## Overview of the KSZ9563RNXI The **KSZ9563RNXI** is a highly integrated, IEEE 802.3 compliant networking device. It functions as a **3-port Gigabit Ethernet Switch**, featuring two integrated 10/100/1000 Mbps PHYs and one configurable RGMII/MII/RMII interface for host CPU connection. --- ### Core Specifications | Feature | Specification | | :--- | :--- | | **Ports** | 3 Ports (2x Internal PHY, 1x MAC Interface) | | **Speed** | 10/100/1000 Mbps (Gigabit) | | **Interface** | RGMII / MII / RMII | | **Management** | I2C, SPI, MIIM (MDIO) | | **Package** | 64-pin VQFN (8mm x 8mm) | | **Temperature** | Industrial Grade (-40°C to +85°C) | | **Voltage Supply** | 1.1V (Core), 1.8V/2.5V/3.3V (I/O) | --- ### Key Electronic Components & Internal Features The KSZ9563RNXI is designed for industrial automation, automotive, and IoT gateways. Below are its primary internal building blocks: #### 1. Integrated PHYs The device includes two copper transceivers that support: * **Auto-negotiation:** Automatic selection of highest common speed. * **Auto-MDI/MDI-X:** Eliminates the need for crossover cables. * **Energy Efficient Ethernet (EEE):** Reduces power consumption during low data activity. #### 2. Switch Fabric A non-blocking wire-speed switch fabric that manages: * **VLAN Support:** IEEE 802.1Q tag-based VLAN and port-based VLAN. * **QoS (Quality of Service):** Four priority queues per port for traffic prioritization. * **IGMP Snooping:** For efficient multicast packet delivery. #### 3. Time-Sensitive Networking (TSN) One of the standout features of this chip is its support for **IEEE 1588v2 PTP** (Precision Time Protocol). This allows for nanosecond-level synchronization across the network, making it ideal for synchronized industrial machinery. --- ### Typical Connection Diagram (Pin Functions) ```mermaid graph LR A[RJ45 Port 1] --- B[KSZ9563 Internal PHY 1] C[RJ45 Port 2] --- D[KSZ9563 Internal PHY 2] E[Host CPU/SoC] -- RGMII/MII --- F[KSZ9563 Port 3 MAC] G[I2C/SPI] -- Control --- F ``` --- ### Power Requirements To function correctly, the KSZ9563RNXI requires three distinct power rails: 1. **VDDL (1.1V):** Powers the internal digital core. 2. **VDDAT (1.1V):** Powers the internal analog blocks. 3. **VDDIO (1.8V/2.5V/3.3V):** Powers the I/O pins, allowing it to interface with different logic levels of various microcontrollers.