MPU region address
| SUBREGION_DISABLE | This field is used to individually disabled the eight equally sized subregions in which a region is partitioned. Subregion disable: Bit 0: subregion 0 disable. Bit 1: subregion 1 disable. Bit 2: subregion 2 disable. Bit 3: subregion 3 disable. Bit 4: subregion 4 disable. Bit 5: subregion 5 disable. Bit 6: subregion 6 disable. Bit 7: subregion 7 disable. E.g., a 64 KByte address region (REGION_SIZE is ‘15’) has eight 8 KByte subregions. The access control as defined by PPU_REGION_ATT applies if the bus transfer address is within the address region AND the addressed subregion is NOT disabled. Note that the smallest region size is 256 B and the smallest subregion size is 32 B. |
| ADDR24 | This field specifies the most significant bits of the 32-bit address of an address region. The region size is defined by ATT.REGION_SIZE. A region of n Byte is always n Byte aligned. As a result, some of the lesser significant address bits of ADDR24 may be ignored in determining whether a bus transfer address is within an address region. E.g., a 64 KByte address region (REGION_SIZE is ‘15’) is 64 KByte aligned, and ADDR24[7:0] are ignored. |