Esp32 spec 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。

start	end	size	usage	on-chip	usage
0x0000_0000	0x3F3F_FFFF		no use
0x3F40_0000	0x3F7F_FFFF	4M	data	ext	Flash or SRAM
0x3F80_0000	0x3FCBF_FFFF	4M	data	ext	Flash or 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 or SRAM
0x40C0_0000	0x4FFF_FFFF	244M	no use
0x5000_0000	0x5000_1FFF	8K	code/data	internal	RTC Slow Memory
0x5000_2000	0xFFFF_FFFF		no use