Address Decoding

4.3.2Direct Address Translation

With the exception of secondary bus transactions falling into the Upstream Memory 2 address

range (see Section 4.3.3) and all dual address transactions (Section 4.3.5), the 21555 uses direct address translation when forwarding memory transactions from one interface to the other. Note that since transactions addressing the bottom 4 KB of the Primary CSR and Downstream Memory 0 BAR are targeted at the 21555 CSRs, no forwarding and therefore no address translation is performed. Direct address translation is used for transactions in that range above the low 4 KB boundary.

A memory address may be thought of as a base address (as programmed in the Downstream and Upstream BARs) with an offset from the base address, as shown in Figure 4.

Figure 4. Address Format

Address Map

Offset

Base Address

Address

Base

Offset

 

 

A7462-01

When a memory transaction is forwarded downstream from the primary bus to the secondary bus, the primary bus address can be mapped to another address in the secondary bus domain. The mapping is performed by substituting a new base address for the base of the original address, as shown in Figure 5.

36

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

Page 35 Page 37
Page 36
Image 36
Intel 21555 user manual Direct Address Translation, Address Format
Page 35 Page 37

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.
Top Page Image Contents