The **KSZ9563R** is a highly integrated, IEEE 802.3 compliant networking device manufactured by Microchip Technology. It is a **3-port Gigabit Ethernet Switch** designed for industrial and automotive applications where low power and high reliability are required. --- ## 1. Key Technical Specifications | Feature | Description | | :--- | :--- | | **Number of Ports** | 3 (2x 10/100/1000 Mbps PHYs + 1x RGMII/MII/RMII Interface) | | **Interface Type** | RGMII / MII / RMII (to Host CPU or FPGA) | | **Management Interface** | I2C, SPI, or MIIM (MDIO/MDC) | | **Voltage Supply** | 1.8V, 2.5V, or 3.3V I/O options | | **Package** | 64-pin VQFN (8mm x 8mm) | | **Standard Support** | IEEE 1588v2 PTP, Audio Video Bridging (AVB), TSN | --- ## 2. Core Functional Blocks ### A. The Switching Engine The heart of the KSZ9563R is a non-blocking switch fabric. It handles wire-speed switching for all ports simultaneously. It supports: * **VLAN Support:** IEEE 802.1Q VLAN tagging and port-based VLANs. * **QoS (Quality of Service):** 4-level priority queues per port to prioritize time-sensitive data. * **MAC Table:** Integrated address look-up engine with a 8K entry MAC address table. ### B. Integrated PHYs (Ports 1 & 2) Ports 1 and 2 contain integrated **10/100/1000BASE-T Transceivers**. These parts handle the physical signaling over copper twisted-pair cables. * **Auto-Negotiation:** Automatically matches speed and duplex mode. * **MDI/MDI-X:** Automatic crossover detection (no need for crossover cables). ### C. The MAC Port (Port 3) Port 3 does not have a physical copper interface. Instead, it provides a **MAC-to-MAC** or **MAC-to-PHY** interface (RGMII/MII/RMII). This is typically connected to: * An Application Processor (SoC). * An FPGA. * Another Ethernet switch to cascade ports. --- ## 3. Advanced Features ### Time-Sensitive Networking (TSN) & PTP The KSZ9563R is widely used in industrial automation because it supports **IEEE 1588v2 Precision Time Protocol (PTP)**. This allows the hardware to timestamp packets with nanosecond accuracy, enabling synchronized clocks across a network. ### Power Management The chip includes **Energy Efficient Ethernet (EEE)** and **Wake-on-LAN (WoL)**. It can enter low-power states when network traffic is absent, significantly reducing the thermal footprint of the PCB. --- ## 4. Typical Application Circuit When designing with the KSZ9563R, several external components are required: ```mermaid graph LR A[RJ45 Connector] --- B[Magnetic Transformer] B --- C[KSZ9563R Port 1/2] C --- D[25MHz Crystal/Oscillator] C --- E[SPI/I2C Control Bus] C --- F[RGMII Interface] F --- G[Main Processor/SoC] ``` * **Magnetics:** Requires external transformers (or MagJacks) for isolation. * **Clocking:** A 25MHz crystal or external clock source is mandatory. * **Decoupling:** Multiple capacitors (typically 0.1uF and 4.7uF) are needed for the VDD pins to filter high-frequency noise. ---