Networking Silicon — GD82559ER

Note: Bit 3 is set to 1b only if the value 00001000b (8H) is written to this register, and bit 4 is set to 1b only if the value of 00010000b (16H) is written to this register. All other bits are read only and will return a value of 0b on read.

This register is expected to be written by the BIOS and the 82559ER driver should not write to it.

7.1.7PCI Latency Timer

The Latency Timer register is a byte wide register. When the 82559ER is acting as a bus master, this register defines the amount of time, in PCI clock cycles, that it may own the bus.

7.1.8PCI Header Type

The Header Type register is a byte read only register. It is hard-coded to equal to 00h for a single function card.

7.1.9PCI Base Address Registers

One of the most important functions for enabling superior configurability and ease of use is the ability to relocate PCI devices in address spaces. The 82559ER contains three types of Base Address Registers (BARs). Two are used for memory mapped resources, and one is used for I/O mapping. Each register is 32 bits wide. The least significant bit in the BAR determines whether it represents a memory or I/O space. The figures below show the layout of a BAR for both memory and I/O mapping. After determining this information, power-up software can map the memory and I/O controllers into available locations and proceed with system boot. To do this mapping in a device independent manner, the base registers for this mapping are placed in the predefined header portion of configuration space. Device drivers can then access this configuration space to determine the mapping of a particular device.

31

4 3 2 1 0

Base Address

 

 

 

0

 

 

 

 

 

Prefetchable

Set to 0b in 82559ER

Type

00- locate anywhere in 32-bit address space

01- locate below 1 Mbyte

10- locate anywhere in 64-bit address space

11- reserved

Memory space indicator

Figure 21. Base Address Register for Memory Mapping

Datasheet

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Intel GD82559ER manual PCI Latency Timer, PCI Header Type, PCI Base Address Registers
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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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