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54ACT818

National Semiconductor
Part Number 54ACT818
Manufacturer National Semiconductor
Description 8-Bit Diagnostic Register
Published Nov 18, 2008
Detailed Description 54ACT818 8-Bit Diagnostic Register September 1998 54ACT818 8-Bit Diagnostic Register General Description www.DataSheet...
Datasheet PDF File 54ACT818 PDF File

54ACT818
54ACT818

Overview
54ACT818 8-Bit Diagnostic Register September 1998 54ACT818 8-Bit Diagnostic Register General Description www.
DataSheet4U.
com The ’ACT818 is a high-speed, general-purpose pipeline register with an on-board diagnostic register for performing serial 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 select parallel inputs from the Y-port or adjacent bits in the diagnostic 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 registers are replaced with ’ACT818 diagnostic pipeline registers.
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 inspected for the expected results.
WCS loading can be accomplished 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 ’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 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 D...


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