Intel Corporation

Sarah E Bates

Nasser A Kurd

David J O'Brien

R Tim Frodsham

Mike J Tripp

Anne Meixner

Jeff Wight

Rajay R Pai

T Andrew Crump

In one embodiment, an integrated circuit including a plurality of input/output (I/O) buffers is disclosed. The integrated circuit contains a plurality of I/O buffers. Each of the I/O buffers include an I/O test circuit that generates test pattern signals whenever the integrated circuit is operating in a loopback test mode. According to a further embodiment, the integrated circuit includes one or more programmable delay circuits coupled to the I/O buffers that permit switching state (AC) loopback timing tests to be conducted.

Method and apparatus for conducting input/output loop back tests using a local pattern generator and delay elements

A system includes an operating system capable of providing a first operating environment and a first routine running outside the first operating environment. The first routine is adapted to selectively load the operating system or to present an interface through which a user may access and change or update predetermined information. The routine is adapted to transition the system to an off state without loading the operating system.

Operation of a system

Signal driving circuitry includes first and second drivers that are coupled to different points on a transmission line having an impedance. The first driver includes a transistor and a resistance that matches the transmission line impedance. The transistor is active to drive the transmission line to a specified voltage when the first and second drivers are inactive. In one configuration, the first and second drivers include CMOS drivers. In another configuration, the first driver includes a CMOS driver while the second driver includes a GTL-type driver. Termination devices in the first and second drivers may be alternately switched in and out of the signal driving circuitry depending on which driver is activated.

Signal line drivers

Growing community of inventors

Palo Alto, CA, United States of America

Sarah E Bates