CML (current mode logic) OCD (off chip driver)—ODT...

Details CML (current mode logic) OCD (off chip driver)—ODT... CML (current mode logic) OCD (off chip driver)—ODT...

2005-01-25

2005-01-25

Wamsley, Patrick (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Bus or line termination

C326S086000

Reexamination Certificate

active

06847225

ABSTRACT:
An apparatus for use as both an off chip driver (OCD) and an on die termination (ODT) circuits. A preferred embodiment comprises a control circuit (for example, control circuit305) coupled to a dual function OCD/ODT circuit (for example, OCD/ODT circuit330) with an enable line coupled to the control circuit. The control circuit may be used to selectively choose OCD and ODT functionality based on a value on the enable line. With the control circuit choosing OCD, the dual function OCD/ODT circuit functions as an OCD circuit, placing signals provided through the control circuit onto a transmission line. With the control circuit choosing ODT, the dual function OCD/ODT circuit becomes terminating resistors for incoming signals on a transmission line. The use of a single circuit for both OCD and ODT functions can save both integrated circuit real-estate and implementation costs due to a reduction in use of circuit elements.

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Kim et al., “Programmable and Automatically On-Die Terminator for DDR3-SRAM Interface,” 2003, IEEE, p. 391-39.

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