Is it possible to get a small number of chips from anywhere for testing a board design, say 4-10 chips?
megabigpower.com was selling bare chips - sold out
Topic: [ANN] Bitfury is looking for alpha-testers of first chips! FREE MONEY HERE! - page 30. (Read 176728 times)
August 16, 2013, 01:13:36 AM
megabigpower.com was selling bare chips - sold out
August 15, 2013, 11:36:48 PM
Is it possible to get a small number of chips from anywhere for testing a board design, say 4-10 chips?
August 15, 2013, 10:14:44 PM
Indeed! Gosh ... I've cut just 2 lines from my quote and one of them turns out to be the important one 
Here is the missing one:
Here is the missing one:2. IOVDD is hanging. IOREF is IOVDD/2. should be 1.8V at most (dielectric will likely broke at 2.5 V).
Seems I had a package variant of the regulator.
Though it's supposedly the same part used in the schematic (AP130-18SAG-7), in & out pins were swapped on the one I'm using.
Flipped it over on the board and it now produces a happy 1.8V.
Will keep working on the hashrate issue.
Thnx all - didn't intend to turn this into my personal help thread.
August 15, 2013, 08:19:27 PM
How are your IO and core voltages ?
core voltage = 0.76VIOVDD = 2.56V (eek!)
Ouch - I recall bitfury stating 2.5V was danger zone. Have to go check the regulator …
Indeed! Gosh ... I've cut just 2 lines from my quote and one of them turns out to be the important one
Here is the missing one:2. IOVDD is hanging. IOREF is IOVDD/2. should be 1.8V at most (dielectric will likely broke at 2.5 V).
August 15, 2013, 08:10:25 PM
Try it without the clock connection, and let both chips use the internal clock.
What are the individual hash rates for each of the chips ?
What are the individual hash rates for each of the chips ?
Thnx - removing the clock line seems to have helped a bit.
Wait … are individual chip hashrates supposed to be displayed? I was assuming cgminer was displaying an aggregate:
How are your IO and core voltages ?
core voltage = 0.76VIOVDD = 2.56V (eek!)
Ouch - I recall bitfury stating 2.5V was danger zone. Have to go check the regulator …
August 15, 2013, 03:32:00 PM
CMP, CM+ and CM- that you've connected to ground are usually left not connected...
On our boards they are connected to ground. On this version of the test board, there are solder jumpers on the bottom that connect them to ground.C-scape - thanks for chiming in! I stand corrected!
I remember reading somewhere about it, and I got confused as I looked at some of the boards (where it seems to be left floating).
Bitfury actually clarified earlier how those should be:
(...)
But this is what again - likely can't be done quicky, only if very lucky and there should be no complex filtering/anti-resonance issue between chips in a string (you see - we now connect CMMINUS, CMQ, CMPLUS to GND).
1. INCLK should be tied to power or ground in case if it is not connected to clock generator. Otherwise if it will be floating, especially near half-voltage - it will case spontaneous oscillations.
Better to feed it with oscillator, but don't feed less than 100 Mhz, or feed MUCH less than 100 Mhz as you can find bad package resonance.
(...)
But this is what again - likely can't be done quicky, only if very lucky and there should be no complex filtering/anti-resonance issue between chips in a string (you see - we now connect CMMINUS, CMQ, CMPLUS to GND).
1. INCLK should be tied to power or ground in case if it is not connected to clock generator. Otherwise if it will be floating, especially near half-voltage - it will case spontaneous oscillations.
Better to feed it with oscillator, but don't feed less than 100 Mhz, or feed MUCH less than 100 Mhz as you can find bad package resonance.
(...)
August 15, 2013, 02:27:35 PM
CMP, CM+ and CM- that you've connected to ground are usually left not connected...
On our boards they are connected to ground. On this version of the test board, there are solder jumpers on the bottom that connect them to ground. August 15, 2013, 02:13:34 PM
I assembled a couple of c-scape's adapter boards (slightly modified design to meet OSHPark specs)
Running one board from the Pi works quite well. ~1.5GH/s + surprisingly low temp = awesome.
