Static information storage and retrieval – Systems using particular element – Flip-flop
Reexamination Certificate
2002-07-16
2004-01-27
Elms, Richard (Department: 2824)
Static information storage and retrieval
Systems using particular element
Flip-flop
C365S189050, C365S189110, C365S205000
Reexamination Certificate
active
06683804
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to integrated-circuit memories.
2. Description of the Related Art
Access to static random access memories (SRAMs) and to read-only memories (ROMs) is required by various integrated circuits (e.g., digital signal processors, microcontrollers and field-programmable gate arrays). These memories are typically supplied as separate and distinct structures and fixed, pre-programmed data is generally stored in the read-only memory with variable data written into and read from the read/write memory.
In many applications, read-only memory is accessed infrequently yet it occupies significant integrated-circuit area. In addition, some applications of a specific integrated circuit require increased amounts of read-only memory while other applications require increased amounts of read/write memory and these conflicting needs are often unpredictable and unknown at time of integrated-circuit fabrication. Increasing both the read-only and the read/write memories has been a conventional response to these contrasting needs but this response is expensive and demands valuable integrated-circuit space.
BRIEF SUMMARY OF THE INVENTION
The present invention is directed to read/write memory arrays that significantly enhance flexibility of memory allocation without increasing memory area nor significantly altering conventional read/write processes.
These goals are realized with a read/write memory that provides predetermined latent-state patterns which are retrieved with a latent-state retrieve process that differs somewhat from a conventional write process.
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Duggan Colin David
Eby Michael D.
Zemlok Kenneth Carl
Analog Devices Inc.
Koppel, Jacobs Patrick & Heybl
Nguyen Nam
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