Parallella 7010 no GPIO - no Samtec Connectors

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Parallella 7010 no GPIO - no Samtec Connectors

Postby greytery » Wed Jun 11, 2014 2:23 pm

Been waiting 9 months for these babies - and my twin "No GPIO / Zynq7010" boards have finally arrived. Not yet given the traditional sharp smack on the bottom to power them into life.

But I was astonished when turning them over to find : NO Samtec Connectors at all!

7010-bottom.png
7010-bottom.png (985.1 KiB) Viewed 9095 times

OK, so I get the phrase "no GPIO" but why does that mean no PEC's at all? No North and South? No Power PEC? I cant see this mentioned in the manual, or anywhere.
The shop website still gives the following information for the 7010:

E16-7010 spec.PNG
E16-7010 spec.PNG (16.23 KiB) Viewed 9095 times


Now, I had no immediate plans to attempt to use any of the expansion ports, and intend to power up and get playing. But others who have ended up with 7010's like this may be dissappointed.

An explanation, please.

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Re: Parallella 7010 no GPIO - no Samtec Connectors

Postby tnt » Wed Jun 11, 2014 2:28 pm

That kind of seemed obvious that there would be none of the connectors, what were you expecting ? Just remove the one for GPIO ? That wouldn't make that much of a difference. The interest of that config is to cut down price by removing the expensive connectors (but removing a single one wouldn't make _that_ much of a difference) and to cut down the height of the board a bit (which again would make no sense if the other 3 connectors were there).
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Re: Parallella 7010 no GPIO - no Samtec Connectors

Postby greytery » Wed Jun 11, 2014 2:52 pm

tnt,

The only obvious thing is not having the GPIO connector: 7010 has fewer pins available for GPIO so there's some logic in not fixing that socket which wouldn't be connected anyway. OK, I'll let you have the point that it would not save a lot of money to leave just three samtec's. When ordering I was not given a 'cheaper' option: $99 each.

But a wobbly parallella because it's only got three legs?? My, how I chuckled at the thought :D .

The remaining 7010 logic still supports the pins on the Power PEC. The Power PEC also provides useful features such as setting the coordinates of the board. North/South PECs are driven by the Epiphany (aren't they?).

Nowhere does it say that the 7010 boards are NEVER going to be useful in a cluster (connected via eLink that is).

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Re: Parallella 7010 no GPIO - no Samtec Connectors

Postby tnt » Wed Jun 11, 2014 3:30 pm

The 7010 has less GPIO on the FPGA, not none. Half the GPIOs would be active if the GPIO samtec was fitted.

The parallella reference manual in the section "build options" also talks about "samtec expansions connectors" (plural) and not about PEC-GPIO specifically.
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Re: Parallella 7010 no GPIO - no Samtec Connectors

Postby aolofsson » Wed Jun 11, 2014 4:05 pm

tery,

You have been very supportive for a long time and I hate for you to be disappointed! When there is a misunderstanding like this, I do think that most of the blame goes to the communicator (" adapteva") (not the communicatee). We thought we made it "clear enough", but obviously we should have been more explicit in the writing.

This is really helpful feedback. We are getting really close to opening up the shop again and we will make sure we edit the description to avoid misunderstandings going forward!

Sincerely,
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Re: Parallella 7010 no GPIO - no Samtec Connectors

Postby greytery » Wed Jun 11, 2014 4:09 pm

tnt wrote:The 7010 has less GPIO on the FPGA, not none. Half the GPIOs would be active if the GPIO samtec was fitted.


Which raises a serious question: if there are no sockets, shouldn't there be a FPGA build to block off all those IO pins?
Should the 7010 HDMI/headless FPGA build take that into account?

tnt wrote:The parallella reference manual in the section "build options" also talks about "samtec expansions connectors" (plural) and not about PEC-GPIO specifically.


Thanks for the pointer to page 46 of the manual, quote ..

parallella manual wrote:The following Parallella assembly options will be supported in manufacturing:
• Zynq Device: Z-7010 or Z-7020
• Epiphany Device: E16G301 or E64G401
• IO: With our without Samtec expansion connectors
• Ethernet: With or without Ethernet (RJ45 and Ethernet Phy)


OK I see the 's'.
Who on earth reads the manual when buying something on-line, eh?

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Re: Parallella 7010 no GPIO - no Samtec Connectors

Postby tnt » Wed Jun 11, 2014 4:47 pm

greytery wrote:Which raises a serious question: if there are no sockets, shouldn't there be a FPGA build to block off all those IO pins?
Should the 7010 HDMI/headless FPGA build take that into account?


Why would have a socket fitted or not make any difference ?

Ideally the GPIO will either be disabled if not configured in the bitstream, or for the bitstream with the GPIO EMIO block enabled will be configured as input by default (and preferrably enable the internal weak pullups to avoid oscillations). But this is valid for all boards. The default state should be safe.


greytery wrote:Who on earth reads the manual when buying something on-line, eh?


From your original message :

I cant see this mentioned in the manual, or anywhere.


I'm just pointing out that this is not quite true.

I can't speak for the shop description because I can't see it ATM and the one that's there at the moment and that you quoted above is for the "7010 with GPIO connectors".
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Re: Parallella 7010 no GPIO - no Samtec Connectors

Postby greytery » Wed Jun 11, 2014 5:18 pm

aolofsson wrote:.. I hate for you to be disappointed!


Actually I'm not dissapointed at all ( - OK so I haven't switched them on yet - ), my word was 'astonished'.
I'm 99.999% certain that I will never need those connectors; my plans don't involve mega-clusters or even mega-GPIO.
Just to head off others that may have had other plans.

I'm {edit: as happy as} a pig in muck, as me old Dad used to say.

tnt wrote:The default state should be safe.

I hope so - not a electronics guy. Even my soldering is more like welding.

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Last edited by greytery on Wed Jun 18, 2014 9:13 am, edited 1 time in total.
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Re: Parallella 7010 no GPIO - no Samtec Connectors

Postby FHuettig » Wed Jun 11, 2014 6:34 pm

tnt wrote:
greytery wrote:Which raises a serious question: if there are no sockets, shouldn't there be a FPGA build to block off all those IO pins?
Should the 7010 HDMI/headless FPGA build take that into account?


Why would have a socket fitted or not make any difference ?

Ideally the GPIO will either be disabled if not configured in the bitstream, or for the bitstream with the GPIO EMIO block enabled will be configured as input by default (and preferrably enable the internal weak pullups to avoid oscillations). But this is valid for all boards. The default state should be safe.


There is no difference electrically between a board with no GPIO connector and one with a connector that is not connected to anything, so the same bitstream can be used for both. The default state for the GPIO EMIOs is as inputs, but it's a good idea to have them pulled-up by default. I'll add that to the logic, thanks for pointing it out.
-- Fred -- Hardware Guy --
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Re: Parallella 7010 no GPIO - no Samtec Connectors

Postby tnt » Wed Jun 11, 2014 6:55 pm

I'm wondering if pulldowns are better actually (does the fpga support that).
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