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Browse Prior Art Database

SPD and IOA Bus Expander

IP.com Disclosure Number: IPCOM000039853D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

McKinney, CN: AUTHOR

Abstract

A logic analyzer (LA) card, which is an optional feature of the Bus Test Vehicle (BTV), allows attachment of logic analyzer probes to the SPD and IOA bus. The configuration works as described in the following. A block diagram is shown which is representative of the logic card. The SPD bus is passed through receivers which redrive the bus into the card. The bus is then passed to nine special SPD connectors. The connectors allow attachment of logic analyzer pods. The IOA bus is wired directly into the nine IOA connectors. A trigger circuit also receives signals on the IOA bus. The BTV will send a trigger signal to the logic card when an error is detected on the bus or an error injection is performed.

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SPD and IOA Bus Expander

A logic analyzer (LA) card, which is an optional feature of the Bus Test Vehicle (BTV), allows attachment of logic analyzer probes to the SPD and IOA bus. The configuration works as described in the following. A block diagram is shown which is representative of the logic card. The SPD bus is passed through receivers which redrive the bus into the card. The bus is then passed to nine special SPD connectors. The connectors allow attachment of logic analyzer pods. The IOA bus is wired directly into the nine IOA connectors. A trigger circuit also receives signals on the IOA bus. The BTV will send a trigger signal to the logic card when an error is detected on the bus or an error injection is performed. External triggers from a logic analyzer, or some other source, to the error injection portion of the BTV is also possible; this external signal can be either an arm or a trigger event. The LA card can be inserted anywhere on the SPD or IOA bus. The LA card will pass on the appropriate bus signals to ensure card-to-card communications. An example of an application is given in which a user can utilize the BTV and LA card to diagnose online problems on the SPD bus. The BTV can be configured to send a trigger signal through the LA card to the logic analyzer being used. When an error is detected on the bus, the user can have the error condition, and the entire state of the bus, displayed on the logic analyzer, or any other type of bus monitoring dev...