IO pin multiplexing circuit, control method, chip and electronic equipment

By using an I/O pin multiplexing circuit to write control words during chip startup and transmit digital signals during normal operation, the problems of pin resource consumption and speed bottleneck in existing technologies are solved, reducing hardware cost and complexity.

CN120934501APending Publication Date: 2025-11-11GUANGZHOU RUNXIN INFORMATION TECH CO LTD
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Patent Information

Application Number
CN202510977304.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-16
Publication Date
2025-11-11

AI Technical Summary

Technical Problem

Existing chip control word writing solutions have bottlenecks in pin resource consumption and speed. The SPI interface consumes a lot of pins, the I2C speed is insufficient, and GPIO parallel writing requires multiple pins, which increases hardware complexity and cost.

Method used

The circuit employs an IO pin multiplexing circuit and uses an enable signal switching function to realize control word writing during chip startup and digital signal transmission during normal operation, thereby reducing pin resource consumption. Function switching is achieved by using a gating module, a control word encoding module, and an ESD module in conjunction with enable signal switching.

Benefits of technology

Control word writing is implemented during chip startup, and digital signal transmission is implemented during normal operation, reducing hardware costs, pin resource consumption, writing speed, and reducing digital resources and chip area.

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Abstract

The invention discloses an IO pin multiplexing circuit, a control method, a chip and electronic equipment, and the circuit comprises a gating module which is connected with a chip core and is used for transmitting a first enabling signal and / or a second enabling signal according to an on-chip control signal; the control word coding module is respectively connected with the gating module and the off-chip, and is used for enabling an IO pin to work in a control word coding mode according to the first enable signal; the digital signal input module is respectively connected with the gating module and is used for enabling an IO pin to work in a digital signal input mode according to a second enable signal; and the ESD module is connected with the digital signal input module and the control word coding module and is used for providing electrostatic protection. According to the invention, a pin function multiplexing technology is adopted, a control word writing function can be realized when the chip is just started through an enable signal switching function, a digital signal transmission function can be realized when the chip normally runs, the hardware cost is reduced, and the consumption of pin resources is reduced.
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