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74F652SPC датащи(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали 74F652SPC
подробное описание детали  Transceivers/Registers
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
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74F652SPC датащи(HTML) 4 Page - National Semiconductor (TI)

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Functional Description
In the transceiver mode data present at the HIGH imped-
ance port may be stored in either the A or B register or both
The select (SAB SBA) controls can multiplex stored and
real-time
The examples in
Figure 1 demonstrate the four fundamental
bus-management functions that can be performed with the
Octal bus transceivers and receivers
Data on the A or B data bus or both can be stored in the
internal D flip-flop by LOW to HIGH transitions at the appro-
priate Clock Inputs (CPAB CPBA) regardless of the Select
or Output Enable Inputs When SAB and SBA are in the real
time transfer mode it is also possible to store data without
using the internal D flip-flops by simultaneously enabling
OEAB and OEBA In this configuration each Output reinforc-
es its Input Thus when all other data sources to the two
sets of bus lines are in a HIGH impedance state each set of
bus lines will remain at its last state
Note A Real-Time
Transfer Bus B to Bus A
TLF9581 – 6
OEAB
OEBA
CPAB
CPBA
SAB
SBA
LL
X
X
X
L
Note B Real-Time
Transfer Bus A to Bus B
TLF9581 – 7
OEAB
OEBA
CPAB
CPBA
SAB
SBA
HHX
X
L
X
Note C Storage
TLF9581 – 8
OEAB
OEBA
CPAB
CPBA
SAB
SBA
XH
L
XX
X
LX
X
L
XX
LH
LL
XX
Note D Transfer Storage
Data to A or B
TLF9581 – 9
OEAB
OEBA
CPAB
CPBA
SAB
SBA
H
L
HorL
HorL
H
X
FIGURE 1
Inputs
InputsOutputs (Note 1)
Operating Mode
OEAB
OEBA
CPAB
CPBA
SAB
SBA
A0 thru A7
B0 thru B7
L
H
HorL
HorL
X
X
Input
Input
Isolation
LH
LL
X
X
Store A and B Data
XH
L
H or L
X
X
Input
Not Specified
Store A Hold B
HH
LL
X
X
Input
Output
Store A in Both Registers
L
X
HorL
L
X
X
Not Specified
Input
Hold A Store B
LL
LL
X
X
Output
Input
Store B in Both Registers
LL
X
X
X
L
Output
Input
Real-Time B Data to A Bus
L
L
X
H or L
X
H
Store B Data to A Bus
HHX
X
L
X
Input
Output
Real-Time A Data to B Bus
H
H
H or L
X
H
X
Stored A Data to B Bus
H
L
H or L
H or L
H
H
Output
Output
Stored A Data to B Bus and
Stored B Data to A Bus
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
L e LOW to HIGH Clock Transition
Note 1
The data output functions may be enabled or disabled by various signals at OEAB or OEBA inputs Data input functions are always enabled ie data at the
bus pins will be stored on every LOW to HIGH transition on the clock inputs
4


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