David Brown wrote: > On Thu, Aug 28, 2008 at 11:49:10PM -0700, [EMAIL PROTECTED] wrote: >> On Thu, Aug 28, 2008 at 08:54:26PM -0700, David Brown wrote: >>> You probably don't want to be doing a full RSA signature every minute, >> >> Would the CPU stay any cooler just busy waiting versus doing something >> useful like calculating RSA signatures? > > Temperature isn't the issue, it's power. I assume someone wants the > thing to run off of a small battery. Halting the CPU will consume > very little power, whereas active computation will consume thousands > of times more, if not even more.
This thing is supposed to be a USB device. If so, it can draw power from the PC it's connected to. That will give you 2.5 watts to work with. The battery only needs to power the clock. A cell for a watch should let it run for at at least a year depending on your design. Gus -- [email protected] http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list
