Module for realizing SPI interface

Abstract

The invention discloses a module for realizing an SPI interface, comprising a baseband chip, at least one peripheral and a simulation switch, wherein the external bus interface of the baseband chip simulates a white-enable pin, an output-enable pin, a universal input pin, a universal output pin, a first data signal pin and a second data signal pin; the write-enable pin and the output-enable pin are respectively connected with the input end of the simulation switch, the output end of the simulation switch serving as the clock signal pin of a serial peripheral interface (SPI) is connected with the peripheral; the universal input pin and the universal output pin which serve as chip selection signal pins are respectively connected with the peripheral; and the first data signal pin and the second data signal pin respectively serving as a master out salve in (MOSI) pin and a master in slave out (MISO) pin are connected with the peripheral. The invention can enrich interface resources for a platform, enhances platform interface usability, saves mobile phone cost and improves PCB space utilization rate to a very large extent.

Description

technical field [0001] The invention relates to a circuit module, in particular to a module realizing an SPI interface. Background technique [0002] A peripheral control chip is usually used in the printed circuit board of an existing mobile phone to connect the baseband chip and the peripheral device. Traditional technical solutions such as figure 1 As shown, the traditional system framework needs to add a control chip with SPI interface (Serial Peripheral Interface) (in the dotted line box). The bridge between the baseband chip and the peripheral device is the peripheral control chip. Communication is performed on the SPI interface of the control chip, and then the baseband chip communicates with the peripheral control chip through the HOST interface (host interface), thereby completing the communication between the baseband chip and the peripheral equipment. [0003] Therefore, although the current technical implementation scheme can realize stable communication betwee...

AI Technical Summary

Problems solved by technology

[0003] Therefore, although the current technical implementation scheme can realize stable communication between peripheral equipment and the platform, thereby achieving system stability, the use of this technology requires the addition of a high-cost control chip with an SPI interface, which improves the The cost of the mobile phone BOM (bill of materials), and the additional control chip largely occupies the PCB board (printed circuit board) space layout, reducing the PCB space utilization rate

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