Because as some others have said they need other things added to the board. Its all good if you know what your doing and understand proper DDR3 design/ ethernet design / board routing etc....
On 10/27/2014 10:30 AM, Maxim Podbereznyy wrote: > > Guys! > The schematic is open and 100% valid! Problems begin when you start > modifying the default design. What's the point to ask about the > original design if you intend to add/remove things in it? If you route > ddr3 wrong then your device will not even start and you'll come to > this forum and begin blaming Gerald or other guys who say "it's OK". > Stay on the original Gerber files and clone bbb (why would you need > it??) without issues > > 27 Окт 2014 г. 19:35 пользователь "CEinTX" <[email protected] > <mailto:[email protected]>> написал: > > I agree with Travis. > I have built boards using the BBB as a base. Verify everything - > as you should if you're modifying the design. > You shouldn't assume that everything is correct - especially since > this is a port of the original design. > I also added a 2nd Ethernet port and made other modifications to > suit our project's needs. > It is not backward compatible to the BBB at this point > I opted for RMII for the ports - requires software changes - there > are posts on this. > We are still in the bring up of these boards - all is going well. > So do your homework, examine the design, double / triple check > everything and make it yours. > > Good Luck on your endeavor, > Matt > > On Monday, October 27, 2014 9:58:30 AM UTC-5, Travis Estep wrote: > > Although I have not built any boards from the files, I have > studied both the schematic and the PCB file extensively. I > have not found any errors in either of them. Although it needs > to be said that I am not the kind of engineer that Gerald and > his layout guy are. > > If you have an engineer who plans to modify the boards to fit > your project, he should be able to do a thorough check to see > if any errors exist. My suggestion is to run a small batch of > boards exactly as they are in the file. Verify they work. Then > make any changes you need to the design and run them again. > This will tell you if the problem already existed or if you > introduced the problem with your changes. That's the approach > I'm taking at this point, although I don't plan to make a > commercial product. I should have a small shipment of bare > boards in a couple of months. But I don't plan to do a true > end to end test. My hobby project only cares about a few core > functions. > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google > Groups "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, > send an email to [email protected] > <mailto:[email protected]>. > For more options, visit https://groups.google.com/d/optout. > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google > Groups "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send > an email to [email protected] > <mailto:[email protected]>. > For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
