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74ACT818 Arkusz danych(PDF) 2 Page - Fairchild Semiconductor

Numer części 74ACT818
Szczegółowy opis  8-Bit Diagnostic Register
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Producent  FAIRCHILD [Fairchild Semiconductor]
Strona internetowa  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74ACT818 Arkusz danych(HTML) 2 Page - Fairchild Semiconductor

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Pin Descriptions
Functional Description
Data transfers into the diagnostic register occur on the
LOW-to-HIGH transition of DCLK. Mode and SDI deter-
mine what data source will be loaded. The pipeline register
is loaded on the LOW-to-HIGH transition of PCLK. Mode
selects whether the data source is the data input or the
diagnostic register output. Because of the independence of
the clock inputs, data can be shifted in the diagnostic regis-
ter via DCLK and loaded into the pipeline register from the
data input via PCLK simultaneously, as long as no setup or
hold times are violated. This simultaneous operation is
legal.
Function Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
 = LOW-to-HIGH Clock Transition
Diagnostic Register
Block Diagram
Pin Names
Description
D0–D7
Data Inputs
SDI
Serial Data Input
DCLK
Diagnostics Clock
MODE
Control Input
PCLK
Pipeline Register Clock
OEY
Output Enable Input
SDO
Serial Data Output
Y0–Y7
Data Outputs
Inputs
Outputs
Operation
SDI
MODE DCLK
PCLK
SDO
Diagnostic Reg.
Pipeline Reg.
XL

XS7
SI
<SI − 1,
NA
Serial Shift; D7–D0 Disabled
SO
<SD
I
XL
X

S7
NA
PI
<DI
Normal Load Pipeline Register
LH

XL
SI
<YI
NA
Load Diagnostic Register from Y;
DI Disabled
XHX

SDI
NA
PI
<SI
Load Pipeline Register from
Diagnostic Register
HH

X
H
Hold
NA
Hold Diagnostic Register; DI
Enabled


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