Re: PCI IO Buffers

[Ivor Bowden <ivor@peritek.com>]

Hi Sean,
Make sure you use parts that have PCI compliant IO pins.
Make sure you observe length rules: 1.5 inches max from
PCI edge connector pin to PCI device, 2.5 +/- .1 inches
for the clock line. Make sure PCB impedance is correct: 
60 - 100 ohms. If you have more than one device on an
card you must use a bridge, so there is only one device
pin connected to each PCI edge connector pin.
Ivor

At 02:14 PM 6/21/00 -0700, you wrote:
>
>Hi,
>
>I am interrested to get more information on
>board layout requirements  conneting multiple
>pci devices on the same board, considering that
>pci io buffers are designed to drive to half way and
>relying on the reflection to swing the voltage to full
>level.
>Are there any tricks we need to do to  our board to
>make sure we meet the pci io buffer reflection requirement ?
>
>
>Thansk,
>Sean Ganjooi
>
>
>