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廈門泰尼電氣有限公司
主營產(chǎn)品： AB模塊PLC |
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廈門泰尼電氣有限公司
主營產(chǎn)品： AB模塊PLC |
| 參考價 | 面議 |
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更新時間：2018-03-20 06:53:10瀏覽次數(shù)：293
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1746-P7 1746-P7
1746-P7 1746-P7
存儲器由存儲體、地址譯碼器和控制電路組成。
1)存儲體是存儲數(shù)據(jù)信息的載體。由一系列存儲單元組成，每個存儲單元都有確定的地址。存儲單元通常按字節(jié)編址，一個存儲單元為一個字節(jié)，每個字節(jié)能存放一個8位二進(jìn)制數(shù)。就像一個大倉庫，分成許多房間，大倉庫相當(dāng)于存儲體，房間相當(dāng)于字節(jié)，房間都有編號，編號就是地址。
：張亮（工程師） 專線：
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2)地址譯碼器將CPU發(fā)出的地址信號轉(zhuǎn)換為對存儲體中某一存儲單元的選通信號。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，實際上它是分成256根行線和256根列線，256 X 256=65536，合起來能選通65536個存儲單元。
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U.S. MOTORS HWN2502V53XU182?TCNM SERIES 2000 GEAR REDUCE
McLEAN M52-0816-003E 8000 BTU 1 PHASE SIDE MOUNT AIR CO
KEBA TEACH PENDANT HT401/0V-4x20/1?K4/24135 BTC 05.1B-PN
