Method for organizing state machine by selectively grouping status signals as inputs and classifying commands to be executed into performance sensitive and nonsensitive categories

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United States of America Patent

PATENT NO 5375248
SERIAL NO

08099117

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Abstract

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A virtual memory unit (VMU) includes a state machine for controlling its operations in response to commands received from another unit. The state machine includes a plurality of programmable array logic (PAL) devices which are connected to gather status from the different sections of the unit. The outputs of the PAL devices connect in common and supply a first address input to an addressable state memory. The state memory includes a plurality of locations, each of which stores a binary code defining a different machine state. The state memory locations are accessed as a function of the status signals and current state and used in turn to generate the required subcommands for executing the received commands. The state machine makes it possible to easily classify the received commands to their complexity and urgency in terms of their effect on overall system performance.

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Patent Owner(s)

Patent OwnerAddress
BULL HN INFORMATION SYSTEMS INCCHELMSFORD MA 01824-4174

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Lemay, Richard A Carlisle, MA 41 645
Tague, Steven A Tyngsboro, MA 16 246
Woods, William E Natick, MA 34 429

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