[SI-LIST] Re: pci bus--> 5V = ancient history
- From: "Salkow, Steven" <steven.salkow@xxxxxxxx>
- To: dan1_st@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Thu, 10 Jan 2008 16:13:28 -0800
The PCI Specification calls for 2 different connector configurations,
and 3 different keying options. These differences are for both the
32-Bit & 64-Bit PCI Busses.
In PC's, the inclusion of +5V was to allow cards to be installed where
the majority of the power suppy capacity available was from the +5 rail
(ayt that time). This is ancient history and unless you making boards to
fit ancient equipment or legacy boards plug into you background you can
forget about providing the +5V supply or the capability of interfacing
to or allowing mixes of +5V I/O of any sort. Key everything for 3.3V.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of david stern
Sent: Thursday, January 10, 2008 2:56 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] pci bus
hello all
I am working on a new project which includes a PCI bus.
I am not familier with this bus and I will appriciate to get any
material or links
about SI issues in PCI bus design.
I dont understand the voltage supply to the bus. If i have a 3.3V key
it means that the
card works with only 3.3V so why to supply 5v to the board?
Thanks in advance
David
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