CN103176935A - Parallel bus interface communication method supporting hot plugging - Google Patents
Parallel bus interface communication method supporting hot plugging Download PDFInfo
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- CN103176935A CN103176935A CN2011104381314A CN201110438131A CN103176935A CN 103176935 A CN103176935 A CN 103176935A CN 2011104381314 A CN2011104381314 A CN 2011104381314A CN 201110438131 A CN201110438131 A CN 201110438131A CN 103176935 A CN103176935 A CN 103176935A
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Abstract
The invention discloses a parallel bus interface communication method supporting hot plugging. According to the parallel bus interface communication method supporting the hot plugging, whether external equipment is plugged through addition of detection of an external equipment plug signal of a host machine terminal, a reset signal is emitted to the external equipment in order to enable the external equipment to be initialized after the fact that the external equipment is plugged is detected, and the host machine terminal conducts communication with the external equipment through an I80 bus communication protocol. The parallel bus interface communication method supporting the hot plugging can achieve the reliable effective hot plugging of an I80 parallel bus interface. No signal converter needs to be added to the host machine terminal and an external equipment terminal, and therefore the system cost is greatly reduced.
Description
Technical field
The present invention relates to the communication interface field, particularly a kind of parallel bus interface communication means of supporting hot plug.
Background technology
Digital communication method is divided into two kinds of serial communication and parallel communicationss.The universal serial bus transmission speed is slower, and antijamming capability is stronger, relatively is fit to longer Distance Transmission.USB interface is serial communication method more common on computing machine, supports hot plug.And the parallel bus transmission speed is very fast, antijamming capability a little less than, more difficultly realize hot plug, classic method is to increase signal converter between host side and external unit end, host side changes parallel number bus signal into simulating signal or serial digital signal, and the external unit end changes simulating signal or serial digital signal into the number bus signal again.This has increased system cost, has also increased the signal transformation way simultaneously.
Summary of the invention
The purpose of this invention is to provide a kind of parallel bus interface communication means of supporting hot plug, realize the hot plug of parallel bus interface.
The invention provides a kind of parallel bus interface communication means of supporting hot plug, it is realized based on the host computer system with I80 parallel bus interface, comprises the following steps:
A, the external unit of host side is inserted signal detect, to confirm whether external unit inserts;
B, when external unit being detected and inserting, by highway switching, total line traffic control and data bus are switched to the external unit end from host side, and send reset signal to described external unit;
After c, described external unit receive described reset signal, carry out system initialization;
D, described host side communicate with I80 bus communication protocol and external unit after described external device start.
Described step a comprises the following steps:
It is high level that the external unit of a1, maintenance host side inserts the signal that detects pin;
A2, when the high level that described step a1 detected becomes low level, judge that external unit inserts.
Described method also comprises after described external unit being detected and extracting, by described highway switching, total line traffic control and data bus is changed to host side from described external unit end-grain cutting.
The external unit of described host side inserts and detects pin connection one pull-up resistor.
The band of described highway switching is wider than bus clock speed, and the switching capacity of described highway switching is low electric capacity.
Described parallel bus interface is provided with ESD, EMI protection device.
Bus connection wire between described host side and external unit end remains in a predetermined length.
Adopt a kind of parallel bus interface communication means of supporting hot plug of the present invention, it detects to confirm by the external unit insertion signal that increases host side whether external unit inserts, the backward external unit of external unit insertion detected and send the initialization of reset enable signal external unit, host side also communicates with I80 bus communication protocol and external unit.The present invention can realize the reliably hot plug effectively of I80 parallel bus interface, and needn't respectively increase signal converter spare in host side and external unit end, larger reduction system cost.
Description of drawings
Fig. 1 is the process flow diagram of one embodiment of the invention;
Fig. 2 is the parallel bus interface communication system principle block diagram of one embodiment of the invention;
Fig. 3 is the host side communication flow diagram of one embodiment of the invention;
Fig. 4 is the external unit end communication flow diagram of one embodiment of the invention.
Embodiment
Further illustrate technical scheme of the present invention below in conjunction with drawings and Examples.
Referring to Fig. 1, Fig. 1 is the process flow diagram 300 of one embodiment of the invention, concrete steps:
301, the external unit insertion signal of host side detected.
The external unit of described host side inserts and detects the pull-up resistor that pin connects a 100k, and keeping the external unit of host side to insert the signal that detects pin is high level, when described high level being detected and become low level, judges that external unit inserts.
When 302, the external unit insertion being detected, highway switching switches and sends reset signal to external unit.
When the external unit insertion being detected, by highway switching, total line traffic control and data bus are switched to the external unit end from host side, and send reset signal to described external unit;
303, external unit carries out system initialization after receiving reset signal.
304, described host side communicates with I80 bus communication protocol and external unit.
305, after described external unit being detected and extracting, by described highway switching, total line traffic control and data bus are changed to host side from described external unit end-grain cutting, finish communication.
Described host side communicates with I80 bus communication protocol and external unit after described external device start.
Communication system below by mobile terminal and portable projector is that example is described the present invention, with reference to figure 2, as shown in Figure 2, host-processor 001 is the baseband processor SC6600R on mobile terminal (host side), main equipment 002 is the LCD display on mobile terminal, outside is independently portable projector (below referred to as projector) of mobile terminal outside from equipment 003, and change-over switch 004 is the FSA2457 on mobile terminal.Wherein host-processor 001, main equipment 002, change-over switch 004 all are positioned on the host mobility terminal, and mobile terminal is connected by one group of 24PIN parallel bus with projector, support hot plug.
