Questions about PCI

["Jim Chan" <tan264@hotmail.com>]

Hi guys

I just have a few questions regarding PCI bus.

1. Is there any way to fix the PCI frequency? According to the spec, 
components designed for use on the system motherboard may operate at any 
single fixed frequency up to 33 MHz, and may enforce a policy of no 
frequency changes. How could we do this? I am trying to drive the PCI clock 
with a zero delay PLL clcok driver, so i need to make sure the PCI frequency 
doesn't change.

2. According to PCI spec. , any unused +5V and 3.3V pins on the PCI edge 
connector provide an AC return path, and must be coupled to ground plane. 
THE DECOUPLING MUST AVERAGE AT LEAST 0.01 microF PER VCC PIN. What does this 
means? Does it means there is no need for a decoupling capacitor for each of 
the 3.3V pin(there are 6 3.3v pins on each side) as long as the average is 
0.01.  I have looked at some PCI add-in cards, there only have two 
decoupling capacitors to decouple the 3.3V pins.

3. Related to Question2, what about the +/- 12 V pins.Do they need any 
decoupling, or i just connect them to ground.

Thank you for your time

Regards

Jimmy tan



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