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

PD7

nRESIDE

IRQ_G

DRQ_D

IRSL2

nIDBEN

IRQ_H

IRSL2

nDACK_N

IRRXH/

IRSL0

nCS1

IRTX2

nCS0

IRRX2

nWE

nDIR

nHEAD

nRWC

nWD

nSTEP

PIN

I/O

FUNCTION

17

I/O24t PRINTER MODE: PD7

Parallel port data bus bit 7. Refer to the description of the parallel

port for the definition of this pin in ECP and EPP mode.

-

EXTENSION FDD MODE: This pin is a tri-state output.

I/O24t EXTENSION ADAPTER MODE: XD7

This pin is system data bus D7 for the Extension Adapter.

OD24 EXTENSION 2FDD MODE: nDSA2

This pin is for Extension FDD A; its function is the same as that of

the nDSA pin.

-

JOYSTICK MODE: NC pin

IDE AND FDC INTERFACE

1 OUT12t When CR16 Bit 1 (IRIDE) = 0: Active low reset signal for IDE;

OUT12t When CR16 Bit 1 (IRIDE) = 1: Interrupt request signal G.

OUT12t DMA request signal.

OUT12t IR module mode select 2.

91 OUT12t When CR16 Bit 1 (IRIDE) = 0: Active low enable signal for IDE;

OUT12t When CR16 Bit 1 (IRIDE) = 1: Interrupt request signal H.

OUT12t IR module mode selection 2.

INt DMA acknowledge signal D.

I/O12t When input selected, act as high speed IR receiving terminal.

When output selected, act as IR module mode selection 0.

95 OUT12t When CR16 Bit 1 (IRIDE) = 0: This pin is used to select the IDE

controller. nCS1 decodes the HDC addresses specified in CR22.

OUT12t When CR16 Bit 1 (IRIDE) = 1: Function as a InfraRed transmission

data line.

94 OUT12t When CR16 Bit 1 (IRIDE) = 0: This pin is used to select the IDE

controller. nCS0 decodes HDC addresses specified in CR21.

INt When CR16 Bit 1 (IRIDE) = 1: Function as a InfraRed receiving

line.

85

OD24 Write enable. An open drain output.

89

OD24 Direction of the head step motor. An open drain output.

Logic 1 = outward motion

Logic 0 = inward motion

88

OD24 Head select. This open drain output determines which disk drive

head is active.

Logic 1 = side 0

Logic 0 = side 1

87

OD24 Reduced write current. This signal can be used on two-speed disk

drives to select the transfer rate. An open drain output.

Logic 0 = 250 Kbps

Logic 1 = 500 Kbps

When bit 5 of CR9 (EN3MODE) is set to high, the three-mode

FDD function is enabled, and the pin will have a different definition.

Refer to the EN3MODE bit in CR9.

86

OD24 Write data. This logic low open drain writes precompensation serial

data to the selected FDD. An open drain output.

82

OD24 Step output pulses. This active low open drain output produces a

pulse to move the head to another track.

15

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