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by Unknown on Mar 30, 2004 		Not available!
hi,all
I'm using cyclone to implement pci interface in my project.But cyclone only supports 3.3v pci io standard,if the motherboard only provides 5v pci signaling environment then how to implement?
In the cyclone datasheet there is a example of driving a cyclone device with a 5v device.
A external resistor is used and the internal PCI clamp diode is enabled.If i have to do like that or use a pci level convter then another problem is that the length of pci signal traces has very tough specification.so if i use external resistors or level convters ,how should i calculate the length of the signal traces?


Highly thankful to u and sorry for my poor english!
liqiyue




(no subject)
by Unknown on Mar 30, 2004 		Not available!
Hi,

Look on the Altera Web-Site for the Application Note AN 330: Connecting
Altera 3.3V PCI to 5V PCI Bus

Marc


At 16:52 30.03.2004 +0800, you wrote:
hi,all I'm using cyclone to implement pci interface in my project.But cyclone only supports 3.3v pci io standard,if the motherboard only provides 5v pci signaling environment then how to implement? In the cyclone datasheet there is a example of driving a cyclone device with a 5v device. A external resistor is used and the internal PCI clamp diode is enabled.If i have to do like that or use a pci level convter then another problem is that the length of pci signal traces has very tough specification.so if i use external resistors or level convters ,how should i calculate the length of the signal traces? Highly thankful to u and sorry for my poor english! liqiyue _______________________________________________ http://www.opencores.org/mailman/listinfo/pci
MaCo-Engineering Dipl.-Ing. Marc Colling Schlossstrasse 50 66352 Karlsbrunn GERMANY phone : (+49) 6809 / 7020190 fax : (+49) 6809 / 7020191 mobile : (+49) 170 / 7780788 Marc.Colling@MaCo-Engineering.de www.MaCo-Engineering.de
(no subject)
by Unknown on Mar 30, 2004 		Not available!
ÀîÆæÔ½ wrote:

In the cyclone datasheet there is a example of driving a
cyclone device with a 5v device. A external resistor is
used and the internal PCI clamp diode is enabled.
I think resistors are the simplest way to protect your FPGA against 5V buses. The lenght of traces is, in first approximation, unchanged: you must consider the lenght of the resistor, too. Regards. PS: You wrote very long text lines! Say to your MUA to cut lines at 72 chars, thank's :-) -- Marco Buffa (FZS600'01) Laboratorio di Spettroscopia Digitale Dipartimento di Elettronica - Politecnico di Milano tel. +39-02-2399-4004 marcobuffa@jabber.linux.it http://marcobuffa.altervista.org "Scorrelare vuol dire smarmellare." (prof. Franco Zappa, Lezione di elettronica III)
(no subject)
by Unknown on Mar 30, 2004 		Not available!
Do you have a motherboard that use 5V environment??? It could not be an Intel or compatible board from this century. All(?) modern PCs use 3.3V signaling but they are still keyed as 5V. I have produced a PCI board based on Altera APEX EP20K400 (=3.3v) and it is working in a couple of hundred computers. It might not be according to the standard but it still works fine. Have Fun STB -----Ursprungligt meddelande----- Från: pci-bounces@opencores.org [mailto:pci-bounces@opencores.org] För Marc Colling Skickat: den 30 mars 2004 11:16 Till: Discussion list about free, open source PCI IP core Ämne: Re: [pci] (no subject) Hi, Look on the Altera Web-Site for the Application Note AN 330: Connecting Altera 3.3V PCI to 5V PCI Bus Marc At 16:52 30.03.2004 +0800, you wrote:
hi,all I'm using cyclone to implement pci interface in my project.But cyclone only supports 3.3v pci io standard,if the motherboard only provides 5v pci signaling environment then how to implement? In the cyclone datasheet there is a example of driving a cyclone device with a 5v device. A external resistor is used and the internal PCI clamp diode is enabled.If i have to do like that or use a pci level convter then another problem is that the length of pci signal traces has very tough specification.so if i use external resistors or level convters ,how should i calculate the length of the signal traces? Highly thankful to u and sorry for my poor english! liqiyue _______________________________________________ http://www.opencores.org/mailman/listinfo/pci
MaCo-Engineering Dipl.-Ing. Marc Colling Schlossstrasse 50 66352 Karlsbrunn GERMANY phone : (+49) 6809 / 7020190 fax : (+49) 6809 / 7020191 mobile : (+49) 170 / 7780788 Marc.Colling@MaCo-Engineering.de www.MaCo-Engineering.de _______________________________________________ http://www.opencores.org/mailman/listinfo/pci
(no subject)
by Unknown on Mar 30, 2004 		Not available!
Hi STB,

it's not a matter of what kind of voltage the boards are using ...
It's a matter of the financial background you must have if your customers
get problems with your PCI product and find out that it is not PCI
compliant ...
So it makes sense to think about the 3.3/5V problem and care about the
standard.

