CN101127205B - Quick port switching method and related device - Google Patents
Quick port switching method and related device Download PDFInfo
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- CN101127205B CN101127205B CN2007101531883A CN200710153188A CN101127205B CN 101127205 B CN101127205 B CN 101127205B CN 2007101531883 A CN2007101531883 A CN 2007101531883A CN 200710153188 A CN200710153188 A CN 200710153188A CN 101127205 B CN101127205 B CN 101127205B
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Abstract
The utility model relates to a fast port switching method and relevant device; wherein, the display control circuit capable of quickly switching ports, comprises a display controller, a first TMDS port, a second TMDS port and an analog video port; the display controller comprises a first GPIO pin and a second GPIO pin. The first TMDS port, the second TMDS port and the analog video port are coupledon the display controller in order to respectively receive the first TMDS input, the second TMDS input and analog video signal. The first TMDS input and the second TMDS input respectively comprise th e first hot swap signal and the second hot swap signal; wherein, the first GPIO pin receives the first hot swap signal and the second GPIO pin receives the second hot swap signal.
Description
Technical field
The present invention relates to method and relevant apparatus that a kind of port switches, relate to a kind of method and relevant apparatus of quick port switching of many HDMI/DVI port especially.
Background technology
Early stage computer screen receives VGA (Video Graphics Array) specification signal and then display frame, developed gradually in order to promote image quality afterwards and DVI (digital visual interface) and HDMI (HDMI) specification signal, to show high-quality screen, especially the HDMI specification signal comprises audio-visual multi-media signal simultaneously, and popularizing in market gradually becomes the main flow that high image quality shows.
Computer display screens has the branch of low-order and high-order, early stage so-called high-order computer display screens has two VGA video ports (or claiming the D-SUB port), because the VGA video is an analog signal transmission, so industry is also with two VGA video port general term 2A (1A+1A) port fabric.As shown in Figure 1, high-order computer display screens (not shown) internal core has display controller 100, have two VGA video ports, can receive two VGA vision signals 102 and 104, produce output signal and be shown on the screen, the signal switch speed of the two VGA video ports of the long-term requirement of industry must reach the level in 2 seconds.
Popular along with the HDMI specification, high-order computer display screens now has a plurality of HDMI ports and a VGA video port, HDMI and VGA are respectively numeral and the transmission of simulating, high-order computer display screens with 1A+2D is an example, i.e. representative has a VGA video port and two HDMI ports.As shown in Figure 2, high-order computer display screens (not shown) internal core has display controller 200, the transmission standard that meets 1A+2D, have a VGA video port and two HDMI ports, can receive Shu VGA vision signal 202 and two HDMI inputs 204,206, display controller 200 produces output signal and is shown on the screen.Follow in the past industry to the requirement of 2A port fabric high-order computer display screens, industry wishes that also the port of the display controller 200 in the high-order computer display screens of 1A+2D switches (port switch) speed and must reach the level in 2 seconds.One skilled in the art can understand, and generally detect the VGA video port and need 0.5 second approximately, detect the HDMI port and need 2 seconds approximately, even more of a specified duration, therefore will detect the 1A+2D port at least about needs 4.5 seconds, the far requirement above 2 seconds.
Therefore very press for and develop the solution that a cover can quick port switches.
Summary of the invention
The present invention proposes a kind of display control circuit, comprise display controller, the one TMDS port, the 2nd TMDS port and analog video port, display controller has a GPIO (general output/input) pin and the 2nd GPIO pin, the one TMDS port, the 2nd TMDS port and analog video port are coupled to display controller, in order to receive TMDS input respectively, the 2nd TMDS input and analog video signal, the one TMDS input comprises the first hot plug signal and the second hot plug signal respectively with the 2nd TMDS input, wherein, a GPIO pin receives the first hot plug signal and the 2nd GPIO pin receives the second hot plug signal.Whether the one GPIO pin advocate by detecting the first hot plug signal, and whether whether determining TMDS input effective, and whether the 2nd GPIO pin advocates by detecting the second hot plug signal, to determine the 2nd TMDS input effective.
In this display control circuit, whether whether a GPIO pin advocates by detecting this first hot plug signal, to determine TMDS input effective.
In this display control circuit, whether whether the 2nd GPIO pin advocates by detecting this second hot plug signal, to determine the 2nd TMDS input effective.
