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Method for forwarding parity errors across a bridge

IP.com Disclosure Number: IPCOM000010672D
Publication Date: 2003-Jan-08
Document File: 2 page(s) / 57K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for forwarding parity errors across a bridge. Benefits include simple, very few silicon gates required, and improved error handling.

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Method for forwarding parity errors across a bridge

Disclosed is a method for forwarding parity errors across a bridge. Benefits include simple, very few silicon gates required, and improved error handling.

Background

� � � � � The term parity is used to generically refer to any data protection scheme.

        � � � � � Conventionally, two methods are used for forwarding parity errors across a bridge:

•        � � � � Detect incoming errors and assert an error pin to shut down the system. However, shutdown may not occur fast enough to prevent the receiver from acting upon, forwarding, or permanently storing the corrupted data.

•        � � � � Track and forward the integrity of each piece of incoming data through the bridge and indicate errors with each piece of data as it exits the bridge. One or more bits per piece of data indicate the error condition.

� � � � � Historically, PC’s have not included parity error forwarding when bridging between two interfaces. A difficulty occurs when the error protocols of the two interfaces operate on different-sized pieces of data. Determining how to forward the parity error may not be straightforward.

        � � � � �

General description

� � � � � The disclosed method forwards parity errors across a bridge between two interfaces. When a data parity error is detected in incoming data, the bridge corrupts all outgoing data parity as a simple way to forward the data integrity error without tracking the exact piece of data through data paths and translators.

        � � � � � The key elements of the method include:

•        � � � � Data error detection on the incoming interface

•        � � � � Status bit that toggles to the corrupt state when an error is detected on the incoming interface

•        � � � � Data error generation on the outgoing interface that generat...