Re: [Gumstix-users] Homebrew JTAG

[Dave H. <dhy...@gm...>]

Hi Steve,

On 2/1/06, Steve Bullock <ste...@gm...> wrote:
> I've gone and bricked my basix, and am trying to JTAG it back to life
> - I don't want to lose the time it'd take to send it back from the UK.
>  I'm looking at the JTAG wiki page,
> http://www.gumstix.org/tikiwiki/tiki-index.php?page=3DJTAG, and the
> armkits page linked from that,
> http://www.armkits.com/Product/jtagcable.asp.
>
> There's a couple of connections I'm not sure about - on the wiki page
> there's NRESET and NTRST, but the armkits page has nSRST and no reset.
>  Anyone got any hints?

Matching up the 20 pin headers, NRESET goes to pin 15, which is nSRST.
NTRST goes to pin 3, which the armkits leaves unconnected.

According to ARM, NTRST is optional:
http://www.arm.com/support/faqdev/4182.html

--
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/