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Message
From: "Damjan Lampret" <lampret@o...>
Date: Fri, 29 Aug 2003 20:56:31 +0200
Subject: Re: [openrisc] OR1200 Power Consumption
Brian,
there is no precise power consumption analysis, more like an estimate. If
you want a very precise estimate, and a low power consumption, synthesize
OR1200 with clock gating, and run dhrystone code and use node toggling to
calculate power conumption. The result should be in the range of ARM946E.
regards,
Damjan
----- Original Message -----
From: "Brian Adams" <brian.adams@a...>
To: <openrisc@o...>
Sent: Friday, August 29, 2003 8:41 PM
Subject: [openrisc] OR1200 Power Consumption
> Damjan,
>
> I've been comparing some of the specs for the OR1200 with that of
> various ARM processors. (specifically the ARM7 and ARM9 varieties) From
> the info in the OR1200 overview it compares quite favorably in speed and
> area, but not so well in power. For example, the 0.18u ARM920T is
> advertised as consuming 0.8mW/MHz, while the OR1200 is advertised at
> <0.5W at 250 MHz (@50%). Assuming a linear relationship that would mean
> the OR1200 is ~2mW/Mhz. Does this seem right to you. Do you know what
> configuration you used to get the above figure? I'm trying to justify
> (to others) using the OR1200 for many reasons, but 2x power consumption
> is troubling. I was hoping there was a simple (any possibly obvious)
> explanation.
>
> Thanks,
> Brian
>
>
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