ESP32-U4WDH embedded Flash and Eth LAN8720

giannifp
Posts: 2
Joined: Mon Jul 06, 2020 2:58 pm

ESP32-U4WDH embedded Flash and Eth LAN8720

Postby giannifp » Mon Jul 06, 2020 3:08 pm

Hello,
Trying to develop an application with ESP32-U4WDH instead of a ESP32-WROOM-32 module. The application will have a LAN8720 for wired Ethernet Connectivity. But I have not found anywhere in the datasheets where is the embedded flash connected to. Based on the ESP32-PICO, some of the EMAC interface is used by the embedded flash, for instance GPIO17. Is this the same case for the ESP32-U4WDH ?

Thanks in advance
Gianni

ESP_Peter
Posts: 13
Joined: Wed Mar 06, 2019 4:57 pm

Re: ESP32-U4WDH embedded Flash and Eth LAN8720

Postby ESP_Peter » Tue Jul 07, 2020 4:32 am

Please refer to following notes in "2.2 Pin Description " of ESP32 chip's datasheet.
The pin-pin mapping between ESP32-D2WD/ESP32-U4WDH and the embedded flash is as follows:
GPIO16 = CS#, GPIO17 = IO1/DO, SD_CMD = IO3/HOLD#, SD_CLK = CLK, SD_DATA_0 = IO2/WP#, SD_DATA_1 = IO0/DI. The pins used for embedded flash are not recommended for other uses.

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