Espressif ESP32-Ethernet-Kit, Getting Started Manual

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Note
1. GPIO2 is used to enable external oscillator of the PHY.
2. GPIO0 is a source of 50 MHz reference clock for the PHY. The clock signal is first
inverted, to account for transmission line delay, and then supplied to the PHY.
3. To prevent affec ng the power-on state of GPIO0 by the clock output on the PHY side,
the PHY external oscillator is enabled using GPIO2 a er ESP32 is powered up.
4. The ESP32 pins GPIO16 and GPIO17 are not broken out to the ESP32-WROVER-B
module and therefore not available for use. If you need to use these pins, please solder a
module without SPIRAM memory inside, e.g. the ESP32-WROOM-32D or ESP32-SOLO-
1.
ESP32-WROVER-B IP101GRI UART JTAG GPIO Comments
IO26 RXD[1]
IO27 CRS_DV
IO14 TMS IO14
IO12 TDI IO12
IO13 RTS TCK IO13
IO15 CTS TDO IO15
IO2 IO2 See notes 1 and 3 below
IO0 REF_CLK See notes 2 and 3 below
IO4 nTRST IO4
IO16 IO16 (NC) See note 4 below
IO17 IO17 (NC) See note 4 below
IO5 Reset_N IO5
IO18 MDIO
IO19 TXD[0]
IO21 TX_EN
RXD0 RXD
TXD0 TXD
IO22 TXD[1]
IO23 MDC