涓北澶у鏁板瓧鐢佃矾涓庨�昏緫璁捐瀹為獙鎶ュ憡
闄㈢郴
淇℃伅绉戝涓庢妧鏈闄?/p>
瀛﹀彿
涓撲笟
璁＄畻鏈虹瀛︾被
瀹為獙浜?/p>
3
銆佸疄楠岄鐩細
AU(Arithmetic Unit,
绠楁湳鍗曞厓锛夎璁°�?/p>
瀹為獙鍐呭锛?/p>
璁捐涓�涓崐鍔犲崐鍑忓櫒锛?/p>
杈撳叆涓?/p>
S
銆?/p>
A
銆?/p>
B,
鍏朵腑
S
涓哄姛鑳介�夋嫨鍙ｃ�?/p>
褰?/p>
S=0
鏃讹紝杈撳嚭
A+B
鍙婅繘浣嶏紱褰?/p>
S=1
鏃讹紝杈撳嚭
A-B
鍙婂�熶綅銆?/p>
S
杈撳叆
1
杈撳叆
2
杈撳嚭
Y
杩?/p>
/
鍊熶綅
Cn
0
A
B
A+B
杩涗綅
1
A
B
A-B
鍊熶綅
鍒╃敤涓夌鏂规硶瀹炵幇銆?/p>
锛?/p>
1
锛夊埄鐢ㄥ崱璇哄浘绠�鍖栧悗鍙娇鐢ㄩ棬鐢佃矾瀹炵幇銆?/p>
锛?/p>
2
锛変娇鐢?/p>
74LS138
瀹炵幇銆?/p>
锛?/p>
3
锛変娇鐢?/p>
74LS151
瀹炵幇锛?/p>
鍙垎涓ゆ鍗曠嫭璁板綍鍜?/p>
/
宸粨鏋溿�?/p>
杩涗綅鍊?/p>
浣嶇粨鏋滄垨浣跨敤涓ゅ潡
74LS151
瀹炵幇銆?/p>
瀹為獙鍒嗘瀽锛?/p>
鐪熷�艰〃
S
A
B
Y
Cn
0
0
0
0
0
0
0
1
1
0
0
1
0
1
0
0
1
1
0
1
1
0
0
0
0
1
0
1
1
1
1
1
0
1
0
1
1
1
0
0
鍗¤鍥撅細
S
AB
0
1
閫氳繃鍗¤鍥惧彲寰楋細
Y=
A
B+A
B
00
01
11
10
0
0
1
1
0
0
1
1