Browse Prior Art Database

Communication Method between Devices through FDD Interface

IP.com Disclosure Number: IPCOM000115499D
Original Publication Date: 1995-May-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Fujihara, S: AUTHOR [+2]

Abstract

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.

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Communication Method between Devices through FDD Interface

      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.
  o  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.
  o  MFM endec decodes and encodes MFM data on Read/Write data line.
  o  Format Signal Generator generates FDD compatible format pattern
      such as Synch-pattern.