Optional Configurations

In the other configuration, the central function is controlled by the intelligent subsystem through the J1 connector.

Table 12. External Arbiter Switch Option

Switch

Switch

Switch Down

Switch Up

Description

Pack

 

 

 

 

 

 

 

 

 

J20

SW5

Enable the 21555

System slot (J102) as

Central Function Mode(pr_ad<6>)

as central arbiter

Central Function

 

 

 

 

 

 

 

 

J21

SW1

Disable the 21555

System slot (J102) as

Disable 21555 arbiter.

as central arbiter

external arbiter.

 

 

 

 

 

 

 

 

Table 13 shows how the req# and gnt # lines must be configured for PICMG operation.

Table 13. J21 Switch Operations for Central Function and Arbiter Control

Switch

Switch

Request/

Switch Down

Switch Up

Pack

Grant

System slot (J102) as arbiter

21555 as arbiter

 

 

 

 

 

 

 

SW2

req#0

PICMG GNT becomes slot grant

req=req

 

 

 

 

 

J21

SW3

gnt#0

PICMG REQ becomes slot grant

gnt=gnt

 

 

 

 

SW4

req#1

REQ1 from PICMG slot

REQ1 from drawbridge

 

 

 

 

 

 

 

SW5

gnt#1

GNT1 from PICMG slot

GNT1 from drawbridge

 

 

 

 

 

3.3Asynchronous Clocking

Table 14 shows how to configure the J20 switches for synchronous or asynchronous operations of the local bus. If the PICMG slot is the source of the clocks, the resistor strapping options must be followed as described in Section 3.1. In addition, J20 SW3 must be set for asynchronous clocking and s_clk_o needs to be disabled from the 21555.

Table 14. Switch Operations for Synchronous or Asynchronous Clock Control

Switch

Switch

Switch Down

Switch Up

Description

Pack

 

 

 

 

 

 

 

 

 

 

 

Synchronous host and

Asynchronous host and

Selects synchronous or

 

SW3

asynchronous operation.

 

local clock domains

local clock domains

 

 

(pr_ad<4>)

J20

 

 

 

 

 

 

 

 

SW4

Disable 21555 (s_clk_o)

Enable 21555 (s_clk_o)

s_clk_o

 

(pr_ad<5>)

 

 

 

 

 

 

 

 

 

22

21555 PCI-to-PCI Bridge Evaluation Board User’s Guide

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Intel 21555 manual Asynchronous Clocking, External Arbiter Switch Option, Switch Switch Down Switch Up Description Pack

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.