Juha, OK, I looked at the layout, and the part number device, EP1S30, and did a search on the net, and came up with ALTERA STRATIX.
Yes, the LVDS is in fact controlled impedance, 100 ohm differential, or you could probably route individual lines at 50 ohm. It does appear that some of the Stratix devices have the required 100 ohm termination built in, but I am not sure about yours, and this may be good providing that you are using the Stradix device as the differential receiver, however if you are using it as the LVDS driver / transmitter, then you will probably have to provide your own termination at the other end of the line. The first thing that you might want to do is look at the following ALTERA links: Ap Note for High Speed Board Design: http://www.altera.com/literature/an/an075.pdf Using High Speed Differential I/O Interfaces in Stratix Devices: http://www.altera.com/literature/an/an202.pdf These should give you some idea of just what you need to do in terms of routing, at least in the LVDS area. I looked around for some real life pinout diagrams, and only found some fairly poor tables, which would take me forever to map out. The "mapping" in your sample layout doesn't look quite right (although possibly it is and I am just not looking at it correctly), but I don't have the time to go over it. Can you point me to some ALTERA maps or "pin out pictorals" if there are any? JaMi * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
