Espressif ESP32 Technical Reference Manual page 33

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1 System and Memory

• Peripherals accessed by the CPU via 0x3FF40000 ~ 0x3FF7FFFF address space (DPORT address) can

also be accessed via 0x60000000 ~ 0x6003FFFF (AHB address). (0x3FF40000 + n) address and

(0x60000000 + n) address access the same content, where n = 0 ~ 0x3FFFF.

• The CPU can access peripherals via DPORT address more efficiently than via AHB address. However,

DPORT address is characterized by speculative reads, which means it cannot guarantee that each read

is valid. In addition, DPORT address will upset the order of r/w operations on the bus to improve perfor-

mance, which may cause programs that have strict requirements on the r/w order to crash. On the other

hand, using AHB address to read FIFO registers will cause unpredictable errors. To address above issues

please strictly follow the instructions documented in

sections 3.3, 3.10, 3.16, and 3.17.

1.3.5.1 Asymmetric PID Controller Peripheral

There are two PID Controllers in the system. They serve the PRO_CPU and the APP_CPU, respectively. The

PRO_CPU and the APP_CPU can only access their own PID Controller and not that of their counterpart. Each

CPU uses the same memory range 0x3FF1_F000 ~ 3FF1_FFFF to access its own PID Controller.

Espressif Systems

Boundary Address

High Address

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