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54ACT818D Fiches technique(PDF) 1 Page - National Semiconductor (TI) |
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54ACT818D Fiches technique(HTML) 1 Page - National Semiconductor (TI) |
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1 / 10 page  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 TRI-STATE® is a registered trademark of National Semiconductor Corporation. FACT™ is a trademark of Fairchild Semiconductor Corporation. DS100251-3 September 1998 © 1998 National Semiconductor Corporation DS100251 www.national.com |
Numéro de pièce similaire - 54ACT818D |
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Description similaire - 54ACT818D |
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