Terminal chip pin multiplexing device

Abstract

The invention discloses a terminal chip pin multiplexing device, comprising: a plurality of multiplexing control combination logic modules, which control the input signal of the corresponding multiplexing pin macro unit module by inputting an enabling control signal or outputting an enabling control signal or output signal; the multiplexing control module controls the switching of the outgoing signal of the functional module connected to the multiplexing pin and the signal of the general I / O interface module, as well as the direction of their signals; the general I / O interface module is used to determine the general The signal direction of the I / O interface module, the output CPU configuration level to the multiplexing pin, and the signal reading the multiplexing pin or the signal introduced into the functional module; and multiple multiplexing pin macro unit modules, each multiplexing pin The pin-using macro-unit modules all correspond to a multiplexed pin, and are used to input or output signals from the multiplexed pin according to the input enable signal or output enable signal from the corresponding multiplex control combinational logic module. The invention is beneficial to the expansion and connection of the chip external functions of the chip user.

Description

technical field [0001] The invention relates to the design of a terminal SOC (system on chip) chip or a mobile phone multimedia chip, in particular to a pin multiplexing device for a super large-scale chip. Background technique [0002] With the rapid development of microelectronics and communication technology, the integration scale of chips is getting larger and larger. Terminal SOC (system on chip) chip is a typical example. Early terminal chips may require multiple chips to complete the corresponding functions, but now a terminal SOC chip integrates all functions of the baseband, and also has rich multimedia and application functions. These terminal chips include mobile phone baseband chips, mobile phone application processors, terminal multimedia processors, and multimedia player SOC chips. [0003] With the rapid growth of application requirements, terminal chip integration functions are becoming more and more abundant, such as supporting multiple memory types, suppo...

AI Technical Summary

Problems solved by technology

[0017] The present invention aims to overcome the shortcomings of terminal SOC chips with many lead-out pins, high packaging cost, and large overall area of ​​the chip, and solve the problems of insufficient number of GPIOs and poor use flexibility existing in the prior art

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