[SI-LIST] Re: PCI Rise/Fall Time
- From: "Peterson, James F \(EHCOE\)" <james.f.peterson@xxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 15 Feb 2007 05:58:55 -0600
Kenny,
The PCI standard specifies a test load for measuring the slew rates. It
does not include the 33 ohm series resistor, so you'll be ok. (I think
it's still 1k Pullup, 1K Pulldown, and a 10pf pulldown....)
Jim Peterson
Honeywell
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Kenny Frohlich
Sent: Thursday, February 15, 2007 12:29 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] PCI Rise/Fall Time
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. =20
=20
Can you help me fix this issue?
=20
Thanks,
Kenny
=20
=20
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=20
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