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Clearnote
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Senior High
TVET Professional Subjects
有解析但還是看不懂怎麼分配的
TVET Professional Subjects
Senior High
11 monthsago
魚
有解析但還是看不懂怎麼分配的
4. 圖 (3) 為使用 74LS138 進行位址解碼工作。請分析 ROM0 位址分配空間。 74LS138 ROMO Yo- CSO A14- A Y₁ b A15- B Y2 A16 C Y3 þ M/IO G₁ YAP A17 G2A Y5 A18 G2B Y6 ROM7 A19 Y7P CST ~ ROM7的 圖 (3) 74LS138 之(G1、G2A、G2A)=(1,0,0)才能動作,由電路可知,(4ı9、 Aı8、47) = (1,1,0)。再由(4.6、A15、414)輸入(C、B、A)決定選擇到的 ROM,分析如下表所示。 位址線 A19~416 415~A12 Au~As A~A A3-A0 位址範圍 ROMO 110 000 XX XXXX XXXX XXXX C0000H-C3FFFH ROM1 110 0 01 XX XXXX XXXX XXXX C4000H-C7FFFH ROM2 110010 XX XXXX XXXX XXXX C8000H-CBFFFH ROM3 ROM4 110 100 XX 1100 11 XX XXXX XXXX XXXX XXXX XXXX XXXX ROM5 110 1 01 XX XXXX XXXX XXXX CC000H-CFFFFH D0000H-D3FFFH D4000H-D47FFFH ROM6 110 110 XX XXXX XXXX ROM7 110 1 11 XX XXXX XXXX XXXX XXXX D8000H-DBFFFH DC000H-DFFFFH
高職
資電類
微處理機
ch2
微處理機硬體架構
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