Title:
MULTI-MODE COUNTER NETWORK
Document Type and Number:
WIPO Patent Application WO1987007968
Kind Code:
A3
Abstract:
A multi-mode counter network and a method of testing the operation of the multi-mode counter network are disclosed. The multi-mode counter network comprises a counter circuit formed of a plurality of counter registers and a multiplexer circuit formed of a plurality of multiplexers wherein said multiplexers are connected to and associated with one of the registers and are operative to selectively vary the input signal communicated to the associated register such that the registers operate in one of a plurality of operational modes. By controlling the selection of the input signal communicated to the registers the network may be alternately configured to perform traditional counting functions or may be configured to provide a serial signal path for communicating a test pattern through the registers and multiplexers to test the operation of the multiplexers and registers. The test pattern is communicated through the circuit, bypassing counter enabling circuitry, and thus independent of the network counter rate.
Inventors:
UNDERWOOD GEORGE D (US)
Application Number:
PCT/US1987/001240
Publication Date:
January 28, 1988
Filing Date:
May 29, 1987
Export Citation:
Assignee:
HUGHES AIRCRAFT CO (US)
International Classes:
G01R31/3185; G01R31/28; G06F11/22; G06F11/26; H03K21/12; H03K21/40; G06F; H03K; (IPC1-7): G06F11/26
Foreign References:
| EP0136461A1 | 1985-04-10 | |||
| US4092522A | 1978-05-30 | |||
| US4649539A | 1987-03-10 |
Other References:
IBM Technical Disclosure Bulletin, Volume 18, No. 3, August 1975, (New York, US), R.E. BODNER et al.: "Testing Counters" pages 905-907 see the whole document
First Annual Phoenix Conference on Computers and Communications 1982 Conference Proceedings, 9-12 May 1982, Phoenix, Arizona, IEEE, (US), L. BASHAW et al.: "Design for Testability at Honeywell large Information Systems Division", pages 81-83 see the whole document
First Annual Phoenix Conference on Computers and Communications 1982 Conference Proceedings, 9-12 May 1982, Phoenix, Arizona, IEEE, (US), L. BASHAW et al.: "Design for Testability at Honeywell large Information Systems Division", pages 81-83 see the whole document
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