CN203773270U - FPGA-based multipath data collector of X ray detection equipment - Google Patents

Abstract

The utility model provides an FPGA-based multipath data collector of X ray detection equipment. The collector comprises 2 to 16 data collection paths which collect signals of the signal output end of the X ray detection equipment, each data collection path comprises one path of analog output signals of the X ray detection equipment and an AD conversion unit correspondingly connected to the analog output signals, the output of the AD conversion unit is connected to a corresponding FIFO storage unit controlled by an FPGA, a multipath data gating unit and a data transmission unit of the FPGA output data in the FIFO to a multipath gating device, and on/off of the multipath gating device is sequentially controlled by the FPGA. Collected data is output to the data transmission unit according to a time sequence, and only one path of data output is gated at the same time. According to the utility model, each path of collected data corresponds to one special FIFO which is used as the storage unit, an external data storage chip is replaced, and the FPGA-based multipath data collector of X ray detection equipment is characterized by being lower in cost, reducing the system complexity and improving the utilization rate.

Description

The multi-path data collecting device of the X-ray detection equipment based on FPGA

Technical field

The utility model relates to the multi-path data collecting device in X-ray safety check and medical treatment detection device.

Background technology

Traditional data collector conventionally by programmable logic array FPGA as system control core, be equipped with digital-to-analog conversion AD converter simultaneously, exterior storage circuit and data transmission circuit form.And nowadays, the development of core system is more and more faster, Practical Project has more and more higher requirement to the utilization factor of system and production cost simultaneously, and the drawback that traditional data collector exists also reveals gradually.

The patent No. is that the utility model patent of ZL200520103263.1 discloses a kind of VGA data collecting card, this utility model relates to a kind of design based on FPGA circuit, analog/digital signal A/D converter, memory circuit, Peripheral Component Interconnect Standard PC I bus bridge chip and external interface circuit,, there is following defect in the system based under this design:

1) this system needs external SDRAM to be used as data storage, by FPGA, controls writing and reading of data; Increased the complexity that system is controlled;

2) owing to needing depositing in and reading of data, the directly system of transmission of comparing, its real-time is poor;

3) data upload speed is slower;

4) to configure special SDRAM chip, increase system cost;

5), for the collection of multichannel data and data are stored to SDRAM, the exterior storage chips such as Flash, have increased the requirement to whole system sequential control.

Summary of the invention

The purpose of this utility model is, a kind of multi-path data collecting device of the X-ray detection equipment based on FPGA is proposed, feature in conjunction with data collectors such as X-ray machines, utilize FPGA on-chip SRAM resource to be solidified into FIFO as the memory storage of data collector, replace the outside pin-saving chip receiving.Can effectively reduce the complexity that data collector external circuit connects, reduce system cost, relatively improve the utilization factor of whole data collector simultaneously.

The technical solution of the utility model is, a kind of data collector of the X-ray detection equipment based on FPGA, comprise that 2-16 circuit-switched data gathers the signal output part that path gathers X-ray detection equipment, every circuit-switched data gathers path and comprises the analog output signal of a road X-ray detection equipment and the AD AD conversion unit of corresponding connection, the output of AD AD conversion unit is connected to the corresponding FIFO storage unit that FPGA controls, multichannel data gating unit and the data transmission unit of FPGA output to the data in FIFO in multi-channel gating device, multi-channel gating device is turned on and off by the sequential control of FPGA, the data that collect are outputed to data transmission unit chronologically in order one by one, the one circuit-switched data output of the gating of same time.

Described simulating signal comprises the electric signal of X-ray signal and conversion; Its process is that X-ray signal is converted to corresponding electric signal by photoelectric conversion module, then electric signal is exported after the front-end processings such as amplification.

Device is for the data acquisition to X-ray safety check and medical treatment detection device, the exterior storage chip that do not superpose in the whole harvester adopting, and utilize the IP kernel of the altera corp of manufacturer of FPGA and FPGA to realize the data storage to each road according to actual acquisition way and collection capacity.

The utility model gathers path to each circuit-switched data and has all set up independently FIFO to store as data, and these FIFO also do not rely on exterior storage chip and realize, and solidified by FPGA, form, secondly because make each circuit-switched data gather all corresponding FIFO independently of channel, reduced the operation that traditional F PGA chip reads the first addressing of storage chip again.Described all sets up independently FIFO to store as data to each circuit-switched data collection path; Utilized the IP kernel of altera corp, FPGA calls FIFO makes it corresponding to each data acquisition path, data after AD conversion are connected by IO interface with the data input pin of FIFO, FPGA is full by the sky of FIFO corresponding to the every road of judgement simultaneously, and the data in FIFO are outputed in multi-channel gating device and realized.

