Parallel and Serial ROM Connection, We# Oe#, Ce#

Parallel ROM Interface

8.2Parallel and Serial ROM Connection

Figure 14 shows how a parallel and serial ROM can be connected to the 21555. This figure illustrates the connection of a 16MB ROM. When a smaller ROM is used, the address registers corresponding to the upper address bits can be eliminated, as those upper address bits are ignored.

Figure 14. Parallel and Serial ROM Connections

21555

sr_cs

pr_ad[0]

pr_ad[1]

pr_ad[2]

pr_ad[7:0]

sr_cs Serial

sr_ck ROM sr_di

sr_do

d[7:0] Parallel

pr_wr_l
pr_rd_l
pr_ale_l
				en
				en
pr_clk				8-bit register
pr_clk

WE#

OE#

ROM

8-bit register

pr_cs_l

a[7:0]

a[15.8]

a[23:16]

CE#

A7491-01

8.3PROM Read by CSR Access

Byte reads of the PROM may be performed by CSR access of the ROM Control, Address, and Data registers. A byte read is performed as follows:

1.The initiator writes the byte address offset to the ROM Address register.

2.The initiator writes the PROM Start bit to a 1, Serial ROM Start bit to a 0, and the ROM Read/Write Control bit to a 0 in the Table 112, “ROM Control Register” on page 178.

3.When the initiator reads the PROM Start bit in the Table 112, “ROM Control Register” on page 178 as a 0, the ROM operation is complete and the initiator can obtain the read data from the ROM Data register.

84	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 Parallel and Serial ROM Connection, Prom Read by CSR Access, We# Oe#, Ce#

Models: 21555