Have Fun too

Marc


At 12:04 30.03.2004 +0200, you wrote:
Do you have a motherboard that use 5V environment??? It could not be an Intel or compatible board from this century. All(?) modern PCs use 3.3V signaling but they are still keyed as 5V. I have produced a PCI board based on Altera APEX EP20K400 (=3.3v) and it is working in a couple of hundred computers. It might not be according to the standard but it still works fine. Have Fun STB -----Ursprungligt meddelande----- Från: pci-bounces@opencores.org [mailto:pci-bounces@opencores.org] För Marc Colling Skickat: den 30 mars 2004 11:16 Till: Discussion list about free, open source PCI IP core Ämne: Re: [pci] (no subject) Hi, Look on the Altera Web-Site for the Application Note AN 330: Connecting Altera 3.3V PCI to 5V PCI Bus Marc At 16:52 30.03.2004 +0800, you wrote:
>hi,all > I'm using cyclone to implement pci interface in my project.But > cyclone only supports 3.3v pci io standard,if the motherboard only > provides 5v pci signaling environment then how to implement? > In the cyclone datasheet there is a example of driving a cyclone > device with a 5v device. >A external resistor is used and the internal PCI clamp diode is enabled.If >i have to do like that or use a pci level convter then another problem is >that the length of pci signal traces has very tough specification.so if i >use external resistors or level convters ,how should i calculate the >length of the signal traces? > > > Highly thankful to u and sorry for my poor english! > >liqiyue > > > > >_______________________________________________ >http://www.opencores.org/mailman/listinfo/pci
MaCo-Engineering Dipl.-Ing. Marc Colling Schlossstrasse 50 66352 Karlsbrunn GERMANY phone : (+49) 6809 / 7020190 fax : (+49) 6809 / 7020191 mobile : (+49) 170 / 7780788 Marc.Colling@MaCo-Engineering.de www.MaCo-Engineering.de _______________________________________________ http://www.opencores.org/mailman/listinfo/pci _______________________________________________ http://www.opencores.org/mailman/listinfo/pci
MaCo-Engineering Dipl.-Ing. Marc Colling Schlossstrasse 50 66352 Karlsbrunn GERMANY phone : (+49) 6809 / 7020190 fax : (+49) 6809 / 7020191 mobile : (+49) 170 / 7780788 Marc.Colling@MaCo-Engineering.de www.MaCo-Engineering.de
(no subject)
by Unknown on Mar 30, 2004 		Not available!
hi STB

Thank u very much for your suggestion!

Do you have a motherboard that use 5V environment??? It could not be an

Intel or compatible board from this century. All(?) modern PCs use 3.3V
signaling but they are still keyed as 5V.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Really?

Then i can connect the pci signal traces to the my cyclone device directly?

I have produced a PCI board based on Altera APEX EP20K400 (=3.3v) and it is working in a couple of hundred computers. It might not be according to the standard but it still works fine. Have Fun STB -----Ursprungligt meddelande----- Från: pci-bounces@opencores.org [mailto:pci-bounces@opencores.org] För Marc Colling Skickat: den 30 mars 2004 11:16 Till: Discussion list about free, open source PCI IP core Ämne: Re: [pci] (no subject) Hi, Look on the Altera Web-Site for the Application Note AN 330: Connecting Altera 3.3V PCI to 5V PCI Bus Marc At 16:52 30.03.2004 +0800, you wrote:
hi,all I'm using cyclone to implement pci interface in my project.But cyclone only supports 3.3v pci io standard,if the motherboard only provides 5v pci signaling environment then how to implement? In the cyclone datasheet there is a example of driving a cyclone device with a 5v device. A external resistor is used and the internal PCI clamp diode is enabled.If i have to do like that or use a pci level convter then another problem is that the length of pci signal traces has very tough specification.so if i use external resistors or level convters ,how should i calculate the length of the signal traces? Highly thankful to u and sorry for my poor english! liqiyue _______________________________________________ http://www.opencores.org/mailman/listinfo/pci
MaCo-Engineering Dipl.-Ing. Marc Colling Schlossstrasse 50 66352 Karlsbrunn GERMANY phone : (+49) 6809 / 7020190 fax : (+49) 6809 / 7020191 mobile : (+49) 170 / 7780788 Marc.Colling@MaCo-Engineering.de www.MaCo-Engineering.de _______________________________________________ http://www.opencores.org/mailman/listinfo/pci _______________________________________________ http://www.opencores.org/mailman/listinfo/pci



