A kind of ahb/apb expansion bus interface and system on chip

Abstract

The invention discloses an AHB / APB expansion bus interface and a system-on-chip, and the expansion bus interface comprises a plurality of bus connectors which are used for being connected with corresponding external equipment, and comprise external equipment controllers and at least one group of registers; an address decoder used for connecting the AHB / APB bus of the micro-control unit with the plurality of bus connectors, mapping peripheral address signals sent by the micro-control unit through the AHB / APB bus into register address signals of the corresponding bus connectors, and further sending the register address signals to the corresponding bus connectors; and a multiplexer used for connecting the AHB / APB bus with the plurality of bus connectors and establishing connection between theAHB / APB bus and the bus connector selected by the chip selection signal according to the chip selection signal sent by the micro-control unit through the AHB / APB bus so as to transmit a data signal.By means of the mode, the MCU kernel can extend more external devices, and the usability and the expandability of the MCU are improved.

Description

technical field [0001] The present application relates to the field of bus interface technology, in particular to an AHB / APB extended bus interface and a system on chip. Background technique [0002] AHB (Advanced High Performance Bus) bus and APB (Advanced Peripheral Bus) bus are a kind of AMBA (Advanced Microcontroller Bus Architecture, advanced microcontroller bus architecture), which is a standard based on Microcontroller Unit (MCU) ) on-chip bus structure. [0003] The AHB bus is mainly used for the connection between high-speed and high-performance modules, including single clock edge operation, non-three-state implementation, support for burst transmission, support for segment transmission, support for multiple master controllers, and support for bytes and nibbles And word transmission and other characteristics. The APB bus is mainly used for the connection between peripheral peripheral devices with low bandwidth, including two clock cycle transmission, infinite wai...

AI Technical Summary

Problems solved by technology

[0004] The traditional single-chip microcomputer based on the micro control unit is a processor chip designed by an application-specific integrated circuit. The AHB / APB bus interface and external devices are integrated inside the chip. It does not have the scalability of the AHB / APB bus interface and external devices. It is becoming more and more difficult Meet the needs of different external device application scenarios

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