In this display control circuit, also comprise an analog video port, be coupled to this display controller, in order to receive an analog video signal.
In this display control circuit, each TMDS port is a HDMI port.
In this display control circuit, each TMDS port is a DVI port.
The present invention also proposes a kind of display controller, comprise the first hot plug pin, the second hot plug pin, a GPIO pin and the 2nd GPIO pin, the one GPIO pin and the 2nd GPIO pin are coupled respectively to the first hot plug pin and the second hot plug pin, in order to the first hot plug signal that receives TMDS input respectively and the second hot plug signal of the 2nd TMDS input.Whether the one GPIO pin advocate by detecting the first hot plug signal, and whether whether determining TMDS input effective, and whether the 2nd GPIO pin advocates by detecting this second hot plug signal, to determine the 2nd TMDS input effective.
In this display controller, whether whether a GPIO pin advocates by detecting this first hot plug signal, to determine TMDS input effective.
In this display controller, whether whether the 2nd GPIO pin advocates by detecting this second hot plug signal, to determine the 2nd TMDS input effective.
In this display controller, also comprise an analog video port, in order to receive an analog video signal.
In this display controller, each TMDS input is a HDMI port, i.e. HDMI port.
In this display controller, each TMDS input is a digital visual interface port, i.e. DVI port.
The present invention also proposes the method that a kind of quick port switches, comprise the first hot plug signal that detects a TMDS port, whether advocated to detect the first hot plug signal, when the first hot plug signal is advocated, determine a TMDS port for effectively, read EDID data and decoding HDCP data then in regular turn; Detect the second hot plug signal of the 2nd TMDS port, whether advocated, when the second hot plug signal is advocated, determine the 2nd TMDS port for effective to detect the second hot plug signal; And the detection analog video signal, whether effective with the decision analog video signal.
In the method that this quick port switches, also comprise and detect an analog video signal, whether effective to determine this analog video signal.
In the method that this quick port switches, this step that detects this first hot plug signal is when this first hot plug signal is advocated, determines a TMDS port for effective.
In the method that this quick port switches, this step that detects this second hot plug signal is when this second hot plug signal is advocated, determines the 2nd TMDS port for effective.
In the method that this quick port switches, each TMDS input is a HDMI port, i.e. a HDMI port.
In the method that this quick port switches, each TMDS input is a digital visual interface port, i.e. a DVI port.
In the method that this quick port switches, also comprise and read extending display identification data data, the i.e. step of EDID data.
In the method that this quick port switches, also comprise the digital content protecting data of decoding one high bandwidth, i.e. the step of HDCP data.
In order further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet accompanying drawing only provide with reference to and explanation, be not to be used for the present invention is limited.
Description of drawings
Fig. 1 shows the display controller of known 2A high-order computer display screens inside.
Fig. 2 shows the display controller of known 1A+2D high-order computer display screens inside.
Fig. 3 shows the synoptic diagram of hot plug signal.
Fig. 4 shows the display control circuit according to the specific embodiment of the invention.
Fig. 5 shows the method flow diagram according to the quick port switching of the specific embodiment of the invention.
And each description of reference numerals in the above-mentioned accompanying drawing is as follows:
100,200,401 display controllers, 102,104 vision signals
202 VGA vision signals, 204,206 HDMI input
400 display control circuits, 402 analog video signals
414,416 signal paths
Embodiment
The present invention's expectation utilizes the hot plug signal HPD (hot plug detection) in the transmission of HDMI/DVI signal, solves the problems referred to above.Fig. 3 shows the synoptic diagram of hot plug signal HPD; typically the HDMI signal transmits EDID (extending display identification data), HDCP data such as (the digital content protectings of high bandwidth) in regular turn according to the state of hot plug signal HPD; be only TMDS (minimum translation difference sub-signal) output then; one skilled in the art solve EDID and HDCP in regular turn confirming on this HDMI port TMDS data transmission being arranged, and EDID and HDCP data account for 1.8 to 3.9 seconds.
