查看Esp32 spec的源代码 Esp32 spec 0

2x Xtensa LX6 CPU.
两个CPU 的名称分别是“PRO_CPU”和“APP_CPU”。PRO 代表“protocol（协议）”，APP 代表“application
（应用）”。在大多数情况下，两个CPU 的功能是相同的。

{| class="wikitable" style="width:75%"
! start     !! end           !! size !! usage !! on-chip  !! usage
|- 
! 0x0000_0000     !! 0x3F3F_FFFF           !!   !!no use !! !!   
|-  
|| 0x3F40_0000|| 0x3F7F_FFFF || 4M || data || ext || Flash
|-  
|| 0x3F80_0000|| 0x3FCBF_FFFF || 4M || data || ext || SRAM
|-  
! 0x3FC0_0000!! 0x3FEF_FFFF !! 3M !! no use!! !!
|-
|| 0x3FF0_0000|| 0x3FF7_FFFF || 512K || data || I/O || 
|-
|| 0x3FF8_0000|| 0x3FF8_1FFF || 8K || data || internal ||RTC Fast Memory (PRO_CPU only)
|-
! 0x3FF8_2000!! 0x3FF8_FFFF !! 56K !! no use !! !!
|-
|| 0x3FF9_0000|| 0x3FF9_FFFF || 64K || data || Internal || ROM 1
|-
! 0x3FFA_0000!! 0x3FFA_DFFF !! 56K !! no use!!  !!
|-
|| 0x3FFA_E000|| 0x3FFD_FFFF || 200K || data || Internal ||SRAM 2 (DMA)
|-
|| 0x3FFE_0000|| 0x3FFF_FFFF || 128K || data || Internal ||SRAM 1 (DMA)
|-

|| 0x4000_0000|| 0x4005_FFFF || 384K || code || Internal || ROM 0
|-
! 0x4006_0000 !! 0x4006_FFFF !! 64K !! no use !! !!
|-
|| 0x4007_0000|| 0x400A_FFFF || 192K || code || internal ||SRAM 0  (64KB cache)
|-
|| 0x400A_0000|| 0x400A_FFFF || 128K || code || internal ||SRAM 1
|-
|| 0x400C_0000|| 0x400C_1FFF || 8K || code || internal || RTC fast Memory (PRO_CPU only)
|-
|| 0x400C_2000|| 0x40BF_FFFF || 11512K || code || ext || flash
|-
! 0x40C0_0000!! 0x4FFF_FFFF !! 244M !! no use!! !!
|-
|| 0x5000_0000|| 0x5000_1FFF || 8K || code/data || internal ||RTC Slow Memory
|-
! 0x5000_2000!! 0xFFFF_FFFF !!  !! no use!! !!
|-
|}

DMA:
 UART0,1,2
 SPI1,2,3
 I2S0,1
 SDIO slave, SDMMC
 EMAC
 BT
 WIFI

Peripharels: 41 device
 control registers 0x3FF0_0000~ 0x3FF7_FFFF, each device use 4KB space.
 系统中有两个PID Controller 分别服务于PRO_CPU 和APP_CPU。
 CPU 不能访问对方的PID Controller

Interrupt:
 71 external sources: 71 个外部中断源中有67 个可以分配给两个CPU。其余的4 个外部中断源只能分配给特定的CPU，每个CPU 2 个。
 26 interrupt source for each core.
 each CPU has 32x interrupt, include 26x external interrupt.
   internal interrupt: (6/7/11/15/16/29)
      timer0/1/2, software, 

Reset:
COU reset: 只复位CPU 的所有寄存器。(CPU)
Core reset: 除了RTC，会把整个digital 的寄存器全部复位，包括CPU、所有外设和数字GPIO。 (CPU+WIFI+BT+PERI+Digital GPIO)
system rest: 会复位整个芯片所有的寄存器，包括RTC (PMG+Sensor+ULP+RTC GPIO)。