Coded data generation or conversion – Digital code to digital code converters – To or from multi-level codes
Patent
1995-04-21
1997-07-22
DeBoer, Todd E.
Coded data generation or conversion
Digital code to digital code converters
To or from multi-level codes
375286, 371 56, 326 60, H03M 516
Patent
active
056507801
ABSTRACT:
A decoding method for tri-state read-only memory is disclosed herein. The cells of the tri-state memory are read the storage bits of all cells are combined to form a storage code. Each bit represents one of a first state, a second state and a third state. The storage code is first decoded to convert the storage code into an intermediate code. The intermediate code includes a plurality of conversion codes, each of which is one of a first code, a second code, and a third code corresponding respectively to the first, second, and third states. The intermediate code is further decoded into the binary output code. The resulting binary code has a greater number of bits than its corresponding storage code. Thus, the read-only memory, in accordance with the present invention, can store more than one bit of data in a single memory cell.
REFERENCES:
patent: 3866147 (1975-02-01), De Couvreurdal
patent: 4097859 (1978-06-01), Looschen
patent: 4244051 (1981-01-01), Fujikura et al.
patent: 4885582 (1989-12-01), La Barge et al.
Mano, M. Morris, Prof. Eng., California State University, Los Angeles "Computer System Architecture," Article, 10pp., Prentice-Hall, Inc., Englewood Cliffs, NJ, 1976.
Deboer Todd E.
United Microelectronics Corporation
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