FDC37C666GT(1994) Ver la hoja de datos (PDF) - SMSC -> Microchip

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FDC37C666GT
(Rev.:1994)

High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controllers

SMSC -> Microchip 

PIN NO.

NAME

24 nIDE High Byte

Enable

DESCRIPTION OF PIN FUNCTIONS

BUFFER

SYMBOL TYPE

DESCRIPTION

nIDEENHI

O8 This signal is active low only in the AT

mode, and when IO16CSB is also active.

The I/O addresses for which this pin reacts

are 1F0H-1F7H in primary address mode or

170H-177H in secondary address mode.

This pin is not used in XT mode.

S1CF0

25 nHard Disk Chip nHDCS0

Select

I

FDC37C666GT (Adapter Mode): Primary

Serial Configuration 0. Read and latched

during reset active to define the address of

the Secondary Serial Port.

O24 This is the Hard Disk Chip select

corresponding to addresses 1F0H-1F7H in

primary address mode or 170H-177H in

secondary address mode in the AT mode

and addresses 320H-323H in the XT mode.

IDEACF

26 nHard Disk Chip nHDCS1

Select

FDC37C666GT (Adapter Mode): IDE

I

Address Control. Refer to FDC37C666GT

hardware configuration for more

information. Read and latched during

reset active.

O24 This is the Hard Disk Chip select

corresponding to 3F6H,3F7H for primary

address mode or 376H,377H for secondary

address mode in the AT mode and

addresses 3F6H,3F7H in the XT mode.

FACF

27 nI/O 16 Bit

Indicator

nIOCS16

FDC37C666GT (Adapter Mode): Floppy

I

Disk Address Control.

Refer to

FDC37C666GT hardware configuration for

more information. Read and latched during

reset active.

I

This input indicates, in AT mode only, when

16 bit transfers are to take place. This

signal is generated by the hard disk

interface. Logic "0" = 16 bit mode; logic "1"

= 8 bit mode.

nHDACK

I

In the XT mode, this is the Hard Disk

Controller DMA Acknowledge, low active.

16

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