## Overview of the KSZ8563R The **KSZ8563R** is a highly integrated, IEEE 802.3 compliant networking device. It is a **3-port 10/100 Ethernet switch** designed for industrial and automotive applications. It features two 10/100Base-T/TX PHYs and one RMII/MII/RGMII interface for connection to a host processor or another switch. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Ports** | 3 total (2 Internal PHYs, 1 MAC interface) | | **Speed** | 10/100 Mbps | | **Host Interface** | RGMII / MII / RMII | | **Management** | I2C, SPI, or MIIM (MDIO/MDC) | | **Package** | 64-pin VQFN (8mm x 8mm) | | **Voltage Supply** | 1.8V, 2.5V, or 3.3V (variable I/O) | | **Power Consumption** | Ultra-low power with Wake-on-LAN (WoL) | --- ### 2. Major Electronic Components & Subsystems #### A. The Switch Fabric The heart of the KSZ8563R is a non-blocking wire-speed switch fabric. It handles: * **Address Lookup:** A table for 1024 MAC addresses. * **VLAN Support:** 802.1Q VLAN tagging (up to 128 active groups). * **QoS (Quality of Service):** 4-level priority queues for traffic shaping. #### B. Integrated PHYs (Ports 1 & 2) These are the Physical Layer transceivers that convert digital data into analog signals for the Ethernet cable. * **Auto-MDI/MDI-X:** Automatically detects and corrects crossover cables. * **Termination:** Includes internal termination resistors to reduce BoM (Bill of Materials) cost. #### C. Port 3 (MAC Interface) Unlike Ports 1 and 2, Port 3 is a digital-only interface used to link the switch to a **Microcontroller (MCU)** or **MPU**. It supports: * **RGMII:** Reduced Gigabit Media Independent Interface (running at 10/100 speeds). * **MII/RMII:** Standard legacy interfaces for lower-power MCUs. #### D. Time Stamping (PTP) The KSZ8563R supports **IEEE 1588v2 PTP** (Precision Time Protocol). This is critical for industrial automation (e.g., synchronized robotics) where millisecond-level timing accuracy is required. --- ### 3. Pin Configuration Categories | Pin Group | Description | | :--- | :--- | | **TX/RX +/-** | Differential pairs for Ethernet Port 1 and 2. | | **LED Pins** | Status indicators for Link, Activity, and Speed. | | **REFTXP/N** | Precision resistors needed for internal bias circuitry. | | **VDD / VDDIO** | Core logic voltage and I/O buffer voltage. | | **XTAL** | 25MHz crystal oscillator input for system clocking. | --- ### 4. Typical Application Circuit When designing a PCB for the KSZ8563R, several peripheral components are mandatory: 1. **Magnetics:** A 1:1 transformer (Discrete or MagJack) is required for isolation. 2. **Decoupling Capacitors:** 0.1µF and 1µF ceramic capacitors near every VDD pin to filter high-frequency noise. 3. **RBIAS Resistor:** A high-precision 12.1kΩ (1%) resistor is usually connected to the `REFTXP` pin to set internal currents. --- ### 5. Advanced Features * **DLR (Device Level Ring):** Hardware support for ring redundancy in industrial Ethernet. * **Energy Efficient Ethernet (EEE):** Reduces power during periods of low data activity. * **Diagnostics:** Built-in cable diagnostics to detect opens or shorts in the Ethernet line.