Author Topic: anyone using Parallela ? 16-core Epiphany RISC SOC + Zynq SOC (FPGA + ARM A9)  (Read 1637 times)

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Offline legacy

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is anyone using the Parallella board ? ( 99 USD )
if so, for which project :D ?
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Offline helius

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Be aware that there is a design error on the board; the designers failed to correctly consider inrush currents (as taught in Linear Technology's AN88) and as a result they are easily damaged.
 

Offline blueskull

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If I am to find a platform with highest GFLOPS per buck, I would use a consumer chip with OpenCL support, such as LattePanda.
The unified memory structure makes memory addressing between coprocessor and CPU not that hard to do anymore.
 

Offline legacy

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Be aware that there is a design error on the board

has been fixed in the last releases ?
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Offline thm_w

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The psu chip used has a max Vin of 6.5V:
http://www.intersil.com/content/dam/Intersil/documents/isl9/isl9305h.pdf
http://www.intersil.com/content/dam/Intersil/documents/isl9/isl9307.pdf

AN88 posted lists an example of over 2x voltage being applied. So this chip could presumably get over 10V.
Schematic is listed as Rev 1 still. So it seems like it was not fixed?

Would be possible to add a TVS across C237: http://www.parallella.org/docs/parallella_schematic.pdf
 

Offline bktemp

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Adding a TVS could work, but the transition of most TVS diodes is too soft for such a small voltage difference (5V->6.5V). The inrush current can easily >10A and the TVS must be able to limit the voltage at this current.
But there is a much easier solution: Just add an electrolytic capacitor of about 10x the value of the ceramic capacitor. Its ESR will dampen any overshoots.
 

Offline ebclr

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I bought basically to play with the Zynq SOC, it's the cheapest , and util now no problem, it's used only to research on FPGA
 

Offline legacy

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ummm, I'd like to port my SoftCore on the FPGA, too
but I'd also like to play with the Epiphany SoC  :D
the Bunker is open, at DTB!
Do not buy any shit from China!
Buy serious Chinese products!!!
 


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