Adaptec 1542B User Manual - Page 5

AHA-154XB.

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Section Two Preparation and Configuration SCSI devices support synchronous transfer, the initiation of negotiation should be enabled by the AHA-154X or the attached synchronous device(s) to implement the synchronous data transfer speed on the SCSI bus. 2.3.1.2 Diagnostic Jumper Pin-pair 2 of jumper block J5 is a factory diagnostic jumper. This jumper is reserved for Adaptec use and must not have a jumper shunt installed. If this jumper is installed, the firmware will loop through the power on diagnostics, preventing normal operation. Default is jumper removed. 2.3.1.3 SCSI Parity Pin-pair 3 of jumper block J5 is the parity enable/disable jumper. The SCSI parity checking is disabled if this jumper is installed. The default is parity checking enabled, jumper removed. 2.3.1.4 SCSI Address Pin-pairs 4, 5, and 6 of jumper block J5 define the SCSI address of the AHA-154XB. The SCSI address is selected according to the following table. The default address is 7 (no jumpers installed). SCSI ID bit 2 _c) 0 0 0 0 (i) 0 0 0 0 0 0 0 x 0 0 0 0 0 0 0 0 0 0 0 0 x 0 0 0 0 0 PIN-PAIR 45 6 00 0 x0 0 0x 0 xx 0 00 x x0 x 0x x xx x SCSI ADDRESS 7* 6 5 4 3 2 1 0 x = Jumper Installed Default AHA-1540B/1542B 2-4 adaptec

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Section
Two
Preparation
and
Configuration
SCSI
devices
support
synchronous
transfer,
the
initiation
of
negotiation
should
be
enabled
by
the
AHA-154X
or
the
attached
synchronous
device(s)
to
implement
the
synchronous
data
transfer
speed
on
the
SCSI
bus.
2.3.1.2
Diagnostic
Jumper
Pin
-pair
2
of
jumper
block
J5
is
a
factory
diagnostic
jumper.
This
jumper
is
reserved
for
Adaptec
use
and
must
not
have
a
jumper
shunt
installed.
If
this
jumper
is
installed,
the
firmware
will
loop
through
the
power
on
diagnostics,
preventing
normal
operation.
Default
is
jumper
removed.
2.3.1.3
SCSI
Parity
Pin
-pair
3
of
jumper
block
J5
is
the
parity
enable/disable
jumper.
The
SCSI
parity
checking
is
disabled
if
this
jumper
is
installed.
The
default
is
parity
checking
enabled,
jumper
removed.
2.3.1.4
SCSI
Address
Pin
-pairs
4,
5,
and
6
of
jumper
block
J5
define
the
SCSI
address
of
the
AHA-154XB.
The
SCSI
address
is
selected
according
to
the
following
table.
The
default
address
is
7
(no
jumpers
installed).
_c)
0
0
0
0
(i)
0 0 0 0
0
0 0
0
0
0
SCSI
ID
bit
2
0
0
0
x
0 0
0 0
0
0
x
0
0 0 0 0
PIN
-PAIR
4
5
6
SCSI
ADDRESS
0
0
0
7*
x
0
0
6
0
x
0
5
x
x
0
4
0
0
x
3
x
0
x
2
0
x
x
1
x
x
x
0
x
=
Jumper
Installed
Default
AHA-1540B/1542B
2-4
adaptec