FDC87W22 查看數據表（PDF） - SMSC -> Microchip

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产品描述 (功能)

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FDC87W22

Power I/O Controller

SMSC -> Microchip 

SYMBOL

nINDEX

nTRAK0

nWP

nRDATA

nDSKCHG

nMOA

nMOB

nDSA

nDSB

VDD

GND

PIN

81

78

77

74

76

79

80

83

84

15, 56

25, 40

65, 90

I/O

INcs

INcs

INcs

INcs

INcs

OD24

OD24

OD24

OD24

FUNCTION

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).

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).

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).

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).

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).

Motor A On. When set to 0, this pin enables disk drive 0.

This is an open drain output.

Motor B On. When set to 0, this pin enables disk drive 1.

This is an open drain output.

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

This is an open drain output.

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

This is an open drain output.

+5 power supply for the digital circuitry

Ground

19

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