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FDC37N3869-MD Datasheet(PDF) 10 Page - SMSC Corporation |
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FDC37N3869-MD Datasheet(HTML) 10 Page - SMSC Corporation |
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10 / 136 page  SMSC DS – FDC37N3869 Page 10 Rev. 10/25/2000 TQFP PIN # NAME SYMBOL BUFFER MODE 6 DESCRIPTION 8 nWrite Gate nWGATE (O12/ 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. 7 nWrite Data nWDATA (O12/ 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. 9 nHead Select nHDSEL (O12/ 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. 5 Direction Control nDIR (O12/ 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. 6 nStep Pulse nSTEP (O12/ OD12) This active low high current driver issues a low pulse for each track-to-track movement of the head. 15 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. This input is inverted and read via bit 7 of I/O address 3F7H. The nDSKCHG bit also depends upon the state of the Force Disk Change bits in the Force FDD Status Change configuration register (see section CR17 on page 107). 2 nDrive Select 0 nDS0 (O12/ OD12) Active low output selects drive 0. 100 nMotor On 0 nMTR0 (O12/ OD12) These active low output selects motor drive 0. 99 Drive Density 0 DRVDEN0 (O12/ OD12) Indicates the drive and media selected. Refer to configuration registers CR03, CR0B, CR1F. 12 nWrite Protected nWRTPRT IS This active low Schmitt Trigger input senses from the disk drive that a disk is write protected. Any write command is ignored. The nWRPRT bit also depends upon the state of the Force Write Protect bit in the Force FDD Status Change configuration register (see section CR17 on page 107). 11 wTrack 00 nTRK0 IS This active low Schmitt Trigger input senses from the disk drive that the head is positioned over the outermost track. 10 nIndex 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. 16 Drive Density 1 DRVDEN 1 (O12/ OD12) Indicates the drive and media selected. Refer to configuration registers CR03, CR0B, CR1F. SERIAL PORTS INTERFACE 86 Receive Data 2 RXD2 IS Receiver serial data input for port 2. IR Receive Data 87 Transmit Data 2 (Note 5) TXD2 O12PD Transmit serial data output for port 2. IR transmit data. 76 Receive Data 1 RXD1 I Receiver serial data input for port 1. 77 Transmit Data 1 TXD1 O12 Transmit serial data output for port 1. |
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Similar Description - FDC37N3869-MD |
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