Digital control interface device compatible with three-wire and four-wire SPI working forms simultaneously

Abstract

The invention discloses a digital control interface device compatible a three-wire and a four-wire SPI working forms simultaneously, including a SPI control module and a data buffer, wherein the SPI module controls readout and write operations of a RF chip internal register, and includes five I / O ports of a control clock input end, a control enable input end, a control data input end, a control data output end and a control data enable end; the data buffer includes an output buffer (201), an input buffer (202) and a control data enable line, an output from the control data output end of the SPI module is outputted by buffering of the output buffer (201), the control data input end of the SPI module is inputted by buffering of the input buffer (202), and the control data enable line controls the opening and the switchingoff of the output buffer (201) and the input buffer (202). By means of a simple configuration outside an IC chip, it is capable of controlling the inner of an radio frequency IC chip by a three-wire or four-wire forms.

Description

technical field [0001] The invention belongs to the technical field of a digital control interface for controlling a radio frequency integrated circuit chip by a communication baseband integrated circuit chip, and specifically refers to a digital control interface device compatible with three-wire and four-wire SPI working forms at the same time. . Background technique [0002] At present, in the communication system, the baseband digital chip needs to control and observe the internal registers of the radio frequency chip, and a common interface standard is required for communication between chips. In order to reduce the number of control lines in communication, simplify configuration difficulty, and realize short-distance high-speed communication between chips, the SPI (Serial Peripheral Interface--Serial Peripheral Interface) control interface is adopted. The transmission rate of the current SPI interface bus can reach more than tens of Mbps, and the SPI control interface...

AI Technical Summary

Problems solved by technology

Due to the variety of standards and interface timing, the SPI interface has different interface forms. For different chip interface forms, it is necessary to provide corresponding interface structure configurations. Therefore, its scalable configuration performance is low, which limits the scope of application of the interface.

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