I/O ports锛岀▼搴忓摗鍙互閫氶亷(gu貌)瀹冨�戝皪(du矛)8259A閫�(j矛n)琛岀法绋�銆�
銆�銆�Master 8259A鐨勭鍙ｅ湴鍧�鏄�0x20锛�0x21锛汼lave 8259A鐨勭鍙ｅ湴鍧�鏄�0xA0锛�0xA1銆�
銆�銆�8259As鐨勫彛浠�
銆�銆�绋嬪簭鍝″彲浠ュ悜8259A瀵�(xi臎)鍏╃ó鍛戒护瀛楋細
銆�銆�Initialization Command Word (ICW锛�锛涢�欑ó鍛戒护瀛楄鐢ㄤ綔灏�(du矛)8259A鑺墖鐨勫垵濮嬪寲銆�
銆�銆�Operation Command Word (OCW锛夛細閫欑ó鍛戒护琚敤渚�(l谩i)鍚�8259A鐧�(f膩)甯冨懡浠�锛屼互灏�(du矛)鍏堕��(j矛n)琛屾帶鍒�銆侽CW鍙互鍦�8259A琚垵濮嬪寲涔嬪悗鐨勪换浣曟檪(sh铆)鍊欒浣跨敤銆�
銆�銆�8259A涓荤墖
銆�銆�涓嬭〃鐨勫収(n猫i)瀹规槸Master 8259A鐨処/O绔彛鍦板潃锛屼互鍙婇�氶亷(gu貌)瀹冨�戞墍鑳芥搷浣滅殑瀵勫瓨鍣�銆�
銆�銆�Address Read/Write Function
銆�銆�0x20 Write Initialization Command Word 1 (ICW1锛�
銆�銆�Write Operation Command Word 2 (OCW2锛�
銆�銆�Write Operation Command Word 3 (OCW3锛�
銆�銆�Read Interrupt Request Register (IRR)
銆�銆�Read In-Service Register (ISR)
銆�銆�0x21 Write Initialization Command Word 2 (ICW2锛�
銆�銆�Write Initialization Command Word 3 (ICW3锛�
銆�銆�Write Initialization Command Word 4 (ICW4锛�
銆�銆�Read/Write Interrupt Mask Register (IMR)
銆�銆�Addresses/Registers for Master 8259A
銆�銆�8259A寰炵墖
銆�銆�涓嬪収(n猫i)瀹规槸Slave 8259A鐨処/O绔彛鍦板潃锛屼互鍙婇�氶亷(gu貌)瀹冨�戞墍鑳芥搷浣滅殑瀵勫瓨鍣�銆�
銆�銆�Address Read/Write Function
銆�銆�0xA0 Write Initialization Command Word 1 (ICW1锛�
銆�銆�Write Operation Command Word 2 (OCW2锛�
銆�銆�Write Operation Command Word 3 (OCW3锛�
銆�銆�Read Interrupt Request Register (IRR)
銆�銆�Read In-Service Register (ISR)
銆�銆�0xA1 Write Initialization Command Word 2 (ICW2锛�
銆�銆�Write Initialization Command Word 3 (ICW3锛�
銆�銆�Write Initialization Command Word 4 (ICW4锛�
銆�銆�Read/Write Interrupt Mask Register (IMR)
銆�銆�Addresses/Registers for Slave 8259A
銆�銆�鐢变簬8259A鑺墖涓嶅儏鑳藉鐢ㄤ簬IBM PC/X86锛屼篃鍙互琚敤浣淢CS-80/85锛屽皪(du矛)浜庨�欏叐鑰�锛屽湪鎿嶄綔妯″紡涓婃湁涓�浜涗笉涓�妯ｏ紝灏�(du矛)浜庢煇浜涘瘎瀛樺櫒鐨勮ō(sh猫)缃篃鏈夋墍涓嶅悓銆傛垜鍊戝悗闈㈠儏鍍呰◣璜朮86妯″紡鐩搁棞(gu膩n)鐨勫収(n猫i)瀹广��

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