Fig. 4 shows the display control circuit 400 according to the specific embodiment of the invention, comprise display controller 401, the transmission standard that meets 1A+2D, have an analog video port and two HDMI port (not shown), can correspondingly receive Shu analog video signal 402 and two HDMI input (not shown), analog video signal 402 for example is the VGA vision signal.Two HDMI inputs comprise hot plug signal HPDA and HPDB respectively, and therefore two HDMI ports receive hot plug signal HPDA and HPDB respectively.Display controller 401 all can have a plurality of general outputs/input (general purpose I/O usually, GPIO) pin GPIOA and GPIOB, hot plug signal HPDA and HPDB with two HDMI ports receptions, by signal path 414 and 416, send two GPIO pin GPIOA and GPIOB respectively to and carry out input.
Whether display controller 401 advocates (assert) by detecting GPIO pin GPIOA and GPIOB, determines whether each corresponding HDMI port is the useful signal transmission.When the HDMI signal that in fact has outside transmission to come in, can advocate corresponding hot plug signal, for example its level is high.In view of the above, whether display controller 401 advocates by detecting GPIO pin GPIOA and GPIOB among Fig. 4, determines whether each corresponding HDMI port is the useful signal transmission.For example, display controller 401, the transmission standard that meets 1A+2D, detect earlier whether signal was advocated about 0.5 second on the GPIO pin GPIOA, even shorter 0.1 second, go up the signal opinion if detect GPIOA, represent hot plug signal HPDA to be advocated, display controller 401 determines that just the HDMI signal on this corresponding HDMI port is effective, just continues the decoding of this HDMI signal HDCP and produces the output of TMDS signal.Otherwise, if not detecting GPIO pin GPIOA signal in 0.5 second advocates, just can switch to rapidly and detect side GPIO pin GPIOB, whether the HDMI signal that detects on another HDMI port is effective, go up the signal opinion if detect GPIOB, represent hot plug signal HPDB to be advocated, display controller 401 determines that just the HDMI signal on this corresponding HDMI port is effective, and continues the decoding of this HDMI signal HDCP and produce the output of TMDS signal.Otherwise, advocate if in 0.5 second, detect GPIO pin GPIOB signal whether the analog video signal 402 that just switches to rapidly on the detection analog video port is effective, for example is the VGA vision signal, need 0.5 second typical detection time approximately.Display controller 401 produces output signal display frame on screen or flat panel according to detected port signal.
According to previous embodiment, need the time in 0.5+0.5+0.5=1.5 second to finish the input of 1A+2D at most, even can reach the 0.1+0.1+0.5=0.7 performance in second, wish the demand in 2 seconds of reaching much smaller than industry.
Fig. 5 shows the method flow diagram according to the quick port switching of the specific embodiment of the invention, in this embodiment, is illustrative examples with quick switching 1A+2D port, and method enters step 510 from step 500, detects the first hot plug signal; Step 520 determines whether the first hot plug signal is advocated, if the first hot plug signal advocated then the step 530 of advancing, otherwise go to step 540; In step 530, a HDMI port of being advocated then to determine the first hot plug signal correspondence according to the first hot plug signal is for effective; In step 540, the first hot plug signal is not advocated, then switches to the 2nd HDMI port, detects the second hot plug signal; In step 542, determine whether the second hot plug signal is advocated, if the second hot plug signal advocated then the step 544 of advancing, otherwise go to step 550; In step 544, the 2nd HDMI port of being advocated then to determine the second hot plug signal correspondence according to the second hot plug signal is for effective; In step 550, the second hot plug signal is not advocated, then switches to the analog video port, detects analog video signal, for example VGA signal; In step 552, whether the decision analog video signal is effective, if effectively then the step 554 of advancing, the decision analog video signal is effective, otherwise returns step 510, detects from newly beginning.
One skilled in the art disclose according to the explanation of above embodiment, it can be applied to a plurality of HDMI ports and/or DVI port, because its transmission signals all is the TMDS signal, so general term HDMI port and DVI port are the TMDS port.
The present invention discloses a kind of display control circuit, comprise display controller, the one TMDS port, the 2nd TMDS port and analog video port, display controller has a GPIO (general output/input) pin and the 2nd GPIO pin, the one TMDS port, the 2nd TMDS port and analog video port are coupled to display controller, in order to receive TMDS input respectively, the 2nd TMDS input and analog video signal, the one TMDS input comprises the first hot plug signal and the second hot plug signal respectively with the 2nd TMDS input, wherein, a GPIO pin receives the first hot plug signal and the 2nd GPIO pin receives the second hot plug signal.Whether the one GPIO pin advocate by detecting the first hot plug signal, and whether whether determining TMDS input effective, and whether the 2nd GPIO pin advocates by detecting the second hot plug signal, to determine the 2nd TMDS input effective.The TMDS port can be HDMI port or DVI port.
