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參數(shù)資料
| 型號： | HD74HC670 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-by-4 Register File (with 3-state outputs) |
| 中文描述： | 4 × 4寄存器文件（具有三態(tài)輸出） |
| 文件頁數(shù)： | 2/10頁 |
| 文件大小： | 56K |
| 代理商： | HD74HC670 |
HD74HC670
2
Function Table
Write Inputs
Word
W
B
L
W
A
L
G
W
L
0
1
2
3
Q = D
Q
0
Q = D
Q
0
Q
0
Q = D
Q
0
Q
0
Q
0
Q = D
L
H
L
Q
0
Q
0
Q
0
Q
0
H
L
L
Q
0
Q
0
Q
0
H
H
L
Q
0
Q
0
X
X
H
Q
0
Read Inputs
Outputs
R
B
L
R
A
L
G
R
L
Q
1
W
0
B
1
W
1
B
1
W
2
B
1
W
3
B
1
Z
Q
2
W
0
B
2
W
1
B
2
W
2
B
2
W
3
B
2
Z
Q
3
W
0
B
3
W
1
B
3
W
2
B
3
W
3
B
3
Z
Q
4
W
0
B
4
W
1
B
4
W
2
B
4
W
3
B
4
Z
L
H
L
H
L
L
H
H
L
X
H :
L
X :
Z
(Q = D) :
X
H
high level
low level
irrelevant
high impedance (off)
The four selected internal flip-flop outputs will assume the states applied to the four external data
inputs.
The level of Q before the indicated input conditions were established.
:
The first bit of word 0, etc.
:
:
Q
0
:
W
0
B
1
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