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Real Time Data Diagnostic Wrap of Variable Frequency Oscillator Data Separator Using a Microcontroller

IP.com Disclosure Number: IPCOM000087470D
Original Publication Date: 1977-Feb-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 73K

Publishing Venue

IBM

Related People

Dixon, JD: AUTHOR [+2]

Abstract

It is desirable that a diskette file unit attachment have the capability of checking out its data flow and data separating hardware in order to improve upon its diagnostic fault isolation capabilities. This approach allows a real-time simulation of testing the data flow and data separator logic using a microprocessor (controller) and a minimal amount of control logic. This technique simulates many sequences vital to accessing data on a floppy diskette, such as writing, reading, and synchronizing on Address Mark fields. The diskette attachment is required to "synch" upon an Address Mark field prior to reading data from a diskette.

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Real Time Data Diagnostic Wrap of Variable Frequency Oscillator Data Separator Using a Microcontroller

It is desirable that a diskette file unit attachment have the capability of checking out its data flow and data separating hardware in order to improve upon its diagnostic fault isolation capabilities. This approach allows a real-time simulation of testing the data flow and data separator logic using a microprocessor (controller) and a minimal amount of control logic. This technique simulates many sequences vital to accessing data on a floppy diskette, such as writing, reading, and synchronizing on Address Mark fields. The diskette attachment is required to "synch" upon an Address Mark field prior to reading data from a diskette. The particular approach to a data wrap test, as illustrated in the figure, incorporates a microprocessor 1 serving as a controller and uniquely interacting by utilizing a microprogram with control hardware to achieve the desired result.

The first phase of the sequence involves the writing of data from the microprocessor 1 into the serializer/deserializer 2 and eventually into the "Customer Engineer (CE) Diagnostic Data" port of the data separator variable frequency oscillator (VFO) card 3 contained in the file. Microprocessor 1 and accompanying hardware simulate an AM synch sequence substituting CE diagnostic data for the normal file data and providing the correct timing of the control times to the data separator card 3. During the second phase of the test, the data flow is reversed and the standardized data from the VFO card 3 is deserialized, then read in by microprocessor 1.

The data has been preassigned so that t...