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廈門(mén)泰尼電氣有限公司
主營(yíng)產(chǎn)品： AB模塊PLC |
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廈門(mén)泰尼電氣有限公司
主營(yíng)產(chǎn)品： AB模塊PLC |
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更新時(shí)間：2018-03-20 06:53:10瀏覽次數(shù)：300
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1746-P7 1746-P7
1746-P7 1746-P7
存儲(chǔ)器由存儲(chǔ)體、地址譯碼器和控制電路組成。
1)存儲(chǔ)體是存儲(chǔ)數(shù)據(jù)信息的載體。由一系列存儲(chǔ)單元組成，每個(gè)存儲(chǔ)單元都有確定的地址。存儲(chǔ)單元通常按字節(jié)編址，一個(gè)存儲(chǔ)單元為一個(gè)字節(jié)，每個(gè)字節(jié)能存放一個(gè)8位二進(jìn)制數(shù)。就像一個(gè)大倉(cāng)庫(kù)，分成許多房間，大倉(cāng)庫(kù)相當(dāng)于存儲(chǔ)體，房間相當(dāng)于字節(jié)，房間都有編號(hào)，編號(hào)就是地址。
：張亮（工程師） 專(zhuān)線：
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2)地址譯碼器將CPU發(fā)出的地址信號(hào)轉(zhuǎn)換為對(duì)存儲(chǔ)體中某一存儲(chǔ)單元的選通信號(hào)。相當(dāng)于CPU給出地址，地址譯碼器找出相應(yīng)地址房間的鑰匙。通常地址是8位或1 6位，輸入到地址譯碼器，產(chǎn)生相應(yīng)的選通線，8位地址能產(chǎn)生28=256根選通線，即能選通256字節(jié)。16位地址能產(chǎn)生216=65536=64K根選通線，即能選通64K字節(jié)。當(dāng)然要產(chǎn)生65536根選通線是很難想象的，實(shí)際上它是分成256根行線和256根列線，256 X 256=65536，合起來(lái)能選通65536個(gè)存儲(chǔ)單元。
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