82515

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82515 is used as a programmable system interface chip, providing the capability to interface multiple address and data buses of mixed sizes and types to each other. Different combinations of data and address bus widths, speeds, and types can be interfaced with various memory map techniques. This device also contains a programmable dynamic bus sizing feature to expand and collapse the data and address buses as required. The 82515 is designed to meet the needs of demanding system interfacing and memory expansion/remapping applications. The 82515 is especially useful in applications that utilize a variety of different buses with memory management and interfacing requirements.

82515 Application Field

The 82515 is designed primarily to interface modern system bus designs with each other in order to maximize data throughput. It can be used to interface between systems featuring different type or widths of busses such as Peripheral Component Interface(PCI) buses, Enhanced Industry Standard Architecture (EISA) buses, Industry Standard Architecture (ISA) buses, and local bus designs. It can also be used to interface between Industry Standard Architecture (ISA) and Extended Industry Standard Architecture (EISA).

82515 Working Principle

The 82515\'s working principle is to increase the efficiency of data and address transfers by allowing different sized address and data busses to be connected to each other. The 82515 is designed to be used with a minimal number of logic components. The 82515 utilizes a programmable register load feature to set up the address space of the device. When the appropriate data and address bus sizes are input, the 82515 translates the selected address and data bus widths to the target bus in order to maximize data throughput. The 82515 contains two I/O ports which can be programmed to provide dynamic bus-sizing. By programming I/O port 0, the bus-sizing can be set up for data transfers while I/O port 1 is used for address bus-sizing. The 82515 also contains a programmable direct memory access (DMA) facility that allows the 82515 to access memory without utilizing the system bus.

The 82515 also contains a receiver and transmitter, which are used to provide a low-overhead data communication interface between a host microcontroller or processor and an attached 82515 device. This feature eliminates the need for an external interface unit, and reduces overall system cost and complexity. The 82515 transmitter can also transmit data to external devices by using either a data strobe or an acknowledge signal in order to control data transmission.

The 82515 also supports added features, such as the ability to detect system errors and provide an internal interrupt controller. This controller allows the 82515 to generate an interrupt when an error is detected in the system. The interrupt can then be routed to a microcontroller or DMA device for error handling. The 82515 can be used to interface between two or more system buses, and it has the ability to disable the output of one bus while it is still connected to the input of the other bus. This feature can be used to shield one system from noise or power surges from the other system.

The 82515 can also be used to interface between two or more system busses that have different data and address widths. This feature eliminates the need for external decoders and transceivers, and allows for increased data throughput. The 82515 can also be used to bridge between two or more devices on a single bus, allowing multiple devices to communicate, or for data to be routed to multiple busses. This feature can also be used to cascade multiple 82515 chips in order to increase the bus width while maintaining the same bus speed.

Overall, the 82515 is an ideal solution for situations needing high data throughput between multiple busses of mixed sizes and types, as well as situations requiring dynamic bus re-sizing and data bridge capabilities. This chip occupies a relatively small amount of board space, allowing for compact designs with maximum performance. The 82515 also offers excellent power-on reset features and power management features, making it well-suited for hot-swap systems.

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