DP83850CVF

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The DP83850CVF is a multi-purpose IC that offers highly integrated system-level solutions for Gigabit Ethernet Physical Layer applications. It is mainly used for Ethernet media access controllers (MACs) and physical coding sub layer (PCS) applications. It comprises of two distinct versions - the DP83850CVF and the DP83850CVF-LE. This article focuses on the DP83850CVF and its application fields and working principles.

Application Fields

The DP83850CVF is used in high-speed Ethernet applications such as Internet switching and routing, video conferencing, storage area networking, and Gigabit passive optical networking. It supports up to 1000 Mbps data transfer rate over four copper lines. The DP83850CVF can be used for a variety of Ethernet-related tasks such as:

• Transparent LAN services
• Virtual circuit switching
• Point-to-Point Protocol (PPP)
• Frame Relay
• Multi-protocol label switching (MPLS)
• 802.1x port-based access control
• One-byte port-based traffic policer

Working Principle

The DP83850CVF is a highly integrated single-chip solution for transmitting and receiving gigabit Ethernet signals. It consists of three main modules - an Ethernet MAC, a 1000BASE-TX physical coding sublayer (PCS) block and a 1000BASE-TX physical media attachment (PMA). The MAC is responsible for data packet formation, scrambling, and frame preamble generation. It also provides Ethernet frame header and trailer generation/validation, CRC generation/validation, and FCS generation.

The 1000BASE-TX PCS block handles the bit-level coding of the data packet and provides new functions such as edging and jitter support. It also provides a 4-bit scrambler for improved bit error rate (BER). The PMA is responsible for transmission and reception of data over four twisted-pair copper lines. It can also handle auto-negotiation to choose the best connection speed and automatic flow control of incoming data. It also provides two-pair and four-pair echo cancellation and crosstalk prevention features.

The DP83850CVF supports four standard Ethernet modes - 10BASE-T, 100BASE-TX, 1000BASE-T, and 1000BASE-X. It also supports standards-based IEEE 1588v2 clock synchronization and IEEE 802.3az Energy Efficient Ethernet (EEE). The DP83850CVF implements a number of advanced security features such as MAC address filtering, IEEE 802.1X port-based access control, one-byte port-based traffic policing, and support for IEEE 1588v2 clock synchronization.

The DP83850CVF is used in high-speed Ethernet applications for transmitting and receiving gigabit Ethernet signals. It consists of a MAC, a 1000BASE-TX PCS block, and a 1000BASE-TX PMA that cooperate to provide high-speed Ethernet connectivity. It supports a variety of Ethernet standards and advanced features such as MAC address filtering, IEEE 802.1X port-based access control, one-byte port-based traffic policing, IEEE 1588v2 clock synchronization, and IEEE 802.3az Energy Efficient Ethernet (EEE).

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