Tektronix DPOQPI DATASHEET

Intel®Quick Path Interconnect Test Automation Software

DPOQPI Data Sheet

®

Intel

Quick Path Interconnect, sometimes referred to as "QPI", is an
Intel-proprietary p rocessor-to-processor interface that will be central to
multiprocessor architectures for the next several years. Version 1.0 of QPI,

4 GB/s, is already common in current-generation commercial

specification and test procedures. The software simplifies

to use.

Features & Benefits

Channel Embedding and Fixture De-embedding

Two Types of Equ alizer: CTLE + DFE

Configurable Clock Recovery

Eye Diagrams for Performance Visualization

Histogram Accumulation and Export to an Intel-prescribed CSV File
Format

Automatic Test Termination at a Goal Population

Programmable Interface

Remote

running at 6.
products. The next generation of this bus is V1.1. Although target data rates
for QPI V1.1 are held as Intel-proprietary, the rates are going up. As a result,
complex equalization is expected to be required, system modeling is a must,
and advanced analysis of crosstalk effects may be necessary to separate
jitter properly and project eye closure accurately.

DPOQPI is a test automation software package that Tektronix has
developed working in close partnership with the Intel engineers who own
the QPI V1.1
user operation by presenting only the features required for PHY testing of
the QPI V1.1 bus that may be needed when designing and validating node
controllers.

DPOQPI combines certain key capabilities found in SDL A and DPOJET
without requiring the user to have familiarity with all of the features of those
underlying applications, nor the advanced processing techniques being
employed. The user interface is designed to be focused, easy to set up,
and simple

Data Sheet

®

Intel

QPI V1.1 is a point-to-point data communication bus with the following
characteristics:

PHY testing of this bus calls for some familiar measurements that are
common to other high-speed serial buses, such as jitter, eye height, eye
width, etc. Many of these measurements can be found in the DPOJET
application. We have added two new measurements to DPOJET specifically
for QPI V1.1, “Eye High” and “Eye Low” which use histograms to record the
voltage levels for logic High and Low states.

However, QPI V1.1 PHY testing also requires the ability to embed
S-parameters to model the transmit channel, the ability to de-embed test
fixture effects, use of CTLE and/or DFE equalization, etc – all of which
potentially add to the complexity of configuring the measurement setup. The
DPOQPI software combines all of the key capabilities mentioned above
– and others – into an application-specific package that provides a ll the
needed functions and controls in one simplified user interface.

The software also features dat a logging and a remote programmable
interface command set, so test operation can be controlled from an external
management program and test results can be exported in the desired
format.

QPI V1.1 Bus

Multilane architecture

Unidirectional signaling

Differential signal pairs (for both clock and data), DC coupled

Forwarded clock for each link

System reference clock (shared by Transmitter and Receiver at both
ends of the link)

Transmitter and Receiver equalization

SSC capability

Figure 1 – Test Topology.

Figure2–Eyesattestfixture, end of channel, and post-EQ.

Ordering Information

1

QPI*

Intel®Quick Path Interconnect (QPI) PHY Test Automation Software.

Model New Ins

DPO/DSA/MSO70K
Series

*1Requires Option DJA. DJA is standard on DSA70K Series oscilloscopes.

trument

Orders

Opt. QPI Opt.

Upgrad

DPO-UP QPI

Produc

t

es

ng

Floati

es

Licens

Opt.

DPOFL-QPI

2 www.tektronix.com

Intel®Quick Path Interconnect Test Automation Software — DPOQPI

www.tektronix.com 3

Data Sheet

Contact Tektronix:

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Updated 25 May 2010

www.tektronix.com

For Further Information. Tektronix maintains a comprehensive, constantly expanding
collection of application notes, technical briefs and other resources to help engineers working
on the cutting edge of technology. Please visit www.tektronix.com

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14 Jan 2011 61W-26441-0