Specifications missing in the data sheet
I recently tried to find out what's the "official" maximum clock frequency the P2 can run. I found out that this is not clearly specified in the current data sheet. In fact, almost nothing is clearly specified! In the "AC Characteristics" there are only two parameters listed. And to me it's not clear if the maximum frequency of 320MHz is really the frequency the processor is guaranteed to operate reliably over the full temperature and supply voltage range. I think it's not and the 320MHz max is only the limit for the PLL.
In my opinion, if the P2 is to be taken seriously for any commercial product then there have to be a lot more specifications in the data sheet a disigner can count on. I know, most of us here in the forum are hobbyists or "hackers" who don't care much about paperwork and simply try out how far they can go. But if you work for a company you need to decide if this chip fits your requirements or not. You can't just invest man months of development and later find out that your product only works due to "good luck".
I know, not all parameters are tested or can be guaranteed. But even if a limit is only specified as "typical" value it helps estimating what is possible and what is not.
So here is my wish list what should be included in the data sheet:
- max. clock frequency for reliable operation over full temperature and supply voltage range
- typical overclocking capability in a narrower but well defined range
- ADC performance: max. gain and offfset error (calibrated), typical SNR for at least one set of conditions (sample rate, resolution, filter mode, gain mode)
- DAC performance: max gain and offset error, -3dB cutoff frequency
- tolerances for low-level pin drive modes (1.5k to 150k pullup/pulldown, 10uA to 1mA current)
- levels and tolerances for schmitt trigger and comperator input modes