Figure 1. The PCI 6156 in a Video Capture Application

If the data is not available, this long cycle starts again. Even at the point when the data becomes available, an additional

delay in getting the data still applies because the requestor has to go through the process of gaining access to the bus and

other arbitrating issues before gaining access to the data.

The PCI 6156 device, however, prohibits such delays from decreasing system performance. The requestor device on the

primary bus, rather than being retried, is allowed to hold onto the bus and wait until the data is ready on the secondary

side. When the data on the secondary side is ready, the data is delivered immediately to the requestor device, waiting on

the primary side. Because data is immediately presented to the requestor at the earliest possible time, the “no retry

penalty” flow service offered by the PCI 6156 results in reduced transaction latency and increased throughput

performance. The PLX FastLane PCI 6156 offers unparalleled PCI load support and advanced performance features,

enabling cost sensitive, space limited applications to continue to provide high quality, high performance data transmission

capability.

PLX Technology, Inc.

870 Maude Ave.

Sunnyvale, CA 94085 USA

Tel: 1-800-759-3735

Tel: 1-408-774-9060

Fax: 1-408-774-2169

Email: info@plxtech.com

Web Site: www.plxtech.com

Product Ordering Information

Part Number

Description

PCI 6156-DA33PC

PCI 6156 PCI--to-PCI Bridge Chip (PQFP)

© 2004 PLX Technology, Inc. All rights reserved. PLX and the PLX logo are registered trademarks of PLX Technology, Inc. All other product names that appear in this

material are for identification purposes only and are acknowledged to be trademarks or registered trademarks of their respective companies. Information supplied by PLX is

believed to be accurate and reliable, but PLX Technology, Inc. assumes no responsibility for any errors that may appear in this material. PLX Technology, Inc. reserves the

right, without notice, to make changes in product design or specification.

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