System for controlling multiple paths of different-level reset signals based on bus

Abstract

The invention provides a system for controlling multiple paths of different level reset signals based on a bus. The system comprises a control unit and at least one expansion unit; each expansion unit is provided with a plurality of reset signal output interfaces; the control unit is connected with the expansion unit through a bus and is used for controlling the expansion unit to output a reset signal; and eacj expansion unit is connected with an external system through the reset signal output interface and is used for outputting the reset signal to the external system through the reset signal output interface under the control of the control unit, so that the external system is reset according to the reset signal. According to the invention, the control unit is connected with the plurality of expansion units through the bus, so that the output of multiple paths of different reset signals can be realized without occupying a plurality of IO interfaces of the control unit.

Description

technical field [0001] The invention relates to the field of port expansion, in particular to a system for controlling multiple reset signals with different levels based on a bus. Background technique [0002] With the gradual improvement of system integration, the number of external chips that need to be controlled in the system is increasing, and the reset of external chips that needs to be controlled is also increasing. The output of high and low levels is used to control the reset of other external chips. As the number of external chips to be controlled continues to increase, the number of I / O ports of the main processing chip is seriously insufficient. [0003] At present, in order to realize the expansion of the I / O port of the main processing chip, many expansion circuits are usually implemented by adding complex peripheral circuits, which not only increases the production cost, but also occupies a relatively large space on the PCB line. The circuit design is complic...

AI Technical Summary

Problems solved by technology

[0003] At present, in order to realize the expansion of the I / O port of the main processing chip, many expansion circuits are usually implemented by adding complex peripheral circuits, which not only increases the production cost, but also occupies a relatively large space on the PCB line. Complicates the circuit design, which is not conducive to the miniaturization of products

There may be some existing technologies that implement the expansion of the reset circuit by using a decoder. For example, using a 38 decoder to realize 3 GPIO ports to drive 8 reset signal outputs, but the expansion of the reset circuit using a decoder requires the use of the main processing chip. 3 GPIO ports, and the number of expansion is limited, only 8 bits can be expanded

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