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2.0
THEORY OF OPERATIONS
2.1 General
Interface
Description
The
ST425
Winchester
supports
the
Seagate
ST506/412
Interface.
The interface
consists
of a 34 pin control
connector,
a
20 pin
read/write
connector
and a 4 pin DC connector.
The 34 pin connector
provides
10 control
signals
to the
drive
and returns
5 status
signals
to the controller.
The
20 pin
connector
handles
the
Modified
Frequency
Modulation
(MFM) data to/from the drive and supplies
the
drive-selected
status
to
the
controller.
The
4 pin
connector
provides
+5 and +12 Volts
DC.
In
general,
the
control
connector
is "daisy-chain"
terminated
throughout
the
user
system,
while
the
read/write
connector
is terminated
radially.
The
following
tables
indicate
the
ST425
interface
requir'ements.
5
..
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