Graham, Thanks so much! That should be enough to get me started. I wanted to avoid parts on the bottom of the board as it makes assembly more difficult. Board size isn't too much of a problem. The extra EEPROM programming step is a bit of pain but not impossible.
Thanks again! On Monday, August 5, 2019 at 6:30:13 PM UTC-5, Graham wrote: > > Steven: > The primary reason for parts on both sides of the boards is just space > constraint. > With an extra half square inch of space, everything could be on one side. > I do like to keep the transient suppressor as close to the RJ-45 > connector as possible. > You would still need a four layer board to do the power distribution > cleanly. > > In this design, the MAC address can not be assigned by the Linux driver. > It takes a Windows app, from the Microchip website, that needs to access > the LAN9500A > chip from both sides to program it. That is, it needs to access both the > USB-2 connection to the > LAN9500A, and have the Ethernet connection from the LAN9500A on the same > sub-net as the PC running the programming app. Even though the MAC address > is > held in an EEPROM, I don't think there would be any way for the user to > change it > without reproducing the programming connections. > > I am not aware that Microchip sells preprogrammed EEPROMS with the MAC > addresses, > normally you get blank EEPROMS and you supply and program the MAC > address. > Although for extra money, you can get either Microchip or some of the > distributors to program > memory parts. > > I have heard that Microchip will sell a small number of MAC addresses as a > courtesy, > but I have not done that. The normal process is to buy a block of MAC > assignments > from the IEEE which is the global coordinator. If you buy a large enough > block, you get > your own OUI. > > --- Graham > > == > > On Mon, Aug 5, 2019 at 3:21 PM Steven Keller <skelle...@gmail.com > <javascript:>> wrote: > >> Graham, >> If you don't mind could you answer a few questions? >> You have parts on both sides of the board. Is this primarily because of >> the size constraint or to keep traces short as possible? >> Is it possible for the driver software to load the MAC address of the >> Beagle Bone into the LAN9500A? It does not appear that the preprogrammed >> MAC address EEPROMs from Microchip work with these USB-to-Ethernet chips. >> >> -- 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 beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/86df597a-f542-4f96-b82e-35982fa3db38%40googlegroups.com.
