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The
Slide
Servo
block
drives
a
slide
motor
(flat
linear
motor)
to
access
the
designated
track
when
seeking.
3.5
Bias
Magnet
Control Block
This block
flips
a
bias
magnet and senses
its
polarity to
provide
an
erasing bias
magnetic
field
with
opposite
polarity to that of writing bias.
3.5
Loading Block
The
Loading
blod<
consists
of
a
loading
motor
the
switches
to
load
and
eject
a
cartridge.
3.7
MPU
Block
The
MPU
block consists
of
an
MPU
(uPD78310).
16K
bytes
P-ROM
and
2K
bytes
RAM.
This
block supervises the
drive
and
controls the
analog
blocks,
mechanical
blocks
and
the
ESDI.
Most
of
the
control
lines
are transferred
via
the
iOP
block.
However,
part of
the
servo
control
signal
is
connected
directly to
the
MPU.
A
real
time monitor
program
manages
each
task
of
the
control.
0
3.8
IOP
Block
The IOP
(Input
/
Output Processor)
block provides the control
lines to
the
analog
blocks,
mechanical
blocks
and
so
on.
The IOP
block also
handles
the
ESDI
control
handshakes.
3.9
MDA
Block
The
MDA
(Modulator,
Demodulator
&
Address decoder)
block performs
encoding
and
decoding
the (2,7)RLL
and
detecting the
read
address
in
the
ID's of
the
disk.
The encoded
channel
clock
rate
is
14.797
MHz
at
2400
rpm.
The
SYNC
and
RESYNC
in
the format are
encoded
in
this
block.
The
MDA
block
provides the
laser drive
block
with
the
control signals
for
laser
power
modes, and
provides
the
RF
block with
a
switch signal
for
the
equalizer.
1
7
Section
3:
System
Configuration
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