Browse Prior Art Database

Debug Mode for a Module Interfacing to a Serial Link

IP.com Disclosure Number: IPCOM000038214D
Original Publication Date: 1989-Dec-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Barrett, WM: AUTHOR [+2]

Abstract

A method is described that debugs and analyzes information transmitted through a serial network. This is accomplished by taking a logic module that interfaces to the serial network and adding a capability to operate in a special mode. While in this special "debug" mode, it is possible for the module to be a passive element in the network and provide to a user information traveling through the network.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 81% of the total text.

Page 1 of 1

Debug Mode for a Module Interfacing to a Serial Link

A method is described that debugs and analyzes information transmitted through a serial network. This is accomplished by taking a logic module that interfaces to the serial network and adding a capability to operate in a special mode. While in this special "debug" mode, it is possible for the module to be a passive element in the network and provide to a user information traveling through the network.

Each node that connects to the serial network does one of the following operations: 1. Receive data off of the network (deserialize and then decode).

2. Transmit data onto the network (encode and then serialize).

Each node comprises a single logic module that interfaces to the network as well as to other logic within the node. Fig. 1 shows how one node interfaces to the network.

Characteristics of the "debug" mode are:

1. Always pass-through the information. In other words, all data received from the network are automatically transmitted back out onto the network with no modification. This means that no data are added to or deleted from the network. 2. As the data are passed through the module, the deserializing and decoding functions are performed on the data (just as they are done in a normal operating mode), but this information is funneled out on separate signal pins of the module for use in monitoring and analyzing the traffic. 3. The results of error checking and special character recognition logic within th...