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
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