参数资料
型号: 37C669
厂商: SMSC Corporation
英文描述: DIODE SCHOTTKY SINGLE 25V 200mW 0.5V-vf 200mA-IFM 30mA-IF 2uA-IR SOD-323 3K/REEL
中文描述: 电脑98/99顺从超级I / O软盘控制器与红外线支持
文件页数: 143/164页
文件大小: 621K
代理商: 37C669
8
DESCRIPTION OF PIN FUNCTIONS
QFP/
TQFP
PIN NO.
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
7
Direction
Control
nDIR
OD48
This
high
current
low
active
output
determines
the
direction
of
the
head
movement.
A logic "1" on this pin means
outward motion, while a logic "0" means
inward motion.
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
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
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