MARVELL 88E1112CC2-NNC1C000 Gigabit Ethernet Transceiver Datasheet and Design Guide
The MARVELL 88E1112CC2-NNC1C000 is a highly integrated, single-port Gigabit Ethernet transceiver designed to provide a complete physical layer (PHY) solution for a wide range of networking applications. This device supports 10/100/1000 Mbps operation over copper and is engineered to meet the rigorous demands of enterprise hardware, network switches, routers, and embedded systems.
A core strength of the 88E1112 lies in its robust feature set and design flexibility. It incorporates a high-performance DSP-based architecture for both transmit and receive paths, ensuring superior signal integrity and extended reach over CAT 5 UTP cabling. Key functionalities include auto-negotiation and auto-cross-over (Auto-MDIX), which automatically select the highest possible link speed and detect the correct pinout, drastically simplifying installation and reducing support costs.
The device supports both Reduced Gigabit Media Independent Interface (RGMII) and Gigabit Media Independent Interface (GMII), offering designers flexibility in connecting to a variety of MACs (Media Access Controllers) and switch controllers. This interface versatility makes it a suitable choice for numerous platform designs. Furthermore, it features advanced power management capabilities, including support for Wake-on-LAN (WoL) and energy-detect power-down modes, which are critical for developing energy-efficient, "green" networking products.
From a design perspective, the accompanying guide is indispensable. It provides critical guidance on PCB layout and power supply decoupling, which are paramount for achieving optimal performance in the noisy environment of a high-speed digital system. Proper grounding schemes and the strategic placement of decoupling capacitors near the power pins are heavily emphasized to mitigate noise and ensure signal stability. The guide also details the recommended transformer module interface and the importance of impedance-matched differential pairs for the MDI (Media Dependent Interface) traces to minimize signal reflections.
For effective integration, the transceiver is controlled via a standard management interface (MDC/MDIO), allowing for register access to configure various operating parameters, monitor link status, and perform diagnostics. This programmability enables fine-tuning for specific application requirements.
ICGOOODFIND: The Marvell 88E1112CC2-NNC1C000 is a proven, highly flexible Gigabit Ethernet PHY solution. Its combination of advanced signal processing, multiple interface support, and comprehensive power management makes it an excellent choice for designers building reliable, high-performance, and energy-conscious network infrastructure.
Keywords: Gigabit Ethernet Transceiver, Auto-Negotiation, RGMII, Power Management, PCB Layout.
