CDU-54!
CD-ROM
DRIVE
SCSI
INTERFACE
MANUAL
5.2.32.
SEND
DIAGNOSTIC
Command
==============================================================================
Bit:
7
6
5
4
3
2 !
o
Byte
1
==============================================================================
o : Opera
tion
Code (!Dh) :
-----1-----------------------------------------------------------------------1
1 I
Logical
Unit
Number :
Reserved
:
SelfTest
I
Reserved
:
-----------------------------------------------------------------------:
2
Reserved
I
I
------------------------------------------------~----------------------1
3
(MSB)
I
I
Parameter
List
Length
4
---I
(LSB)
:
-----------------------------------------------------------------------1
5 1
Control
Byte
1
==============================================================================
The
SEND
DIAGNOSTIC
command
requests
the
controller
to
perform
diagnostic
tests
on
itself,
on
the
attached
peripheral
devices,
or
on
both.
Except
when
the
self-test
bit
is
one,
this
command
is
usually
followed
by
a
RECEIVE
DIAGNOSTIC
RESULTS
command.
A
self-test
bit
of
one
directs
the
controller
to
complete
its
default
self-
test.
If
the
self-test
is
requ~sted,
the
parameter
list
length
shall
be
set
to
zero.
If
the
self-test
bit
is
set
to
one and
the
parameter
list
length
is
not
zero,
the
comm~~d
will
be
terminated
with
CHECK
CONDITION
status.
The
sense
key
is
set
to
ILLEGAL
REQUEST
and
the
additional
sense
code
set
to
INVALID
VALUE
IN
COB.
The
controller
will
not
disconnect
during
self-test.
If
the
self-test
does
not
fail,
the
command
will
be
terminated
with
a
GOOD
status;
otherwise,
the
command
will
be
terminated
with
CHECK
CONDITION
status
and
the
sense
key
will
be
set
to
HARDWARE
ERROR.
The
parameter
list
length
specifies
the
length
in
bytes
of
the
parameter
list
that
will
be
transferred
during
the
DATA
OUT
phase.
A
parameter
list
length
of
zero
indicates
that
no
data
will
be
transferred.
This
condition
will
not
be
considered
as
an
error.
If
the
self-test
is
not
requested
the
controller
will
return
GOOD
status
upon
receiving
a
valid
command
descriptor
block
and
parameter
list.
The
parameter
list
length
is
set
to
eight
if
user
specified
diagnostics
are
requested.
The
results
of
the
diagnostic
test
are
returned
to
the
initiator
by
a
RECEIVE
DIAGNOSTICS
RESULTS
command.
5-58
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