FDC37C665GT(1994) Ver la hoja de datos (PDF) - SMSC -> Microchip

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FDC37C665GT
(Rev.:1994)

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

SMSC -> Microchip 

PIN NO.

NAME

1 Density Select

14 nWrite

Protected

13 nTrack 00

12 nIndex

19,18 Data Rate 0,

Data Rate 1

19,18 Media ID0,

Media ID1

78,88 Receive Data

79 Transmit Data

DESCRIPTION OF PIN FUNCTIONS

BUFFER

SYMBOL TYPE

DESCRIPTION

DENSEL

OD48

Indicates whether a low (250/300 Kb/s) or

high (500 Kb/s) data rate has been selected.

This is determined by the IDENT bit in

Configuration Register 3.

nWRTPRT

IS This active low Schmitt Trigger input senses

from the disk drive that a disk is write

protected. Any write command is ignored.

nTR0

IS This active low Schmitt Trigger input senses

from the disk drive that the head is

positioned over the outermost track.

nINDEX

IS This active low Schmitt Trigger input senses

from the disk drive that the head is

positioned over the beginning of a track, as

marked by an index hole.

DRATE0,

DRATE1

O24 These two outputs reflect bits 0 and 1

respectively of the Data Rate Register. At

power on, these two outputs are in a high

impedance state (refer to Table 50).

I

In Floppy Enhanced Mode 2 - These bits are

the Media ID 0,1 inputs. The value of these

bits can be read as bits 6 and 7 of the

Floppy Tape register.

SERIAL PORT INTERFACE

RXD1,

RXD2

I

Receiver serial data input.

TXD1

O4 Transmitter serial data output from Primary

Serial Port.

PCF0

I

FDC37C666GT (Adapter Mode): Parallel

Port Configuration Control 0. During reset

active this input is read and latched to

define the address of the Parallel Port.

9

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