Memory based interface

Details Memory based interface Memory based interface

1995-09-15

1997-05-06

Beausoliel, Jr., Robert W.

Excavating

371 221, 371 225, 371 226, G01R 3128

Patent

active

056278403

ABSTRACT:
A method and system for optimizing shift operations by reducing the computational overhead and the number of full scan path shifts associated with accessing and modifying data on a rotating scan path image are disclosed. The system further simplifies the construction of a scan path image by inserting a programmable number of leading and trailing bits around a selected string of data bits. The system manipulates and constructs a scan path image without having to shift or prepare the entire scan path image in memory. Specifically, the system comprises a master controller having a lead bypass module, a trail bypass module, a first shift module, a second shift module, a select module and a shift control module. Collectively, these modules comprise the necessary hardware for executing a plurality of shift optimization functions which include lead and trail bypass insertion, non-destructive read, field isolation, field insertion, bit order reversion, bit rotation and simultaneous read and write operation. The system further incorporates shift access windows and status registers for implementing shift operations without system calls.

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Lee Whetsel, Hierarchically Accessing 1149.1 Applications in a System Environment, IEEE, Test Conference 1993 Proceedings, pp. 517-526.

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