SPRUI30H November 2015 – May 2024 DRA745 , DRA746 , DRA750 , DRA756
Table 15-18 lists the ratio of effective data-to-transferred data at the external memory interface for the buffered raster-based initiators in each mode and orientation when using a 32-bit DDR2 or DDR3 memory.
0- or 180-Degree Orientation (S = 0) | 90- or 270-Degree Orientation (S = 1) | |||
---|---|---|---|---|
Progressive | Interlaced | Progressive | Interlaced | |
8-bit mode | 100% | 50% | 100% | 50% |
16-bit mode | 100% | 50% | 100% | 50% |
32-bit mode | 100% | 50% | 100% | 50% |
Page mode | 100% | N/A | 100% | 100% |
When using 32-bit DDR2 or DDR3 SDRAMs, whenever all previous guidelines are fulfilled, there is no penalty for these initiators to access a tiled object in any orientation, except for accesses to an interlaced frame in any orientation where the memory bandwidth is twice the requested bandwidth.
When using DDR2 or DDR3 SDRAMs, all accesses, except interlaced accesses, are equally efficient and offer the full possible memory bandwidth.
Similarly, page mode does not introduce any performance hit.