Klondike - 16 chip ASIC Open Source Board - Preliminary - page 172.

BkkCoins

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Quote from: sensei on May 06, 2013, 10:58:29 AM

Do we have enough room to have a 2-3mm keepout zone around the edge so that we can have the option of sliding the card into an edge guide rail instead of stacking?

On 2 sides only of course. In the format your board was presented, it would be the top and bottom.

I currently have about 6mm space along top and bottom because the corner holes are there.
The first metal exposed on the holes is at 2.8mm from edge.

Stacking/mounting hole centers from each corner are at 5mm, 5mm and dia. currently 3mm.
Holes centered between ASICs are at 18.5mm, 22.5mm same 3mm dia.
See diagram posted further up for layout.

You could probably use a VGA heat sink mounted under each quadrant of 4 ASICs. The total size covering 4 ASICs is 28mm x 25mm.

sensei

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Do we have enough room to have a 2-3mm keepout zone around the edge so that we can have the option of sliding the card into an edge guide rail instead of stacking?

On 2 sides only of course. In the format your board was presented, it would be the top and bottom.

Kuma

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I would order around 10 Klondike 64, but it really depends on price and ETA.

Bicknellski

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Could be off the rack / shelf alternative laying around in some warehouses in China. Might be worth a look. I have sent out a number of emails on this already. Have heard from one supplier... but would need to ask BKK on what holes required and what sort of mounting arrangement as well. Certainly a lot of people can provide a basic aluminum extruded 10 x 10 heat sink to specifications. That might be just about the easiest part to find I think.

I was also looking at vga after market heatsinks for gpu's with built in fans but again depends on what is possible for mounting and are fans really required?

sensei

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Quote from: fasmax on May 06, 2013, 06:45:10 AM

Ay ideas on heatsinks ?

We had a member, Knecke, who was looking into providing them.

fasmax

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Ay ideas on heatsinks ?

Ente

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Quote from: BkkCoins on May 06, 2013, 04:39:44 AM

Quote from: Ente on May 06, 2013, 04:09:42 AM

What happens when one ASIC dies? Gracefully, like just switching itself off, not burning and creating a crater.. ;-)
Will just this ASIC be missing, or all following in the "chain", or the whole board?
Would the 64 ASIC board be the same, all following or all 64 fail if one fails?

Seems like burnin's board is not fault tolerant against individual ASIC fails.

Ente

It's hard to say right now without docs. If they are daisy chained then one failed "may" prevent the others after it from working. I say may because it depends on the failure mode. It could just stop hashing correctly, or it could "blow" hard and prevent data from shifting through at all.

If they're not chained and have some kind of serial bus then likely one failing would not stop the others but would be a range of nonces that never gets hashed.

In both cases one board should not affect other boards and the 64 chip board would be identical to 4 separate 16 chips boards - as that's what it is.

Sounds good, thank you!

So, it's time for some open-sourcing on side of avalon! :-)

Ente

BkkCoins

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Quote from: Ente on May 06, 2013, 04:09:42 AM

What happens when one ASIC dies? Gracefully, like just switching itself off, not burning and creating a crater.. ;-)
Will just this ASIC be missing, or all following in the "chain", or the whole board?
Would the 64 ASIC board be the same, all following or all 64 fail if one fails?

Seems like burnin's board is not fault tolerant against individual ASIC fails.

Ente

It's hard to say right now without docs. If they are daisy chained then one failed "may" prevent the others after it from working. I say may because it depends on the failure mode. It could just stop hashing correctly, or it could "blow" hard and prevent data from shifting through at all.

If they're not chained and have some kind of serial bus then likely one failing would not stop the others but would be a range of nonces that never gets hashed.

In both cases one board should not affect other boards and the 64 chip board would be identical to 4 separate 16 chips boards - as that's what it is.

punin

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Quote from: BkkCoins on May 06, 2013, 02:22:56 AM

Quote from: punin on May 06, 2013, 02:16:24 AM

You might want to stich that ground plane.

Yes, I need to do that. Is there a best practices doc about ideal location and how many?
I was going to google it soon but haven't quite got there as I'm setting up the firmware project right now.

