CN203014969U

CN203014969U - USB interface image acquisition device

Info

Publication number: CN203014969U
Application number: CN 201220662205
Authority: CN
Inventors: 古燕; 吴德馨
Original assignee: YIBIN XINFEIYA TECHNOLOGY Co Ltd
Current assignee: YIBIN XINFEIYA TECHNOLOGY Co Ltd
Priority date: 2012-12-05
Filing date: 2012-12-05
Publication date: 2013-06-19
Anticipated expiration: 2022-12-05

Abstract

The utility model provides a USB interface image acquisition device. The USB interface image acquisition device comprises a USB controller, a logic control chip, memories, an A/D conversion circuit and a CCD camera, wherein the CCD camera is connected with the A/D conversion circuit, the A/D conversion circuit is connected with the logic control chip, the logic control chip is connected with the USB controller and the memories, the USB controller employs a USB interface chip CY7C68013, the A/D conversion circuit comprises an anti-aliasing filter, a multipath selector switch and an A/D converter which are connected in order, the A/D converter employs a chip MAX1425, the anti-aliasing filter is connected with the CCD camera, and the A/D converter is connected with the logic control chip.

Description

A kind of USB interface image collecting device

Technical field

The utility model relates to the image collecting device field, and a kind of USB interface image collecting device is provided.

Background technology

Along with the image processing techniques fast development, require also more and more higher to image capture device.USB interface equipment is supported plug and play, and is easy for installation, is easy to expansion, and USB 2.0 can reach the theoretical transmission speed of 480 Mb/s, is highly suitable in the high-speed data acquistion system that is similar to IMAQ and uses.

Summary of the invention

The purpose of this utility model is to provide a kind of USB interface image collecting device.

The utility model is by the following technical solutions to achieve these goals:

a kind of USB interface image collecting device, it is characterized in that: comprise the USB controller, the logic control chip, memory, the A/D change-over circuit, the CCD camera, described camera connects the A/D change-over circuit, described A/D change-over circuit connects the logic control chip, described logic control chip connected storage and USB controller, described USB controller adopts USB interface chip CY7C68013, described A/D change-over circuit comprises the frequency overlapped-resistable filter that is linked in sequence, multidiameter option switch and A/D converter, described A/D converter adopts chip MAX1425, described frequency overlapped-resistable filter connects the CCD camera, A/D converter connects the logic control chip.

Because the utility model adopts above technical scheme, so possess following beneficial effect:

The utility model is aspect ultra-high-speed data acquisition, and FPGA has single-chip microcomputer and the incomparable advantage of DSP.The FPGA of a new generation is the even integrated kernel of central processing unit (CPU) or digital signal processor (DSP) carries out Hardware/Software Collaborative Design on a slice FPGA, provide powerful hardware supports for realizing programmable system on sheet (SOPC).The FPGA clock frequency is high, and internal delay time is little, and the maximum operating frequency of device can reach 300MHz now; Rich hardware resource, single chip integrated gate count available reach 1,000 ten thousand; All control logic is completed by hardware resource, and speed is fast, and efficient is high; Composition form is flexible, can integrated peripheral control, decoding and interface circuit.And.USB interface equipment is supported plug and play, and is easy for installation, is easy to expansion, and USB 2.0 can reach the theoretical transmission speed of 480 Mb/s, is highly suitable in the high-speed data acquistion system that is similar to IMAQ and uses.

Description of drawings

Fig. 1 is system block diagram of the present utility model.

Embodiment

Native system mainly is comprised of main frame (can support the PC of USB2.0 agreement), USB controller, logic control chip FPGA and A/D change-over circuit, as shown in Figure 1.Main frame is the terminal of system, mainly completes the functions such as data receiver, data processing, data demonstration and data preservation; The functions such as the main data acquisition of USB controller, data communication and control; The FPGA device is used for controlling and processes A/D, D/A as the control core of native system, carries out live signal collection and transmission control; The A/D change-over circuit is realized the digitlization of analog signal.Its sub data transmission two parts: control signal transmission and image data transmission.

System work process is: the main frame that can support the USB2.0 agreement, deposits in the control register of FPGA to controlling of sampling order of data acquisition system by CY7C68013.FPGA sends corresponding control signal according to this order to A/D converter.Because the ADC sample frequency is 10 MHz, for being complementary with the PC speed of service, at FIFO buffer of the inner generation of FPGA.A/D converter becomes digital signal to analog signal conversion under the ADC of FPGA interface control circuit is controlled, and deposits the sampled data of dedicated tunnel in FPGA inner FIFO buffer memory.Simultaneously, whether the USB interface control logic of FPGA inquiry CY7C68013 is idle, if idle, so by the USB interface control logic of the FPGA sampled result with dedicated tunnel, sends into the inside FIFO of CY7C68013 from the inner FIFO buffer memory of FPGA.After the FIFO of inside capacity acquired a certain degree, CY7C68013 was sent to PC with the data packing automatically.In sampling process, the USB interface control logic of FPGA is taken batch data successively away, and the A/D conversion continues to carry out when the USB interface packing transmits, and the inner FIFO of FPGA is also continued to write transformation result.

Claims

1. USB interface image collecting device, it is characterized in that: comprise the USB controller, the logic control chip, memory, the A/D change-over circuit, the CCD camera, described camera connects the A/D change-over circuit, described A/D change-over circuit connects the logic control chip, described logic control chip connected storage and USB controller, described USB controller adopts USB interface chip CY7C68013, described A/D change-over circuit comprises the frequency overlapped-resistable filter that is linked in sequence, multidiameter option switch and A/D converter, described A/D converter adopts chip MAX1425, described frequency overlapped-resistable filter connects the CCD camera, A/D converter connects the logic control chip.