Programmable termination for single-ended and differential...

Details Programmable termination for single-ended and differential... Programmable termination for single-ended and differential...

2007-08-28

2007-08-28

Cho, James H. (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

C326S026000

Reexamination Certificate

active

11194356

ABSTRACT:
In one embodiment of the invention, a programmable termination structure has first and second termination circuits for corresponding pads and a programmable connection therebetween. The first termination circuit supports first and second sets of termination schemes. A shared resistor is part of at least one termination scheme in each set. The first termination circuit supports a termination scheme between the first pad and a user-defined node connected to an on-chip capacitor such that first pad is connected via the termination scheme to the on-chip capacitor. Control circuitry automatically turns on and off a termination scheme for bidirectional signaling supported by the first termination circuit, wherein (1) the control circuitry turns off the termination scheme if an output buffer is configured to present outgoing signals at the first pad and (2) the control circuitry turns on the termination scheme if the output buffer is disabled in order to terminate incoming signals received at the first pad.

REFERENCES:
patent: 5705937 (1998-01-01), Yap
patent: 6051989 (2000-04-01), Walck
patent: 6480026 (2002-11-01), Andrews
patent: 6700823 (2004-03-01), Rahman et al.
patent: 7038498 (2006-05-01), Funaba
patent: 7138822 (2006-11-01), Ritchie et al.
U.S. Appl. No. 10/397,669, filed Mar. 26, 2003.

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