5V board in a 3.3V PCI slot

M

marco p.

Guest
Hi,
I have a problem with a Dialogic board "DM/IP301-1e1-PCI".
I installed that board in a Piv 1.6Ghz Mainboard D845WN and I can't do
it starts. The board's power requirements are 22.5W @ 5V, and using PC
Wizard I see that the PCI slot used by the Dialogic board has this
description: "In Use (32-bit) 3.3v".
Is this a problem?
Does the board fail to start by this reason?
Can I make the board and the Mainboard compatible?
thanks!
Bye
 
marco p. wrote:

Hi,
I have a problem with a Dialogic board "DM/IP301-1e1-PCI".
I installed that board in a Piv 1.6Ghz Mainboard D845WN and I can't do
it starts. The board's power requirements are 22.5W @ 5V, and using PC
Wizard I see that the PCI slot used by the Dialogic board has this
description: "In Use (32-bit) 3.3v".
Is this a problem?
Does the board fail to start by this reason?
Can I make the board and the Mainboard compatible?
thanks!
Bye
Click to expand...
PCI slots are either 3.3V or 5V

PCI boards are 3.3V, 5V, or
universal (fits in both 3.3V or 5V slots)

PCI slots and cards are mechanically
keyed to prevent plugging cards into
incompatible slots.

Even 3.3V slots provide 5V power supply.

So the dialogic board must be a 3.3V or
universal card or it would not fit in
the 3.3V slot.

PCI slots are required to provide 25W total power
to each slot, so the dialogic requirements are
high, but within spec.

--
Paul Fulghum
paulkf@microgate.com
 
Paul Fulghum wrote:
marco p. wrote:

Hi,
I have a problem with a Dialogic board "DM/IP301-1e1-PCI".
I installed that board in a Piv 1.6Ghz Mainboard D845WN and I can't do
it starts. The board's power requirements are 22.5W @ 5V, and using PC
Wizard I see that the PCI slot used by the Dialogic board has this
description: "In Use (32-bit) 3.3v".
Is this a problem?
Does the board fail to start by this reason?
Can I make the board and the Mainboard compatible?
thanks!
Bye


PCI slots are either 3.3V or 5V

PCI boards are 3.3V, 5V, or
universal (fits in both 3.3V or 5V slots)

PCI slots and cards are mechanically
keyed to prevent plugging cards into
incompatible slots.

Even 3.3V slots provide 5V power supply.

So the dialogic board must be a 3.3V or
universal card or it would not fit in
the 3.3V slot.

PCI slots are required to provide 25W total power
to each slot, so the dialogic requirements are
high, but within spec.

--
Paul Fulghum
paulkf@microgate.com
Click to expand...
I am almost sure you don't have any 3.3V on your PCI Slot.

We have designed over 10 different PCI cards for different custom
projects based on our komodo board.
On the first prototyping board we were using both 5V and 3.3V from the
PCI Slot. Now all our new PCI boards use only 5V. Why? just because a
large part of motherboards *DO NOT PROVIDE* 3.3V on the PCI slots.

See our Komodo picture to find where is B side (slot side) and A side
(http://www.amontec.com/komodo.shtml)

You can verify your 3.3V on PCI finger pin no
B-25 B- for B side
B-31
B-36
B-41
B-43
B-54
A-21 A- for A side
A_27
A-33
A-39
A-45
A-53

Just take time to measure the voltage on one of these point !!!

Laurent Gauch
www.amontec.com
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Amontec Team wrote:
I am almost sure you don't have any 3.3V on your PCI Slot.
Click to expand...
The motherboard claims PCI 2.2 compliance which requires 3.3V
be supplied to all slots (on PCI 2.1, 3.3V supply was optional).

Marco:

Take a look at this errata for the mainboard:

http://support.intel.com/support/motherboards/desktop/sb/CS-009038.htm

--
Paul Fulghum
paulkf@microgate.com
 
Yes if the motherboard is in the PCI 2.2 spec. But anyway, I would
verify the 3.3V !

following CS-009038, your BIOS revision should be P05 or higher !

Larry
www.amontec.com

Paul Fulghum wrote:

Amontec Team wrote:

I am almost sure you don't have any 3.3V on your PCI Slot.


The motherboard claims PCI 2.2 compliance which requires 3.3V
be supplied to all slots (on PCI 2.1, 3.3V supply was optional).

Marco:

Take a look at this errata for the mainboard:

http://support.intel.com/support/motherboards/desktop/sb/CS-009038.htm

--
Paul Fulghum
paulkf@microgate.com

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You can't count on having a 5-volt supply on your 3.3V PCI bus.
You also can't count on having a 3.3-volt supply on your 5V PCI bus.

The PCI spec specifies that both should be there, but my development
team was caught with these "gotchas". The real world implementation of
the PCI spec does not guarantee the presence of both supplies in
commercial PCs.

If you are able to physically install the Dialogic card in your
Mainboard slot, and the Dialogic card requires 5V, then the card must
have universal PCI card slot keys. Electrically, however, it won't work
if your mainboard doesn't supply 5 volts to the 3.3-volt PCI slots.

They are basically incompatible unless you do some mainboard mods that
are not guaranteed to work with the card, and may kill compatibility
with other cards.

I'd recommend replacing the card. 3.3V PCI slots are becoming the norm,
especially with PCI-X gaining wider acceptance.

Dwayne Surdu-Miller
 
Thank you very much for your help.
I installed successfully another Dialogic Board (D\4pciu) that is
universal, and can work with 3.3v and 5v supply. This board has been
detected and I can start it. So is the previous board incompatible
with my hw? The board has got a green led that swithes on and a yellow
led that flushes....
Or is the board broken? what do you think about it?
Thanks!
Bye Marco
 
I'd suggest trying the board in an older PC that has 5-volt PCI slots.
It might simply be incompatible with your newer mainboard's 3.3-volt PCI
slots.

Best regards,
Dwayne Surdu-Miller
 
Dwayne Surdu-Miller <miller@sedsystems.nospam.ca> wrote:
: I'd suggest trying the board in an older PC that has 5-volt PCI slots.
: It might simply be incompatible with your newer mainboard's 3.3-volt PCI
: slots.

I found several boards incompatible the other way round: Indicating an
"universal board" by having to slots in the connector row, but not running
in a boards that only supply 5 Volt. I'm glad, that I have a soldering iron
and low drop 3.3V regulators :)

Bye
--
Uwe Bonnes bon@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik Schlossgartenstrasse 9 64289 Darmstadt
--------- Tel. 06151 162516 -------- Fax. 06151 164321 ----------
 
We had to fix our first prototype the same way... a "universal solution" :)
 
Uwe Bonnes wrote:
Dwayne Surdu-Miller <miller@sedsystems.nospam.ca> wrote:
: I'd suggest trying the board in an older PC that has 5-volt PCI slots.
: It might simply be incompatible with your newer mainboard's 3.3-volt PCI
: slots.

I found several boards incompatible the other way round: Indicating an
"universal board" by having to slots in the connector row, but not running
in a boards that only supply 5 Volt. I'm glad, that I have a soldering iron
and low drop 3.3V regulators :)

Bye
Click to expand...
The worst thing I've seen is a PCI card claiming to be universal. But
the IO pins were driven by the 5V rail and not the VIO rail. So when you
plug it in a 3.3V slot, it starts sending 5V !
 
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