FDC87W21 Ver la hoja de datos (PDF) - SMSC -> Microchip

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FDC87W21

Power I/O Controller with Fast Infrared Support

SMSC -> Microchip 

SYMBOL PIN

I/O

FUNCTION

nINDEX

81

INcs This schmitt input from the disk drive is active low when the head is

positioned over the beginning of a track marked by an index hole.

This input pin is pulled up internally by an approximately 1K ohm

resistor. The resistor can be disabled by bit 4 of CR6

(FIPURDWN).

nTRAK0

78

INcs Track 0. This schmitt input from the disk drive is active low when

the head is positioned over the outermost track. This input pin is

pulled up internally by an approximately 1K ohm resistor. The

resistor can be disabled by bit 4 of CR6 (FIPURDWN).

nWP

77

INcs Write protected. This active low schmitt input from the disk drive

indicates that the diskette is write-protected. This input pin is pulled

up internally by an approximately 1K ohm resistor. The resistor can

be disabled by bit 4 of CR6 (FIPURDWN).

nRDATA

74

INcs The read data input signal from the FDD. This input pin is pulled up

internally by an approximately 1K ohm resistor. The resistor can be

disabled by bit 4 of CR6 (FIPURDWN).

nDSKCHG 76

INcs Diskette change. This signal is active low at power on and

whenever the diskette is removed. This input pin is pulled up

internally by an approximately 1K ohm resistor. The resistor can be

disabled by bit 4 of CR6 (FIPURDWN).

nMOA

79

OD24 Motor A On. When set to 0, this pin enables disk drive 0. This is an

open drain output.

nMOB

80

OD24 Motor B On. When set to 0, this pin enables disk drive 1. This is an

open drain output.

nDSA

83

OD24 Drive Select A. When set to 0, this pin enables disk drive A. This is

an open drain output.

nDSB

84

OD24 Drive Select B. When set to 0, this pin enables disk drive B. This is

an open drain output.

VDD

15,

56

+5 Volt power supply for the digital circuitry

GND

25,

Ground

40,

65,

90

16

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