Adaptec 1542B User Manual - Page 9

Preparation, Configuration, adaptec

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Section Two Preparation and Configuration J9 0 x 000x Ox 000x C O T- CV 'I' LO CD CD CD CD C C C C C C CCCCCC ( CO CO CO CD CO 8 8- 8cr Qcr •cr cc cr 000 Ox 0 00 0000x 000 x = Jumper Installed IRQ 9, 10, 11, 12, 14, 15 - connects the interrupt line to the AT bus. One of these jumpers must be installed in order for the AHA154XB to interrupt the Host. The jumper selected must match the interrupt channel setting in J5. 2.3.1.7 DMA Transfer Speed Default Pin-pairs 12 and 13 of jumper block J5 set the default DMA transfer speed. Installing jumper shunts as shown below will set any of four default DMA transfer speeds. (See Appendix A for system timing requirements.) The default speed is selected after power on or after a hard reset occurs. This speed may also be tuned to allow for the fastest possible transfer (minimum bus on time) for any particular system by using the Host Adapter command Set Transfer Speed. The Host Adapter command overrides the jumper settings. The default is no jumper installed. AHA-15408/15428 2-8 adaptec

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Section
Two
Preparation
and
Configuration
O
T
-
CV
'I'
LO
CD
CD
CD
CD
C
C
C
C
C
C
(
CCCCCC
CO
CO
CO
CD
CO
8
-
8
-
8
Q
cr cr
cr
•
cc
cr
J9
0
x
000x
000
Ox
0
00
Ox
000x
0000x
000
C
x
=
Jumper
Installed
IRQ
9,
10,
11, 12,
14,
15
—
connects
the
interrupt
line
to
the
AT
bus.
One
of
these
jumpers
must
be
installed
in
order for
the
AHA-
154XB
to
interrupt
the
Host.
The
jumper
selected
must
match
the
interrupt
channel
setting
in
J5.
2.3.1.7
DMA
Transfer
Speed
Default
Pin
-pairs
12
and
13
of
jumper
block
J5
set
the
default
DMA
transfer
speed.
Installing
jumper
shunts
as
shown
below
will
set
any
of
four
default
DMA
transfer
speeds.
(See
Appendix
A
for
system
timing
requirements.)
The
default
speed
is
selected
after
power
on
or
after
a
hard
reset
occurs.
This
speed
may
also
be
tuned
to
allow
for
the
fastest
possible
transfer
(minimum
bus
on
time)
for
any
particular
system
by
using
the
Host
Adapter
command
Set
Transfer
Speed.
The
Host
Adapter
command
overrides
the
jumper
settings.
The
de-
fault
is
no
jumper
installed.
AHA-15408/15428
2-8
adaptec