sbc_allwinner_a13
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Open hardware compute module with Allwinner A13 (ARM-A8 @1GHz), DDR3 (max 512MB) and expansions (USB, GPIO, WiFi, LCD, Audio)
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.
- LCD cape can be used to add a 3inch LCD/Touch with 800x480px resolution.
- GPS cape adds GPS/GNSS/GLONAS capabilities
- GSM cape 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 described here
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:
Inspiration for this has been drawn from:
- Olimex boards
- Sunxi community
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