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54ACT818L

更新时间: 2024-02-05 19:43:46
品牌 Logo 应用领域
美国国家半导体 - NSC /
页数 文件大小 规格书
10页 155K
描述
8-Bit Diagnostic Register

54ACT818L 技术参数

生命周期:Active包装说明:,
Reach Compliance Code:compliant风险等级:5.7
Is Samacsys:NBase Number Matches:1

54ACT818L 数据手册

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September 1998  
54ACT818  
8-Bit Diagnostic Register  
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  
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.  
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  
Features  
n On-line and off-line system diagnostics  
Logic Symbol  
DS100251-3  
TRI-STATE® is a registered trademark of National Semiconductor Corporation.  
FACT is a trademark of Fairchild Semiconductor Corporation.  
© 1998 National Semiconductor Corporation  
DS100251  
www.national.com  

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