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Sleep Mode on Computer Processor Bus to Aid in Field Replaceable Unit Isolation

IP.com Disclosure Number: IPCOM000039525D
Original Publication Date: 1987-Jun-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Davis, GT: AUTHOR [+5]

Abstract

A technique is described whereby computer processors, used in conjunction with input/output (I/O) attachments, are provided with the ability to aid in the isolation of defective I/O circuit cards attached to the processor bus. The concept described herein provides a distinct addressing bit pattern, called a sleep mode, so that diagnostic operations can aid in the analysis and determination of faulty I/O circuit cards attached to a common bus. The concept is particularly useful in performing remote diagnostics, whereby the servicing may take place via telephone lines or radio frequency (RF) links, thereby isolating a faulty circuit card. Since many circuit cards, such as I/O attachment drivers, may be attached to a microprocessor bus, as shown in Fig. 1, any one or more of the circuit cards could develop a defect.

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Sleep Mode on Computer Processor Bus to Aid in Field Replaceable Unit Isolation

A technique is described whereby computer processors, used in conjunction with input/output (I/O) attachments, are provided with the ability to aid in the isolation of defective I/O circuit cards attached to the processor bus. The concept described herein provides a distinct addressing bit pattern, called a sleep mode, so that diagnostic operations can aid in the analysis and determination of faulty I/O circuit cards attached to a common bus. The concept is particularly useful in performing remote diagnostics, whereby the servicing may take place via telephone lines or radio frequency (RF) links, thereby isolating a faulty circuit card. Since many circuit cards, such as I/O attachment drivers, may be attached to a microprocessor bus, as shown in Fig. 1, any one or more of the circuit cards could develop a defect. This could inherently cause the entire microprocessor bus to hang up, so as to prevent the entire system from being operational. By developing a sleep mode diagnostic program, to be operational during diagnostic analysis, a sleep command with a unique address configuration sets the drives in one of the I/O circuit cards to a high impedance mode, isolating that individual circuit card from the microprocessor bus. While that card is in the sleep mode, diagnostic checks are performed on the remaining circuit cards attached to the bus. This procedure continues until the faulty ci...