The present invention also discloses a kind of display controller, comprise the first hot plug pin, the second hot plug pin, a GPIO pin and the 2nd GPIO pin, the one GPIO pin and the 2nd GPIO pin are coupled respectively to the first hot plug pin and the second hot plug pin, in order to the first hot plug signal that receives TMDS input respectively and the second hot plug signal of the 2nd TMDS input.Whether the one GPIO pin advocate by detecting the first hot plug signal, and whether whether determining TMDS input effective, and whether the 2nd GPIO pin advocates by detecting this second hot plug signal, to determine the 2nd TMDS input effective.Each TMDS input can be HDMI input or DVI input.
The present invention also discloses the method that a kind of quick port switches, comprise the first hot plug signal that detects a TMDS port, whether advocated to detect the first hot plug signal, when the first hot plug signal is advocated, determine a TMDS port for effectively, read EDID data and decoding HDCP data then in regular turn; Detect the second hot plug signal of the 2nd TMDS port, whether advocated, when the second hot plug signal is advocated, determine the 2nd TMDS port for effective to detect the second hot plug signal; And the detection analog video signal, whether effective with the decision analog video signal.The TMDS port can be HDMI port or DVI port.
In sum, though the present invention discloses as above with preferred embodiment, yet it is not in order to limit the present invention, for example, announcement according to above embodiment, one skilled in the art are appreciated that novel concept of the present invention can shorten the detection decision time of a plurality of HDMI/DVI ports, does not limit the existence that the VGA signal must be arranged.One skilled in the art without departing from the spirit and scope of the present invention, when can doing various changes and retouching, so protection scope of the present invention is as the criterion when looking the scope that the accompanying Claim book defined.
Claims (16)
1. display control circuit comprises:
One display controller has one first general output/input pin, i.e. a GPIO pin and one second general output/input pin, i.e. the 2nd GPIO pin;
One first minimum translation difference sub-signal port, promptly a TMDS port is coupled to this display controller, and in order to receive one the one TMDS input, TMDS input comprises one first hot plug signal; And
One second minimum translation difference sub-signal port, promptly the 2nd TMDS port is coupled to this display controller, and in order to receive one the 2nd TMDS input, the 2nd TMDS input comprises one second hot plug signal;
Wherein, a GPIO pin receives this first hot plug signal, and whether whether a GPIO pin advocates by detecting this first hot plug signal, to determine TMDS input effective; And the 2nd the GPIO pin receive this second hot plug signal, whether whether the 2nd GPIO pin advocate by detecting this second hot plug signal, to determine the 2nd TMDS input effective.
2. display control circuit according to claim 1 also comprises an analog video port, is coupled to this display controller, in order to receive an analog video signal.
3. display control circuit according to claim 1, wherein each TMDS port is a HDMI port, i.e. HDMI port.
4. display control circuit according to claim 1, wherein each TMDS port is a digital visual interface port, i.e. DVI port.
5. display controller comprises:
One first hot plug pin is in order to receive one first minimum translation difference sub-signal input, i.e. one first hot plug signal of TMDS input;
One second hot plug pin is in order to receive one second minimum translation difference sub-signal input, i.e. one second hot plug signal of the 2nd TMDS input;
One first general output/input pin, promptly a GPIO pin is coupled to this first hot plug pin, in order to receive this first hot plug signal, whether whether the one GPIO pin advocates by detecting this first hot plug signal, to determine TMDS input effective; And
One second general output/input pin, promptly the 2nd GPIO pin is coupled to this second hot plug pin, in order to receive this second hot plug signal, whether whether the 2nd GPIO pin advocates by detecting the second hot plug signal, to determine the 2nd TMDS input effective.
6. as display controller as described in the claim 5, also comprise an analog video port, in order to receive an analog video signal.
7. as display controller as described in the claim 5, wherein each TMDS input is a HDMI port, i.e. HDMI port.
8. as display controller as described in the claim 5, wherein each TMDS is input as a digital visual interface port, i.e. DVI port.
9. the method switched of a quick port comprises:
Detect one first minimum translation difference sub-signal port, promptly whether one first hot plug signal of a TMDS port is advocated to detect this first hot plug signal; And
Detect one second minimum translation difference sub-signal port, promptly whether one second hot plug signal of the 2nd TMDS port is advocated to detect this second hot plug signal.
