Jtagging A 301.013...

[JShin]

I'm not completely sure how to do it so I figured I'd better ask, how do you Jtag this IRD (301.013) from the top, and do you need a special Jtag device to do it?

[Qrash]

I have worked on many DP301.013s and use a simple Jtag device ... surprisingly have had better success than with a buffered one with the 013s... and keep the whole cabling (to my laptop LPT port) to less than eight inches. Since I work on so many DP301.013s, I take a two-inch CAT5 stub with an RJ45 plug (you can simply use the stump from the end of any ethernet cable) and permanently solder to pads (top-of-board) as listed below. I then connect my Jtag (also with an RJ45 plug) via a RJ45 coupler (Radio Shack 278-2037). This way I can snap-in and snap-out with good gold contacts whenever I may need to.

From top-of-board ...
Pad Signal
9 TMS
11 TCK
13 TDI
15 TDO
19 TRST
20 Ground

Make sure your Jtag Pad-Signal connections are consistent, Ground R79 (not always necessary for a read, but advisable) and insure you are using a jKeys version with the single-TSOP 301 definitions ... Qrash

P.S. - You should also check the sticky in this section titled: "301.13 single TSOP, JTAG, VID mod, and resurection guide"

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[JShin]

Thanks very much, you explained that perfectly, I appreciate your help!

[Qrash]

Hi qrash,
I had thought about doing that exact thing. The only thing I'm not sure about is this: I know you are connecting the jtag to the coupler, but from the coupler, are you using an rj45 cable soldered into a 25 pin connector? That might be a stupid question considering you put this in there:

Pad Signal
9 TMS
11 TCK
13 TDI
15 TDO
19 TRST
20 Ground

but I wasn't sure if you were saying to make these connections via the coupler and rj45's from the jtag to the 25 pin. If this is the case, I think I'm about done. If not, it's back to the drawing board. Thanks again...

Because I work with so many DP301.013s, here's a PDF document which (I hope) shows and demonstrates my top-of-board Jtagging methodolgy ... Qrash

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[supkp]

Because I work with so many DP301.013s, here's a PDF document which (I hope) shows and demonstrates my top-of-board Jtagging methodolgy ... Qrash

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Qrash,

Last picture on your pdf file, can you explain to me those wires on the right of the jtag connector for, specially the one just below jtag connector?
Also left picture on page 2, white wire just above jtag connector what is use for?

Thanks,
supkp

[indal_98]

Looks like the VidmoD to me....

[Qrash]

Qrash,

Last picture on your pdf file, can you explain to me those wires on the right of the jtag connector for, specially the one just below jtag connector?
Also left picture on page 2, white wire just above jtag connector what is use for?

Thanks,
supkp

I hope the attached PDF file provides clarification ... Qrash

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[supkp]

I hope the attached PDF file provides clarification ... Qrash

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Qrash,
Thanks for the link to your mods. I tried everything to get my DP301-13 to work.
I know my jtag is working (unbuffer), and all the wirings are correct. I can not get the IRD# and BK using jkey application. I hope someone can come up with something like JY fix for DP301-13. What is my next step from here beside remove the chip and put it in socket and re-program with known good TSOP.
You can PM me or post it here.
Please help.
Thanks,
Supkp

[Qrash]

Qrash,
Thanks for the link to your mods. I tried everything to get my DP301-13 to work.
I know my jtag is working (unbuffer), and all the wirings are correct. I can not get the IRD# and BK using jkey application. I hope someone can come up with something like JY fix for DP301-13. What is my next step from here beside remove the chip and put it in socket and re-program with known good TSOP.
You can PM me or post it here.
Please help.
Thanks,
Supkp

I am attaching the version of Jkeys which I use for single TSOP DP301.013s.

If you still encounter problems, I will reiterate a standing offer to forum members: I have not met a single TSOP 301.013 that I have not been able to fix (... unless one or more components have been fried). I would be willing to check it out on a no charge basis. If interesed, PM me ... Qrash

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[Qrash]

I've had several questions about the location of the DP301.013 R62 solder point ... which is a much more robust solder point option to the infamous "spot" which is the delicate terminus of the vid-mod trace cut from SB35. I hope the attached picture helps ... Qrash

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[gwba]

anyone know what i might be able to do to work around the R79 pad apparently being ripped of the top side of the circuit board. Must of been a previous attempt.
This is a 301.13.

[chep]

I've had several questions about the location of the DP301.013 R62 solder point ... which is a much more robust solder point option to the infamous "spot" which is the delicate terminus of the vid-mod trace cut from SB35. I hope the attached picture helps ... Qrash

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NOTE: the 2 "RESET" points just behind the pic of your JTAG is also a very easy point to use instead of the "SPOT" to finish up the VID MOD.


chep