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LAN8818D/KDX Datasheet(PDF) 8 Page - Microchip Technology |
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LAN8818D/KDX Datasheet(HTML) 8 Page - Microchip Technology |
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8 / 101 page  LAN8818D DS00005832C-page 8 © 2026 Microchip Technology Inc. and its subsidiaries 2.0 INTRODUCTION 2.1 General Description The LAN8818D is a low-power, quad-port triple-speed (10BASE-T/100BASE-TX/1000BASE-T) Ethernet physical layer transceiver (PHY) that supports transmission and reception of data on standard CAT-5, as well as CAT-5e and CAT-6, Unshielded Twisted Pair (UTP) cables. The LAN8818D supports industry-standard QSGMII (Quad Serial Gigabit Media Independent Interface) and Q-USGMII (Quad Universal Serial Gigabit Media Independent Interface) providing chip-to-chip connection to four Gigabit Ethernet MACs using a single serialized link (differential pair) in each direction. The LAN8818D supports high-accuracy timestamping functions to support IEEE-1588 solutions using Microchip Ether- net switches, as well as customer solutions based on SoCs and FPGAs. The LAN8818D also provides Synchronous Ethernet (SyncE) and TSN frame preemption support. The LAN8818D reduces board cost and simplifies board layout by using on-chip termination resistors for the line-facing differential pairs. The LAN8818D offers diagnostic features to facilitate system bring-up and debugging in production testing and in prod- uct deployment. The LinkMD TDR-based cable diagnostic identifies faulty copper cabling. Integrated loopback functions verify analog and digital data paths. The LAN8818D is available in a 100-pin, RoHS Compliant VQFN package with commercial (0 C to +70C) and industrial (-40 C to +85C) temperature ranges. An internal block diagram of the LAN8818D is shown in Figure 2-1. FIGURE 2-1: INTERNAL BLOCK DIAGRAM QSGMII / Q-USGMII Interface MDIO SyncE Clock Mux and Divider 1588 Timestamp Engine Ethernet Media Interface Port 0 GMII Predictor Signals, SOF GPHY Hard Macro Tx/Rx Rate Adaptation FIFOs TBI + PCH/MCH 1588 Timestamp Engine Ethernet Media Interface Port 1 GMII Predictor Signals, SOF GPHY Hard Macro Tx/Rx Rate Adaptation FIFOs TBI + PCH/MCH 1588 Timestamp Engine Ethernet Media Interface Port 2 GMII Predictor Signals, SOF GPHY Hard Macro Tx/Rx Rate Adaptation FIFOs TBI + PCH/MCH 1588 Timestamp Engine Ethernet Media Interface Port 3 GMII Predictor Signals, SOF GPHY Hard Macro Tx/Rx Rate Adaptation FIFOs TBI + PCH/MCH Chip Common Registers 1588 Common Functions 25M Ref Clk Reset GMII + PCH/MCH GMII + PCH/MCH GMII + PCH/MCH GMII + PCH/MCH GMII + PCH/MCH GMII + PCH/MCH GMII + PCH/MCH GMII + PCH/MCH PCS1G LEDs PCS1G LEDs PCS1G LEDs PCS1G 8 LEDs 4 Tx SOF 4 Rx SOF Analog Common Macro Digital Common Recovered Clock Input 1 Recovered Clock Input 2 1588 PLL Customer Temp Monitor LEDs 125M Ref Clk LAN8818D |
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