4.1 4.2 /4.3 4.4 4.5 4.6 CAD

4.1 . NnNn: 2nN

8-383164164

18-3

1:I0I78A1A2 A32

(3)

-1041BCDBCD

842154212421.

2104

28421 BCDI0I90910Y0Y3.

8421BCDI8I91Y31

(a)

1

1

1

I9 I8 I7I6I5I4 I3I2 I1 I0

Y3 Y2 Y1 Y0

1

_1046864610.unknown

&

&

&

&

Y3 Y2 Y1 Y0

(b)

I9 I8 I7I6I5I4 I3I2 I1 I0

3 000110 ABC 10Y1, Y2

: 3 3

33 3

74LS148

74LS148

74LS148 74LS148 CPU 74LS148 074LS148

4.2 /4.2.1 ::

4.2.2 1n2n2n10012438416

38

1

A2 A1 A0

Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7

0 0 0

0 0 1

0 1 0

0 1 1

1 0 0

1 0 1

1 1 0

1 1 1

1 0 0 0 0 0 0 0

0 1 0 0 0 0 0 0

0 0 1 0 0 0 0 0

0 0 0 1 0 0 0 0

0 0 0 0 1 0 0 0

0 0 0 0 0 1 0 0

0 0 0 0 0 0 1 0

0 0 0 0 0 0 0 1

2

3

1

1

Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0

A2 A1 A0

1

&

&

&

&

&

&

&

&

74LS1383-8

A0 A1 A2 G2A G2B G1 Y7 GND

VCC Y0 Y1 Y2 Y3 Y4 Y5 Y6

16 15 14 13 12 11 10 9

74LS138

1 2 3 4 5 6 7 8

A0 A1 A2 G2A G2B G1

Y0 Y1 Y2 Y3 Y4 Y5 Y6Y7

74LS138

Y0 Y1 Y2 Y3 Y4 Y5 Y6Y7

A0 A1 A2 STB STC STA

(a)

(b)

G1

A2 A1 A0

1

0

1 0

1 0

1 0

1 0

1 0

1 0

1 0

1 0

0 0 0

0 0 1

0 1 0

0 1 1

1 0 0

1 0 1

1 1 0

1 1 1

1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 1

1 1 1 1 1 1 1 0

1 1 1 1 1 1 0 1

1 1 1 1 1 0 1 1

1 1 1 1 0 1 1 1

1 1 1 0 1 1 1 1

1 1 0 1 1 1 1 1

1 0 1 1 1 1 1 1

0 1 1 1 1 1 1 1

_1050213523.unknown

_1050216048.unknown

_

74LS138 D7 D6 D5 D4 D3 D2 D1 D0 B2 B1 B 03/883

74LS138416

A3=074LS138(1)A2A1A0Y0Y7A3=174LS138(2)YY5

2-8421 BCD74LS42

Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9

Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 Y8 Y9

A0 A1 A2 A3

74LS42

Y0 Y1 Y2 Y3 Y4 Y5 Y6 GND

VCC A0 A1 A2 A3 Y9 Y8 Y7

16 15 14 13 12 11 10 9

74LS42

1 2 3 4 5 6 7 8

A0 A1 A2 A3

(a)

(b)

1

1

1=m3+m5+m6+m7= 23874LS138 74LS138Y1

1374.2.13-8F=XYZ+XYZ+XYZ+XYZF=XYZ+XYZ+XYZ

3:

:

:(LED)

1 2a ; (b) ; (c)

3

274LS48 4 74LS48

74LS48

4.2.3 3-8

4.3

7415181

174151 161

21 4.3.1 8174151L=AB+BC+AC =m3+m5+m6+m7

24.3.2 41ABCL

4.4 11274LS8543100100100100Y(A=B)A B0 00 11 01 174LS85AB

4.5 4.5.1 1

:

2

4.5.2 14

COCI.

2474LS283

Gi=AiBiPi= Ai=Bi=1Gi=1Pi=1AiBi=0Ci=Ci-1Ci

374182

4.5.3

A-B=A+B-2n= A+B-2nABA

4.5.4 / ALUALU74LS381 416ALU44ALU74LS381

124A1A01 01 1 1 11 0 1 11 0 1 11 1 1 10 00 11 01 1A1 A0 1010A1A0=10 D

2n2nn12 1 n n2n0

1 38Z03874LS138ZABC1Z=m0+m6+m7 Y0+Y6+Y7Z=m0+m6+m7Z=m0+m6+m7ZABC1

2 74LS138111ABCISCOSCO

;

145