CN202171888U

CN202171888U - One-chip microcomputer and CPLD collaborative design experimental system

Info

Publication number: CN202171888U
Application number: CN2010206443123U
Authority: CN
Inventors: 刘昶; 孙丽梅
Original assignee: Shenyang Ligong University
Current assignee: Shenyang Ligong University
Priority date: 2010-12-07
Filing date: 2010-12-07
Publication date: 2012-03-21
Anticipated expiration: 2020-12-07

Abstract

A one-chip microcomputer and CPLD collaborative design experimental system comprises a one-chip microcomputer circuit and a CPLD circuit. The one-chip microcomputer circuit is connected with the CPLD circuit, a one-chip microcomputer and a CPLD are connected with a programming circuit separately, and the CPLD circuit is connected with a clock source circuit, a static memorizer circuit, an EEPROM circuit, an A/D converting circuit, an asynchronous serial communication circuit, a USB interface circuit, a temperature measurement circuit, an infrared transmitting circuit, an infrared receiving circuit, an LED static display circuit, an LED dynamic display circuit, an array keyboard circuit, a buzzer control circuit, a relay control circuit and a photoelectrical coupling output circuit. The one-chip microcomputer and CPLD collaborative design experimental system of the utility model has the advantages that the one-chip microcomputer and CPLD both can programme on-site, the circuit modules are complete, the reliability is good, the one-chip microcomputer and CPLD collaborative design experimental system is convenient to carry, etc.

Description

A kind of single-chip microcomputer and CPLD collaborative design experimental system

Technical field:

The utility model relates to a kind of Electronic Design applied teaching experimental system, and the teaching experiment system of a kind of single-chip microcomputer and CPLD collaborative design is provided especially.

Background technology:

Existing Electronic Design experimental system mostly is with certain single device; Like single-chip microcomputer, CPLD or FPGA is core devices; Other peripheral circuits all connect around this core devices; Form single-chip microcomputer experiment system or EDA experimental system, can only carry out single chip computer experiment or EDA experiment based on these experimental systems.Because single-chip microcomputer is good at and is carried out issued transaction, CPLD is good at and carries out logical process, therefore carries out collaborative design based on single-chip microcomputer and CPLD and has become one of trend of current Electronic Design.Existing some comprehensive experiment system; " based on the comprehensive experimental system of S51 single-chip microcomputer and CPLD " like developments such as Li Qing (seen " electric and electronic teaching journal " in June, 2009; The 31st the 3rd phase of volume; The 75-77 page or leaf), " based on single-chip microcomputer and the CPLD experimental system of ISP technology " of development such as Cheng Qiong (seen " experimental science is with technological " in February, 2009; The 7th the volume the 1st phase, the 71-72 page or leaf) though in have single-chip microcomputer and CPLD device simultaneously, these experimental systems still adopt single-chip microcomputer and CPLD to be connected the mode of peripheral circuit respectively; Therefore the advantage separately of single-chip microcomputer and CPLD can not be demonstrated fully, comprehensive single-chip microcomputer and CPLD collaborative design experiment can't be compared.

The utility model content:

The purpose of the utility model just is to overcome above-mentioned defective, and a kind of single-chip microcomputer and CPLD collaborative design teaching experiment system are provided, and is hardware platform with this experimental system, can carry out the experiment or the electronic engineering design of single-chip microcomputer and CPLD collaborative design.In this scheme, single-chip microcomputer only is connected with another acp chip CPLD as acp chip, and all peripheral function circuit all only are connected with the CPLD circuit, are not connected with single chip circuit.In the electronic system based on this structure; Single-chip microcomputer only carries out issued transaction, does not carry out any interface sequence or logical process, and all sequential and logical process are accomplished by CPLD; CPLD is designed to a coprocessor of single-chip microcomputer; Be used to handle more complicated affairs when adopting this structure can make single-chip microcomputer save a large amount of machines, give full play to the advantage separately of single-chip microcomputer and CPLD, finally realize the purpose of simplified system design.

The technical scheme that adopts is:

The teaching experiment system of a kind of single-chip microcomputer and CPLD collaborative design; Comprise single chip circuit and CPLD circuit; Single chip circuit connects the single-chip microcomputer programmed circuit; The CPLD circuit connects the CPLD programmed circuit, and the signal input part that the CPLD circuit connects clock source circuit, A/D change-over circuit, static memory circuit, eeprom circuit, asynchronous serial communication circuit, usb circuit, temperature measuring circuit, infrared transtation mission circuit, infrared receiving circuit, the static display circuit of LED, LED dynamic display circuit, matrix keyboard circuit, hummer control circuit, control relay circuit, photoelectricity coupling output circuit connects.

Singlechip chip in this scheme in the single chip circuit adopts the CPLD chip in AT89S51/52, the CPLD circuit to adopt the USB interface chip in XCR3256TQ144, the usb circuit to adopt FT245BL.

Except that the mcu programming circuit; Single chip circuit is not connected with any peripheral circuit, only is connected with the CPLD circuit, and single-chip microcomputer adopts the mode and the CPLD of external data communication to carry out exchanges data; Promptly use MOVX DPTR; The A instruction is sent data to CPLD, uses MOVX A, and DPTR instructs from the CPLD reading of data.The sequential that CPLD visits according to the single-chip microcomputer external data realizes the exchanges data with single-chip microcomputer, and according to the corresponding peripheral components of single-chip microcomputer instruction control, realizes function corresponding.Adopt this mode, CPLD is designed to the coprocessor of single-chip microcomputer as the bridge of single-chip microcomputer and peripheral circuit, and by means of this coprocessor, single-chip microcomputer only just can be realized the control to peripheral components with an instruction, in the time of can significantly practicing thrift the machine of single-chip microcomputer.