Impressed that it worked on the first attempt - especially considering all the hand soldering I did
http://i1289.photobucket.com/albums/b517/LaserHorse/BitfuryAdapter-LH-med_zpsbab373b9.jpg
When I attempt to chain a second board, cgminer recognizes the second chip, but the total hashrate drops below 1GH/s.
hmmm … anyone notice anything I'm doing incredibly wrong here?
thnx all!
Running one board from the Pi works quite well. ~1.5GH/s + surprisingly low temp = awesome.
Impressed that it worked on the first attempt - especially considering all the hand soldering I did
http://i1289.photobucket.com/albums/b517/LaserHorse/BitfuryAdapter-LH-med_zpsbab373b9.jpg
When I attempt to chain a second board, cgminer recognizes the second chip, but the total hashrate drops below 1GH/s.
hmmm … anyone notice anything I'm doing incredibly wrong here?
thnx all!
Aside from the clock (OCLK->INCLK) that the others mentioned - the CMP, CM+ and CM- that you've connected to ground are usually left not connected... I wonder if that causes some power supply issues within the second chip. Have you look at power usage of each of the chips?
August 15, 2013, 08:41:29 AM
I assembled a couple of c-scape's adapter boards (slightly modified design to meet OSHPark specs)
Running one board from the Pi works quite well. ~1.5GH/s + surprisingly low temp = awesome.
Impressed that it worked on the first attempt - especially considering all the hand soldering I did
Running one board from the Pi works quite well. ~1.5GH/s + surprisingly low temp = awesome.
Impressed that it worked on the first attempt - especially considering all the hand soldering I did
Nice work! I expect to have my ten chip prototype board on tuesday
August 15, 2013, 06:40:06 AM
bi•fury boards are in:
intron
intron
Really fucking great .... Cant wait to get some in my hands
August 15, 2013, 06:00:11 AM
n1 man! looks great waiting to see first protos hashing!
August 15, 2013, 05:58:47 AM
bi•fury boards are in:
intron
intron
August 15, 2013, 03:02:39 AM
hmmm … anyone notice anything I'm doing incredibly wrong here?
thnx all!
thnx all!
Remove the clock line connections and try again.
Like the color though:)
intron
August 15, 2013, 02:54:29 AM
hmmm … anyone notice anything I'm doing incredibly wrong here?
Try it without the clock connection, and let both chips use the internal clock. What are the individual hash rates for each of the chips ? How are your IO and core voltages ?
August 15, 2013, 02:54:01 AM
Should be no need to connect oclk from board #00 to inclk board #01.
August 15, 2013, 02:38:31 AM
I assembled a couple of c-scape's adapter boards (slightly modified design to meet OSHPark specs)
Running one board from the Pi works quite well. ~1.5GH/s + surprisingly low temp = awesome.
Impressed that it worked on the first attempt - especially considering all the hand soldering I did
When I attempt to chain a second board, cgminer recognizes the second chip, but the total hashrate drops below 1GH/s.
hmmm … anyone notice anything I'm doing incredibly wrong here?
thnx all!
Running one board from the Pi works quite well. ~1.5GH/s + surprisingly low temp = awesome.
Impressed that it worked on the first attempt - especially considering all the hand soldering I did
When I attempt to chain a second board, cgminer recognizes the second chip, but the total hashrate drops below 1GH/s.
hmmm … anyone notice anything I'm doing incredibly wrong here?
thnx all!
August 11, 2013, 09:24:34 PM
Done.
intron
intron
Looking forward to seeing this USB solution in the general public's hands
Keep up the great work.
I can give the CAD file (edit: of the heatsink), so you can do it yourself.
Not really very much to it:)
intron
August 08, 2013, 10:50:07 AM
That heatsink looks cool
August 08, 2013, 02:28:16 AM
Done.
intron
intron
Looking forward to seeing this USB solution in the general public's hands
Keep up the great work.
I can give the CAD file (edit: of the heatsink), so you can do it yourself.
Not really very much to it:)
intron
August 07, 2013, 09:30:29 PM
Any idea who is going to make and sell the devices?
And more importantly the every present questions: when?/how much?The rest is really academic (well other than speed).
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