SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
Many register values are programmed with full-speed DDR clock cycles, whereas EMIF always runs at half the speed of this clock. Because EMIF is only capable of decrementing these values at half speed (taking into account the minus 1 programming model) the following model applies for data issued on a lower bus:
Activate and deactivate commands use the upper bus. Register values associated with these operations follow the general rule:
Shadow registers are loaded on any frequency change or SidleReq/SidleAck transition at the point where the EMIF has put SDRAM into self-refresh mode.
Table 17-103 summarizes the EMIF register mapping.