[SI-LIST] PCI Bus Ringing, Overshoot

Hi All,

I have a Board that is currently being routed and I'm not sure how to handle
ringing on my PCI bus (50Mhz 3.3V).
        Here's the stats:
                1. Xmission lines are 50 Ohms
                2. Three devices on PCI bus

The current placement of the three components gives me  Manhattan distances
of 10" and 3.7"


                A =============================== B =========== C
                                 <------- 10" ------->                          
  <-- 3.7" -->


I don't have much flexibility regarding the component placement.  And when
component B is driving, my simulations show me that component A is seeing
excessive overshoot and ringback(~5.5V with almost No Noise Margin).

My understanding of PCI, is that I cannot use any terminations.

Is there anything that can be done?


Thanks in advance
Simba Julian

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: