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mura_krish
Joined: 07 Jun 2006
Posts: 10
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 14 Sep 2007 9:54 JTAG PROBLEM |
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Hi.,
im working in ARM module 4m samsung s3c2410 processor...... and its 3.3V supply
JTAG is not detecting my processor id...... processor is working good......
i have checked the voltage levels in that i have doubt in TDO voltage level and TMS voltage level..... so can any one tell me what the prob is ...... or give some related documents about JTAG signal characteristics.........
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gowthamn
Joined: 06 Apr 2006
Posts: 35
Helped: 1
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| 14 Sep 2007 11:46 Re: JTAG PROBLEM |
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Hi,
I suggest one thing for probing JTAG, kepp giving 10 inputs for the TDI and then keep probing the TDO hopefully you should get some signal on TDO. If still not any signal then one of the component may not be conected properly.
I used to probe with TDI for more than 20 cycles in case the target is not getting detected.
Hope this works, u also can refer the IEEE 1149.1 standard for any specific details.
Cheers
Gowtham
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andre_teprom
Joined: 07 Nov 2006
Posts: 169
Helped: 11
Location: BRAZIL - Rio de Janeiro
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| 14 Sep 2007 14:15 Re: JTAG PROBLEM |
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mura_krish,
I had noticed some problems at JTAG regarding :
- Cable size ( greater than 150-200 mm )
- Paralel port ( at some PC's )
+++
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tom_hanks
Joined: 28 Aug 2003
Posts: 243
Helped: 13
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| 25 Sep 2007 15:34 Re: JTAG PROBLEM |
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| Check whether ur JTAG s/w support this device & family..
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muralicrl
Joined: 06 Feb 2008
Posts: 282
Helped: 30
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| 17 Mar 2008 9:28 Re: JTAG PROBLEM |
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Hi,
See the attachment, which describes the JTAG standard.
If you need more information, contact me.
Regards,
N.Muralidhara
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BholaPehlwan
Joined: 10 Jun 2008
Posts: 2
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| 10 Jun 2008 4:49 Re: JTAG PROBLEM |
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| There is also some good material on Xilinx website.
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sparso
Joined: 30 Dec 2006
Posts: 63
Helped: 1
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| 10 Jun 2008 5:08 JTAG PROBLEM |
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| Can you point to any specific xilinx app note?
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sos
Joined: 04 Apr 2008
Posts: 39
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| 14 Jun 2008 14:37 Re: JTAG PROBLEM |
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if u r working with keil and their u t trying to detect the processor than i think u can try for manual settings.
i have worked with ulink device and their r two options:one for manual settings and other for manual.
let me know sth more abt the problem
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McShamrock
Joined: 29 Oct 2006
Posts: 37
Location: ITALY - Sardinia
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| 08 Jul 2008 14:22 Re: JTAG PROBLEM |
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Hi,
if it is a problem of TDO or TDI, it depends on components/layout: they could be bad mounted or broken.
Actually, sometimes I experience problems in VIO compatibility between host processor and JTAG adaptor. I am used to inserting diodes in NTRST and RESET signal lines in order to fix it.
Hope this help.
N.S.
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sakthivel.s
Joined: 22 Jan 2008
Posts: 9
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| 01 Sep 2008 7:57 Re: JTAG PROBLEM |
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Actullay,
For ARM controllers, If the PLL Setting is wrong, Jtag will not detect the device. You can detect the Micro using Manual mode annd correct PLL Setting and do programming then change it automatic
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Enlightenment
Joined: 26 Jul 2006
Posts: 28
Location: 3rd Rock From Sun
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| 15 Sep 2008 2:08 JTAG PROBLEM |
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| If your ARM starts up with a slow clock (32.768KHz), then you will have to run your initial JTAG clock at a very slow rate, until you get its PLL configured to run at full speed. Some have an RCLK output that you should use instead. This is the way it works from some other vendor ARM processors. I have never used the s3c2410.
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