CN202171889U

CN202171889U - Portable universal CPLD/FPGA teaching experimental instrument

Info

Publication number: CN202171889U
Application number: CN2011200224837U
Authority: CN
Inventors: 聂章龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-01-18
Filing date: 2011-01-18
Publication date: 2012-03-21
Anticipated expiration: 2021-01-18

Abstract

The utility model relates to a teaching experimental instrument, especially to a portable universal experimental instrument used for the exploitation of the CPLD/FPGA (Programmable Logic Device/ Programmable Gata Array) technological field. The experimental instrument comprises a core plate, a universal expansion plate and a download plate, wherein the core plate is mainly formed by a smallest support circuit of a CPLD/FPGA master control chip of Altera company; the universal expansion plate is mainly formed by correlative peripheral experimental circuits of the CPLD/FPGA; the download plate is mainly formed by a signal buffer memory chip 74HC244. The experimental instrument employs a three-layer structure design in order to realize the versatility and to provide convenient for system update and upgrade. The download plate of the experimental instrument is in connection with a parallel port of a PC and then on-line programming can be directly performed through a JTAG mode in an environment of Quartus II of the PC, thus the experimental instrument, editing, compiling and downloading can be integrated into a whole. The experimental instrument has a small volume and interface connection is convenient; the electricity can be directly taken through a USB port to complete hardware experiments of more than 20 logic circuits and sequential circuits, which is in favor of better grasping the CPLD/FPGA principle and the exploitation technology thereof for students and of raising problem solving and innovation capabilities of the students.

Description

Portable universal CPLD/FPGA teaching experimental

Technical field

The utility model relates to a kind of teaching and experiment equipment, especially carries out the portable universal experiment instrument of CPLD/FPGA technical field exploitation.

Background technology

The many CPLD/FPGA hardware development stage apparatus that use at present in China colleges and universities generally all download the CPLD/FPGA chip and the stage apparatus fixed combination simultaneously, though do easy to usely like this, its shortcoming also is tangible.Mainly show: 1. the CPLD/FPGA chip integration lower (＜6000 gate leve) that uses is difficult to carry out complicated system-level circuit design; 2. the CPLD/FPGA chip pin limited amount that uses is no more than 84 pin usually, occurs unexhausted and the situation that the I/O pin uses inadequately of chip functions easily; Since CPLD/FPGA chip Fixed Design on the development platform device, the user can not upgrade and upgrading employed CPLD/FPGA chip, has limited the user and the CPLD/FPGA chip has been selected free; 4. general development platform device adopts traditional interface in design, volume is bigger, uses the external power supply power supply, is not easy to the student and uses at machine room, the autonomous learning that also is not easy to the time after school with carry.

Summary of the invention

The purpose of the utility model is exactly to the student collection experiment instrument, editor, compiling and a following experiment device for teaching that is stated from one that is connected with PC through parallel interface to be provided, and this experimental provision has versatility and portability.

This experiment instrument is made up of core board, general extension plate and following support plate three parts.Core board mainly is made up of with the socket that links to each other with expansion board the minimum support circuit of relevant CPLD/FPGA main control chip; The general extension plate mainly is made up of USB module, power module, diode module, the dynamic display module of LED, Keysheet module, toggle switch module, character liquid crystal display module, LED dot matrix display module, UART asynchronous serial communication module, buzzer circuit, sensor assembly, data acquisition module, PWM module, expansion interface etc., and following support plate mainly is made up of signal cache chip 74HC244, parallel interface, some pull-up resistors and electric capacity.

The utility model solves the technical scheme that its technical matters adopted: for the versatility (promptly portable) that realizes experiment instrument; Structurally adopt design proposal, realize the flexible replacing or the upgrading of hardware platform by core board, general extension plate and following support plate tertiary structure; In order to realize the use portability of experiment instrument; The working power of experiment instrument is passed through the USB mouth from the PC power taking; Need not to provide external power supply, power module has short-circuit protection function, and the brassboard apparent size is the PCB wiring board of 18*15cm; Download a mouthful socket and be equipped with the anti-plug counter-function, be convenient to student's down operation and carry.

This experiment instrument can be accomplished more than totally 20 hardware experiments such as combinational logic circuit design, Design of Sequential Logic Circuit Based and Design of Digital System (like the driving of peripheral interfaces such as keyboard, charactron, liquid crystal, dot matrix screen, hummer, temperature, micro-machine, data acquisition).During experiment if with the download plate interface of this experiment instrument with after the LPT of PC links to each other, under Quartus II environment, write experiment instrument peripheral circuit driver, directly editor, compile after, can carry out online download through the JTAG mode.

The advantage of the utility model is:

1), the experiment instrument hardware platform adopts the tertiary structure design, use flexibly, upgrade with upgrading conveniently.

2), the experiment instrument volume is little, interface is easy to connect, from the PC power taking, power module has short-circuit protection function by the USB mouth, downloading a mouthful socket all has the anti-plug counter-function, thereby is convenient to student's down operation and carries.

