List of Registers

Table 112. ROM Control Register (Sheet 2 of 2)

Byte Offsets: 0CFh

Bit

Name

R/W

Description

 

 

 

 

 

 

 

PROM read/write control bit. This bit may be written with the same

 

 

 

CSR access that sets the PROM Start bit.

 

Read/Write

 

• When 0, the 21555 performs a read of the PROM when the

2

R/W

PROM Start bit is set to a 1.

Control

 

 

• When 1, the 21555 performs a write of the PROM when the

 

 

 

 

 

 

PROM Start bit is set to a 1.

 

 

 

• Reset value is 0

 

 

 

 

 

 

 

This bit reflects the status of the serial ROM as a result of a polling

 

 

 

operation following a write all, erase all, write, or erase operation.

3

SROM_POLL

R

This bit is set automatically by the 21555 when one of these

operations is initiated, and cleared when a subsequent poll of the

 

 

 

 

 

 

serial ROM indicates that the operation is complete.

 

 

 

Reset value is 0

 

 

 

 

7:4

Reserved

R

Reserved. Reads only as 0.

 

 

 

 

16.10SROM Registers

This sections describes the SROM registers. See Chapter 9 for theory of operation information.

Table 113. Mode Setting Configuration Register (Sheet 1 of 2)

This register reflects the various mode settings selected by strapping the pr_ad pins, as well as whether the 64-bit extension is enabled.

Primary byte offset: D6h

Secondary byte offset: D6h

Bit

Name

R/W

Description

 

 

 

 

 

 

 

Indicates whether a serial preload was performed.

 

Serial

 

• When 0, the serial preload enable sequence was not detected and the

0

Preload

R

register preload was not performed.

 

Enabled

 

• When 1, the serial preload enable sequence was detected and the

 

 

 

 

 

 

register preload was performed.

 

 

 

 

 

 

 

Indicates the primary lockout reset value determined by sampling pr_ad[3]

 

Primary

 

during reset.

 

 

• When 0, signal pr_ad[3] was sampled low, causing the this bit to be low

1

Lockout

R

upon completion of chip reset.

 

Reset Value

 

 

 

• When 1, signal pr_ad[3] was sampled high, causing the this bit to be set

 

 

 

 

 

 

high upon completion of chip reset.

 

 

 

 

 

 

 

Indicates whether synchronous or asynchronous mode was selected by

 

Synchronous

 

sampling pr_ad[4] during reset.

2

R

• When 0, signal pr_ad[4] was sampled low, selecting synchronous mode.

Enable

 

 

• When 1, signal pr_ad[4] was sampled high, selecting asynchronous

 

 

 

 

 

 

mode.

 

 

 

 

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

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Intel 21555 user manual Srom Registers, ROM Control Register Sheet 2, Mode Setting Configuration Register Sheet 1, Srompoll

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.