CN104360978A - SCART/UART interface multiplexing circuit and electronic equipment adopting same - Google Patents

SCART/UART interface multiplexing circuit and electronic equipment adopting same Download PDF

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Publication number
CN104360978A
CN104360978A CN201410489833.9A CN201410489833A CN104360978A CN 104360978 A CN104360978 A CN 104360978A CN 201410489833 A CN201410489833 A CN 201410489833A CN 104360978 A CN104360978 A CN 104360978A
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CN
China
Prior art keywords
scart
audio
video
module
serial data
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Granted
Application number
CN201410489833.9A
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Chinese (zh)
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CN104360978B (en
Inventor
颜利民
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Tianjin Samsung Electronics Co Ltd
Samsung Electronics Co Ltd
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Tianjin Samsung Electronics Co Ltd
Samsung Electronics Co Ltd
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Priority to CN201410489833.9A priority Critical patent/CN104360978B/en
Publication of CN104360978A publication Critical patent/CN104360978A/en
Application granted granted Critical
Publication of CN104360978B publication Critical patent/CN104360978B/en
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38Information transfer, e.g. on bus
    • G06F13/382Information transfer, e.g. on bus using universal interface adapter
    • G06F13/385Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices

Abstract

The invention provides an SCART/UART interface multiplexing circuit and electronic equipment adopting the same. The SCART/UART interface multiplexing circuit comprises an SCART interface unit, a transmitting mode judging unit, and a multiplexing control unit, wherein the SCART interface unit is used for transmitting audio-video data or serial data; the transmitting mode judging unit is used for judging the data transmitting mode selected by a main chip; the data transmitting modes comprise an audio-video data transmitting mode and a serial data transmitting mode; the multiplexing control unit is used for controlling the SCART interface unit to transmit the audio-video data when the audio-video data transmitting mode is selected, and controlling the SCART interface unit to transmit serial data when the serial data transmitting mode is selected. According to the invention, the SCART interface and the UART interface can be multiplexed; interface quantity is reduced, so as to meet requirements of lighting and thinning of electronic equipment, and beautify the appearance of products.

