Networking Silicon — GD82559ER

8.Control/Status Registers

8.1LAN (Ethernet) Control/Status Registers

The 82559ER’s Control/Status Register (CSR) is illustrated in the figure below.

D31

Upper Word

D16

 

D15

Lower Word

D0

Offset

 

 

 

 

 

 

 

 

 

 

 

 

SCB Command Word

 

 

SCB Status Word

 

00H

 

 

 

 

 

 

 

 

 

 

 

 

System Control Block General Pointer

 

 

04H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PORT

 

 

 

 

08H

 

 

 

 

 

 

 

EEPROM Control Register

 

 

Flash Control Register

 

0CH

 

 

 

 

 

 

 

 

 

 

Management Data Interface (MDI) Control Register

 

 

10H

 

 

 

 

 

 

 

 

Receive Direct Memory Access Byte Count

 

 

14H

 

 

 

 

 

 

 

 

 

PMDR

 

 

Flow Control Register

 

 

Early Receive Int

18H

 

 

 

 

 

 

 

 

 

 

Reserved

 

 

General Status

 

General Control

1CH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reserved

 

 

 

 

20H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reserved

 

 

 

 

24H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reserved

 

 

 

 

28H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reserved

 

 

 

 

2CH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reserved

 

 

 

 

30H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reserved

 

 

 

 

34H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reserved

 

 

 

 

38H

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reserved

 

 

 

 

3CH

 

 

 

 

 

 

 

 

 

 

 

Figure 23. 82559ER Control/Status Register

NOTE: In Figure 23 above, SCB is defined as the System Control Block of the 82559ER, and PMDR is defined as the Power Management Driver Register.

SCB Status Word:

SCB Command Word:

SCB General Pointer:

PORT Interface:

The 82559ER places the status of its Command and Receive units and interrupt indications in this register for the CPU to read.

The CPU places commands for the Command and Receive units in this register. Interrupts are also acknowledged in this register.

The SCB General Pointer register points to various data structures in main memory depending on the current SCB Command word.

The PORT interface allows the CPU to reset the 82559ER, force the 82559ER to dump information to main memory, or perform an internal self test.

Flash Control Register:

EEPROM Control Register:

The Flash Control register allows the CPU to enable writes to an external Flash.

The EEPROM Control register allows the CPU to read and write to an external EEPROM.

Datasheet

57

Page 63
Image 63
Intel GD82559ER manual LAN Ethernet Control/Status Registers, D31, D16 D15 Lower Word Offset

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.