SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
The EMIF controller provides connectivity between the device and DDR2 type or DDR3 type of memories and manages data bus read/write accesses between external memories and the device subsystems which have access to the L3_MAIN interconnect and DMA capability too.
The EMIF features are introduced in Section 15.1.3 EMIF Overview of Section 15.1Memory Subsystem Overview.
The device includes two EMIF controllers. Each controller supports up to 2 GiB of SDRAM over one chip select. As a result the total physical available SDRAM space is 4 GiB. Figure 15-45 shows an overview of these EMIF controllers and also the connections to the other surrounding modules. As can be seen on Figure 15-45 the two EMIFs are not directly available on device pads. That is, they are not directly connected to the external SDRAMs. There are DDR PHYs and then DDR I/Os between each EMIF controller and external SDRAM. The EMIF controller, the DDR PHYs and the DDR I/Os work like a single unit to manage data exchanges to and from external memories. To achieve successful data transaction between an internal device initiator and external SDRAM all these three components must be used.