Extensible multichannel parallel real-time data acquisition device and method

Abstract

The invention discloses an extensible multichannel parallel real-time data acquisition device and method. The device comprises a PXIe (PCI (Peripheral Component Interconnect) Extensions for Instrumentation Express) backboard, a CPU (Central Processing Unit) board card and a plurality of FPGA (Field-Programmable Gate Array) acquisition cards; the PXIe backboard comprises a CPU motherboard slot, a clock board slot, a plurality of FPGA board card slots and a PCIe (Peripheral Component Interface Express) / PCI switching bridge; the data transmission between the CPU board card and the FPGA acquisition cards is achieved by PCIe switches, and the P2P (Peer-to-Peer) data transmission is carried out among the FPGA acquisition cards; a clock module provides a system differential clock, differential synchronization signals and differential star-shaped triggers through a clock bus and is downwardly compatible with a PXI clock; and the FPGA board card slots realize the compatibility between a PXI and a Compact PCIe board card through a PCI bus and the PCIe / PCI switching bridge. The invention further provides the method based on the device. The device and the method have the advantages of high sampling rate, fast data transmission and easiness for the large-scale extension of a plurality of board cards.

Description

technical field [0001] The invention relates to the research field of data acquisition devices, in particular to an expandable multi-channel parallel real-time data acquisition device and method. Background technique [0002] With the development of modern medical imaging technology, the requirements for the speed and accuracy of obtaining patient pathological information are getting higher and higher. At present, the main method to solve this problem is to use multiple detectors on the imaging equipment, sometimes even hundreds of detectors. Several detectors receive pathological signals at the same time, which requires a large-scale data processing system capable of real-time and parallel processing of the data received by these hundreds of detectors. However, limited by the high-speed layout process and data processing scale, it is currently impossible to transmit the data received by these hundreds of detectors to one acquisition board for processing. The common practice...

AI Technical Summary

Problems solved by technology

But there are still some deficiencies: 1. The system clock is designed on the acquisition board, the phase error of each channel on a single board is small, but if the expansion of multiple boards is done, the clock error between each board is relatively large, Unable to meet the synchronous parallel processing requirements of large-scale multi-channel signals

2. Use a dedicated DSP processor to realize its signal processing capability, and the dual processors form a ping-pong working mode, which increases the hardware cost and the difficulty of layout

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