On 21.11.2019, the document "ESP32 Technical Reference Manual. A compendium of knowledge about the ESP32 architecture.
Link: https://www.espressif.com/sites/default/files...ation/esp32_technical_reference_manual_en.pdf
Link: https://www.espressif.com/sites/default/files...ation/esp32_technical_reference_manual_en.pdf