Data Reliability
Quoted 8 lines
We've already done it. Since we have not a lot running on the system, a shutdown -h takes less than a third of a second on a 99MHz AMD Elan SC410 driving an 8Mbyte DoC2000. We didn't write any special code other than a little thingy (technical term) that watches one of the processor GPIO pins for a falling edge and executes a shutdown if it sees one. One of those funky 1F memory retention caps provides the power to do this. (Do those things scare anyone else or is it just me?)
Uhm, do you let your SC410 keep cruising at 99MHz? ISTR that these "funky
memory retention caps" (FMRC:) holds up kinda bad under heavy load. I've got myself a seriously funky MRC that's either 3F or 700uF depending on how heavy a load I've got at the point of power failure.
P.s Do you know any venues for SC4xx designs/info/refs? Considering how many people are designing with this beast there preciously little noise on the Web. Right now I'm fighting GPCSA who stubbornly asserts his right to drive *ALL* the GPIO_CS's :-) D.s
//Björn Eriksson
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Quoted 2 lines · Bjorn Eriksson
Uhm, do you let your SC410 keep cruising at 99MHz?
Nope; I have a little program that bumps it down to 8MHz as soon as powerfail is detected.
Quoted 2 lines
ISTR that these "funky memory retention caps" (FMRC:) holds up kinda bad under heavy load.
Yes. But well enough, we find.
Quoted 1 line
P.s Do you know any venues for SC4xx designs/info/refs? Considering how
I'd have to ask David (our hardware designer). He knows this thing inside and out.
Quoted 3 lines
many people are designing with this beast there preciously little noise on the Web. Right now I'm fighting GPCSA who stubbornly asserts his right to drive *ALL* the GPIO_CS's
Ooooh, that's *good*. We just bite the bullet and build more hardware when we need that sort of thing...
kira.
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