ky thuat so

1. PLD
THIẾT BỊ LOGIC LẬP TRÌNH ĐƯỢC
(Programmable Logic Device)
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2. BOÄ NHÔÙ BAÙN
DAÃN
Boä nhôù baùn daãn
Boä nhôù baûng Boä nhôù haøm
RAM ROM
tónh ñoäng MROM
PROM
EPROM
EEPRO
M
PLD
PLAPALLCA
PPA
LEPLPA
LEEPPAL
EPL
D
PEELGAL
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3. BOÄ NHÔÙ ROM
Input: caùc tín hieäu ñòa chæ (Address)
Output: caùc tín hieäu döõ lieäu (Data)
A0
A1
An-1
D0
D1
Dm-1
INPUT
(n ñöôøng)
OUTPUT
(m ñöôøng)
Kích thöôùc ROM: 2n x m (bit)
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4. word line
bit
line
101
1
0
1
1
1
1
1
0
1
1
1
Baûng naïp ROM
A2 A1
0
1
0
0
A0
D3 D2 D1
0 0 D0
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
0 1 1 0
1 1 0 1
1 0 1 1
1 0 0 0
1 0 0 1
0 0 1 0
0 1 0 0
0
Caáu truùc noäi ROM 8 x
4 (bit)
1
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5. ROM 128 x 1 (bit) giaûi maõ
2 chieàu
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6. ROM 32K x 8 (bit) = 32KB
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7. Caáu truùc ROM coù ngoõ vaøo
ñieàu khieån
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8. Coång ñeäm ba traïng thaùi (Tristate Output
Buffer):
3 traïng thaùi (tristate): LOW / HIGH / HIGH impedance
Traïng thaùi toång trôû cao (HIGH impedance): ngoõ ra hôû maïch
- Ngoõ ñieàu khieån 3 traïng thaùi:
* HIGH: The buffer is Active
* LOW: HIGH
impedance
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9. Caùc EPROM thoâng duïng
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10. PLA
(PROGRAMMABLE LOGIC
ARRAY)
INPUT
(n bit)
OUTPUT
(m bit)
k product term (soá
haïng tích)
Daõy
AND
Daõy
OR
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11. Daõy AND coù theå laäp
trình
Daõy OR coù theå laäp
trình
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12. A Caáu truùc PLA 3 x 2, 4 soá
F1 = A B + A C + A B
CF2 = A C + B C
0
1
haïng tích
B
C
C C B B A A
A B
A C
B C
A B
C
F1
F2
Baûng naïp
PLA A B C F2 (C) F1
(T)
1 0
-
A B
A C 1 -
B C 1- 1
A B 1
C
0 1
0
0
11
11
00
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13. PAL
(PROGRAMMABLE ARRAY
LOGIC )
- Daõy AND laäp trình, daõy OR coá ñònh
- Moãi ngoõ ra laø coång OR coù soá ngoõ vaøo
coá ñònh
- Soá haïng tích khoâng söû duïng chung cho caùc
ngoõ ra
- Caáu truùc PLA: soá ngoõ vaøo, soá ngoõ ra vaø
soá coång AND treân 1 coång OR
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14. Caáu truùc PAL 3 ngoõ vaøo, 3 ngoõ ra, 3
coång AND / OR
1
2
3
4
5
6
7
8
9
I1
I2
I3
F1
F2
F3
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15. A
1
2
3
4
5
6
7
8
9
B
C
X
Y
Z
A A B B C C X X
X = A B +
B C
Z = A B + B C + B C +
A C
Y = A + B C
= X + B C + A C
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16. X = A B +
B C
Z = A B + B C + B C +
A C
Y = A + B C
= X + B C + A C
Baûng naïp
PAL
A B C
X
OUTPUT
X = A B
+ B
C
1 1
1 1
0 Y = A
0 0
+ B C
Z = X
1 0 0
+ B C
0 1
+ A C
1
2
3
4
56
7
8
9
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