Virtual addresses used by software are converted to physical addresses by the Central Processing Unit's (CPU's) memory management unit (MMU) before being sent to the system bus.
The MMU on PIC32MX devices with the MIPS® M4K® core perform the following translations:
- Fixed Mapping Translation (FMT) on KSEG0/KSEG1
- Physical Address = Virtual Address and 0x1FFFFFFF
Please refer to PIC32MX FRM Section 3. Memory Organization (DS61115F) for detailed coverage on the FMT.
Also, see chapter 6 of "See MIPS Run" for a good discussion on low-level memory management in MIPS® CPUs.