W Disconnected, W Connected, 2a INS ENUM#

Initialization Requirements

When the INS_STAT bit is cleared, the card is ready for normal operation. When l_stat continues to be sampled low, that indicates that the ejector handle is closed (and the micro-switch is open), meaning the card remains fully inserted. The 21555 enters the Normal Operation state.

Figure 12. 21555 Hot-Swap Insertion and Removal

LOCAL_PCI_RST#

Asserted (anytime)

LOCAL_PCI_RST# asserted at any time and at any state puts the interface in State 0

Switch = Unlatched

0 H/W Disconnected

Board (and HS_CSR)

Invisible via PCI

LOCAL_PCI_RST# = Deasserted AND HEALTHY# = Asserted

1 H/W Connected

INS = 0 (Armed)

EXT = 0 (Not Armed)

LOO = Initially 0

LED = LOO

EIM = Initially 0

ENUM# = Z

Switch = Latched

2a INS ENUM#	Switch =	2b Extraction
	UnLatched

		INS = 1		INS = 1	DETECT
		EXT = 0 (Not Armed)		EXT = 0 (Armed)
		LOO = 1/ 0	Switch =	LOO = 1/ 0
		LED = LOO	Switch =	LED = LOO
		LED = LOO	Latched	LED = LOO
		EIM = 1/ 0	Latched	EIM = 1/ 0
		EIM = 1/ 0		EIM = 1/ 0
		ENUM# = EIM		ENUM# = EIM
	Software clears INS
Software		3 Installed		Software
clears EXT,		3 Installed		clears INS,
clears EXT,				clears INS,
ENUM# may	Switch = Latched	INS = 0 (Not Armed)		ENUM# may
go to Z	Switch = Latched	EXT = 0 (Armed)		go to Z
go to Z		EXT = 0 (Armed)		go to Z
momentarily.		LOO = 1/ 0		momentarily.
		LED = LOO
		EIM = 1/ 0
		ENUM# = Z
		Switch = Unlatched
4b Insertion	Switch =	4a EXT ENUM#
INS = 0 (Armed) DETECT	UnLatched	INS = 0 (Not Armed)
INS = 0 (Armed) DETECT		INS = 0 (Not Armed)
EXT = 1		EXT = 1
LOO =1/0	Switch =	LOO = 1/ 0
LED = LOO	Latched	LED = LOO
EIM = 1/0		EIM = 1/ 0
ENUM# = EIM		ENUM# = EIM
		Software clears EXT
		5 Extracted
		INS = 0 (Armed)	Switch = Unlatched
Switch = Latched		EXT = 0 (Not Armed)
Switch = Latched		LOO = 1/ 0
		LOO = 1/ 0
		LED = LOO
		EIM = 1/ 0
		ENUM# = Z

A8068-01

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 W Disconnected, W Connected, 2a INS ENUM#, 4b Insertion, 4a EXT ENUM#

Models: 21555

Initialization Requirements

Figure 12. 21555 Hot-Swap Insertion and Removal

LOCAL_PCI_RST#

0 H/W Disconnected

1 H/W Connected

2a INS ENUM#

2b Extraction

DETECT

3 Installed

4b Insertion

4a EXT ENUM#

5 Extracted

21555 specifications