Adaptec 1542B User Manual - Page 4

initialization

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Section Two Preparation and Configuration 2.3.1 Jumper Block J5 Jumper block J5 is shown below: - J9 must also be set - J9 must also be set Interrupt Channel 0 -1 DMA Channel 0 DMA Channel 1 SCSI Address ID2 SCSI Address ID1 I .-- c'i O 0 0 cr• ca) a a) a a) CO CCl) to tO5 0 a • E' 0 a'=_ '6 Z' cCl) ,-< MCD Ccl) < mCD 0 0 0 0 0 00 x 0 x 0 0 0 J5 0 0 0 0 0 0 0 x 0 x 0 0 0 x = Jumper Installed Jumper block J5 is the large horizontally-oriented block of jumpers located under the internal 50-pin connector J2. Pin pair 1 is the leftmost pair of pins. 2.3.1.1 SCSI Synchronous Negotiation Pin-pair 1 of jumper block J5 is the synchronous negotiation enable jumper. The AHA-1540B/1542B will initiate SCSI synchronous negotiation during initialization, or after a SCSI reset if this jumper is installed. If the jumper is not installed, the AHA-1540B/1542B will still support synchronous SCSI transfers, but a different SCSI device must initiate the negotiation. Default is jumper removed, synchronous negotiation initiation disabled. If any attached AHA-15408/1542B 2-3 adaptec

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Section
Two
Preparation
and
Configuration
2.3.1
Jumper
Block
J5
Jumper
block
J5
is
shown
below:
SCSI
Address
ID1
SCSI
Address
ID2
DMA
Channel
0
—
J9
must
also
be
set
DMA
Channel
1
Interrupt
Channel
0
—
1
—
J9
must
also
be
set
I
O
0
.--
c‘i
a
0
cr•
a)
a
c
a) a)
Cl)
C C
O
to
tO
5
0
0
c c
a a
Cl)
Cl)
,--
•
=
‘_
<
<
'6
E'
Z'
CD
CD
M
m
0
0
0 0
0
0 0
x
0
x
0
0
0
J5
0
0 0 0
0
0 0
x
0
x
0
0
0
x
=
Jumper Installed
Jumper
block
J5
is
the
large
horizontally
-oriented
block
of
jumpers
located
under
the
internal
50
-pin
connector
J2.
Pin
pair
1
is
the
leftmost
pair
of
pins.
2.3.1.1
SCSI
Synchronous
Negotiation
Pin
-pair
1
of
jumper
block
J5
is
the
synchronous
negotiation
enable
jumper.
The
AHA-1540B/1542B
will
initiate
SCSI
synchronous
negotiation
during
initialization,
or
after
a
SCSI
reset
if
this
jumper
is
installed.
If
the
jumper
is
not
installed,
the
AHA-1540B/1542B
will
still
support
synchronous
SCSI
transfers,
but
a
different
SCSI
device
must
initiate
the
negotiation.
Default
is
jumper
removed,
synchronous
negotiation
initiation
disabled.
If
any
attached
AHA-15408/1542B
2-3
adaptec