Atmel AT91EB40A, User Manual

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AT91EB40A Evaluation Board User Guide 5-3
2635C–ATARM–13-May-05
Notes: 1. Hardwired default position: To cancel this default configuration, the user should first
cut the wire on the board.
2. Regarding CB2 setting: The EB40A also supports an AT91M40800 or an
AT91R40807. However, if the user wants to evaluate these devices, the microcontrol-
ler U7 and the oscillator Y1 must be changed. If an AT91M40800 is mounted on the
board, external SRAM must be added to increase SRAM quantity since the
AT91M40800 embeds 8K bytes only.
To upgrade the EB40A to support an AT91M40800 or an AT91R40807:
1. De-solder the microcontroller U7.
2. Solder the AT91M40800 or the AT91R40807 to the U7 footprint.
3. De-solder the crystal oscillator Y1.
4. Solder a crystal oscillator (up to 40 MHz) to the Y1 footprint.
5. Set CB2 to 1 - 2 before supplying the board.
5.2 Power
Consumption
Measurement
Straps (JP5A/B,
JP7A/B)
The JP5A/B straps enable connection of an ammeter to measure the AT91R40008 glo-
bal consumption on VDDIO.
The JP7A/B straps enable connection of an ammeter to measure the AT91R40008 glo-
bal consumption on VDDCORE.
5.3 Ground Links
(JP6)
The CB10 strap allows the user to connect the electrical and mechanical grounds.
CB16 Highest Address Bit
Open
(1)
Setting to support an AT49BV1604 or AT49BV1614 (or an AT49BV161) on
U1A footprint or an AT49BV8011 (or an AT49BV400) on U1B footprint.
Closed Setting to support an AT49BV1604/A on U1A footprint.
JP1 User or Standard Boot Selection
2-3 The first half of the Flash memory is accessible at its base address.
1-2 The second half 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.