Multichannel frequency acquisition circuit with APB interface

Abstract

The invention discloses a multichannel frequency acquisition circuit with an APB interface.The multichannel frequency acquisition circuit comprises the APB interface which is integrated in an SoC system to form a universal IP module, an internal storage, a programmable counter/timekeeper, multiple independent catching modules and multiple corresponding FIFO modules used for storing catching moment time values.The storage address space of the on-chip SoC system is distributed for the internal storage.A microprocessor in the SoC system configures, reads and writes the internal storage through the APB interface, and processes received interrupt signals.The universal IP module in the SoC system is mainly used as the IP module with the APB interface, and the IP module is high in practicability, portability and universality.The multichannel frequency acquisition circuit is small in occupied area, capable of saving circuit cost, limited in use resource, simple and easy to obtain.The FIFO module which can store certain catching moment time information is internally designed, and it is prevented that a CPU can not respond to interruption in time to cover values of catching moment storage time information.

Description

technical field [0001] The invention relates to the field of microelectronics technology and the field of integrated circuit large-scale SoC systems, in particular to a multi-channel frequency acquisition interface IP module circuit in the SoC system. Background technique [0002] With the progress and development of large-scale SoC technology, there are more and more requirements for integrating multi-functional IP modules on a chip. Using a simple and general method to realize some functional requirements of an SoC system on a chip can save area and reduce the number of components on the circuit board. , Simple and easy to operate. [0003] Existing frequency acquisition circuit implementation technologies are all realized by hardware circuits built by components such as large resistors and capacitors on the PCB. The existing frequency acquisition systems based on hardware circuits implemented by resistors and capacitors are It has the characteristics of complex circuit, ...

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Problems solved by technology

[0005] In the patent "A Frequency and Phase Difference Acquisition Circuit", authorized publication number: CN2042214499U, a frequency and phase difference acquisition circuit composed of a single-chip microcomputer and an acquisition unit is proposed. The circuit contains large components such as resistors and capacitors. It is mainly applied to the circuit system on the PCB board, which cannot be integrated and applied to the SoC system. It is different from the frequency acquisition circuit proposed in this design.

[0006] In the paper "Multi-channel Frequency Acquisition System Based on VB and DLL Technology" (Authors: Ding Li, Jia Dangping), the multi-channel f

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