Networking Silicon — GD82559ER

6.1.4100BASE-TX Collision Detection

100BASE-TX collisions in half duplex mode only are detected similarly to 10BASE-T collision detection, via simultaneous transmission and reception.

6.1.5100BASE-TX Link Integrity and Auto-Negotiation Solution

The 82559 Auto-Negotiation function automatically configures the device to the technology, media, and speed to operate with its link partner. Auto-Negotiation is widely described in IEEE specification 802.3u, clause 28. The PHY unit supports 10BASE-T half duplex, 10BASE-T full duplex, 100BASE-TX half duplex, and 100BASE-TX full duplex.

The PHY unit has two Physical Media Attachment (PMA) technologies with its link integrity function, 10BASE-T and 100BASE-TX.

6.1.5.1Link Integrity

In 100BASE-TX, the link integrity function is determined by a stable signal status coming from the TP-PMD block. Signal status is asserted when the PMD detects breaking squelch energy and the right bit error rate according to the ANSI specification.

6.1.5.2Auto-Negotiation

The PHY unit fully supports IEEE 802.3u, clause 28. The technology, 10BASE-T or 100BASE- TX, is determined by the Auto-Negotiation result.

Speed and duplex auto-select are functions of Auto-Negotiation. However, these parameters may be manually configured via the MII management interface (MDI registers).

6.1.6Auto 10/100 Mbps Speed Selection

The MAC may either allow the PHY unit to automatically select its operating speed or force the PHY into 10 Mbps or 100 Mbps mode. The Management Data Interface (MDI) can control the PHY unit speed mode.

The PHY unit auto-select function determines the operation speed of the media based on the link integrity pulses it receives. If no Fast Link Pulses (FLPs) are detected and Normal Link Pulses (NLPs) are detected, the PHY unit defaults to 10 Mbps operation. If the PHY unit detects a speed change, it dynamically changes its transmit clock and receive clock frequencies to the appropriate value. This change takes a maximum of five milliseconds.

6.210BASE-T Functionality

6.2.110BASE-T Transmit Clock Generation

The 20 MHz and 10 MHz clocks needed for 10BASE-T are synthesized from the external 25 MHz crystal or oscillator. The PHY unit provides the transmit clock and receive clock to the internal MAC at 2.5 MHz.

Datasheet

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Intel GD82559ER manual 10BASE-T Functionality, 4 100BASE-TX Collision Detection, Auto 10/100 Mbps Speed Selection
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GD82559ER specifications

The Intel GD82559ER is a highly regarded network interface controller (NIC) designed for use in various computing environments, primarily for stable connectivity in both desktop and server applications. Released as part of the 82559 family of Ethernet controllers, the GD82559ER features advanced technologies that enhance performance, reliability, and manageability.

One of the standout features of the 82559ER is its ability to support both 10/100 Mbps Ethernet. This dual capability allows the controller to operate in a wide range of network settings, making it adaptable to legacy systems while also providing support for modern Ethernet standards. This versatility is crucial for organizations looking to maintain operational effectiveness without the need for immediate upgrades to their existing infrastructure.

The GD82559ER employs a PCI interface, which allows it to connect with various devices and motherboards easily, making it a go-to choice for manufacturers aiming for integration in their systems. It also includes features like Auto-Negotiation, enabling the NIC to automatically detect and select the appropriate speed and duplex mode for optimal performance. This capability is essential in dynamic networking environments, where devices from various generations coexist.

Power management is another critical aspect of the GD82559ER. The controller supports advanced power-saving features like PCI Power Management, reducing energy consumption during low-usage periods. This not only contributes to lower operational costs but also aligns with modern eco-friendly initiatives in technology.

Additionally, the GD82559ER comes equipped with advanced diagnostics and monitoring capabilities. This enhances the network's manageability by allowing administrators to track performance metrics and diagnose issues effectively. Through its onboard diagnostics, the controller aids in ensuring a stable network connection, allowing for timely interventions when issues arise.

The controller is also designed with a robust architecture that supports various operating systems, facilitating a broad implementation across different platforms. As a result, the GD82559ER has become a reliable option for system builders and enterprises focused on building dependable networking solutions.

Overall, the Intel GD82559ER is a versatile, high-performance network interface controller that continues to serve as a foundational component for computer systems that require efficient, reliable networking capabilities. Its combination of technologies and features makes it a popular choice in diverse computing environments.
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