Sink0
Full Member level 6
- Joined
- Nov 25, 2009
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Sink0 said:Hi, i need to make a PCI board with a Cyclone II FPGA so i was taking a look on others board designs. I found 2 different boards, one at opencores and the second one is Dragon PCI FPGA board from knjn (http://www.knjn.com/FPGA-PCI.html). Looking at both i see that the PCI connector of both boards says that they can work with 5v and 3.3v but they do not have any voltage conversion between FPGA pins and PCI bus. How is that possible? How you can make sure that the PCI bus is going to talk at 3.3V and not at 5v?
I do not have the knjn board schematic but at the opencores one the Banks were powered with 3.3V.
Thank you!
Let me know if i was not enough clear.
Sink0 said:What buffer IC do you guys use? IDTQS3861 + Level shifting diode?
Thank you
Sink0 said:Hmmm maybe you can save me!!.. I have available 10 SN74CBTD3384PW.. But they footprint it look unusable.. How you did route with it? CBTD3861 and QS3861 looks so much easier to use as the bus com from one side and go out at the other of the IC. Not at the same side as 3384. Is it possible to give me a print of you routing with these ICSs? And it is a total of 22 ports.. 10 of eac 3384 and 2 from 3306. For PCI i supose you need something like 50 ports... how you did it?
Dont you have any spare board for sell at a good price right? haha
Thank you very much!!
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