Author: Roy Eassa
Date: 14:22:53 06/19/02
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On June 19, 2002 at 15:51:40, Tom Kerrigan wrote: >>"The PXA250 can run at 400 MHz while using the same amount of power as a 206 MHz >>StrongARM chip. But in order for this to happen, the handheld's operating system >>needs to be optimized for the PXA250. >> >>Pocket PC 2002 isn't and therefore will be limited to 200 MHz. A version of that >>operating system that is optimized for Xscale may not be available until 2004." > >The PXA250 might have special power-saving logic that's controlled by the >operating system, so the PocketPC OS might need new code to get power >consumption down to the advertised levels (i.e., as low as a 206MHz SA). But >just because the PocketPC OS might not be power-consumption friendly doesn't >mean it forces the chip to run at 200MHz, which is apparently the conclusion the >article is drawing. > >That's sort of like buying a 2GHz Pentium but only being able to run it at 1GHz >when you're using Linux. Things just don't work that way. > >-Tom OK. I understood it to mean that the chip essentially runs at 200 MHz by default and requires a special instruction from the OS to make it run in a special high-power-consumption "turbo" mode (up to 400 MHz), which it would then do only for a short burst of time until the next such instruction.
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