FDC37C669 View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
Manufacturer
FDC37C669 Datasheet PDF : 162 Pages
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DESCRIPTION OF PIN FUNCTIONS
QFP/
TQFP
PIN NO.
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
8 nStep Pulse
nSTEP
OD48
This active low high current driver issues a low
pulse for each track-to-track movement of the
head.
17 Disk Change
nDSKCHG
IS This input senses that the drive door is open
or that the diskette has possibly been changed
since the last drive selection. This input is
inverted and read via bit 7 of I/O address
3F7H.
4,3 nDrive Select O,1 nDS0,1
OD48 Active low open drain outputs select drives 0-
1.
2,5 nMotor On 0,1 nMTR0,1
OD48 These active low open drain outputs select
motor drives 0-1.
1 DRVDEN0
DRVDEN0
OD48 Indicates the drive and media selected. Refer
to configuration registers CR03, CR0B, CR1F.
14 nWrite
Protected
nWRTPRT
IS This active low Schmitt Trigger input senses
from the disk drive that a disk is write
protected. Any write command is ignored.
13 wTrack 00
nTRK00
IS This active low Schmitt Trigger input senses
from the disk drive that the head is positioned
over the outermost track.
12 nIndex
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.
18 DRVDEN1
DRVDEN 1
OD48 Indicates the drive and media selected. Refer
to configuration registers CR03, CR0B, CR1F.
SERIAL PORT INTERFACE
88 Receive Data 2 RXD2/IRRX
I
Receiver serial data input for port 2. IR
Receive Data
89 Transmit Data 2 TXD2/IRTX
78 Receive Data 1 RXD1
79 Transmit Data 1 TXD1
O24 Transmit serial data output for port 2. IR
transmit data.
I
Reciever serial data input for port 1.
024 Transmit serial data output for port 1.
8
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