Description

SCART/UART interface multiplexing circuit and use the electronic equipment of this circuit
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of SCART/UART interface multiplexing circuit and use the electronic equipment of this circuit.
Background technology
Along with the development of infotech, UART (Universal Asynchronous Receiver/Transmitter, Universal Asynchronous Receive dispensing device) agreement electronic equipment exploitation debugging in be widely used, electronic equipment is often provided with UART interface, be connected into for UART data line, thus the data realized between electronic equipment and UART data line are transmitted.UART data line at least comprises RXT line and TXD line, and RXT line is for receiving serial data, and TXD is for sending serial data.
At present, for embedded development process, in order to carry out serial communication, the HeadPhone interface and the UART interface that are typically employed in configure dedicated on mainboard are carried out multiplexing, and concrete multiplex circuit as shown in Figure 1.HeadPhone/UART interface duplex needs just to be drawn by used for UART serial communication 2 signal wires at the beginning of circuit theory diagrams are drawn, HeadPhone interface shown in Fig. 1 is 7 pin earphone interface CN301_HP, the pin of L channel, R channel and MIC and UART interface is utilized to carry out multiplexing respectively, namely signal wire is TDE_FANET, RDE_FANET, IDENT tri-, wherein TDB_FDANET and RDN_FANET is UART signal of communication line, and whether IDENT signal wire is used for detecting interface and is communicated with.Need developer's manually welding junction on exploitation plate during actual use, then connect number-mode convertion platelet and just can communicate with main frame.Adopt HeadPhone/UART interface multiplexing circuit to have following shortcoming: 1, for do not possess HeadPhone interface circuit cannot with URAT interface duplex; 2, need extra wiring and placement interface on PCB, take PCB space, cause volume production cost; 3, manual welding complicated operation, easily produces defective products.
SCART (SyndicatdesConstructeursd'AppareilsRadior é cepteursetT é l é viseurs) interface is a kind of special audio-video interface, the audio-visual equipment interconnection industrial standard developed by French company Peritel, also be that the interconnection and interflow interface of European mandatory requirement in satellite television receiver, televisor, video recorder and other audio & video equipment has input and output function, support three kinds of video signal formats, i.e. CVBS (compound composite video signal), YC (component video signal) and RGB.In addition, SCART interface or transmitted in both directions, realize so-called " LOOP " circulatory function.The SCART interface of standard is 21 pin connectors, and external form is at right angles trapezoidal, is commonly called as " broom head ".Define audio and video frequency signal in this 21 pin, can be used to vision signal such as transmission CVBS and interlacing rgb signal etc., also can transmit stereo audio signal.21 pins transmit 21 signals simultaneously, and these 21 signals can be divided into vision signal, sound signal, control signal, ground wire and data line several.
Because SCART interface is European generic video interface, be widely used on all kinds of audio frequency and video electronic equipment.If both arranged SCART interface in this class of electronic devices, UART interface was set again, then need 2 interfaces be set on electronics is arranged simultaneously, the outward appearance of electronic equipment will be made thus to be affected, can not meet that electronic equipment is lightening, the demand of low cost.
Summary of the invention
The object of the present invention is to provide a kind of SCART/UART interface multiplexing circuit and use the electronic equipment of this circuit, can multiplexing SCART interface and UART interface, reduce interface quantity, thus meet the lightening demand of electronic equipment, beautify product appearance.
According to an aspect of the present invention, a kind of SCART/UART interface multiplexing circuit is provided, comprises:
SCART interface unit, for transmission tone video data or serial data;
Transmission mode judging unit, for judging the data-transmission mode that master chip is selected, described data-transmission mode comprises audio, video data transmission mode and serial data transmission pattern;
Multiplexing control module, for when audio, video data transmission mode, controls described SCART interface unit transmission tone video data; When serial data transmission pattern, control described SCART interface unit transmitting serial data.
Further, in described SCART/UART interface multiplexing circuit, described SCART interface unit, when serial data transmission pattern, PIN1 pin and PIN2 pin can be utilized to carry out serial communication, complete reception and the transmission of serial data, shield the data of all the other pins transmission; When audio video transmission pattern, according to the difference of transmission tone vision signal, different audio frequency and video pin transmission tone video datas can be utilized.
Further, in described SCART/UART interface multiplexing circuit, described multiplexing control module can comprise: Multiplexing switch module, audio, video data transport module and serial data transmission module;
Wherein, described Multiplexing switch module, can be connected with described serial data transmission module with described SCART interface unit, described audio video transmission module respectively, for when audio video transmission pattern, SCART interface unit is connected with described audio video transmission module, carries out audio, video data transmission; When serial data transmission pattern, described SCART interface unit is connected with described serial data transmission module, carries out serial communication.
Further, in described SCART/UART interface multiplexing circuit, described SCART interface unit can directly be connected with described serial data transmission unit with described audio video transmission unit; Described Multiplexing switch module is connected with described serial data transmission module with described audio video transmission module respectively, for when audio video transmission pattern, described audio video transmission module is made to be in opening, described serial data transmission module is in closed condition, to carry out audio, video data transmission by described audio video transmission module and described SCART interface unit; When serial data transmission pattern, make described serial data transmission module be in opening, described audio video transmission module is in closed condition, to carry out serial communication by described serial data transmission module and described SCART interface unit.
