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Sony CDU-541 - Page 19

Sony CDU-541
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CDU-541
CD-ROM
DRIVE
SCSI
INTERFACE
MANUAL
NO
OPERATION
08h.
This
message
is
sent
from
an
initiator
in
response
to
a
the
controller's
request
for
a message
when
the
initiator
does
not
currently
have any
other
valid
message
to
send.
MESSAGE
PARITY
ERROR
09h.
This
message
is
sent
from
the
initiator
to
the
controller
to
indicate
that
one
or
more
bytes
in
the
last
message
it
received
had a
parity
error.
In
order
to
indicate
its
intentions
of
sending
this
message,
the
initiator
shall
assert
the
ATN
signal
prior
to
its
release
of
ACK
for
the
REQ/ACK
handshake
of
the
message
that
has
the
pari
ty
error.
This
provides
an
interlock
so
that
the
controller
can
determine
which message
has
the
parity
error.
If
the
controller
receives
this
message
under
any
other
circumstance,
it
will
signal
a
catastrophic
error
condition
by
releasing
the
BSY
signal
without
any
further
information
transfer
attempt.
LINKED
COMMAND
COMPLETE
OAb.
the
initiator
to
indicate
that
and
that
status
has
been
sent.
the
initial
state
for
the
next
This
message
is
sent
from
the
controller
to
an
the
execution
of
a
linked
command
has
completed
The
initiator
shall
then
set
the
pointers
to
linked
command.
LINKED
COMMAND
COMPLETE
(WITH
FLAG)
OBh.
This
message
is
sent
from
the
controller
to
an
initiator
to
indicate
that
the
execution
of
a
linked
command
(with
the
flag
bit
set
to
one)
has
completed
and
that
status
has
been
sent.
The
initiator
shall
then
set
the
pointers
to
the
initial
state
of
the
next
linked
command.
Typically
this
message would be
used
to
cause
an
interrupt
in
the
initiator
between two
linked
commands.
BUS
DEVICE
RESET
0Ch.
This
message
is
sent
from
an
initiator
to
direct
the
controller
to
clear
all
current
commands
on
that
SCSI
device.
This
message
forces
the
SCSI
device
to
an
initial
state
with
no
operations
pending
for
any
initiator.
Upon
recognizing
this
message,
the
controller
will
go
to
the
BUS
FREE
phase.
IDENTIFY
BOh
to
FFh.
These
messages
are
sent
by
either
the
initiator
or
the
controller
to
establish
the
physical
path
connection
between
an
initiator
and
controller
for
a
particular
logical
unit.
The
logical
unit
number
addresses
one
physical
drive
attached
to
the
controller.
Bit
7.
This
bit
shall
be
set
to
one
to
distinguish
these
messages from
the
other
messages.
Bit
6.
This
bit
is
only
set
to
one
by
the
initiator
to
grant
the
the
privilege
of
disconnecting.
If
this
bit
is
zero,
the
controller
will
not
disconnect.
This
bit
is
set
to
zero
when
the
identify
message
is
sent
by
the
controller.
Bits
5-3.
Reserved.
Bits
2-0.
These
bits
specify
the
logical
unit
number
in
the
controller.
4-9

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