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The parameter list is:
Byte 00
Byte 01
66 H
Trace control options
Bit 3
=
1
Single device tracing
Bit 2
=
I
Single buffer tracing (only
EXXX Ram area will be used)
Byte 02
Byte 03
Byte 04
Byte 05
Bit
I
=
1
SCSI status tracing
Bit 0
=
1
Command tracing
Single device address
00 H
00 H
00 H
The trace control options (byte 01) allow tuning of the trace
contents to locate the particular system interaction of interest.
Bit 3
Single device tracing
When set, the ACB-5500 will trace all appropriate interactions on
behalf of the LUN specified in byte 02.
The information will be
posted in RAM locations 8060-800F for the selected device.
Bit 1
SCSI status tracing
When set, SCSI status contents will be included in the trace of
activities.
Bit
(;3
SCSI command tracing
When set,
the SCSI command will be included in the trace of
activities.
If Byte 01 is 00, trace is inactive.
Any activation of a trace
function has a small unfavorable effect on performance of the
ACB-5580.
The trace is automatically inactivated by a power on
reset process.
Trace storage exists in RAM Locations C060-C00F.
To request a
trace dump, the host needs to send the controller diagnostic
send/receive command with the appropriate 'dump ram'
instruction.
Each trace entry consists of 2 bytes as follows:
Byte
7
6
5
4
3
2
1
STATICMOI
TRACE
INFORMATION
01
LUN 10 #
H.A.
10 #
Byte 00 H is the Trace Activity Indicator.
500504-00
6-48
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