Scanlab RTC 5 PC Interface Board Installation And Operation Manual page 584

15.3.2 Jumper Settings
®
Before installing the RTC 5 PC/104-Plus board in a
PC/104 stack, you might need to configure the
board's jumpers. SCANLAB ships RTC
boards in various jumper configurations (also see
"Type Identification", page 575). The jumpers are
soldered junctions and customers can subsequently
reconfigure them by using a soldering iron
If you do not want to change the factory settings,
proceed with "Installing the RTC
Board", page 587.
Caution!
• When altering a jumper configuration, take
care not to damage the board's electronics!
Jumper 17+18: Setting the Binary Stack
Address
Jumpers JP17+JP18 on the back side of the
®
RTC 5 PC/104-Plus board (see
page 578) allow the board's stack address to be
defined. You can thereby electrically customize the
board to its position in the PC/104 stack. SCANLAB
recommends assigning stack addresses as follows
(for an overview of PCI stack positions, see
on page 587):
PCI stack stack JP17
position address
1 0 * closed
2 1 closed
3 2 open
4 3 open
* default configuration
®
RTC 5 PC Interface Board
Rev. 1.9 e
®
15 Appendix A: The RTC 5 PC/104-Plus Board
Stack address configuration ensures that each
RTC
of the four CLK, IDSEL, REQ and GNT signals of the
PCI bus explicitly assigned to it:
®
5 PC/104-Plus
Stack
address
0
1
2
®
5 PC/104-Plus
3
Selection of the REQ and GNT signals is only relevant
for bus master boards. RTC
target devices and therefore not dependent on
master stack positions.
A configured stack address corresponding to the PCI
stack position ensures optimal relationships between
the signal path lengths (which differ for each PCI
stack position). This results in stable PCI-bus transfer
of assigned signals.
figure 62 on
Notes
• The RTC
figure 67
JP18
closed
open
closed
open
®
5 PC/104-Plus board in a stack gets to have one
CLK IDSEL
CLK0 IDSEL0
CLK1 IDSEL1
CLK2 IDSEL2
CLK3 IDSEL3
®
5 PC/104-Plus boards are
®
5 PC/104-Plus board's stack address is
factory-set to 0. If you install the board directly
onto a CPU board (without other modules in
between), then jumpers JP17+JP18 don't need
to be changed.
REQ GNT
REQ0 GNT0
REQ1 GNT1
REQ2 GNT2
REQ3 GNT3
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