參數(shù)資料
型號: FDC37C665IR
廠商: SMSC Corporation
英文描述: 3/5 Volt Advanced High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controller with Infranred Support
中文描述: 3 / 5伏先進的高性能多模并口超級I / O軟盤與Infranred支持磁盤控制器
文件頁數(shù): 8/162頁
文件大?。?/td> 562K
代理商: FDC37C665IR
8
DESCRIPTION OF PIN FUNCTIONS
PIN NO.
99
NAME
SYMBOL
nMTR3
BUFFER
TYPE
OD20
DESCRIPTION
nMotor On 3
PDRQ
O12
Motor On 3: Refer to Note 1.
In ECP Mode, MTR3 is the Parallel Port
DMA Request output. Active High.
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.
This active low Schmitt Trigger input senses
from the disk drive that a disk is write
protected. Any write command is ignored.
This active low Schmitt Trigger input senses
from the disk drive that the head is
positioned over the outermost track.
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.
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 53).
1
Density Select
DENSEL
OD20
14
nWrite
Protected
nWRTPRT
IS
13
nTrack 00
nTR0
IS
12
nIndex
nINDEX
IS
19,18
19,18
Data Rate 0,
Data Rate 1
Media ID0,
Media ID1
DRATE0,
DRATE1
MEDIA_ID0
MEDIA_ID1
O4
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
I
78
88
79
Receive Data
RXD1
RXD2/IRRX
TXD1
Receiver serial data input or IR data input.
Transmit Data
O2
Transmitter serial data output from Primary
Serial Port.
Active low Request to Send output for
Primary Serial Port. Handshake output
signal notifies modem that the UART is
ready to transmit data. This signal can be
programmed by writing to bit 1 of Modem
Control Register (MCR). The hardware
reset will reset the nRTS signal to inactive
mode (high). Forced inactive during loop
mode operation.
81
nRequest to
Send
nRTS1
O2
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參數(shù)描述
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