Further, in described SCART/UART interface multiplexing circuit, described audio video transmission module can be connected with the SCART audio-video signal line of master chip side, and opposite side is by described Multiplexing switch module or be directly connected with the audio frequency and video pin of described SCART interface unit.
Further, in described SCART/UART interface multiplexing circuit, described serial data transmission module can be connected with the UART null modem cable of master chip side, and opposite side is by described Multiplexing switch module or be directly connected with PIN2 pin with the PIN1 pin of described SCART interface unit.
Further, in described SCART/UART interface multiplexing circuit, described Multiplexing switch module can be analog switch.
Further, in described SCART/UART interface multiplexing circuit, described analog switch can at least comprise following pin: the SC_SR_OUT pin be connected with audio video transmission unit and SC_SR_IN pin, the TDB_FANET pin be connected with serial data transmission unit and RDB_FANET pin, the UART_SEL pin be connected with transmission mode judging unit, the AUDIO_IN pin be connected with SCART interface unit and AUDIO_OUT pin.
Further, in described SCART/UART interface multiplexing circuit, described transmission mode judging unit can be connected with the transmission mode control line of master chip side, and opposite side is connected with described multiplexing control module.
According to a further aspect in the invention, provide a kind of electronic equipment, described electronic equipment comprises above-mentioned SCART/UART interface multiplexing circuit.
According to SCART/UART interface multiplexing circuit of the present invention and the electronic equipment using this circuit, for the mainboard of all support SCART interfaces provides the function of carrying out serial communication, without the need to manually changing mainboard when making developer's embedded development, convenient exploitation and reduce the generation of defective products.Due to multiplexing SCART interface and UART interface, reduce interface quantity, fall equipment cost and circuit complexity, meet the demand that electronic equipment is lightening further, beautify product appearance, decrease the complexity of user operation, add the convenience that user uses.
Accompanying drawing explanation
By the description to embodiment carried out below in conjunction with accompanying drawing, above-mentioned and/or other object of the present invention and advantage will become apparent, wherein:
Fig. 1 illustrates and carries out multiplexing circuit diagram according to HeadPhone interface in background technology and UART interface;
Fig. 2 illustrates the structural representation of the SCART/UART interface multiplexing circuit provided according to an exemplary embodiment of the present;
Fig. 3 illustrates the structural representation of the SCART/UART interface multiplexing circuit provided according to another embodiment exemplifying;
Fig. 4 illustrates the circuit diagram of the SCART/UART interface multiplexing circuit provided according to another embodiment exemplifying;
Fig. 5 illustrates the structural representation of the SCART/UART interface multiplexing circuit provided according to another embodiment exemplifying.
Embodiment
Now will in detail with reference to embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein, identical label refers to identical parts all the time.Below by referring to accompanying drawing, described embodiment will be described, to explain the present invention.
Fig. 2 illustrates the structural representation of the SCART/UART interface multiplexing circuit provided according to an exemplary embodiment of the present.As shown in Figure 2, in SCART/UART interface multiplexing circuit according to an exemplary embodiment of the present invention, comprising: SCART interface unit 1, for transmission tone video data or serial data; Transmission mode judging unit 3, for judging the data-transmission mode that master chip 4 is selected, described data-transmission mode comprises audio, video data transmission mode and serial data transmission pattern; Multiplexing control module 2, for when audio, video data transmission mode, controls described SCART interface unit transmission tone video data; When serial data transmission pattern, control described SCART interface unit transmitting serial data.
In specific implementation, directly utilize existing SCART interface on mainboard, according to the data-transmission mode that master chip 4 is selected, SCART interface has been utilized to complete audio and video playing by multiplexing control module 2, also the transmission of serial data between SCART interface finishing equipment and other equipment (such as computing machine) can be utilized, do not need to increase other interface in above-mentioned known technology, thus fall equipment cost and circuit complexity.
In the present invention, described multiplexing control module 2 can be realized by hardware circuit, also can be by software simulating, or be realized by software and hardware combining.
In specific implementation, described SCART interface unit 1, can have 21 pins, when serial data transmission pattern, PIN1 pin and PIN2 pin can be utilized to carry out serial communication, complete reception and the transmission of serial data, shields the data of all the other pins transmission; When audio video transmission pattern, according to the difference of transmission tone vision signal, different audio frequency and video pin transmission tone video datas can be utilized.
In specific implementation, SCART interface supports three kinds of video signal formats, i.e. CVBS (compound composite video signal), YC (component video signal) and RGB, and according to the difference of signal transmission, the service condition of each pin is as follows, see table 1-3:
A, transmission composite video signal (Composite Video Only):
Table 1
B, transmit bright, look separation signal (YC Video Only):
Table 2
C, transmission composite video and R, G, B primary colour signal (Composite and RGBVideo):
Table 3
