POP package memory interface usage

Ted Michon said:

Does using a POP device containing NAND Flash and DDR RAM use both memory interfaces on the OMAP3530 CBB package? Specifically: Does this mean that on the Beagle board that both the GPMC interface and the SDRC interfaces are already committed so we cannot spin our own version with some aditional memory mapped interfaces in it?

Yes, the PoP device will be using the DDR interface and the GPMC interface to communicate with the DDR and flash in the PoP device. In general the SDRC is not able to drive two independent loads of DDR reliably so by using PoP you are limited to only the DDR that is in the PoP package. The GPMC on the other hand is a bit more flexible, you could have NAND flash in the PoP and some other device connected through the bottom side of the BGA, for example on the Mistral EVM there is PoP in use and an external Ethernet MAC on the GPMC.

Bernie-

Thanks for the response.

Your answer is particularly useful, since the additional memory mapped devices we want to add includes an Ethernet controller. We had focused on the Beagle Board to get our software going, but the fact that there is a board from Mistral that includes Ethernet is important.

-Ted