David E Houseman

Author:

David Houseman

ISBN #:

0406370028

Author:

David Houseman

ISBN #:

0406597014

Author:

David Houseman

ISBN #:

0406597030

Author:

David Houseman

ISBN #:

0406597049

Author:

David Houseman

ISBN #:

0406597057

Author:

David Houseman

ISBN #:

0406597065

Author:

David Houseman

ISBN #:

0406935890

US Patent:

45596182, Dec 17, 1985

Filed:

Sep 13, 1982

Appl. No.:

6/417801

Inventors:

David L. Houseman - West Chester PA
Paul Bowden - Raleigh NC

Assignee:

Data General Corp. - Westborough MA

International Classification:

G11C 1300

US Classification:

365 49

Abstract:

A content-addressable memory module which performs an associative clear operation in response to a clear signal provided on a clear line. The associative clear operation simultaneously clears all registers in the content-addressable memory module whose contents match bits in a pattern input to the content-addressable memory module. A mask input along with the pattern determines which bits of the pattern are significant for the match. Each register in the content-addressable memory module has a bidirectional match line associated with it. A register's bidirectional match line carries a match signal only if that register contains data matching the pattern bits specified by the mask and the bidirectional match line is receiving a match signal from an external source. Clearing logic associated with each register clears the register when a clear signal appears on the clear line while the register's bidirectional match line is carrying a match signal. In content-addressable memories constructed of such content-addressable memory modules, memory match lines connect match lines associated with a number of registers.

US Patent:

58452958, Dec 1, 1998

Filed:

Aug 27, 1996

Appl. No.:

8/703698

Inventors:

David Leon Houseman - Chester Springs PA
Duane Jay McCrory - Malvern PA

Assignee:

Unisys Corporation - Blue Bell PA

International Classification:

G06F 1730

US Classification:

707204

Abstract:

A database and warehousing system including a media controller which provides instantaneous access of a snapshot of data for offline analysis by a data analysis host. A transaction host sends the data for storage to the media controller. The media controller stores the data in an original copy with a plurality of mirror images. Upon receiving a request for a snapshot of the data, the data analysis generates a snapshot copy by releasing a mirror image or the original copy. The snapshot copy is provided as a snapshot of data to the data analysis host. After completing processing of the snapshot of data, data analysis host sends a return ready signal to the media controller. In response, the media controller updates the mirror image in the snapshot of data and reconnects the updated mirror image to the transaction host.