Concrete, see Fig. 3, be the structural representation of the SCART/UART interface multiplexing circuit that another embodiment of the present invention provides.As shown in Figure 3, described multiplexing control module 2 can comprise: Multiplexing switch module 22, audio, video data transport module 21 and serial data transmission module 23; Wherein, described Multiplexing switch module 22, can be connected with described serial data transmission module 23 with described SCART interface unit 1, described audio video transmission module 21 respectively, for when audio video transmission pattern, SCART interface unit 1 is connected with described audio video transmission module 21, carries out audio, video data transmission; When serial data transmission pattern, described SCART interface unit 1 is connected with described serial data transmission module 23, carries out serial communication.
In specific implementation, described audio video transmission module 21 can be connected with the SCART audio-video signal line of master chip 4 side, and opposite side is connected by the audio frequency and video pin of described Multiplexing switch module 22 with described SCART interface unit 1.Described serial data transmission module 23 can be connected with the UART null modem cable of master chip 4 side, and opposite side is connected with PIN2 pin with the PIN1 pin of described SCART interface unit 1 by described Multiplexing switch module 22.
Concrete, see Fig. 4, be the circuit diagram of the SCART/UART interface multiplexing circuit that another embodiment of the present invention provides.As shown in Figure 4, as preferred embodiment, described Multiplexing switch module can be analog switch IC305.
In specific implementation, described analog switch IC305 can at least comprise following pin: the SC_SR_OUT pin 7 be connected with audio video transmission module 21 and SC_SR_IN pin 5, the TDB_FANET pin 2 be connected with serial data transmission module 23 and RDB_FANET pin 10, the UART_SEL pin 8 and 4 be connected with transmission mode judging unit 3, the AUDIO_IN pin 9 be connected with PIN1 pin with the PIN2 pin of SCART interface unit 1 and AUDIO_OUT pin 3.
The principle of work of the present embodiment is described as follows: transmission mode judging unit 3 judges that transmission mode that master chip 4 is selected is, after audio, video data transmission mode or serial data transmission pattern, judged result is sent to the UART_SEL pin of IC305.When audio, video data transmission mode, the signal that UART_SEL pin receives is 1, AUDIO_IN pin 3 is connected with SC_SR_OUT pin 7 with SC_SR_IN pin 5 with AUDIO_OUT pin 9 by IC305 respectively, namely the PIN1 pin of SCART interface unit 1 is connected with the SCART audio-video signal line of PIN2 pin with the audio video transmission module 21 being connected master chip 4, now, SCART interface unit 1 is operated in normal audio, video data transmission mode, when serial data transmission pattern, the signal that UART_SEL pin receives is 0, AUDIO_IN pin 3 is connected with 10TDB_FANET pin 2 with RDB_FANET pin with AUDIO_OUT pin 9 by IC305 respectively, namely the PIN1 pin of SCART interface unit 1 is connected with the UART null modem cable of PIN2 pin with the serial data transmission module 23 being connected master chip 4, simultaneously, master chip 4 also can fall the signal shielding of other pin of SCART, only accept to come from the PIN1 pin of SCART interface unit 1 and the serial data of PIN2 pin, under making SCART interface unit 1 be operated in serial data transmission pattern.
Concrete, see Fig. 5, be the structural representation of the SCART/UART interface multiplexing circuit that another embodiment of the present invention provides.As shown in Figure 5, described SCART interface unit 1 can directly be connected with described serial data transmission module 23 with described audio video transmission module 21; Described Multiplexing switch module 22 is connected with described serial data transmission module 23 with described audio video transmission module 21 respectively, for when audio video transmission pattern, described audio video transmission module 21 is made to be in opening, described serial data transmission module 23 is in closed condition, to carry out audio, video data transmission by described audio video transmission module 21 with described SCART interface unit 1; When serial data transmission pattern, make described serial data transmission module 23 be in opening, described audio video transmission module 21 is in closed condition, to carry out serial communication by described serial data transmission module 23 with described SCART interface unit 1.
In specific implementation, described audio video transmission module 21 can be connected with the SCART audio-video signal line of master chip 4 side, and opposite side is directly connected with the audio frequency and video pin of described SCART interface unit 1.Described serial data transmission module 23 can be connected with the UART null modem cable of master chip 4 side, and opposite side is directly connected with PIN2 pin with the PIN1 pin of described SCART interface unit 1.
According to the electronic equipment that the embodiment of the present invention provides, described electronic equipment comprises above-mentioned SCART/UART interface multiplexing circuit.
Further, described electronic equipment can be multimedia player, televisor, game machine, and mobile terminal etc. have the electronic equipment of audio and video playing and data storage function concurrently.
According to SCART/UART interface multiplexing circuit of the present invention and the electronic equipment using this circuit, for the mainboard of all support SCART interfaces provides the function of carrying out serial communication, without the need to manually changing mainboard when making developer's embedded development, convenient exploitation and reduce the generation of defective products.Due to multiplexing SCART interface and UART interface, reduce interface quantity, fall equipment cost and circuit complexity, meet the demand that electronic equipment is lightening further, beautify product appearance, decrease the complexity of user operation, add the convenience that user uses.
Each embodiment above of the present invention is only exemplary, and the present invention is not limited to this.Those skilled in the art should understand that: without departing from the principles and spirit of the present invention, can change these embodiments, wherein, scope of the present invention limits in claim and equivalent thereof.

