README.md
Allwinner A13 Board



Description

Board overview (draft):
[TBD]

Features




  
Characteristic
  
Description




  
Dimensions
  
80mm x 40mm


  
Processor
  
Allwinner A13 (ARM Cortex-A8 @ 1Ghz)


  
Oscillators
  
24MHz main clock


  
RAM
  
DDR3 512MB max (8Gbit module)


  
Storage
  
microSD


  
USB
  
1 microUSB OTG


  
Ethernet
  
N/A


  
WiFi/BT
  
RTL8188CUS module


  
LCD
  
Parallel interface 18bit


  
Expansions
  
1xUART, 1xI2C, 1xSPI, 4xGPIO, Microphone, EarphoneOut


  
Supply
  
Power path between USB/ACIN/Battery, 5V max




Expansions

The board can be combined with several predefined capes that add functionality.
 * <![CDATA[]]>LCD cape<![CDATA[]]> can be used to add a 3inch LCD/Touch with 800x480px resolution.
 * <![CDATA[]]>GPS cape<![CDATA[]]> adds GPS/GNSS/GLONAS capabilities
 * <![CDATA[]]>GSM cape<![CDATA[]]> adds GPRS connectivity.

Power considerations

A13 features a few power rails:
* VDD-CPU - TBD - from AXP209
* VDD-INT - 1.2V - from DCDC
* VDD-GPIO - 3V3 - from AXP209
* VDD-DRAM - 1V5 - from DCDC
* AVCC - 3V - from AXP209

The datasheet states that AVCC and VDD-DRAM must be present at all times (even standby).
VDD-INT and VDD-CPU can't be tied together because VDD-CPU is DVS enabled.

Memory considerations

A13 DRAM controller doesn't provide DDR-CS. On the memory side the pin is tied to GND.
Memory tuning should be performed as <![CDATA[]]>described here<![CDATA[]]>

Building and flashing

Build U-Boot and Linux kernel + rootFS - TBD

Flash to SDCard - TBD

Resources

You can find all necesary information to build or evaluate the module here:
   - <![CDATA[]]>Fabrication files<![CDATA[]]>

Inspiration for this has been drawn from:
* Olimex boards 
* Sunxi community