Technical Disclosure Bulletin Vol. 38 No.05 May 1995
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`VOLUME 38 - NUMBER 05 - MAY 1995
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`IBM Technical Bulletin is published monthly by International Business Machines Corporation, Thornwood, NY 10594.
`Officers: Louis V. Gerstner, In, Chairman of the Board 8: CEO; Jerome 3. York. Senior Vice President & CFO; Donate A. Evangelism.
`Senior Vice President & General Counsel; John E. Hickey, Vice President. Secretary & Assistant General Counsel; Vynetta W. Ross. Editor.
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`Thornwood, NY 10594.
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`©Copyright International Business Machines Corporation 1995. Printed in the U.S.A. The publication of these technical disclosures does
`not constitute a grant of any licensing under patent.
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`OLYMPUS EX. 1009 - 1/2
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`Eager;- Technical Disclosure Bulletin vm. 33 No.05 May1995Wm
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`Communication Method between Devices through FDD Interface
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`pseudo FDD device
`—..“u.—_-—.—-_——-uq.¢-——__—_—————_———_—___.__ -—..._.._-
`+__q_____--_*---+
`
`---------~+
`
`
`+--- Address
`
`Generator
`+—-——---——--——+
`+------+——-——-—--+
`|
`FDD
`+----~-+---------------+
`
`HR-l endec
`<‘[+] ------* Host
`
`-------—*--> Controller
`+-———-——-----—-—---§-———+
`FDD
`+--*--j-----~--+
`Interface +-----------~+
`
`Serial/
`Parallel
`Converter
`+----------—-——~+
`+---——--—------—-+
`
`_
`
`+--------+
`
`Target
`
`VlCe
`+—-—-----+
`
`"e
`
`+---
`
`
`
`
`
`--+
`
`
`
`
`+--- Format Signal
`Generator
`+__a__—____—-_—_¢
`
`
`
`-+
`
`Disclosed is a method for communicating between devices through Floppy Disk Drive (FDD)
`. Interface which can be implemented via serial data lines, such as Write Data and Read Data. The
`FDD Host Controller compares a requested address and 3. address from the FDD in Read/Write
`operation. Only when the addresses are matched, the FDD Host Controller reads data on the
`data frame preceded by the address or Writes data there.
`In the communication method through
`the FDD Interface, the sector data from the FDD, such as ID and DATA field information, are
`handled as packet data; ID field as packet header and data field as packet data. The packet header
`has the packet attributes to indicate data type in the packet data. The Figure shows the block
`diagram of the subject method.
`
`6 Address Generator generates the address information compatible with FDD ID information.
`It indicates packet attribute; Command Packet, Status Packet, Device Information Packet and
`Data Packet.
`'
`-
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`- MFM endec decodes and encodes MFM data on Read/Write data line.
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`- Format Signal Generator generates FDD compatible format pattern such as Synch—patterrr.
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`© lBM Corp. 1995
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`OLYMPUS EX. 1009 - 2/2
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