The beneficial effect of the utility model is:

1, can bring into play single-chip microcomputer and CPLD advantage separately, integrated use singlechip technology and EDA technology can be simplified electronic system design;

But 2, the equal field programming of single-chip microcomputer and CPLD, system is easy to use flexibly;

3, complete, the good reliability of circuit module; Can carry out multiple single-chip microcomputer coprocessor contrived experiment, as: LED dynamically shows coprocessor, matrix keyboard coprocessor, static memory visit coprocessor, asynchronous serial communication coprocessor, A/D conversion coprocessor, EEPROM visit coprocessor, USB interface coprocessor, temperature survey coprocessor, infrared transmission/receiving interface coprocessor etc.;

4, cooperate software can not only satisfy the needs of teaching, can also directly carry out the electronic engineering Application Design.

Description of drawings:

Fig. 1 is the circuit structure diagram of the utility model.

Embodiment:

In Fig. 1, power circuit 20 provides+5V and+3.3V direct supply, supply other modular circuit to use; Singlechip chip in the single chip circuit 1 adopts AT89S51/52, and its 32 I/O pins and ALE, XTAL1 pin all are connected to CPLD circuit 2, and for it work clock are provided by the CPLD circuit; CPLD chip in the CPLD circuit 2 adopts XCR3256TQ144;

Single chip circuit 1 is connected with mcu programming circuit 3, and the user can download to singlechip chip through mcu programming circuit 3; CPLD programmed circuit 4 is connected with CPLD circuit 2, and the user can download to the CPLD chip through CPLD programmed circuit 4.

Clock source circuit 5 is connected with CPLD circuit 2, for the CPLD chip provides work clock; A/D change-over circuit 6 is connected with CPLD circuit 2, and A/D conversion chip wherein can arrive CPLD with the result transmission of A/D conversion under the control of CPLD; Static memory circuit 7 is connected with CPLD circuit 2, and the static storage cell of 32K byte is provided, and under the control of CPLD, can carry out read and write access to these static storage cells; Eeprom circuit 8 is connected with CPLD circuit 2, and the EEPROM storage unit of 256 bytes is provided, and under the control of CPLD, can carry out read and write access to these EEPROM storage unit; Asynchronous serial communication circuit 9 is connected with CPLD circuit 2, and its function is to realize Transistor-Transistor Logic level and RS-232 level conversion, through this circuit, can realize the asynchronous serial communication of computing machine and experimental system; Usb circuit 10 is connected with CPLD circuit 2, and the USB interface chip in the usb circuit 10 is selected FT245BL for use, through this circuit, can realize the usb communication of computing machine and experimental system; Temperature measuring circuit 11 is connected with CPLD circuit 2, under the control of CPLD, can temperature measuring data be transferred to CPLD; Infrared transtation mission circuit 12 is connected with CPLD circuit 2, under CPLD control, can launch the infrared light of certain frequency; Infrared receiving circuit 13 is connected with CPLD circuit 2, when it receives the infrared light of 38KHz, and to the CPLD output low level, otherwise the output high level, CPLD can receive the information that transmits from infraluminescence circuit 12 in view of the above; The static display circuit 14 of LED is connected with CPLD circuit 2, is made up of 8 LED and related circuit, by the light on and off of CPLD control LED; LED dynamic display circuit 15 is connected with CPLD circuit 2, constitutes by 4 cloudy altogether 8 sections charactrons and related circuit, and by its dynamic refresh of CPLD control, thus display message; Matrix keyboard circuit 16 is connected with CPLD circuit 2, is made up of one 4 * 4 matrix keyboard, can send keyboard signal to CPLD; Buzzer circuit 17 is connected with CPLD circuit 2, and whether it sends buzz by CPLD control; Control relay circuit 18 is connected with CPLD circuit 2, by its switch of CPLD control; Photoelectricity coupling output circuit 19 is connected with CPLD circuit 2, is made up of 4 road photoelectric coupled devices, by its switch of CPLD control.

Under the cooperation of software, above circuit can be realized certain function, and teacher or student this experimental system capable of using and a computing machine are tested through programming accordingly.

Claims

1. single-chip microcomputer and CPLD collaborative design experimental system; Comprise single chip circuit and CPLD circuit; It is characterized in that: single chip circuit connects the CPLD circuit; Single chip circuit connects the single-chip microcomputer programmed circuit; The CPLD circuit connects the CPLD programmed circuit, and the CPLD circuit connects clock source circuit, A/D change-over circuit, static memory circuit, eeprom circuit, asynchronous serial communication circuit, usb circuit, temperature measuring circuit, infrared transtation mission circuit, infrared receiving circuit, the static display circuit of LED, LED dynamic display circuit, matrix keyboard circuit, hummer control circuit, control relay circuit, photoelectricity coupling output circuit.

2. a kind of single-chip microcomputer according to claim 1 and CPLD collaborative design experimental system;, it is characterized in that the singlechip chip in the single chip circuit (1) adopts the CPLD chip in AT89S51/52, the CPLD circuit (2) to adopt the USB interface chip in XCR3256TQ144, the usb circuit (10) to adopt FT245BL.