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參數(shù)資料
| 型號： | 74LS670 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-by-4 Register File(with three-state outputs) |
| 中文描述： | 按4寄存器文件（帶三態(tài)輸出4） |
| 文件頁數(shù)： | 2/6頁 |
| 文件大?。?/td> | 65K |
| 代理商： | 74LS670 |
www.fairchildsemi.com
2
DM74LS670
Connection Diagram
Function Tables
Write Table (Note 1)(Note 2)
Read Table (Note 3)
H
= HIGH Level
L
= LOW Level
X
= Don’t Care
Z
= High Impedance (OFF)
Note 1: (Q
= D) = The four selected internal flip-flop outputs will assume the states applied to the four external data inputs.
Note 2: Q0 = The level of Q before the indicated input conditions were established.
Note 3: WOB1
= The first bit of word 0, etc.
Logic Diagram
Write Inputs
Word
WB
WA
GW
0123
LL
L
Q
= DQ
0
Q0
LH
L
Q0
Q
= DQ
0
Q0
HL
L
Q0
Q
= DQ
0
HH
L
Q0
Q
= D
XX
H
Q0
Read Inputs
Outputs
RB
RA
GR
Q1
Q2
Q3
Q4
L
WOB1
WOB2
WOB3
WOB4
L
H
L
W1B1
W1B2
W1B3
W1B4
H
L
W2B1
W2B2
W2B3
W2B4
H
L
W3B1
W3B2
W3B3
W3B4
X
H
Z
ZZZ
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