Bi-directional shift register control circuit

Details Bi-directional shift register control circuit Bi-directional shift register control circuit

2005-08-30

2005-08-30

Wambach, Margaret R. (Department: 2816)

Electrical pulse counters, pulse dividers, or shift registers: c

Shift register

Shift direction control

C345S099000, C345S100000

Reexamination Certificate

active

06937687

ABSTRACT:
A bi-directional shift register circuit comprising, a plurality of shift register stages, each having an input and an output terminal, and a bi-directional shift controller circuit associated with each of said shift register stages is disclosed. The bi-directional shift controller circuit comprises a first input connected to a output terminal of a first shift register stage and a second input connected to a output terminal of a second shift register stage. Means to apply a first and a second control voltage, wherein said first and second control voltage are different, and a combinatorial circuit responsive to said first and second control voltages to apply an indication of an input received from either said first shift register or said second shift register to said corresponding shift register input terminal. The combinatorial circuit configuration is that of a NOR gate or a NAND gate.

REFERENCES:
patent: 5894296 (1999-04-01), Maekawa
patent: 6061417 (2000-05-01), Kelem

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