AT91EB40 Atmel, AT91EB40 Datasheet - Page 18

• Manufacturer Part Number: AT91EB40
• Description: AT91 ARM X40 SERIES EVAL KIT
• Manufacturer: Atmel

Specifications of AT91EB40

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Appendix A – Configuration Links and SRAM Bank 1
5.3
5-2
Increasing
Memory Size
Note:
The AT91EB40 is supplied with four 128K x 8 byte SRAM memories. If, however, the
user needs more than 512K bytes of memory, the devices can be replaced with four
512K x 8 3.3V 15/20 ns SRAMs giving, in total, 2048K bytes. If this is done, LK1 must be
moved to position B-C.
The user must either have 128K x 8 SRAMs or 512K x 8 SRAMs fitted in Bank 0 and, if
desired, Bank 1. The two SRAM sizes cannot be mixed.
LK4
A-C
B-C
LK5
A-C
B-C
LK6
A-C
B-C
LK7
A-C
B-C
LK8
A-C
B-C
LK9
A-C
B-C
Use a 10K resistor.
Function
RXD lines are set tri-state on the RS-232 transceiver so that the receiver
signals to AT91 can be used for external I/O via the I/O connector.
Receive pins on AT91 used by on-board serial ports
Function
TXD0 connects to I/O connector
TXD0 connects to RS-232 Transceiver
Function
AT91 IRQ0 pin connects to I/O connector
AT91 IRQ0 input is from IRQ switch
Function
AT91 FIQ pin connects to I/O connector
AT91 FIQ input is from FIQ switch
Function
TXD1 connects to I/O connector
TXD1 connects to RS-232 Transceiver
Function
TIOB1 connects to I/O connector
AT91 TIOB1 input is from TIOB1 switch
AT91EB40 Evaluation Board User Guide