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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, Thomwood. 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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`HUAWEI EX. 1009 - 1/2
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`HUAWEI EX. 1009 - 1/2
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`“re Technical Disclosure Bulletin Vol.38 No.05 May1995W
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`Communication Method between Devices through FDD Interface
`
`Pseudo FDD device
`
`+———————————————+
`
`----------+
`
`
`
`+————————————+
`
`FDD
`<rl+l ------- Host
`.._._.._..____-> Controller
`FDD
`interface +------------+
`
`+--~ Address
`
`Generator
`+------+———————— +
`|
`+------+---------------4'
`HEM endec
`
`
`+ ------------------ +-——+
`+--------------- +
`
`Serial/
`Parallel
`nverter‘
`+———————————————+
`+—-—------—----——+
`
`+ ————————+
`
`Target ~-
`
`Device
`+~-——----+
`
`
`
`+-~-
`
`
`
`r~+
`
`
`
`’
`
`
`+-—- Format Signal
`Generator
`+———————————————+
`
`
`
`--+
`
`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 a 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.
`'
`'
`
`- MFM endec decodes and encodes MFM data on Read/Write data line.
`
`- Format Signal Generator generates FDD compatible format pattern such as Synch-pattem.
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`© IBM Corp. 1895
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`HUAWEI EX. 1009 - 2/2
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`HUAWEI EX. 1009 - 2/2
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