FDC37C665IR Ver la hoja de datos (PDF) - SMSC -> Microchip
Número de pieza
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FDC37C665IR Datasheet PDF : 162 Pages
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PIN NO.
NAME
99 nMotor On 3
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 Receive Data
88
79 Transmit Data
81 nRequest to
Send
DESCRIPTION OF PIN FUNCTIONS
BUFFER
SYMBOL TYPE
DESCRIPTION
nMTR3
OD20 Motor On 3: Refer to Note 1.
PDRQ
DENSEL
nWRTPRT
nTR0
nINDEX
DRATE0,
DRATE1
O12
OD20
IS
IS
IS
O4
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).
MEDIA_ID0
MEDIA_ID1
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/IRRX
I
Receiver serial data input or IR data input.
TXD1
O2 Transmitter serial data output from Primary
Serial Port.
nRTS1
O2 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.
8
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