Open Access
Summary of Jumpers and Links
D-2
ARM Development Board (ARM7TDMI Version)
Hardware Reference Guide
ARM DUI 0017C
D.1 Overview
The ARM Development Card is configurable through the use of links, jumpers and switches.
Each of these is described in detail in
Chapter 3, Circuit Descriptions
. This section
summarises that information.
Surface mount links are used where an option should only be changed for a special
purpose. You may need to move these links if you are modifying
the ARM Development Card to add additional hardware.
Standard 2-pin links are used for infrequently used options. You should only insert or
remove the jumpers if you are sure of the effect.
DIP switches are used where the you may frequently want to make changes.
You cannot stop the ARM Development Card functioning by
altering the switch positions.
The default positions are denoted by a *.
D.2 Surface Mount Links
Ref Name Position Description
LK1 NISA clock select A
C
* 32MHz
24MHz
LK2 SYSCLK source A
C
* internal
external
LK3 SYSCLK2X source A
C
* internal
external
LK5 pipelined SSRAM A
C
* pipelined
non-pipelined
LK12 PC card B VCC3EN A
C
* high
low
LK13 PC card A VCC3EN A
C
*high
low
LK14 AREQ1 select A
C
*
A_REQ001
low
LK15 AREQ2 select A
C*
A_REQ002
low
Table D-1: Surface mount links
hrg.book Page 2 Wednesday, July 22, 1998 9:18 AM
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