Architectural Overview, Data Buffers, Registers

Introduction

2.2Architectural Overview

This section describes the buffers, registers, and control logic of the 21555:

2.2.1Data Buffers

Data buffers include the buffers along with the associated data path control logic. Delayed transaction buffers contain the compare functionality for completing delayed transactions. The blocks also contain the watchdog timers associated with the buffers. The data buffers are as follows:

•Four-entry downstream delayed transaction buffer.

•Four-entry upstream delayed transaction buffer.

•256-byte downstream posted write buffer.

•256-byte upstream posted write buffer.

•256-byte downstream read data buffer.

•256-byte upstream read data buffer.

•Two downstream I20 delayed transaction entries.

2.2.2Registers

The following register blocks also contain address decode and translation logic, I20 message unit, and interrupt control logic:

•Primary interface header Type 0 configuration registers.

•Secondary interface header Type 0 configuration registers.

•Device-specific configuration registers.

•Memory and I/O mapped control and status registers.

2.2.3Control Logic

•The 21555 has the following control logic:

•Primary PCI target control logic.

•Primary PCI master control logic.

•Secondary PCI target control logic.

•Secondary PCI master control logic.

•ROM interface control logic for both serial and parallel ROM connections (interfaces between the ROM registers and ROM signals).

•Secondary PCI bus arbiter interface to secondary bus device request and grant lines, as well as the 21555 secondary master control logic.

•JTAG control logic.

18	21555 Non-Transparent PCI-to-PCI Bridge User Manual

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.

Intel 21555 user manual Architectural Overview, Data Buffers, Registers, Control Logic

Models: 21555