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FDC37C665GT Fiches technique(PDF) 8 Page - SMSC Corporation |
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FDC37C665GT Fiches technique(HTML) 8 Page - SMSC Corporation |
8 / 152 page 8 DESCRIPTION OF PIN FUNCTIONS PIN NO. NAME SYMBOL BUFFER TYPE DESCRIPTION 7 nDirection Control nDIR OD48 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 OD48 This active low high current driver issues a low pulse for each track-to-track movement of the head. 17 nDisk 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 OD48 Active low open drain outputs select drives 0-1. Refer to Note 2. 98 nDrive Select 2 nDrive Select 3 PDIR nDS2 nDS3 PDIR OD48 OD48 O4 Active low open drain output selects drives 2. Refer to Note 2. In non-ECP mode: Active low open drain output selects drive 3. Refer to Note 2. This bit is used to indicate the direction of the Parallel Port data bus. 0 = output/write 1 = input/read 97 nDrive Select 3 I/O Address 10 nDS3 A10 0D48 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 OD48 These active low open drain outputs select motor drives 0-1. Refer to Note 1. 96 nMotor On 2 nMTR2 nPDACK OD48 I Motor On 2: Refer to Note 1. In ECP Mode, nMTR2 is the Parallel Port DMA Acknowledge input. Active Low. 99 nMotor On 3 nMTR3 PDRQ OD48 O24 Motor On 3: Refer to Note 1. In ECP Mode, MTR3 is the Parallel Port DMA Request output. Active High. |
Numéro de pièce similaire - FDC37C665GT_07 |
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Description similaire - FDC37C665GT_07 |
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