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FDC37C78 Scheda tecnica(PDF) 7 Page - Microchip Technology

Il numero della parte FDC37C78
Spiegazioni elettronici  Floppy Disk Controller
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Produttore elettronici  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

FDC37C78 Scheda tecnica(HTML) 7 Page - Microchip Technology

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7
DESCRIPTION OF PIN FUNCTIONS
PIN NO.
NAME
SYMBOL
BUFFER
TYPE
DESCRIPTION
38
Reset
RESET
IS
This active high signal resets the chip and
must be valid for 500 ns minimum. The effect
on the internal registers is described in the
appropriate
section.
The
configuration
registers are not affected by this reset.
FLOPPY DISK INTERFACE
21
Read Disk Data
nRDATA
IS
Raw serial bit stream from the disk drive, low
active.
Each falling edge represents a flux
transition of the encoded data.
27
Write
Data
nWDATA
OD20
This active low high current driver provides
the encoded data to the disk drive.
Each
falling edge causes a flux transition on the
media.
29
Head
Select
nHDSEL
OD20
This high current output selects the floppy
disk side for reading or writing. A logic "1" on
this pin means side 0 will be accessed, while
a
logic "0" means side 1 will be accessed.
33
Direction
Control
nDIR
OD20
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.
31
Step Pulse
nSTEP
OD20
This active low high current driver issues a
low pulse for each track-to-track movement of
the head.
20
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.
22,
23
DRVDEN 0,
DRVDEN 1
DRVDEN0,
DRVDEN1
OD20
Indicates the drive and media selected. Refer
to
configuration
registers
CR03,
CR0B,
CR1F.
24
Density Select
DENSEL
OD20
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.


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