Lpc2000

--- In lpc2000@yahoogroups.com, "seangra" <sgraham@o...> wrote:
>
> Hey, any more tests done on this?
> 
> I remember back in the early pentium days, getting a P133 and having 
> a very good probability of overclocking to 200MHz.
> 
> You could always do an overclock using the same method that is used 
> for SDRAM -- SPD eeprom I believe it is.  Since the overclocking can 
> be done via software, set up a brute force test that runs on every 
> chip, and keep upping it until it becomes unstable :)
> 
> On that note, since there is an internal multiplier for the 
> frequency, is there any benefit to having a higher frequency 
> external oscillator?  I.e. Is there any difference to performance if 
> I use an external 5MHz with 12x multiplier, or external 20MHz with 
> 3x multiplier?

I still have to do the 10Mhz test.  As far as using 5Mhz external, you
have to remember that the PLL will only accept something in between 10
Mhz and 25 Mhz, not any lower.  It would be interesting to test if the
PLL will run with external oscillator of less then 10Mhz.  As far as
whether it makes any difference if you use a 10Mhz x6 or a 20Mhz x3, 
I dont think it would.  Another interesting test would be running at
3.5 or 3.6V and seeing if you can hit 100 Mhz stable, boosting voltage
always helps when overclocking.

Mark