Re: 33/66MHz operation.

[Neal Palmer <neal@dinigroup.com>]

I don't know how they could install it into a 66Mhz slot unless they
plugged the 32-bit card in backwards.

But if they didn't plug it in backwards, VCCIO which is tied to 3.3V on
the backplane would be tied to 5V on your card.  So yes, something is
going to burn up.  If you are lucky, your power supply would have realized
that there was a problem, and not turned on in the first place.

On Mon, 2 Apr 2001, GEORGE, Peter (Newcastle) wrote:

>
> Hi all,
>
> I have designed a PCI expansion card which utilises an Oxford Semiconductor
> OX9160 bridge chip. This is a 33 MHz device, fully compatible with version
> 2.2 of the PCI Spec. The PCI card itself has the 5V footprint. According to
> the specification, this makes my card incompatible with 66MHz operation.
> They have only ever been installed into PCs with 33MHz PCI buses.
>
> However, inadvertantly, my colleagues have intalled my boards into PCs with
> 66MHz buses. The boards are now not operational. Is it likely that
> installing my boards into a 66MHz bus would fry the PCI chips?
>
> Many thanks,
> ______________________________________________________________
>
> Peter George
> Project Manager
> LEONI Wiring Systems UK Ltd
> Lower Milehouse Lane
> Newcastle under Lyme		DDI	01782 604749 / 88
> Staffordshire			fax	01782 563250
> ST5 9BT			e-mail	peter.george@leoniwiring.co.uk
> ______________________________________________________________
>
>

-- 
-- Neal Palmer

The Dini Group
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