High-precision synchronous pulse counting circuit based on PCI

Abstract

The invention discloses a high-precision synchronous pulse counting circuit based on a PCI. The circuit comprises an input signal isolation module, an FPGA controller, an SDRAM, a bus interface module, a high-precision clock module and a power module, wherein a signal output from a tested device firstly enters the input signal isolation module to be isolated and conditioned, isolated and conditioned pulses of all channels are counted and frequency of the pulses is tested through the FPGA controller, pulse count values of the channels and pulse frequency values are cached in the SDRAM, cached data are transmitted to the bus interface module by the FPGA controller, and the bus interface module transmits measurement data to an upper computer to be displayed and stored; the high-precision clock module is used for providing a high-precision clock needed in the counting and frequency testing process of the FPGA controller; the power module is use for providing power needed in work for the modules.

Description

technical field [0001] The invention is a high-precision counting and frequency measuring card with isolation function based on PCI, PXI, PCIe, cPCI and ISA buses. The invention is suitable for the application of counting and frequency measuring functions in industrial sites. Background technique [0002] At present, the index functions of the multi-channel synchronous pulse counting and frequency measuring cards based on PCI bus technology are generally as follows: the counting channels are 8 to 32 channels in parallel, the number of counters is 32 bits, TTL level, and some have external trigger counting functions. In order to adapt to the use of various industrial environments, some acquisition boards also have digital output functions. Although the existing PCI bus-based counting cards in the market can meet most market needs, some requirements still cannot be met in some special industrial occasions. completely satisfied. For example, in the occasion of testing the pul...

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Problems solved by technology

The existing counting and frequency measuring cards in China cannot meet t

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