3), the general extension plate of experiment instrument has comprised logical circuit and the needed peripheral module of Sequential Circuit Design basically; In design, consider the needs of CPLD/FPGA Course Reform; Can accomplish the project exploitation of different difficulty, what help improving the student starts the ability of practice and innovation ability.

Description of drawings

Fig. 1 is the general extension plate structure synoptic diagram of the utility model.

Fig. 2 is the core board structural representation of the utility model.

Fig. 3 is the following carrying board structure synoptic diagram of the utility model.

Embodiment

Portable universal CPLD/FPGA teaching experimental is made up of core board, general extension plate and following support plate three parts.Core board links to each other with corresponding four plug sockets on the general extension plate through four socket pins; Following support plate is downloaded a mouthful contact pin through the JTAG socket of 10 cores with core board and is linked to each other; Core board mainly is made up of minimum support circuit and four row's pin contact pins of relevant CPLD/FPGA main control chip.As shown in Figure 1; Be general extension plate structure synoptic diagram, the general extension plate mainly is made up of USB module, power module, diode module, the dynamic display module of LED, Keysheet module, toggle switch module, character liquid crystal display module, LED dot matrix display module, UART asynchronous serial communication module, buzzer circuit, sensor assembly, data acquisition module, PWM module, expansion interface etc.; As shown in Figure 2; Be the core board structural representation; The family chip that main control chip on the core board can be downloaded for the support JTAG of altera corp; Like the serial EPM1270T144 of MAX II, EPM7128LS84 etc., the external crystal-controlled oscillation frequency is downloaded mouth and is anti-10 anti-inserted core JTAG mouth contact pins for can use high frequency; As shown in Figure 3, be following carrying board structure synoptic diagram, following support plate mainly is made up of signal cache chip 74HC244, parallel interface, anti-anti-inserted 10 core JTAG mouth sockets, some pull-up resistors and electric capacity.

The 5V working power that experiment instrument directly adopts usb bus to provide behind fuse and power switch, is connected to voltage transitions chip SPX1117, and conversion generates the work of 3.3V power supply confession acp chip; Data acquisition module is selected the ADC0809 chip for use in the general extension plate, can carry out the A/D transition experiment; Character-type liquid crystal display module is selected HD44780 for use, can show 2 row, 16 row characters; 8*8 monochromatic LED dot matrix can show simple Chinese character and character; The dynamic display module of LED adopts 4 to supply positive charactron, can realize that the dynamic scan of numeral shows; Sensor assembly comprises a line temperature sensor and an infrared sensor, can carry out temperature survey, track, keeps away experiments such as barrier; UART asynchronous serial communication module is linked to each other with 2 I/O mouth lines of acp chip through level transferring chip MAX232 by PC RS232 serial port, realizes the UART asynchronous serial communication; The PWM module mainly is to export corresponding frequencies through 2 I/O mouths of acp chip to realize micro-machine is driven.Lampet in 8 diode modules is selected red, green, yellow three kinds of colors for use, cooperates the output of traffic lights project to show; Keysheet module is 8 independent buttons, can match with passive hummer, realizes the operation debugging of digital electronic organ project; The toggle switch module can provide the input of 8 road logic level signals, and light-emitting diode (LED) module, buzzer circuit, Keysheet module and toggle switch module are common component, need not give unnecessary details.

The utility model can carry out code translator; Data selector; Scrambler; Full adder; Multiplier; Divider; Counter; Frequency divider; Light emitting diode control; The stand alone type keyboard; Hummer control; LED dynamically shows control; Chinese character shows control; The LCD character liquid crystal shows; Temperature survey; Simply track or keep away barrier; Digital electronic clock; The UART asynchronous serial communication; The traffic lights simulation; Four tunnel intelligence question-and-answer game apparatus; Signal generator; Multi-functional classroom display control program; The micro-machine drive controlling; More than 20 CPLD/FPGA experiment such as signals collecting.

Claims

1. portable universal CPLD/FPGA teaching experimental; Comprise core board, general extension plate and following support plate three parts composition; It is characterized in that: core board, general extension plate and following support plate all are circuit modules independently; The 10 core mouths of following support plate through standard link to each other with core board, are provided with four between core board and the general extension plate and arrange the step sockets and link to each other.

2. portable universal CPLD/FPGA teaching experimental according to claim 1; It is characterized in that: adopt the three-decker design to realize its versatility; Support the mainstream chip of international well-known CPLD/FPGA manufacturer more than 2 families, like the EPM1270T144 of the MAX II series of altera corp, EPM7128LS84 etc.

3. portable universal CPLD/FPGA teaching experimental according to claim 1; It is characterized in that: core board comprises the minimum support circuit and socket that links to each other with the general extension plate etc. of relevant CPLD/FPGA main control chip; The general extension plate comprises USB module, power module, diode module, the dynamic display module of LED, Keysheet module, toggle switch module, character liquid crystal display module, LED dot matrix display module, UART asynchronous serial communication module, buzzer circuit, sensor assembly, data acquisition module, PWM module, expansion interface etc., and following support plate comprises signal cache chip 74HC244, parallel interface, some pull-up resistors and electric capacity etc.