BB Jasper Slow Boot Glitch fix with TX cool runner

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esbmaepo

VIP Member
Oct 2, 2011
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Esbjerg - Denmark
Re: Jasper Glitch issue with TX cool runner

Martin C said:
The one I had which wouldn't glitch at all (well, it did but VERY infrequently) was resolved with 2 x 680pF caps. It now boots within 5-7 secs every time.
Click to expand...
So just so I'm clear about this:p

You have a 680pF cap from CPU_PLL_BYPASS to GND

and

a 680pF cap from CPU_RST to GND



I'm also having trouble with a Jasper:mad2:.
 
seanr28

seanr28

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Mar 7, 2004
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Re: Jasper Glitch issue with TX cool runner

vgopal said:
have tried some the fixes recommended here, along with a 480pf on cpu rst.

really cant figure out the jasper i have here, going to take everything out and start again, still getting about 3min boot times.

might just give up on this one and stick to a falcon.
Click to expand...

so have you tried my fix? the 0.068uF Cap between Gnd and Point A?
 
Martin C

Martin C

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Ubergeek said:
Please be more specific.
Exact caps used and where.
Click to expand...
Yep, sure. I had posted it previously but I'll put it again here.

You need 2 x 680pF ceramic capacitors. Voltage is irrelevant but fit reference I used 50V caps.

Put one between CPU_PLL_BYPASS (A) and GND.

For the other, solder one leg to CPU_RST (point D on the coolrunner) and on the other leg, solder the wire from CPU_RST on the board.
 
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[AD]

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Troll Eating Dogs
Dec 8, 2002
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Re: Jasper Glitch issue with TX cool runner

Martin C said:
Put one between CPU_PLL_BYPASS (B) and GND.
Click to expand...

Should that not be point (A) as sean has done?

-=AD=-
 
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Martin C

Martin C

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Re: Jasper Glitch issue with TX cool runner

[AD] said:
Should that not be point (A) as sean has done?

-=AD=-
Click to expand...
Apologies, corrected!

---------- Post added at 23:55 ---------- Previous post was at 23:54 ----------
esbmaepo said:
I've just tried with 2 x 100nF capacitors on a Jasper with Digilent C-Mod.

Works fine, boots every time within 3-4 secs.
Click to expand...
The Jaspers seem to be very finicky - I've just finished with one which was very inconsistent. However a 100nF between A and GND has it booting within 5 secs 9/10 times.
 
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Well got mine sorted thanks to seanr28 and Martin C.

Had to put a 68pF in the points sean mentioned and also one on D like Martin did.

This was also a BB nand (512mb)

-=AD=-
 
Ubergeek

Ubergeek

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Feb 24, 2003
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[AD] said:
Well got mine sorted thanks to seanr28 and Martin C.

Had to put a 68pF in the points sean mentioned and also one on D like Martin did.

This was also a BB nand (512mb)

-=AD=-
Click to expand...
Don't you mean a 68nF (0.068uF) ?

and it should have made any difference at all adding one to CPU_RST - did you test for any difference ?
 
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[AD]

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Troll Eating Dogs
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Bolton, Lancs. UK
Ubergeek said:
Don't you mean a 68nF (0.068uF) ?

and it should have made any difference at all adding one to CPU_RST - did you test for any difference ?
Click to expand...
Yep sorry it was (0.068uF) It was the exact same cap that seanr28 used from maplin.

Will test with out the one on D later when I get home.

-=AD=-
 
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F1Ride

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Apr 25, 2005
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Can one of you guys point me in the right direction to grab some of these?!?!? I'm in the US. Could not find the. At RadioShack!!! Any help would be appreciated.
 
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esbmaepo

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Oct 2, 2011
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Esbjerg - Denmark
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bandit123

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Jul 4, 2010
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very very interesting post
just ordered a load from maplins now just to have in case i come across any of these issues

really appreciate it alot guys thanks your new grey hairs have saved me alot of wasted time
 
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Akilles

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Oct 7, 2011
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Texas
F1Ride said:
Can one of you guys point me in the right direction to grab some of these?!?!? I'm in the US. Could not find the. At RadioShack!!! Any help would be appreciated.
Click to expand...
I don't know where you're located but I bought them in Fry's Electronics, they even have them online.... Hope this helps
 
manwithoutname

manwithoutname

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Jun 4, 2010
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Just finished my first BB Jasper (512MB) and boots every time within 5 seconds or less. I bought all those capacitors to have handy just in case but looks like I won't need them with this one.
 
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