???(multiplexers)???????????????????????? - PowerPoint PPT Presentation

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???(multiplexers)????????????????????????

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Title: 1 Author: Last modified by: Jian-Hua Tong Created Date: 2/17/2003 1:45:06 PM Document presentation format: – PowerPoint PPT presentation

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Title: ???(multiplexers)????????????????????????


1
?????????
2
???
  • ???(multiplexers)????????????????????????

3
???
  • 16?1????????????????????,????????(data
    selector)?
  • Ex. ABCD0000?YD0ABCD1111?YD15

4
???
  • ?????OR??NOR,?????????????????
  • 74150-TTL???
  • ??(strobe)?????????(enable)???(disable)?
  • Ex. ABCD0111

5
???
  • Ex. 4-1 pp.193X?????STROBE?L?000000010010010
    001010110100010011010
  • Ex. 4-2 pp.193

6
?????
  • ??????????????????????
  • ????????74150??????

7
4?????
  • ??????4???????,???4?????(nibble multiplexer)?

8
4?????
  • 74157 IC

Active low!!
9
????
  • ????(demultiplexer)?????????????????????
  • 1?16????ABCD0000 ? Y0DABCD1111 ? Y15D

10
????
  • 74154 IC
  • DATA?????????????74154???????

11
????
  • Ex. 4-3 pp.198

12
4?16???
  • ???(decoder)????????????????,??????????ABCD?
  • ???4?16???(4-of-16 decoder),?????????????(binary-t
    o-decimal decoder)?ABCD0001 ? Y1H,
    OthersLABCD0100 ? Y4H, OthersL

13
4?16???
  • 74154 IC ?????????,????????-?????
  • ?74154?DATA??STROBE???????????
  • ??????,?????????,????????ABCD0111 ? Y7L,
    OthersH

14
5?32???
  • Ex. 4-4 pp.201????(chip expansion)XL
    ????,????XH ????,???? XABCD00011 ? ??Y3L,
    OthersHXABCD10011 ? ??Y3L, OthersH

15
BCD???????
  • BCD?(binary-coded decimal)???????????????4???
  • BCD??4?????,?0000?1001,??1010?1111???9,?????BCD???

16
BCD???????
  • 4?10???BCD???????ABCD0011? Y3H,
    OthersLABCD1000? Y8H, OthersL

17
BCD???????
  • 7445 IC

18
BCD???????
  • Ex. 4-5 pp.206
  • Ex. 4-6 pp.206a. ABCD0101b. ABCD1001c.
    ABCD1100

19
??????
  • LED?????????????
  • ??????????????????7?LED???0-9????
  • ????????LED???????????
  • ??????????????LED?VCC???

20
??????
  • 7446 IC????????,????????????
  • 7446????????
  • ????????4?????(BCD??)?7?????(a?g?)?ABCD0111???
    ??7

21
??????
  • 7448 IC????????,????????????
  • 7448???????

22
???
  • ???BCD???
  • ???(encoder)??????????????????????
  • ???5? ABCD0101

23
???
  • 74147 IC????BCD???X9L? ABCDLHHL
    9???X7L? ABCDHLLL
    7???
  • 7417????????(priority encoder)-?????????????????X
    9?X0

24
???
  • Ex. 4-7 pp.2146???? ABCDHLLH

25
????, XOR
  • ????(eXclusive-OR gate, XOR)
  • ???????????,????????
  • 2????????2?????????????

26
????, XOR
  • ???XOR?

???????????,????????
27
????, XOR
  • ???XOR?

???????????,????????
28
?????????
  • ???(even parity)n?????????1? ?110011, 1111
    0000 1111 0011???(odd parity)
    n?????????1? ?110001, 1111 0000 1111 0111
  • ?????(parity checker)-??XOR?
  • ??????????
  • ??????????

29
?????????
  • ?????(parity generator)??????,??????????????????,
    ??????????????????????? X7X6X5X4X3X2X1X0
    01000 0001? X81
  • ????????,??????

30
?????????
  • ??????????????????????? ?? 0100
    0011 ??????? 0 0100 0011 ????????????????
    O.K. ???? error
  • 74180 IC

31
?????????
  • 74180 IC ???????????????,??????????????????
  • Ex. 4-8 pp.223??74180 IC??9????????

32
?????
  • ?????(read-only memory, ROM)??????????,???????????
    ?????,?????????????????????
  • ???ROM???????????

33
?????
  • ?????(on-chip decoding)??????????????
  • ?3?8??? ABC100?Y3Y2Y1Y00110
    ABC110?Y3Y2Y1Y00011
  • n?????2n?????

34
??ROM
  • ?????????????(word)???????????????????????????????
    ?
  • ?????32???ROM,??8?4??????,???8X4 ROM???
  • ????TTL ROM7488 IC32X8 ? 256??ROM74187
    IC256X4 ? 1024??ROM74S370 IC512X4 ? 2048??ROM
  • ????????,???(mask)????????????

35
??????
  • ROM????AND-OR???????????

36
??????ROM
  • ??????ROM (programmable ROM, PROM)???????????????
  • PROM???????(burning in)?????????????????????????
  • ??PROM???ROM??????????????????????
  • ??X???????(fusible link),???????
  • PROM?,AND???????????,?OR??????

37
??????ROM
  • ?????????
  • ????PROM(EPROM)???????????????,??????????????????
    ?,????????PROM?ROM????????

38
??????????
  • PAL (Programmable Array Logic)??????????????????,?
    ??????????
  • PAL?????????AND?????????OR???

39
PAL
  • ??PROM???,????????,??????????OR????
  • ???PAL???????

40
??????????
  • PLA (Programmable Logic Array)??????????,??????AND
    ??????OR???
  • PROM?PAL?PLA???????????(Programmable Logic
    Device, PLD)?

41
PLA
42
????????
  • ?????????????????
  • ?????????????,?????????
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