Espressif ESP32 Technical Reference Manual page 622

Hide thumbs Also See for ESP32:

27 Memory Management and Protection Units (MMU, MPU)

Table 27-15. Virtual Address for External SRAM ( Normal Mode )

Virtual address

Virtual address

In Low-High mode, both the PRO_CPU and the APP_CPU use the same mapping entries. In this mode

is used for the lower 2 MB of the virtual address space, while

also means that the upper 64 MMU entries for

are unused. Table

Table 27-16. Virtual Address for External SRAM ( Low-High Mode )

Virtual address

In Even-Odd memory, the VRAM is split into 32-byte chunks. The even chunks are resolved through the MMU

, the odd chunks through the entries for

of physical memory. Table

Table 27-17. Virtual Address for External SRAM (Even-Odd Mode)

Virtual address

The bit configuration of the External RAM MMU entries is the same as for the flash memory: the entries are

32-bit registers, with the lower nine bits being used. Bits 0~7 contain the physical page the entry should map

its associate virtual page address to, while bit 8 is cleared when the entry is valid and set when it is not. Table

details the first MMU entry number for

Espressif Systems

details these address ranges.

are set to the same values, so that the virtual pages map to a contiguous region

details this mode.

Submit Documentation Feedback

PRO_CPU address

APP_CPU address

, as well as the lower 64 entries for

PRO_CPU/APP_CPU address

PRO_CPU/APP_CPU address

is used for the upper 2 MB. This

. Generally, the MMU entries for

for all PIDs.

ESP32 TRM (Version 5.2)

Need help?

Do you have a question about the ESP32 and is the answer not in the manual?