Arbitration method, system and storage medium for multiple master devices of apb bus

Abstract

The invention discloses an arbitration method, system and storage medium for multiple master devices of an APB bus. The method includes: when two APB master devices receive request instructions for accessing APB slave devices at the same time, obtain the access of the first APB master device Priority, the access priority of the second APB master device; compare the access priority of the first APB master device with the access priority of the second APB master device; if the access priority of the first APB master device is higher than that of the second APB master device The access priority of the APB master device allows the first APB master device to access the APB slave device, and stores the access information of the second APB master device. In the present invention, each APB master device can access the APB bus space at any time, and all accesses initiated by the APB master device can be completed, and the APB master device does not need to obtain access to the APB bus through additional operations before initiating access, which simplifies Access operations improve access efficiency.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to an arbitration method, system and storage medium for multiple master devices of an APB bus. Background technique [0002] In the APB bus system, if there are multiple APB master devices, a multiplexer MUX is generally used to select one of the APB master devices through system configuration or external selection signals on the chip, and the access initiated by the master device can be executed normally. , and other APB master devices that have not been selected stop initiating access; after the APB master device that is currently allowed to initiate access completes all accesses, if other APB master devices need to initiate access, it needs to be selected through system configuration or chip external selection signal , gate the APB master device that will initiate access, and stop other APB master devices from initiating access. [0003] In the scheme of using MUX, it is nec...

AI Technical Summary

Problems solved by technology

This method increases the complexity of multiple APB master devices accessing the APB bus space, and the switching access method is also cumbersome. If the switching is frequent, the overall access efficiency will be very low

When the MUX gates an APB master device, other APB master devices can only stop initiating access. Even if the selected APB master device does not initiate any access operations, other APB master devices cannot initiate any access, which reduces the APB bus The access efficiency of the system limits the function of the APB bus system with multiple APB master devices

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