Intel 21152 manual Secondary Bus Arbitration

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Secondary Bus Arbitration

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This chapter describes the use of jumpers to test 21152 secondary bus arbitration, an optional programmable feature. For more detailed information about the 21152 arbiter, refer to the 21152 PCI-to-PCI Bridge Data Sheet.

The EB152 has two secondary bus arbiter systems:

•An internal arbiter implemented in the 21152 that supports four external masters in addition to the 21152

•An optional external arbiter implemented in an AMD MACH210A programmable device

The default setting is internal arbitration. The internal 21152 arbiter implements a 2-level programmable rotating mode algorithm. Secondary bus parking is done at the last master to use the bus.

The internal arbiter can be disabled, and an external arbiter can be used instead for secondary bus arbitration. The EB152 provides a socket for an optional PAL (labeled E3 in Figure 4-1) to control secondary bus arbitration. If a different external arbiter is used where parking is done at one of the PCI slots, a PCI device must be installed in that slot.To change the default, configure the secondary bus arbiter system using jumpers J7, W4, and W1.

Figure 4-1shows the location of the arbitration jumpers, and Table 4-1and Table 4-2describe their operation.

All jumper positions assume that the EB152 is positioned with the components facing forward and the card edge facing down.

21152 PCI-to-PCI Bridge Evaluation Board User’s Guide

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Contents PCI-to-PCI Bridge Evaluation Board PCI-to-PCI Bridge Evaluation Board User’s Guide Contents Tables FiguresFeatures IntroductionOverview EB152 Major Components Major ComponentsJumpers Secondary Slot Numbering and Idsel MappingJumper Connections EB152 with One Secondary Bus Option Card Typical ConfigurationsTri-Level with Two EB152s Page Software Requirements InstallationSpecifications Hardware RequirementsInstallation Procedure Interrupt ORing Interrupt RoutingInterrupts from Devices to EB152 Fingers Interrupt RoutingSecondary Bus Arbitration Internal Arbitration Jumper Positions Arbitration JumpersExternal PAL Arbitration Jumper Positions Page Kit Contents Page Http//developer.intel.com Support, Products, and Documentation

21152 specifications

The Intel 21152 is a highly regarded chip designed specifically for use in a variety of networking applications, including Ethernet and Token Ring networks. Introduced in the 1990s, this device played a critical role in advancing network communication technologies by providing high-performance data transfer capabilities and supporting various network protocols.

One of the main features of the Intel 21152 is its ability to handle dual 10BASE-T Ethernet ports, allowing for flexibility in network configurations. This dual-port capability is essential for implementing redundancy and load balancing in networking environments, ensuring that data can be transmitted efficiently even in the event of device failures. Furthermore, the chip is capable of supporting both full-duplex and half-duplex modes, accommodating different network setups and enhancing overall throughput.

The Intel 21152 utilizes a sophisticated architecture that integrates a range of technologies to optimize performance. It features a built-in microprocessor that enhances its processing capabilities, enabling it to manage data packets intelligently. Additionally, the chip supports a variety of networking standards such as IEEE 802.3, which ensures compatibility with a wide range of devices and systems in existing network infrastructures.

Another key characteristic of the Intel 21152 is its low power consumption, which was particularly notable for its time. This efficiency not only reduces operational costs but also contributes to the longevity of devices utilizing the chip, making it a practical choice for manufacturers seeking to create reliable networking equipment.

Moreover, the Intel 21152 supports several memory interfaces, allowing for the integration of external memory to further enhance its functionality. This capability is beneficial for applications requiring high-speed data buffering and processing.

In summary, the Intel 21152 emerged as a prominent networking chip with its dual-port support, efficient architecture, compatibility with various standards, and low power requirements. Its advanced features made it a valuable component in the development of networking solutions, solidifying its reputation in the industry and influencing the design of subsequent generations of network devices. With its significant technological advancements, the Intel 21152 paved the way for improved connectivity and communication in computing environments.
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