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FDC37C665IR Datasheet(PDF) 7 Page - SMSC Corporation |
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FDC37C665IR Datasheet(HTML) 7 Page - SMSC Corporation |
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7 / 162 page  7 DESCRIPTION OF PIN FUNCTIONS PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION 10 nWrite Gate nWGATE OD20 This active low high current driver allows current to flow through the write head. It becomes active just prior to writing to the diskette. 9 nWrite Data nWDATA OD20 This active low high current driver provides the encoded data to the disk drive. Each falling edge causes a flux transition on the media. 11 nHead Select nHDSEL OD20 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 ac- cessed. 7 Direction Control nDIR OD20 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. 8 nStep Pulse nSTEP OD20 This active low high current driver issues a low pulse for each track-to-track movement of the head. 17 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. 4,3 nDrive Select O,1 nDS0,1 OD20 Active low open drain outputs select drives 0-1. Refer to Note 2. 97 nDrive Select 3 I/O Address 10 nDS3 A10 0D20 I In non-ECP mode: Active low open drain output selects drive 3. Refer to Note 2. In ECP Mode, this pin is the A10 address input. 2,5 nMotor On 0,1 nMTR0,1 OD20 These active low open drain outputs select motor drives 0-1. Refer to Note 1. 96 Motor On 2 nMTR2 nPDACK OD20 I Motor On 2: Refer to Note 1. In ECP Mode, MTR2 is the Parallel Port DMA Acknowledge input. Active Low. |
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