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National Semiconductor Electronic Components Datasheet

54ACT818 Datasheet

8-Bit Diagnostic Register

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September 1998
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54ACT818
8-Bit Diagnostic Register
General Description
The ’ACT818 is a high-speed, general-purpose pipeline reg-
ister with an on-board diagnostic register for performing se-
rial diagnostics and/or writable control store loading.
The D-to-Y path provides an 8-bit parallel data path pipeline
register for normal system operation. The diagnostic register
can load parallel data to or from the pipeline register and can
output data through the D input port (as in WCS loading).
The 8-bit diagnostic register has multiplexer inputs that se-
lect parallel inputs from the Y-port or adjacent bits in the di-
agnostic register to operate as a right-shift-only register. This
register can then participate in a serial loop throughout the
system where normal data, address, status and control reg-
isters are replaced with ’ACT818 diagnostic pipeline regis-
ters. The loop can be used to scan in a complete test routine
starting point (Data, Address, etc.). Then after a specified
number of machine cycles it scans out the results to be in-
spected for the expected results. WCS loading can be ac-
complished using the same technique. An instruction word
can be serially shifted into the shadow register and written
into the WCS RAM by enabling the D output.
Features
n On-line and off-line system diagnostics
n Swaps the contents of diagnostic register and output
register
n Diagnostic register and diagnostic testing
n Cascadable for wide control words as used in
microprogramming
n Edge-triggered D registers
n Outputs source/sink 24 mA
n ’ACT818 has TTL-compatible inputs
n ’ACT818 is functionally- and pin-compatible to AMD
Am29818 and MMI 74S818
n Standard Microcircuit Drawing (SMD) 5962-9160901
Applications
n Register for microprogram control store
n Status register
n Data register
n Instruction register
n Interrupt mask register
n Pipeline register
n General purpose register
n Parallel-serial/serial-parallel converter
Logic Symbol
DS100251-3
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
FACTis a trademark of Fairchild Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100251
www.national.com


National Semiconductor Electronic Components Datasheet

54ACT818 Datasheet

8-Bit Diagnostic Register

No Preview Available !

Connection Diagrams
Pin Assignment
for DIP and Flatpak
www.DataSheet4U.com
DS100251-1
Pin Names
D0– D7
SDI
DCLK
MODE
PCLK
OEY
SDO
Y0– Y7
Description
Data Inputs
Serial Data Input
Diagnostics Clock
Control Input
Pipeline Register Clock
Output Enable Input
Serial Data Output
Data Outputs
Diagnostic Register
Pin Assignment
for LCC
DS100251-2
www.national.com
DS100251-4
2


Part Number 54ACT818
Description 8-Bit Diagnostic Register
Maker National Semiconductor
Total Page 10 Pages
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