Re: [coreboot] Memory clock cycles -> microseconds (us)

[Peter Stuge]

On Mon, Jun 09, 2008 at 01:36:29PM -0400, Joseph Smith wrote:
> > > > > Does anyone know the mathematical formula for converting memory
> > > > > clock cycles into microseconds (us)??
> > > >
> > > > 1 MHz means 1 million clock cycles per second, so 1 clock cycle
> > > > per microsecond.
> > > >
> > > > 166 MHz -> 166 clock cycles per microsecond.
> >
> > The formula is: t=1/f
> >
> > If f=1000000, each cycle is 1/1000000 seconds, or 1 microsecond.
> > If f=166000000, each cycle is 1/166000000 seconds, or 1/166 us = 6 ns
>
> Ok, let me get this straight. So in my case the memory is PC133
> which is 133 MHz. So each clock cycle is 1/133 us? And, to delay for
> 3 clocks would be 3/133 us = 22 ns?

Yes sir, that's correct!

//Peter