Atmel AT91EB42 manual Consumption, Measurement, Strap JP5, JP6 Increasing Memory Size

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Appendix A – Configuration Straps

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.

 

 

 

 

Note: 1. Hardwired default position: To cancel this default configuration, cut the wire on the

 

 

board.

 

 

 

5.2

Power

The JP5 strap enables connection of an ammeter to measure the AT91M42800 global

 

Consumption

consumption (VDDCORE and VDDIO) when VDDCORE power supply is derived from VDDIO

 

Measurement

(JP8 in 3V3 position). Core consumption can be measured by connecting another

 

Strap (JP5)

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

VDDIO and VDDPLL. It is also the current consumed by the switching regulator VR1 that provides the 1.8V.

5.3Ground Links The JP6 strap allows the user to connect the electrical and mechanical grounds.

(JP6)

5.4Increasing 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.

5-4

AT91EB42 Evaluation Board User Guide

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Contents AT91EB42 Evaluation Board User Guide Page Table of Contents Appendix a Configuration Straps Table of ContentsDeliverables Section OverviewScope Evaluation Board Two serial portsOverview ASBSection Setting Up the AT91EB42 Evaluation Board Electrostatic WarningLayout Measuring TestingBoard CurrentSection On-board Software AT91EB42 Evaluation BoardProgram Downloader Programmed Default Memory MappingDefault Speed On-board SoftwareProcessor ConnectorsSection Circuit Description ExpansionConverter PowerMemories Crystal QuartzCircuit Description Circuit Description Section Appendix a Configuration Straps Configuration Straps CB1 23, JP1Appendix a Configuration Straps CB15 Serial DataFlash Enabling CB18 PB20 ADC Write Access SignalCB19 PB18 End of Fast Charge Signal CB17 SPI Eeprom EnablingStrap JP5 ConsumptionMeasurement JP6 Increasing Memory SizeSection Appendix B Schematics SchematicsAppendix B Schematics PCB LayoutAT91EB42 Evaluation Board User Guide EBI MemoriesEBI Memories Schematics AppendixI/O and EBI Expansion Connectors Serial Interface ValbpAT91M42800 Reset and Jtag Schematics Interface ICEVDDCORE=1.8V Saft VRE 1/2 AA AT91EB42 Evaluation Board User Atmel Headquarters Atmel Operations
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