Rongxi,
Please elaborate when you say "It failed to start if there were two 18pF
capacitors connected between its crystal and ground." What crystal
frequency and what capacitor values have you found to work without failure?
We have been having problems with ADSP-21262's in production boards
occasionally failing to boot (VDSP JTAG debugger can't even connect). We
changed crystal capacitors to 18pf (as well as better 1.2V core supply
improvements) and the failure rate is lower but still not 0%.
Thanks,
Gene
> From: "phychem" p...@hit.edu.cn
> Date: Sun May 7, 2006 6:22am(PDT)
> Subject: Re: FW: Debug problem for ADSP-21262
>
> Hi!
> Thank you Sergio and Todd. I tried overnight and solved the problem. I
> removed the two 22pF capacitors from the DSP crystal and it works
> fine...The same problem happened a few days ago when we were debugging a
> board of ADuC7020.It failed to start if there were two 18pF capacitors
> connected between its crystal and ground. It is quite strange rite?
>
> Regards,
> Rongxi
