PCI interface protocol based array expandable data collection system realized by adopting FPGA (field programmable gate array)

Abstract

The invention discloses a PCI interface protocol based array expandable data collection system realized by adopting an FPGA (field programmable gate array). The system comprises a plurality of identical analog signal collection boards. Each of the boards comprises a controller module, a multipath ADC module, a power supply module and a PCI bridging chip, wherein the controller module is composed of an FPGA chip and an SRAM chip, and used for controlling the sampling process, generating between-board bus signals and controlling caching and transmission of data; the multipath ADC module is composed of 64 paths of single-path ADC modules with the same structure, and used for converting analog signals into digital signals and transmitting the data to the controller module; the power supply module is composed of two identical power supply sub-modules, and used for providing stable and low-noise power for the chips; and the PCI bridging chip is used for realizing communication between the analog signal collection boards and an upper computer through a PCI bus. The PCI interface protocol based array expandable data collection system realizes sampling control of a multipath ADC and control of data flows by using the FPGA, and greatly increases the flexibility and the reliability of the design.

Description

technical field [0001] The invention relates to a multi-channel analog signal acquisition technology, in particular to the field of controlling multi-board and multi-channel ADC sampling by using FPGA. Background technique [0002] In sonar, radar and other systems, analog signal acquisition is a very critical part, and it is responsible for digitizing the signals received by transducers and antennas after being processed by analog front-ends. In multi-transducer or multi-antenna sonar and radar systems, multi-channel parallel sampling technology is limited by technical conditions such as scalability, sampling accuracy and transmission rate. It has always been an industry problem. [0003] The multi-channel signal acquisition in the prior art is mainly divided into the following types: [0004] 1. Single board multi-channel synchronous analog signal acquisition [0005] In the technology related to multi-channel analog signal acquisition, there is a design method that plac...

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Problems solved by technology

[0012] (2) The expansion board and the main board are only connected by simple control lines and data lines, and do not make full use of the existing bus in the system

[0013] (3) The interconnection signals between boards are too simple, limited to a few signals of the chip itself; simple single-ended lines have limited ability to transmit high-speed signals, and traditional solutions use high-speed clocks for synchronization between channels. If the two clock signals are not captured, the synchronization effect will be greatly reduced

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