Re: PCI Clock arising problem

[Ivor Bowden <ivor@peritek.com>]

I've had this problem before too. The BIOS disables the clock when it 
decides there is no device in the slot. Sometimes there may be a BIOS 
setting to override that, but not in our case. I looked into poking the 
bridge bits to turn the clock back on, but wasn't sucessful in the 
alloted time. What we do now is use a switchable extender card (Catalyst 
PCIBX64), powerup with any valid device, after boot turn off the (slot) 
power, switch to DUT, turn power back on, then load the BARS, etc as 
appropriate. Once you have your device responding properly to 
configuration accesses it should not be a problem.
Ivor

Mayank Sharma wrote:
> Hi , 
> 
> Yes Both PRSNT2 and PRSNT1 signals are grounded ...
> Still the clock comes for one cycle and then goes off ?
> 
> thanks and regards
> Mayank
> 
> -----Original Message-----
> From: Venkateshwarlu V [mailto:venkateshwarluv@myw.ltindia.com]
> Sent: Thursday, January 09, 2003 6:36 PM
> To: Mayank Sharma; pci-sig@znyx.com
> Subject: Re: PCI Clock arising problem
> 
> 
> ** Proprietary **
> 
> Hi,
> Check the PRSNT signals.
> 
> 
> Venkat
> 
> 
>>>>"Mayank Sharma" <mayank.sharma@wipro.com> 01/09/03 07:01PM >>>
> 
> Hi All , 
> 
> I am using a PCI daughter card ,If I insert that card into 5V PCI Slot , PCI Clock is not seen in the Logic Analyzer or Oscilloscope , even if we remove the FPGA from the board .....then I see the clock comming up for a short time and then goes off ....afterwards.
> 
> If I insert some other daughter card into this same PCI Slot , I can see the PCI Clock , comming to the board....
> 
> Can any one help me out in knowing the possiblity of this clock problem I am facing 
> 
> thanks and regards
> Mayank 
> 
> 
> 
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