Ideas for daughter cards?

Sub forum for Parallella daughter cards and accessories

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Re: Ideas for daughter cards?

Postby shodruk » Mon Mar 31, 2014 3:16 pm

Mark,
Yes, samtec connectors are very expensive. :cry:
But I think we can use BSH-120 instead of 4x BSH-030 to save some money.

BSH-120 $9.66
http://www.digikey.com/product-detail/e ... ND/1975817
BTH-120 $9.86
http://www.digikey.com/product-detail/e ... ND/1975824
--------------
$19.52 per add-on board

BSH-030 $5.89
http://www.digikey.com/product-detail/e ... ND/2619990
BTH-030 $6.00(maybe)
x4
--------------
$47.56 per add-on board


Andrew,
Thanks! The third eLink would be very useful.


Tim,
Yes, we can add the Epiphany on Parallella to the eLink network, but I thought that implementing eLink router on FPGA can be a nightmare, so I thought it's better to let it isolate.


Andreas,
Great! I expect that doubles something...
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Re: Ideas for daughter cards?

Postby shodruk » Tue Apr 08, 2014 4:53 pm

Epiphany SO-DIMM module inspired by RPi compute module

epidimm.png
epidimm.png (44.31 KiB) Viewed 13565 times
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Re: Ideas for daughter cards?

Postby aolofsson » Tue Apr 08, 2014 5:39 pm

Nice :D

Using the SODIMM concept is well known and there are quite a few boards out there already with this form factor. Here's one from Switzerland that uses the Zynq:

http://www.enclustra.com/en/products/fp ... /mars-ax3/

Not sure if this is our highest priority, but the Parallella is open source so if there is a market for this type of SODIMM I am sure somebody will build one. :D

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Re: Ideas for daughter cards?

Postby ralsalamanca » Tue Apr 08, 2014 6:21 pm

A HDMI input :D
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Re: Ideas for daughter cards?

Postby parapara » Thu May 01, 2014 8:48 pm

shodruk wrote:Mark,
Yes, samtec connectors are very expensive. :cry:
But I think we can use BSH-120 instead of 4x BSH-030 to save some money.

BSH-120 $9.66 http://www.digikey.com/product-detail/e ... ND/1975817
BTH-120 $9.86 http://www.digikey.com/product-detail/e ... ND/1975824
1x -------------- $19.52 per add-on board

BSH-030 $5.89 http://www.digikey.com/product-detail/e ... ND/2619990
BTH-030 $6.00(maybe)
x4 -------------- $47.56 per add-on board

So, I can get more of the parallella-side connectors easily? good to know
Could anyone explain to me what sense it makes to sell only one end of matching connector pair?
Are all other parallella-like designs using the connector pair the other way around, so noone needed the BTH piece?
On the other hand - no way I'll ever use the eLinks with my budget, which makes it $9.86 v.s. $12.00 (maybe).
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Re: Ideas for daughter cards?

Postby parapara » Thu May 01, 2014 8:52 pm

on the rev0 pages you said that the overheating is caused by a linear 1.8V regulator
+ unecessarily high IO voltage for the epiphany.

Would it work to create an addon board with a better regulator? (that would solve the 1.8V power amplification)
Is there something that prevents such rev0-fix daughterboard from shutting that regulator down and providing 1.8V instead?
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Re: Ideas for daughter cards?

Postby parapara » Thu May 01, 2014 8:56 pm

+1 for the additional ethernet expansion.

I do have a question about that, though.
Earlier it was said that the 2nd GLan controller is unavailable.
By the Zynq docs, even though there aren't enough PS pins for some of the peripherals
it should still be possible to access remaining features from the FPGA side and route them to fpga pins instead.
Sounds bulletproof to me.
What did I miss?
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Re: Ideas for daughter cards?

Postby aolofsson » Thu May 01, 2014 10:10 pm

Yes, we can route the ethernet port through the programmable logic to the GPIO expansion connector...but someone still needs to build an expansion board with a PHY and rj45.
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Re: Ideas for daughter cards?

Postby 9600 » Fri May 02, 2014 7:40 am

aolofsson wrote:Yes, we can route the ethernet port through the programmable logic to the GPIO expansion connector...but someone still needs to build an expansion board with a PHY and rj45.


Oh, I have one of those little PHY + jack prototyping boards I got for using with a DE0-Nano and OpenRISC. How much work to modify the RTL? It'd be fun to hook the PHY up via a Samtec breakout.

Cheers,

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Re: Ideas for daughter cards?

Postby parapara » Sun May 04, 2014 8:34 am

I wonder why do you ask only about the PL part.
Is the required modification of the PS side / device tree obvious?

I'm glad you like the idea.
What do you think about providing/shipping the required changes by default?
(OR, if the power consumption impact turns out to be noticeable, prepared and commented out?)
Availability of the second (R?)GMII could be a good incentive for overcoming the Samtec-sourcing hurdle.

Remark from the table "MIO Peripheral Interface Mapping" - row "GigE: 0,1"
While for regular PS pins "MIO" it mandates RGMII v2.0, External PHY
For PL "EMIO" it seems to offer way more options:
. . . GMII, RGMII v2.0 (HSTL), RGMII v1.3, MII, SGMII,
. . . and 1000BASE-X in Programmable Logic
However, the figure directly after the table lits only "GMII" for the EMIO interconnection.
I assume that just implies that one can implement a PHY or other xGMII-s in PL if she desires to?
Given the already existing trouble with heat, a dedicated PHY seems like a good idea anyway.

I'd definitely like to hear back about the required changes,
but it seems a bit off topic here. Is a good idea to create a separate topic?
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