Tektronix, Inc.

Gene L Markozen

Barton T Hickman

James M Fenton

Kevin Taylor

A trigger circuit generates a trigger signal when a differential input signal crosses a differential threshold voltage level. A first side of the differential input signal is applied to a first terminal of a first load termination resistor. A second side of the differential signal is applied to a first terminal of a second load termination resistor. A first side of the differential threshold voltage level is applied to a second terminal of the first load termination resistor. A second side of the differential threshold voltage level is applied to a second terminal of the second load termination resistor. A comparator generates the trigger signal when a voltage level at the first terminal of the first resistor exceeds a voltage level at the first terminal of the second resistor.

Generating a trigger from a differential signal

The subject invention facilitates the efficient operation of the disassembly of the microprocessor bus by providing an apparatus and method for detecting and correcting a strobe phase inversion and predrive filtering in a 2&#xd7; source synchronous data transfer bus. Apparatus according to the subject invention detects a data strobe inversion in a source synchronous 2&#xd7; data bus and corrects for this inversion by reordering the received data as well as filtering predrive effects in real time. Specifically, this apparatus according to the subject invention monitors bus traffic in a multiprocessor environment and correctly captures all double data rate exchanges regardless of the source IC or destination IC in the system.

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Tigard, OR, United States of America

Gene L Markozen