(no subject)
by Unknown on Mar 30, 2004 		Not available!
To STB:
I test several pci signals on my pc with a intel815ep motherboard.
Max Voh is 5v,and it seems to be 5v signaling.
Does the pci io standard implemented on motherboards vary from country
to country?
Do you have a motherboard that use 5V environment??? It could not be an Intel or compatible board from this century. All(?) modern PCs use 3.3V signaling but they are still keyed as 5V. I have produced a PCI board based on Altera APEX EP20K400 (=3.3v) and it is working in a couple of hundred computers. It might not be according to the standard but it still works fine. Have Fun STB -----Ursprungligt meddelande----- Från: pci-bounces@opencores.org [mailto:pci-bounces@opencores.org] För Marc Colling Skickat: den 30 mars 2004 11:16 Till: Discussion list about free, open source PCI IP core Ämne: Re: [pci] (no subject) Hi, Look on the Altera Web-Site for the Application Note AN 330: Connecting Altera 3.3V PCI to 5V PCI Bus Marc At 16:52 30.03.2004 +0800, you wrote:
hi,all I'm using cyclone to implement pci interface in my project.But cyclone only supports 3.3v pci io standard,if the motherboard only provides 5v pci signaling environment then how to implement? In the cyclone datasheet there is a example of driving a cyclone device with a 5v device. A external resistor is used and the internal PCI clamp diode is enabled.If i have to do like that or use a pci level convter then another problem is that the length of pci signal traces has very tough specification.so if i use external resistors or level convters ,how should i calculate the length of the signal traces? Highly thankful to u and sorry for my poor english! liqiyue _______________________________________________ http://www.opencores.org/mailman/listinfo/pci
MaCo-Engineering Dipl.-Ing. Marc Colling Schlossstrasse 50 66352 Karlsbrunn GERMANY phone : (+49) 6809 / 7020190 fax : (+49) 6809 / 7020191 mobile : (+49) 170 / 7780788 Marc.Colling@MaCo-Engineering.de www.MaCo-Engineering.de _______________________________________________ http://www.opencores.org/mailman/listinfo/pci _______________________________________________ http://www.opencores.org/mailman/listinfo/pci





(no subject)
by AustinFranklin on Mar 30, 2004 		AustinFranklin
Posts: 17
Joined: Sep 12, 2008
Last seen: Jan 26, 2021
All(?) modern PCs use 3.3V
signaling but they are still keyed as 5V.


That can NOT be true. A 5V keying requires 5V signaling, and a 3.3V keying
requires a 3.3V keying. They may supply 5V and 3.3V on the connector, but
that does not mean it is a different signaling environment than the
connector is keyed for. VIO will be correct for the connector.

Regards,

Austin


(no subject)
by Unknown on Mar 31, 2004 		Not available!
Take an oscilloscope and measure any signal on the bus. They got 3.3V levels. Please reply again when you have done that. Have Fun STB -----Ursprungligt meddelande----- Från: pci-bounces@opencores.org [mailto:pci-bounces@opencores.org] För Austin Franklin Skickat: den 30 mars 2004 16:24 Till: Discussion list about free,open source PCI IP core Ämne: RE: [pci] (no subject)
All(?) modern PCs use 3.3V
signaling but they are still keyed as 5V.
That can NOT be true. A 5V keying requires 5V signaling, and a 3.3V keying requires a 3.3V keying. They may supply 5V and 3.3V on the connector, but that does not mean it is a different signaling environment than the connector is keyed for. VIO will be correct for the connector. Regards, Austin _______________________________________________ http://www.opencores.org/mailman/listinfo/pci
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