On Thu, 9 Nov 2006, Michael Schmidt wrote:
> > Michael,
> >
> >> cpu_speed_min
> >> set the CPU and bus speed to their minimum values (14.7456Mhz)
> >
> > What is the limiting factor?
> > I've had a TS7200 running with cpu and mem at aprox. 2.5M, though the
> > time keeping was way out. I didn't do extensive testing.
>
> Running at the "minimum" clock speed means we are disabling the PLLs and
> running directly off the 14.7456Mhz clock. I assume if you are running slow
> then this you are somehow dividing that clock down with the PLLs instead of
> multiplying it?
Yes, dividing down the PLL clocks. I've never played with running the
CPU will PLL disabled.
It was sometime ago, but my notes state...
pll1_ps=3 Fclkdiv=4 Hclkdiv=7 => Fclk=2594KHz Hclk=1297KHz Pclk=648KHz
# clkset1=0x08f7fa5a
static current consumption 0.24A (etheroff=0.16A)
cheers
Jim
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