Technical Disclosure Bulletin
`: Vol. 38 No. 05 May 1995
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`
`
`VOLUME 38 - NUMBER 05 - MAY 1995
`
`IBM Technical Bulletin is published monthly by International Business Machines Corporation, Thomwood, NY 10594.
`Officers: Louis V. Gerstner, Jr., Chairman of the Board & CEO; Jerome B. York, Senior Vice President & CFO; Donato A. Evangelista,
`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,
`
`©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 underpatent.
`
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`© IBM Corp.
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`25:2 Technical Disclosure Bulletin
`
`Vol. 38 No. 05 May 1995
`
`Communication Method between Devices through FDDInterface
`
`pseudo FDD device
`
`|
`
`|-~-
`
`tennnnann+
`
`
`Target
`Device
`tomo
`
`+
`$oeea
`
`
`+---| Address|--~~------+
`Generator
`+-~-+—-==+
`$a—nne+———————..+
`i
`|
`FDD
`tassaeeForen+
`MFM endec
`<-[+]------- Host
`
`
`~---~=----->| Control ler
`Interface +------------+
`
`ta-—------~~. +—-—-+
`Serial/
`teaaaaaa +
`Parallel
`Converter
`ta-+----+
`tonne
`
`+--~| Format Signa]
`Generator
`tras~~+
`
`+---|
`
`
`
`|
`ot
`
`
`
`|--+
`
`
`
`Disclosed is a method for communicating between devices through Floppy Disk Drive (FDD)
`Interface which can be implementedvia 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 DATAfield information, are
`handled as packet data; ID field as packet header and datafield 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.
`* 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 dataline.
`* Format Signal Generator generates FDD compatible format pattern such as Synch-pattern.
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`© IBM Corp. 1995
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