Home‎ > ‎

Bifferboard with 2 USB ports


The board arrangement (CPU+IO) is much the same, just a little larger to allow space for the extra connectors on the IO board.  The board interconnects are 0.05 inch pitch, which unfortunately means the two boards are not so stable in relation to one another, and therefore it's recommended that the arrangement be supported by the supplied case (included in the price).

Be careful when closing the case; the hooks from the cover snap very tight into the four slots of the bottom case. Opening the case can break these hooks.


  • 100% Software-compatible with the original Bifferboard, protects your time investment
  • RDC3210 CPU, 32MB DRAM, 8MB Flash
  • 83mm x 48mm x 19mm (44g).
  • Biffboot bootloader (same interface as before, same upload scripts etc...)
  • Can be powered from Bifferboard PSU (identical power jack)
  • 2 USB ports (the RDC3210 does natively support 2 ports, on the standard bifferboard 1 port is not connected)
  • MMC/SD/SDHC/MemoryStick card reader available to the host OS as a USB mass storage device - Note: with a card inserted, the USB port nearest the card-reader is disabled, this is done by a pericom PI3USB10 channel multiplexer. To support the card reader a genesys logic GL827 chip is used.
  • Comes with pre-soldered serial and JTAG header pins - shorter than normal (which may cause problems for some connectors), but can be lengthened
  • 45 uk pounds with case included, available to buy 11th 18th Jan 2010.

Power requirements

Current consumption without SD card or USB devices connected is approx 250mA@5v.  Note that although the 1-port Bifferboard PSU can power this device it only supplies 1.2A so there will be insufficient power for two connected USB devices consuming 0.5A each.  It is therefore expected that only one of the USB devices will need the full 0.5 amps.

CPU board


 Pin  Description  Comments
 1  GND  
 2  N/C  
 3  Serial in
 4  Serial out
 5  3.3v  


 Pin  Description  Comments
 1  3.3v  3.3v
 2  TMS  GPIO11
 3  TDI  GPIO13
 4  TDO  GPIO9
 5  TCK  GPIO12
 6  GND  GND

To convert the JTAG pins to be used as GPIO see this and this.


 Diode  Function  Colour
 D1  Ethernet  GREEN
 D2  Power  BLUE

IO Board


 'reset' button
 through-hole LED  SD/MS card inserted