SAMA5D3 Xplained [USER GUIDE]
Atmel-11269D-ATARM-SAMA5D3-Xplained-XPLD-User Guide_07-Sep-15
10
4.2.1
Processor
The SAMA5D3 Xplained board is built around the SAMA5D36, a Cortex-A5 application processor which combines
high-performance computing device with low-power consumption and a wide range of communication peripherals.
It features a combination of user interface functionalities and high data rate IOs, including LCD controller,
touchscreen, camera interface, Gigabit and 10/100 Ethernet ports, high-speed USB and SDIO.
The ARM Cortex-A5 supports the latest generation of DDR2 and NAND Flash memory interfaces for program and
data storage. An internal 166-MHz multi-layer bus architecture associated with 24 DMA channels and two 64-
Kbyte SRAM blocks, sustains the high bandwidth required by the processor and the high-speed peripherals.
4.2.2
Clock Circuitry
The SAMA5D3 Xplained evaluation board features four clock sources:
Two clocks are alternatives for the SAMA5D3 series processor main clock
Two crystal oscillators are used for the GETH and Ethernet MII/RMII chip
4.2.3
Power Supplies
The on-board power supply generation is based on the Active-Semi
®
Power Management Unit (PMU) featuring a
3-channel (3.3V / 1.8V /1.2V or 1.0V) topology. For maximum efficiency, these supply channels are generated by
three integrated step-down converters.
In addition to these 3 DCDC channels, 4 LDO channels with low noise and high PSRR performance are available
for the application. These channels are disabled at startup by default and can be turned on and adjusted under
software control through an I²C link. They are also used to supply the 2.5V VDDFUSE and the 3.3V VDDANA
power inputs of the processor.
The power supply sequencing of the three primary channels is controlled by the PMU itself in full compliance with
the SAMAD3 requirements. The turn-on sequence is: 3.3V first, then 1.8V and finally 1.2V.
Table 4-2.
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 RGMII, 25 MHz
Y3
1
Oscillator for ethernet clock RMII, 25 MHz
Y4
WARNING
There is a known error on the ACT8865 I²C implementation. The port must be shut
off after configuration or problems may occur with devices using the same I²C
channel, e.g., TM43xx LCD display.
Refer to the ACT8865 datasheet at
http://www.active-semi.com/
for more details.
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