List of Registers

Table 69. Subsystem Vendor ID Register

• Primary byte offset: 2D:2Ch and 6D:6Ch

• Secondary byte offset: 6D:6Ch and 2D:2Ch

Bit

Name

R/W

Description

 

 

 

 

15:0

Subsystem

R/(WS)

Identifies the vendor of the add-in card or subsystem. This register is

Vendor ID

initialized by either the local processor or by serial ROM preload.

 

 

 

 

 

 

Table 70. Subsystem ID Register

• Primary byte offset: 2F:2Eh and 6F:6Eh

• Secondary byte offset: 6F:6Eh and 2F:2Eh

Bit

Name

R/W

Description

 

 

 

 

15:0

Subsystem

R/(WS)

Identifies the vendor-specific device ID for subsystem. This register is

ID

initialized by either the local processor or by serial ROM preload.

 

 

 

 

 

 

Table 71. Enhanced Capabilities Pointer Register

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Offsets

 

 

 

 

 

ECP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Primary byte

 

 

 

 

 

34h and 74h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Secondary byte

 

 

 

 

 

34h and 74h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

Name

R/W

Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pointer to the first set of ECP registers. Returns DCh to indicate that the first

 

7:0

 

ECP

R

set of ECP registers begins at configuration offset DCh. For the 21555, this

 

 

points to the Power Management registers.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset value is DCh

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pr

 

 

 

 

 

 

 

 

 

 

Table 72. Primary and Secondary Interrupt Line Registers

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Offsets

 

 

 

Primary Interrupt Line

Secondary Interrupt Line

 

 

 

 

 

 

 

 

 

 

 

 

Primary byte

 

 

 

3Ch

7Ch

 

 

 

 

 

 

 

 

 

 

 

 

Secondary byte

 

 

 

7Ch

3Ch

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

 

Name

 

R/W

 

 

Description

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This register is used to communicate interrupt line routing information for

 

 

 

 

 

 

 

 

 

the corresponding interface. This register must be initialized by

 

7:0

 

Interrupt Line

 

R/W

 

 

initialization code so a default state after reset assertion is not specified.

 

 

 

 

 

Initialization code writes this register with a value indicating to which input

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

of the system interrupt controller the 21555 bus interrupt signal pin INTA#

 

 

 

 

 

 

 

 

 

is connected.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

154

21555 Non-Transparent PCI-to-PCI Bridge User Manual

Page 154
Image 154
Intel 21555 user manual Subsystem Vendor ID Register, Subsystem ID Register, Enhanced Capabilities Pointer Register

21555 specifications

The Intel 21555 is a prominent microprocessor developed by Intel, designed to cater to a variety of computing needs. This processor marks a significant step forward in Intel's lineup and underscores the company's commitment to advancing technology in personal computing, enterprise solutions, and beyond.

One of the standout features of the Intel 21555 is its advanced architecture. It utilizes a multi-core design, enabling improved performance through parallel processing. This architecture allows multiple applications to run seamlessly without a decline in speed. The cores are built on a cutting-edge manufacturing process that enhances energy efficiency while maintaining high clock speeds.

The Intel 21555 supports a wide range of technologies, including Intel Turbo Boost, which enables dynamic adjustments to the processor’s performance based on workload demands. This feature allows the processor to accelerate its speed during intensive tasks, providing users with a responsive experience when it matters the most.

Another key characteristic of the Intel 21555 is its support for integrated graphics. With Intel UHD Graphics technology, users can enjoy enhanced visuals for everyday tasks such as video playback, web browsing, and light gaming. This eliminates the need for a separate graphics card for many users, particularly in home office or light gaming scenarios.

Security is a significant focus in the design of the Intel 21555. It includes built-in hardware-based security features like Intel Trusted Execution Technology and Secure Boot. These features help protect against various types of threats, ensuring that user data remains secure from malicious attacks.

The Intel 21555 is also optimized for use with Intel's platform technologies, including Intel Optane memory and Intel Rapid Storage Technology. These technologies work together to deliver faster boot times and improved system responsiveness, making computing more efficient for users.

Furthermore, the Intel 21555 is designed to support virtualization technologies, allowing multiple operating systems to run concurrently without compromising performance. This is particularly useful for developers and businesses that rely on virtualization for testing and development environments.

In summary, the Intel 21555 is a powerful and versatile processor that reflects Intel's ongoing innovation in the computing space. With its multi-core architecture, enhanced graphics capabilities, strong security features, and advanced technologies, it stands out as an excellent choice for a wide range of applications, serving both casual users and professionals alike.