Static information storage and retrieval – Read/write circuit – Serial read/write
Reexamination Certificate
2006-05-02
2006-05-02
Nguyen, VanThu (Department: 2824)
Static information storage and retrieval
Read/write circuit
Serial read/write
C365S078000, C365S189120
Reexamination Certificate
active
07038965
ABSTRACT:
The present invention discloses a pointer generator which generates pointer values for a stack (LIFO memory). The pointer generator includes a selection input terminal and a bi-direction linear feedback shift register. The selection input terminal transmits a selection signal to the bi-direction linear feedback shift register in response to a command to read/write the stack. The fundamental structure of the bi-direction linear feedback shift register is a linear feedback shift register. After receiving the selection signal from the selection input terminal, the bi-direction linear feedback shift register performs calculation of a specific primitive characteristic polynomial, and then creates a number sequence. When the selection signal changes, the bi-direction linear feedback shift register creates another number sequence by performing calculation of another specific primitive characteristic polynomial. The two number sequences are exactly opposite to each other in order. Therefore, one sequence can be used as up-counting stack pointer values for the “write” command, and the other sequence can be used as down-counting stack pointer values for “read” command.
REFERENCES:
patent: 4751675 (1988-06-01), Knauer
patent: 4807185 (1989-02-01), Kamiya
patent: 4899307 (1990-02-01), Lenoski
patent: 6345353 (2002-02-01), Allen et al.
Bednarek Michael
Benq Corporation
Nguyen Van-Thu
Pillsbury Winthrop Shaw & Pittman LLP
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