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54ACT818D Datasheet

  • 54ACT818D

  • 8-Bit Diagnostic Register

  • 10頁

  • NSC

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54ACT818 8-Bit Diagnostic Register
September 1998
54ACT818
8-Bit Diagnostic Register
General Description
The 鈥橝CT818 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 鈥橝CT818 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.
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
鈥橝CT818 has TTL-compatible inputs
n
鈥橝CT818 is functionally- and pin-compatible to AMD
Am29818 and MMI 74S818
n
Standard Microcircuit Drawing (SMD) 5962-9160901
Applications
n
n
n
n
n
n
n
n
Register for microprogram control store
Status register
Data register
Instruction register
Interrupt mask register
Pipeline register
General purpose register
Parallel-serial/serial-parallel converter
Features
n
On-line and off-line system diagnostics
Logic Symbol
DS100251-3
TRI-STATE
廬
is a registered trademark of National Semiconductor Corporation.
FACT
鈩?/div>
is a trademark of Fairchild Semiconductor Corporation.
漏 1998 National Semiconductor Corporation
DS100251
www.national.com

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