5 Serial Peripheral Interface (SPI)
The LAN8650/1 is designed to conform to the OPEN Alliance 10BASE‑T1x MAC‑PHY Serial Interface specification, Version 1.1. The IEEE Clause 4 MAC integration provides the low pin count standard SPI interface to any microcontroller therefore providing Ethernet functionality without requiring MAC integration within the microcontroller.
The LAN8650/1 operates as an SPI client supporting SCLK clock rates up to a maximum of 25 MHz. This SPI interface supports the transfer of both data (Ethernet frames) and control (register access).
| Pin Name | Description | Direction |
|---|---|---|
| SDI | Serial Data In | Input |
| SDO | Serial Data Out | Output |
| CS_N | Chip Select (active low) | Input |
| SCLK | Serial Clock | Input |
| IRQ_N | Interrupt Request (active low) | Output |