It depends, your PCB manufacturer can comment on that after you send first version of gerbers to them for a quote.

Ente

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What happens when one ASIC dies? Gracefully, like just switching itself off, not burning and creating a crater.. ;-)
Will just this ASIC be missing, or all following in the "chain", or the whole board?
Would the 64 ASIC board be the same, all following or all 64 fail if one fails?

Seems like burnin's board is not fault tolerant against individual ASIC fails.

Ente

Bicknellski

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So

8 20 x 20 please.
2 10 x 10 please.

I am looking at housing my farm collocated at a datacenter just to make it easier for myself and cheaper in the long run.

BkkCoins

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Quote from: punin on May 06, 2013, 02:16:24 AM

You might want to stich that ground plane.

Yes, I need to do that. Is there a best practices doc about ideal location and how many?
I was going to google it soon but haven't quite got there as I'm setting up the firmware project right now.

punin

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You might want to stich that ground plane.

turtle83

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Supersonic

Quote from: BkkCoins on May 06, 2013, 12:17:20 AM

Klondike 1 - thumb size

+1 . Horizontal scaling FTW

bassclef

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Quote from: BkkCoins on May 06, 2013, 12:17:20 AM

My tentative plans were to offer 6 products:
Board Only and Board w/Parts kit.

For each,

Klondike 1 - thumb size
Klondike 16 - 10x10cm
Klondike 64 - 20x20cm

I like this idea very much. I would likely order a number of each.

BkkCoins

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Quote from: daemondazz on May 06, 2013, 12:05:50 AM

Don't you need 4 layer?

Yes.

My tentative plans were to offer 6 products:
Board Only and Board w/Parts kit.

For each,

Klondike 1 - thumb size
Klondike 16 - 10x10cm
Klondike 64 - 20x20cm

Once I have a working prototype I'll start an "OpenBitcoinstore" site to take pre-orders. That way I know how big a PCB batch to run, and how many components. I'll have a bulk order rate for assemblers who want to source everything needed (but ASICs) the easy way.

I may offer an pre-assembled "Klondike 1" as well since I figure that's not beyond my means to build here. The rest I'm looking at shipping parts to my home in Canada, packing kits and shipping from both there and across the border in WA state (because Canada Post is too costly for x-border).

At least that's my thinking now unless I get talked into some better idea.

daemondazz

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Don't you need 4 layer?

BkkCoins

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Quote from: Enigma81 on May 05, 2013, 11:39:20 PM

Quote from: BkkCoins on May 04, 2013, 09:02:23 PM

Quote from: ecliptic on May 04, 2013, 08:39:45 PM

What do you mean spend 10$ for test boards? The setup cost is usually several hundred dollars.

I can order 10pcs, 5cm x 5cm boards for $10 plus shipping.

Gotta love
http://www.seeedstudio.com/depot/fusion-pcb-service-2-layers-p-835.html?cPath=185
and
http://imall.iteadstudio.com/open-pcb/pcb-prototyping/im120418001.html

I use them both fairly often..

Enigma

Oh darn you.

Now I have to hold back the cad files until I've earned something for my work.

Enigma81

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Quote from: BkkCoins on May 04, 2013, 09:02:23 PM

Quote from: ecliptic on May 04, 2013, 08:39:45 PM

What do you mean spend 10$ for test boards? The setup cost is usually several hundred dollars.

I can order 10pcs, 5cm x 5cm boards for $10 plus shipping.

Gotta love
http://www.seeedstudio.com/depot/fusion-pcb-service-2-layers-p-835.html?cPath=185
and
http://imall.iteadstudio.com/open-pcb/pcb-prototyping/im120418001.html

I use them both fairly often..

Enigma

Bicknellski

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If you do the heatsink correctly there would be no need to go to higher temp components. Having at look at the therms on the Avalon miner you can see that most of the heat is at the chip and is under 62C + the surrounding board reaches 55C + maybe? If you have the vias designed properly and with what BKKcoins has designed already I don't think we will have issues I hope.

Topic: Klondike - 16 chip ASIC Open Source Board - Preliminary - page 172. (Read 435369 times)