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Appendix A – Configuration Straps
Table 5-1. Functional Pin Assignment (Continued)
Pin Designation
PB17/TIOB3
PA13/MOSIA
PA12/MISOA
PA11/SPCKA
PA14/NPCSA0/NSSA
PA15/NPCSA1
PA16/NPCSA2
PA3/IRQ3
Function Used on the AT91EB42
General I/O input/output line to generate SDA signal dedicated for a
two wire bus access
To generate SPI bus Access to the DataFlash, EEPROM and ADC
devices
To generate SPI bus Access to the DataFlash, EEPROM and ADC
devices
To generate SPI bus Access to the DataFlash, EEPROM and ADC
devices
Chip Select signal for the SPI device: DataFlash
Chip Select signal for the SPI device: EEPROM
Chip Select signal for the SPI device: ADC
Interrupt line from the ADC device
5.2
Configuration
Straps (CB1 - 23,
JP1 - 8)
By adding the I/O and EBI expansion connectors, users can connect their own peripher-
als to the evaluation board. These peripherals may require more I/O lines than available
while the board is in its default state. Extra I/O lines can be made available by disabling
some of the on-board peripherals or features. This is done using the configuration straps
detailed below. Some of these straps present a default wire (notified by the default men-
tion) that must be cut before soldering the strap.
CB1
On-board PB5/A23/CS4 Signal
Closed
Open
(1)
AT91 PB5/A23/CS4 signal is connected to the EBI expansion connector
(P1-B21).
AT91 PB5/A23/CS4 signal is not connected to the EBI expansion connector
(P1-B21).
This authorizes users to connect the EBI expansion connector of this board
to the MPI expansion connector of an AT91EB63 Evaluation Board without
conflicting problems.
Note:
CB3
1. Hardwired default position: To cancel this default configuration, the user should cut
the wire on the board.
On-board IRQ3 Signal
Closed
Open
(1)
AT91 IRQ3 signal is connected to the external ADC (U20 pin 4).
AT91 IRQ3 signal is not connected to the external ADC (U20 pin 4). This
authorizes the user to use this signal for other applications via the I/O
Expansion connector (P2 - A8).
5-2
1708C–ATARM–12-May-05
Note:
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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