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anyone using Parallela ? 16-core Epiphany RISC SOC + Zynq SOC (FPGA + ARM A9)
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Topic: anyone using Parallela ? 16-core Epiphany RISC SOC + Zynq SOC (FPGA + ARM A9) (Read 2904 times)
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legacy
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anyone using Parallela ? 16-core Epiphany RISC SOC + Zynq SOC (FPGA + ARM A9)
«
on:
December 06, 2016, 04:40:39 pm »
is anyone using the
Parallella
board ? ( 99 USD )
if so, for which project
?
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helius
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Re: anyone using Parallela ? 16-core Epiphany RISC SOC + Zynq SOC (FPGA + ARM A9)
«
Reply #1 on:
December 06, 2016, 05:08:19 pm »
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.
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legacy
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Re: anyone using Parallela ? 16-core Epiphany RISC SOC + Zynq SOC (FPGA + ARM A9)
«
Reply #2 on:
December 06, 2016, 07:57:23 pm »
Quote from: helius on December 06, 2016, 05:08:19 pm
Be aware that there is a design error on the board
has been fixed in the last releases ?
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thm_w
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Re: anyone using Parallela ? 16-core Epiphany RISC SOC + Zynq SOC (FPGA + ARM A9)
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Reply #3 on:
December 06, 2016, 08:32:04 pm »
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
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bktemp
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Re: anyone using Parallela ? 16-core Epiphany RISC SOC + Zynq SOC (FPGA + ARM A9)
«
Reply #4 on:
December 06, 2016, 08:42:09 pm »
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.
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ebclr
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Re: anyone using Parallela ? 16-core Epiphany RISC SOC + Zynq SOC (FPGA + ARM A9)
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Reply #5 on:
December 09, 2016, 06:32:33 am »
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
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legacy
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Re: anyone using Parallela ? 16-core Epiphany RISC SOC + Zynq SOC (FPGA + ARM A9)
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Reply #6 on:
December 09, 2016, 03:52:35 pm »
ummm, I'd like to port my SoftCore on the FPGA, too
but I'd also like to play with the Epiphany SoC
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