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Appendix A – Configuration Straps
CB9
Closed (1)
Open
On-board Boot Chip Select
AT91 NCS0 select signal is connected to the Flash memory.
AT91 NCS0 select signal is not connected to the Flash memory. This
authorizes the user to connect the corresponding select signal to their own
resources via the EBI expansion connector.
Note:
CB10
1. Hardwired default position: To cancel this default configuration, the user should cut
the wire on the board.
Flash Reset
Closed
(1)
The on-board reset signal is connected to the Flash NRESET input.
Open
Note:
CB12
Open (1)
Closed
Note:
The on-board reset signal is not connected to the Flash NRESET input.
1. Hardwired default position: To cancel this default configuration, the user should cut
the wire on the board.
Boot Mode Strap Configuration
BMS AT91 input pin is set for the microcontroller to boot on an external 16-bit
memory at reset.
BMS AT91 input pin is set for the microcontroller to boot on an external 8-bit
memory at reset.
1. Hardwired default position: To cancel this default configuration, the user should cut
the wire on the board.
CB13, CB14
Two-wire Interface EEPROM Enabling
Closed
Open
(1)
EEPROM communication enabled.
EEPROM communication disabled. This authorizes users to connect the
corresponding PIO to their own resources via the I/O expansion connector.
Note:
1. Hardwired default position: To cancel this default configuration, the user should cut
the wire on the board.
CB15
Closed (1)
Open
Serial DataFlash Enabling
AT91 NPCSA0 select signal is connected to the serial DataFlash memory.
AT91 NPCSA0 select signal is not connected to the serial DataFlash
memory. This authorizes users to connect the corresponding PIO to their
own resources via the I/O expansion connector.
Note:
CB16
Closed
1. Hardwired default position: To cancel this default configuration, the user should cut
the wire on the board.
Control Line for the Internal Oscillator
Disables the internal low frequency oscillator.
5-4
1708C–ATARM–12-May-05
Open
Note:
(1)
Enables the internal oscillator.
1. Hardwired default position: To cancel this default configuration, the user should cut
the wire on the board.
AT91EB42 Evaluation Board User Guide
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