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USB97CFDC2-01 Datasheet(PDF) 8 Page - SMSC Corporation |
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USB97CFDC2-01 Datasheet(HTML) 8 Page - SMSC Corporation |
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8 / 24 page  SMSC DS – USB97CFDC2-01 Page 8 Rev. 02-27-07 DATASHEET 5 PIN DESCRIPTIONS PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION FLOPPY DISK INTERFACE 75 Read Disk Data nRDATA IS Raw serial bit stream from the disk drive, low active. Each falling edge represents a flux transition of the encoded data. 69 Write Data nWDATA OD12 This active low high current driver provides the encoded data to the disk drive. Each falling edge causes a flux transition on the media. This pin is high impedance when nRESET is active low. 71 Head Select nHDSEL OD12 This high current output selects the floppy disk side for reading or writing. A logic "1" on this pin means side 0 will be accessed, while a logic "0" means side 1 will be accessed. . This pin is high impedance when nRESET is active low. 67 Direction Control nDIR OD12 This high current low active output determines the direction of the head movement. A logic "1" on this pin means outward motion, while a logic "0" means inward motion. This pin is high impedance when nRESET is active low. 68 Step Pulse nSTEP OD12 This active low high current driver issues a low pulse for each track-to-track movement of the head. This pin is high impedance when nRESET is active low. 76 Disk Change nDSKCHG IS This input senses that the drive door is open or that the diskette has possibly been changed since the last drive selection. 63 DRVDEN 0 DRVDEN 0 OD12 An active low on this pin indicates a disk drive spindle speed change from 300 RPM to 360 RPM or 1.2M format disks in three mode drives. This pin should be tied to the disk drives spindle speed control input pin. This pin is high impedance when nRESET is active low. 77 DRVDEN 1 DRVDEN1 OD12 Reserved for future use. 70 Write Gate nWGATE OD12 This active low high current driver allows current to flow through the write head. It becomes active just prior to writing to the diskette. This pin is high impedance when nRESET is active low. 73 Track 0 nTRK0 IS This active low Schmitt Trigger input senses from the disk drive that the head is positioned over the outermost track. 72 Index nINDEX IS This active low Schmitt Trigger input senses from the disk drive that the head is positioned over the beginning of a track, as marked by an index hole. 74 Write Protect nWRTPRT IS This active low Schmitt Trigger input senses from the disk drive that a disk is write protected. Any write command is ignored. 64 Motor On 0 nMTR0 OD12 This active low open drain output selects motor drive 0. This pin is high impedance when nRESET is active low. 65 Drive Select 0 nDS0 OD12 This active low open drain output selects drive 0. This pin is high impedance when nRESET is active low. |
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