10. whether the method for switching as quick port as described in the claim 9 also comprises and detects an analog video signal, effective to determine this analog video signal.
11. as the method that quick port as described in the claim 9 switches, wherein the step of this first hot plug signal of this detections is when this first hot plug signal is advocated, determines that a TMDS port is effective.
12. as the method that quick port as described in the claim 9 switches, wherein the step of this second hot plug signal of this detections is when this second hot plug signal is advocated, determines that the 2nd TMDS port is effective.
13. as the method that quick port as described in the claim 9 switches, wherein each TMDS input is a HDMI port, i.e. a HDMI port.
14. as the method that quick port as described in the claim 9 switches, wherein each TMDS is input as a digital visual interface port, i.e. a DVI port.
15. the method as quick port as described in the claim 11 switches also comprises and reads extending display identification data, the i.e. step of EDID data.
16., also comprise the digital content protecting data of decoding one high bandwidth, i.e. the step of HDCP data as the method that quick port as described in the claim 11 switches.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007101531883A CN101127205B (en) | 2007-09-28 | 2007-09-28 | Quick port switching method and related device |
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| CN2007101531883A CN101127205B (en) | 2007-09-28 | 2007-09-28 | Quick port switching method and related device |
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| CN101127205A CN101127205A (en) | 2008-02-20 |
| CN101127205B true CN101127205B (en) | 2010-06-02 |
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| CN2007101531883A Active CN101127205B (en) | 2007-09-28 | 2007-09-28 | Quick port switching method and related device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103259999B (en) | 2012-02-20 | 2016-06-15 | 联发科技（新加坡）私人有限公司 | HPD signal output control method, HDMI receiving device and system |
| US9892712B2 (en) * | 2014-12-08 | 2018-02-13 | Intel Corporation | Filtering hot plug detect signals |
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| US20010043286A1 (en) * | 2000-05-17 | 2001-11-22 | Hsieh Gary Kuan-Hong | Multimedia auto-switch system |
| US20030081131A1 (en) * | 2001-10-26 | 2003-05-01 | Koninklijke Philips Electronics N.V. | Method for viewing and controlling multiple DVR's |
| CN1459193A (en) * | 2001-03-09 | 2003-11-26 | 皇家菲利浦电子有限公司 | Method of switching between video signals in image switching apparatus |
| CN2919745Y (en) * | 2006-07-05 | 2007-07-04 | 海信集团有限公司 | Multi-circuit switching and extending circuit of HDMI interface and television |
| CN200950645Y (en) * | 2006-09-26 | 2007-09-19 | 青岛海信电器股份有限公司 | Multiplex HDMI signal interface switching circuit and television set |
| CN200953621Y (en) * | 2006-10-18 | 2007-09-26 | 青岛海信电器股份有限公司 | Television with multiplex HDMI inputting port |
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2007
- 2007-09-28 CN CN2007101531883A patent/CN101127205B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20010043286A1 (en) * | 2000-05-17 | 2001-11-22 | Hsieh Gary Kuan-Hong | Multimedia auto-switch system |
| CN1459193A (en) * | 2001-03-09 | 2003-11-26 | 皇家菲利浦电子有限公司 | Method of switching between video signals in image switching apparatus |
| US20030081131A1 (en) * | 2001-10-26 | 2003-05-01 | Koninklijke Philips Electronics N.V. | Method for viewing and controlling multiple DVR's |
| CN2919745Y (en) * | 2006-07-05 | 2007-07-04 | 海信集团有限公司 | Multi-circuit switching and extending circuit of HDMI interface and television |
| CN200950645Y (en) * | 2006-09-26 | 2007-09-19 | 青岛海信电器股份有限公司 | Multiplex HDMI signal interface switching circuit and television set |
| CN200953621Y (en) * | 2006-10-18 | 2007-09-26 | 青岛海信电器股份有限公司 | Television with multiplex HDMI inputting port |
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Effective date of registration: 20200410 Address after: No.1, Duhang 1st Road, Hsinchu City, Hsinchu Science Park, Taiwan, China Patentee after: MEDIATEK Inc. Address before: Hsinchu County, Taiwan, China Patentee before: MStar Semiconductor, Inc. |