AT91EB40 Atmel, AT91EB40 Datasheet - Page 17

• 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

5.1
5.2
AT91EB40 Evaluation Board User Guide
Jumpers (LK2)
Surface Mount
Links
(LK1, LK3 - 9)
The LK2 jumper is used to select the clock frequency. The frequency options are
32,768 MHz, 32.768 MHz divided by 2, 4 or 8, or an external clock applied via the
expansion bus interface.
Note that before using this function, the user must fit the 4-bit binary counter used to
divide the 32.768 MHz clock.
By adding the I/O expansion and the bus expansion connectors, the user can add his
own peripherals 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 avail-
able by disabling some of the on-board peripherals. This is done using the surface
mount links detailed below. If these links need to be changed, a fine-tipped soldering
iron is required. All links are 0R 0805 resistors unless stated otherwise.
LK1 should be left unaltered unless a memory upgrade is required. If this is the case,
see the paragraph “Increasing Memory Size” on page 5-2.
Note:
LK1
A-C
B-C
LK3
A-C
B-C
EBI
Appendix A – Configuration Links
1
2
Use a 10K resistor.
Function
A18 is used as the chip select for SRAM Bank 1. Should be in this position
for 128K x 8 SRAMs
A20 is used as the chip select for SRAM Bank 1. Should be in this position
for 512K x 8 SRAMs
Function
Alternate boot mode NOT selected
Alternate boot mode selected
MAST
3
4
LK2
/2
5
6
and SRAM Bank 1
/4
7
8
Section 5
10
/8
9
5-1