List of Registers

Table 62. Primary and Secondary Status Registers (Sheet 2 of 2)

The bits described in Table 62 reflect the status of the 21555 primary interface for the Primary Status register, and of the secondary interface for the Secondary Status register. W1TC indicates that writing a 1 to that bit clears the bit to 0. Writing a 0 has no effect.

 

Offsets

 

Primary Status

Secondary Status

 

 

 

 

 

 

 

 

Primary byte

 

07:06h

47:46h

 

 

 

 

 

 

 

 

Secondary byte

 

47:46h

07:06h

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bit

Name

R/W

Description

 

 

 

 

 

 

 

 

 

 

 

This bit is set to a 1 when all of the following are true:

 

 

 

 

• The 21555 is a master on the corresponding bus.

 

8

Data Parity

R/

PERR# is detected asserted for writes or a parity error is detected

 

for reads.

 

 

 

Detected

W1TC

 

 

 

 

 

 

 

Parity Error Response bit is set in the Primary or Secondary Command register.

 

 

 

Reset value is 0.

 

 

 

 

 

 

 

Indicates slowest response to a non configuration command on the

10:9

DEVSEL# timing

R

corresponding interface. Reads as 01b to indicate that the 21555

 

 

 

responds no slower than with medium timing.

 

 

 

 

 

Signaled Target

R/

This bit is set to a 1 when the 21555 is acting as a target on the

11

corresponding bus and returns a target abort to the initiator.

Abort

W1TC

 

Reset value is 0.

 

 

 

 

 

 

 

 

Received Target

R/

This bit is set to a 1 when the 21555 is acting as an initiator on the

12

corresponding bus and receives a target abort.

Abort

W1TC

 

Reset value is 0.

 

 

 

 

 

 

 

 

Received Master

R/

This bit is set to a 1 when the 21555 is acting as an initiator on the

13

corresponding bus and detects a master abort.

Abort

W1TC

 

Reset value is 0.

 

 

 

 

 

 

 

 

Signaled System

R/

This bit is set to a 1 when the 21555 has asserted SERR# on the

14

corresponding bus.

Error

W1TC

 

Reset value is 0.

 

 

 

 

 

 

 

 

Detected Parity

R/

This bit is set to a 1 when the 21555 detects an address or data parity

15

error on the corresponding interface.

Error

W1TC

 

Reset value is 0.

 

 

 

Table 63. Revision ID (Rev ID) Register

• Primary byte offset: 08h and 48h

• Secondary byte offset: 08h and 48h

Bit

Name

R/W

Description

 

 

 

 

7:0

Revision ID

R

This register indicates the revision number of this device. The initial revision

reads as 0. Subsequent revisions increment by 1.

 

 

 

 

 

 

 

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

151

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Image 151
Intel 21555 user manual Primary and Secondary Status Registers Sheet 2, Revision ID Rev ID 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.