The utility model is by the computational data capture card data that need storage per second and in conjunction with the characteristic of multi-channel data acquisition, and having adopted curing FPGA internal SRAM is FIFO, and the corresponding FIFO of each circuit-switched data harvester stores respectively.Can allow by this method each circuit-switched data leave respectively corresponding stored device in, when selecting, can read very easily, simultaneously because utilized resource-area in sheet to solidify FIFO, do not need again additional SDRAM or Flash chip, saved on the one hand actual design cost, faster convenience, has saved as the first selection of land of conventional store chip location is used in the complexity of read/write content on the other hand.

The beneficial effects of the utility model are: along with the development of fpga chip technology, built-in memory capacity and the clock frequency based on SRAM of FPGA had remarkable lifting, utilize the design of hardware description language reasonable disposition chip, will bring more efficient more economical achievement.

Accompanying drawing explanation

Fig. 1 is data collector structured flowchart of the present utility model;

Fig. 2 is the FIFO figure that the utility model utilizes Altera IP kernel to solidify in FPGA.

Embodiment

For clearer elaboration feature of the present utility model and effect, below in conjunction with accompanying drawing, the utility model is elaborated.Note, the utility model is not only confined to this example, and has ubiquity.

As shown in Figure 1, the utility model mainly by FPGA(, to adopt the model of the FPGA of altera corp be CYCLONE IVFPGA EP4CE115F29C7 etc.) system control module, AD modular converter, data fifo memory module and data transmission module form.Simulating signal in Fig. 1 (1)～(4) are carried out down synchronous acquisition at one time, enter into respectively inner (5)～(8) of A/D conversion chip and do the processing of AD conversion simultaneously, use this design in collection and switching rate, to have greatly improved, traditional data collector generally can deposit the data after the conversion of A/D conversion chip in exterior storage chip, but the utility model is in conjunction with adopted data volume size and deal with data rate requirement, data collector to safety check and medical X-ray checkout equipment has proposed with FPGA(9) FIFO(10 that goes out of inside solidification)～(13) be used as the storage unit of each circuit-switched data, have efficient, the feature of easily arranging.Be stored to FIFO(10)～(13) after, utilize FPGA(9) high primary frequency characteristic, through data transmission circuit (14) be uploaded to data terminal.Complete the collection to multichannel data.

As shown in Figure 2, embedded technology based on FPGA is in conjunction with the IP kernel of Altera, available fpga chip inside solidification goes out storage unit FIFO, and configure freely the corresponding FIFO of each circuit-switched data input, under the control of FPGA, complete the storage to multichannel data, the work such as data ordering, are applied to the non-large capacity harvester of similar X-ray screening machine one class, than storage chips such as traditional cumulative outside SDRAM or Flash, have significant advantage.

As Fig. 1, simulating signal enters into respectively each self-corresponding FIFO and carries out data storage through becoming digital signal after A/D conversion chip conversion.FIFO is the data-carrier store of first-in first-out, can will collect the data arranged in sequence that needs storage, then read by sequence, does not need extraneous addressing read-write.Reading empty request and writing full request by internal signal connecting line notice FPGA in FIFO, and coordinate the read request that connects by GPIO and write request to carry out corresponding read-write to control and coordinate adjustable write clock and readout clock to carry out relatively controlling freely with reading to the storage of data.When individual FIFO completes after storage, only needing to control multi-channel gating device unit in FPGA starts in turn and turn-offs the data of needs output, just can realize preferably in due order the data that output according to the order of sequence collects, and not need complicated rearrangement and addressing, greatly improve collecting efficiency.

The above is only preferred implementation of the present utility model; be noted that for those skilled in the art; not departing under the prerequisite of ultimate principle, can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims (2)

1. the multi-path data collecting device of the X-ray detection equipment based on FPGA, it is characterized in that comprising that 2-16 circuit-switched data gathers the signal output part that path gathers X-ray detection equipment, every circuit-switched data gathers path and comprises the analog output signal of a road X-ray detection equipment and the AD AD conversion unit of corresponding connection, the output of AD AD conversion unit is connected to the corresponding FIFO storage unit that FPGA controls, multichannel data gating unit and the data transmission unit of FPGA output to the data in FIFO in multi-channel gating device, multi-channel gating device is turned on and off by the sequential control of FPGA, the data that collect are outputed to data transmission unit chronologically in order one by one, the one circuit-switched data output of the gating of same time.

2. the multi-path data collecting device of the X-ray detection equipment based on FPGA according to claim 1, is characterized in that each circuit-switched data gathers path and all set up independently FIFO to store as data.