Atmel Evaluation Kit AT91SAM9X25-EK AT91SAM9X25-EK 数据表
产品代码
AT91SAM9X25-EK
Evaluation Kit Hardware
Evaluation Kit (EK) User Guide
4-5
11115A–ATARM–27-Jul-11
4.2.3
Function Blocks
4.2.3.1
Processor
The CM Board is equipped with an Atmel ARM-based embedded MPU, as listed below, in a 217-ball
BGA package. The five devices share an identical footprint. All five share the same CM Board PCB with
minor configuration differences.
BGA package. The five devices share an identical footprint. All five share the same CM Board PCB with
minor configuration differences.
The five devices are:
SAM9G15
SAM9G25
SAM9G35
SAM9X25
SAM9X35
As different interfaces can be defined using the same pins, it depends on the actual configuration of the
CPU as to which functions are in fact available to the EK board.
CPU as to which functions are in fact available to the EK board.
for details. The processor runs at a nominal frequency of
400 MHz for the core and 133 MHz for the system bus.
The peripheral configuration possibilities and implementation requirements of the CM are dependent on
the module's chipset. Two configuration resistors are implemented on board in order to select the mode
of configuration.
the module's chipset. Two configuration resistors are implemented on board in order to select the mode
of configuration.
4.2.3.2
Clock Circuitry
The CM includes 3 clock sources:
Two are alternatives for the processor main clock
One crystal and one crystal oscillator are used for the Ethernet MII/RMII chip
4.2.3.3
Reset Circuitry
The reset sources for the CM board are:
Power on reset
Push button reset (Push button is equipped on EK board)
JTAG reset from an in-circuit emulator (JTAG interface is equipped on EK board)
Table 4-3. Main Components Associated with the Clock Systems
Quantity
Description
Component assignment
1
Crystal for Internal Clock, 12 MHz
Y1
1
Crystal for RTC Clock, 32.768 kHz
Y2
1
Oscillator for Ethernet Clock RMII, 50 MHz
Y3