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

84,86 nRing Indicator

94 Drive 2

DESCRIPTION OF PIN FUNCTIONS

BUFFER

SYMBOL TYPE

DESCRIPTION

nRI1, nRI2

I

Active low Ring Indicator input for primary

and secondary serial ports. Handshake

signal which notifies the UART that the

telephone ring signal is detected by the

modem. The CPU can monitor the status of

nRI signal by reading bit 6 of Modem Status

Register (MSR). A nRI signal state change

from low to high after the last MSR read will

set MSR bit 2 to a 1. If bit 3 of Interrupt

Enable Register is set, the interrupt is

generated when nRI changes state. Note:

Bit 6 of MSR is the complement of nRI.

DRV2

I

In PS/2 mode, this input indicates whether a

second drive is connected; DRV2 should be

low if a second drive is connected. This

status is reflected in a read of Status

Register A. (Only available in

FDC37C665GT. This pin must not be

driven in the FDC37C666GT)

nADRx

nADRx

O24 Optional I/O port address decode output.

Refer to Configuration registers CR3, CR8

and CR9 for more information. Active low.

(Available in FDC37C665GT and

FDC37C666GT.) Defaults to tri-state after

power-up. This pin has a 30µa internal pull-

up.

Parallel Port

Interrupt

Request 2

PINTR2

O24 This interrupt from the Parallel Port is

enabled/disabled via bit 4 of the Parallel

Port Control Register.

Refer to

configuration registers CR1 and CR3 for

more information.

ECPEN

I

FDC37C666GT (Adapter Mode): Enhanced

Parallel Port mode select. Refer to

FDC37C666GT hardware configuration for

more information. Read and latched during

reset active.

PARALLEL PORT INTERFACE

13

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