Re: looking for PCI clock driver

[Jose Franciso Toledo Alarcon <Jose.Toledo@cern.ch>]

Stuart,

I use the CY2309 zero-delay clock buffer from Cypress in a PCI design and
it works fine. I have also seen some other designs using the same device.
It has 9 clock outputs and an internal PLL that guarantees an
output-to-output skew of less than 250 ps. The only drawback I see is that
minimum clock frequency is 25 MHz if you want to use the internal PLL
(i.e., to have a low output-to-output skew).

It is not fully PCI compliant in the sense that clock frequency has to be
al least 25 MHz. But if your clock is fixed at 33 MHz you can use it.

======================================================
Jose Toledo
EP Division, Electronic Design Group
European Organization for Nuclear Research (CERN)
Geneve, Switzerland
Geneve, 23. CH-1211
-------------------
Phone: +41 22 767 8596
Fax:   +41 22 767 5909
======================================================

On Fri, 18 Aug 2000, Stuart Adams wrote:

>  I am implementing an embedded PCI system
>  with a couple of expansion slots. I need to
>  generate 6 or so 33 MHz PCI clocks.
> 
>  However, I have not found any non-PC 
>  specific clock generators which claim
>  to be PCI compliant. 
> 
>  Since the PCI clock are point-to-point
>  can I just use a generic clock buffer/driver ??
> 
>  Are there any zero delay clock buffers
>  which are PCI compliant ???
> 
> Thanks,
>   Stuart