I wasted an evening trying to debrick an sb4100,it turns out I was using a +3.3v (measured with a digital voltmeter)from a different spot that wasn't good enough.Once I used the spot from this page it worked 1st try.I did throw 2 different scripts at it,but that may have just been a coincidence. http://www.usbjtag.com/jtagnt/sb4100.php
The 1st script still had the jumper from CE to +3.3v,hence the FFFF/FFFF id.
Then I took the jumper off and ran the second script which gave me the correct id.
usbbdm wrote:4100 no longer need those pokes. If LPT works and NT does not work then it is the JTAG clock (use 3M or 6M with "speed 2" or "speed 1") might work.
Intresting. I Always Recommend Using the Slowest Speeds For DeBricking any Target.
"If you give a man a fish you feed him for a day. If you teach a man to fish you feed him for a lifetime."
TUNDRA wrote:Strange you Had to go thru all that. I fix those Easy with the LPT JTAG and Toms JTAGUtility Proggy.
I had toms jtag at one time but that hardrive got wasted and I couldn't find my lpt jtag cable.
I would have to start from scratch with toms.
Important note:remove the CE wire when done.I left mine on for future use
and it wreaks havoc with programming and normal modem operation.The wire
acts like an antenna an puts noise on the CE line.
slugworth wrote:I had toms jtag at one time but that hardrive got wasted and I couldn't find my lpt jtag cable. I would have to start from scratch with toms.
Important note:remove the CE wire when done.I left mine on for future use
and it wreaks havoc with programming and normal modem operation.The wire
acts like an antenna an puts noise on the CE line.
Why? Its simple and stragit foward. and you use same commands as with the USBJTAG NT So its very Difficult to Forget if your used to using the USBJTAG NT.
Just detect
ldram 9fc00000
program 9fc00000 200000
Can't get any Easyer than That.
"If you give a man a fish you feed him for a day. If you teach a man to fish you feed him for a lifetime."
slugworth wrote:Michael J. Fox soldering school.
I would have to find the diagram and make a cable.And we are having a blizzard and I can't get out to buy the parts.
LOL
Here See if this Helps
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"If you give a man a fish you feed him for a day. If you teach a man to fish you feed him for a lifetime."
I just found the cable I made long time ago for toms.
It was a variation of that pic,it uses a 33ohm for TDO instead of the usual 100ohms,since that is an output from the device to pc.
Were there different versions of toms jtag?I don't remember.
Toms had a problem with the tnetc4401 processor,and then I ended up bricking the dcm202 at that time.So I stayed with using usbjtagnt for my working modems.
slugworth wrote:I just found the cable I made long time ago for toms.
It was a variation of that pic,it uses a 33ohm for TDO instead of the usual 100ohms,since that is an output from the device to pc.
Were there different versions of toms jtag?I don't remember.
As you will notice theres a Schematic with out the resistors and works just as well, So going with 33 Ohms on all Resistors instead of the 100Ohms is No Big Deal.
"If you give a man a fish you feed him for a day. If you teach a man to fish you feed him for a lifetime."