Claims (10)

1. a SCART/UART interface multiplexing circuit, comprising:
SCART interface unit, for transmission tone video data or serial data;
Transmission mode judging unit, for judging the data-transmission mode that master chip is selected, described data-transmission mode comprises audio, video data transmission mode and serial data transmission pattern;
Multiplexing control module, for when audio, video data transmission mode, controls described SCART interface unit transmission tone video data; When serial data transmission pattern, control described SCART interface unit transmitting serial data.
2. SCART/UART interface multiplexing circuit according to claim 1, is characterized in that, described SCART interface unit, when serial data transmission pattern, utilize PIN1 pin and PIN2 pin to carry out serial communication, complete reception and the transmission of serial data, shield the data of all the other pins transmission; When audio video transmission pattern, according to the difference of transmission tone vision signal, utilize different audio frequency and video pin transmission tone video datas.
3. SCART/UART interface multiplexing circuit according to claim 1 or 2, is characterized in that, described multiplexing control module comprises: Multiplexing switch module, audio, video data transport module and serial data transmission module;
Wherein, described Multiplexing switch module, is connected with described serial data transmission module with described SCART interface unit, described audio video transmission module respectively, for when audio video transmission pattern, SCART interface unit is connected with described audio video transmission module, carries out audio, video data transmission; When serial data transmission pattern, described SCART interface unit is connected with described serial data transmission module, carries out serial communication.
4. SCART/UART interface multiplexing circuit according to claim 1 or 2, is characterized in that, described multiplexing control module comprises: Multiplexing switch module, audio, video data transport module and serial data transmission module;
Wherein, described SCART interface unit is directly connected with described serial data transmission unit with described audio video transmission unit; Described Multiplexing switch module is connected with described serial data transmission module with described audio video transmission module respectively, for when audio video transmission pattern, described audio video transmission module is made to be in opening, described serial data transmission module is in closed condition, to carry out audio, video data transmission by described audio video transmission module and described SCART interface unit; When serial data transmission pattern, make described serial data transmission module be in opening, described audio video transmission module is in closed condition, to carry out serial communication by described serial data transmission module and described SCART interface unit.
5. SCART/UART interface multiplexing circuit according to claim 3 or 4, it is characterized in that, described audio video transmission module side is connected with the SCART audio-video signal line of master chip, and opposite side is by described Multiplexing switch module or be directly connected with the audio frequency and video pin of described SCART interface unit.
6. SCART/UART interface multiplexing circuit according to claim 3 or 4, it is characterized in that, described serial data transmission module side is connected with the UART null modem cable of master chip, and opposite side is by described Multiplexing switch module or be directly connected with PIN2 pin with the PIN1 pin of described SCART interface unit.
7. SCART/UART interface multiplexing circuit according to claim 3 or 4, is characterized in that, described Multiplexing switch module is analog switch.
8. SCART/UART interface multiplexing circuit according to claim 7, it is characterized in that, described analog switch at least comprises following pin: the SC_SR_OUT pin be connected with audio video transmission unit and SC_SR_IN pin, the TDB_FANET pin be connected with serial data transmission unit and RDB_FANET pin, the UART_SEL pin be connected with transmission mode judging unit, the AUDIO_IN pin be connected with SCART interface unit and AUDIO_OUT pin.
9. SCART/UART interface multiplexing circuit according to claim 3 or 4, is characterized in that: described transmission mode judging unit side is connected with the transmission mode control line of master chip, and opposite side is connected with described multiplexing control module.
10. an electronic equipment, is characterized in that, described electronic equipment comprises SCART/UART interface multiplexing circuit described in any one of claim 1-9.
CN201410489833.9A 2014-09-23 2014-09-23 SCART/UART interface multiplexing circuits and the electronic equipment using the circuit Expired - Fee Related CN104360978B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106201929A (en) * 2016-07-22 2016-12-07 恒宝股份有限公司 A kind of USB interface multiplex circuit and using method
CN110247775A (en) * 2019-05-21 2019-09-17 普联技术有限公司 A kind of UART and Ethernet multiplexer and Deplexing apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030089804A (en) * 2002-05-20 2003-11-28 삼성전자주식회사 SCART connector having a communication terminal
CN1697495A (en) * 2004-05-10 2005-11-16 广达电脑股份有限公司 TV set
CN202364306U (en) * 2011-11-16 2012-08-01 南通市智勇电子有限公司 HDMI coder-decoder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106201929A (en) * 2016-07-22 2016-12-07 恒宝股份有限公司 A kind of USB interface multiplex circuit and using method
CN110247775A (en) * 2019-05-21 2019-09-17 普联技术有限公司 A kind of UART and Ethernet multiplexer and Deplexing apparatus
CN110247775B (en) * 2019-05-21 2021-08-06 普联技术有限公司 UART and Ethernet multiplexing device and demultiplexing device

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