VPD Support

15.2Writing VPD Information

A write can occur only to the last 2 Kb (256 bytes) of VPD Space. Valid VPD byte addresses for write operations are 17F:080h. To write VPD information from the serial ROM, the following steps must be taken:

1.The VPD data register is written with 4 bytes of data. Byte 0 contains the data to be written to the location referenced by the VPD byte address. The value in bytes 3:1 of the VPD Data register is written to successive byte locations in VPD space.

2.The VPD address and VPD Flag bits are written. This requires a write to bytes E7:E6h, where the low 9 bits carry the VPD byte address and bit 15 is a 1, indicating a write operation. The 21555 adds the VPD base address, 080h, to the VPD byte address to obtain the serial ROM address and perform a write of 4 bytes. The VPD address has no alignment requirements; it can start on any byte boundary.

3.The VPD Flag bit is polled. When the 21555 returns a 0, the write is complete.

When a write is attempted to a location in the first 1Kb of serial ROM space (address bits 8:7 is 00b), the 21555 does not perform the write operation and clears the flag bit immediately. When the VPD byte address is one of the last three byte locations in VPD space, the 21555 only completes those writes to the end of VPD space, that is, it performs either a 3-, 2-, or 1-byte write.

The 21555 tracks whether the serial ROM is enabled for writes. If the serial ROM is write disabled when a VPD write is attempted, the 21555 first automatically performs a write enable operation to the serial ROM. The 21555 does not automatically perform this operation for serial writes using the CSR mechanism.

The VPD Address and VPD Data registers should not be written while any other VPD, serial ROM, or parallel ROM (PROM) operation is taking place, otherwise results are unpredictable.

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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.
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