SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
From the system point of view, the external SDRAM is seen as one block of SDRAM. If two external 64-MiB devices are used, a 128-MiB memory block is observed. If two external 32-MiB devices are used, a 64-MiB block is observed.
Table 17-84 shows the SDRAM address space.
Module Name | Base Address | Size |
---|---|---|
EMIF1 | EMIF2-CS0-SDRAM(1) | 0x8000 0000 | 0 to 1GiB, programmable in DMM (see Section 17.2, Dynamic Memory Manager) |
When addressing SDRAM, if the EMIF_SDRAM_CONFIG[28:27] IBANK_POS bit field is set to 0, the EMIF uses the following two bit fields to determine the mapping from the source address to the SDRAM row, column and bank:
If the EMIF_SDRAM_CONFIG[28:27] IBANK_POS bit field is set to 1, 2, or 3, the EMIF uses the following three bit fields to determine the mapping from the source address to the SDRAM row, column and bank:
In all cases the EMIF considers its SDRAM address space to be a single logical block, regardless of the number of physical devices.