[SI-LIST] PCI Rise/Fall Time
- From: Kenny Frohlich <kenny_frohlich@xxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 14 Feb 2007 21:29:14 -0800 (PST)
Hi All,
I have a design that has a 33MHz PCI bus. There are one master (CPU) and
five PCI devices on the bus and these devices are connected in a daisy-chain
topology. There's a serial termination of 33 Ohms at the beginning of the bus
and an end termination of 3K at the end of the bus. The setup and hold times
of this PCI bus in my design are within the spec.; however, the rise and fall
times (slew rates) are not. The rates are too slow (less than 1) compared to
the spec (1 to 4). Changing the value of the serial termination to O Ohm helps
a little, but it still does not meet the spec.
Can you help me fix this issue?
Thanks,
Kenny
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