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Appendix A – Configuration Straps
5-4 AT91EB42 Evaluation Board User Guide
Note: 1. Hardwired default position: To cancel this default configuration, cut the wire on the
board.
5.2 Power
Consumption
Measurement
Strap (JP5)
The JP5 strap enables connection of an ammeter to measure the AT91M42800 global
consumption (V
DDCORE
and V
DDIO
) when V
DDCORE
power supply is derived from V
DDIO
(JP8 in 3V3 position). Core consumption can be measured by connecting another
ammeter between JP8 1-2 or 2-3, depending on the power supply used to power the
core.
The current measured on E11 is the total current required by the AT91M63200 on both
V
DDIO
and V
DDPLL
. It is also the current consumed by the switching regulator VR1 that
provides the 1.8V.
5.3 Ground Links
(JP6)
The JP6 strap allows the user to connect the electrical and mechanical grounds.
5.4 Increasing
Memory Size
The AT91EB42 Evaluation Board is supplied with two 128K x 8 byte SRAM memories.
If, however, the user needs more than 256K bytes of memory, the devices can be
replaced with two 512K x 8 3.3V 10/15 ns SRAMs, giving in total 1024K bytes.
JP1 User or Standard Boot Selection
2-3 The first half part of the Flash memory is accessible at its base address.
1-2 The second half part of the Flash memory is accessible at its base address.
This authorizes users to download their own application software in this part
and to boot on it.
JP2 Push Button Enabling
Open SW1-4 inputs to the AT91 are valid.
Closed SW1-4 inputs to the AT91 are not valid. This authorizes users to connect the
corresponding PIO to their own resources via the I/O expansion connector.
JP3 User or Standard Boot Selection
Open The RS-232 transceivers are enabled.
Closed The RS-232 transceivers are disabled. This authorizes users to connect the
corresponding PIO to their own resources via the I/O expansion connector.
JP8 Core Power Supply Selection
2-3 The AT91 core is powered by 3.3V power supply.
1-2 The AT91 core is powered by 1.8V power supply. In this case, the maximum
frequency that can be used is 17 MHz.