Parallel bus interface improves the I80 parallel bus interface of existing standard, keep original choosing of bus (CS), reset (RST), data/order (RS), read (WR), write data (DATA) signal of (RD) control signal and parallel bus, increase insertion detection signal (PLUG_DET) and synchronizing signal (TE).The insertion detection signal of projector is defaulted as high level, after projector inserts main frame, the projector internal processor inserts this and detects the pin output low level, after the baseband processor SC6600R of mobile terminal detects this insertion signal, by change-over switch FSA2457, total line traffic control and data bus are switched to the projector side from the LCD display of mobile terminal, to projector output reset signal, after projector detects this reset signal, carry out system initialization, communicate according to the I80 bus communication protocol after starting.Synchronizing signal is the synchronous control signal that projector sends mobile terminal.
The insertion of mobile terminal interface detects the pull-up resistor that a 100k is arranged on pin, does not have projector to insert or projector inserts but projector when being not activated, and this detection pin is high level.
The communication steps of mobile terminal (host side) when projector inserts be as shown in Figure 3:
101, mobile terminal electrifying startup;
102, the baseband processor SC6600R of mobile terminal detects by the insertion that interruption detects the 24PIN parallel bus interface whether pin is low level, if so, forwards 103 to;
103, baseband processor SC6600R exports a fixed image on LCD display, and preserve this picture in LCD output buffer memory, so that at bus switch to the projector rear flank, the fixing picture of output, then switch to the projector side by change-over switch FSA2457 with controling and data signal from the LCD display side on bus on LCD display;
104: baseband processor SC6600R exports reset signal on the reseting pin of parallel bus interface;
105: start the I80 bus protocol and communicate.
The communication steps when projector inserts of projector end (external unit end) is as shown in Figure 4:
202: the projector electrifying startup;
202: the projector processor is inserting the normal low level of detection pin output;
203: whether the projector processor detects reset signal on reseting pin, if so, forward 204 to;
204: the projector initialization;
205: start the I80 bus protocol and communicate.
After projector was extracted, the baseband processor SC6600 of mobile terminal pulled back to the LCD display bus side with highway switching from the projector side, then refreshed the picture that keeps in original LCD buffer memory.
Highway switching FSA2457 bandwidth is much larger than bus clock speed, and switching capacity only has 12pf.All place ESD (static release) and EMI (electromagnetic interference (EMI)) protection device near mobile terminal and equipment interface, device inside adopts lc circuit, rather than the RC circuit, in order to avoid resistance in series is too large.Also can ESD, EMI protection device be set at described parallel bus interface.
In addition, the bus connection wire length between mobile terminal and projector is as far as possible less than 30cm, to reduce the loss of bus signals.
Those of ordinary skill in the art will be appreciated that, above embodiment illustrates the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of above embodiment.
Claims (7)
1. parallel bus interface communication means of supporting hot plug, it is realized based on the host computer system with I80 parallel bus interface, it is characterized in that, comprises the following steps:
A, the external unit of host side is inserted signal detect, to confirm whether external unit inserts;
B, when external unit being detected and inserting, by highway switching, total line traffic control and data bus are switched to the external unit end from host side, and send reset signal to described external unit;
After c, described external unit receive described reset signal, carry out system initialization;
D, described host side communicate with I80 bus communication protocol and external unit after described external device start.
2. communication means as claimed in claim 1, is characterized in that, described step a comprises the following steps:
It is high level that the external unit of a1, maintenance host side inserts the signal that detects pin;
A2, when the high level that described step a1 detected becomes low level, judge that external unit inserts.
3. communication means as claimed in claim 2, is characterized in that, described method also comprises after described external unit being detected and extracting, by described highway switching, total line traffic control and data bus changed to host side from described external unit end-grain cutting.
4. communication means as claimed in claim 2, is characterized in that, the external unit of described host side inserts and detects pin connection one pull-up resistor.
5. communication means as described in claim 1 to 4 any one, is characterized in that, the band of described highway switching is wider than bus clock speed, and the switching capacity of described highway switching is low electric capacity.
6. communication means as described in claim 1 to 4 any one, is characterized in that, described parallel bus interface is provided with ESD, EMI protection device.
7. communication means as described in claim 1 to 4 any one, is characterized in that, the bus connection wire between described host side and external unit end remains in a predetermined length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104381314A CN103176935A (en) | 2011-12-23 | 2011-12-23 | Parallel bus interface communication method supporting hot plugging |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104381314A CN103176935A (en) | 2011-12-23 | 2011-12-23 | Parallel bus interface communication method supporting hot plugging |
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| CN103176935A true CN103176935A (en) | 2013-06-26 |
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| CN2011104381314A Pending CN103176935A (en) | 2011-12-23 | 2011-12-23 | Parallel bus interface communication method supporting hot plugging |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107038136A (en) * | 2016-02-04 | 2017-08-11 | 航天科工惯性技术有限公司 | A kind of PC104 bus switchs bottom plate |
| CN117975791A (en) * | 2024-04-02 | 2024-05-03 | 武汉派呦科技有限公司 | Entity program block table building system and entity program block |
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|---|---|---|---|---|
| US5379437A (en) * | 1992-11-16 | 1995-01-03 | International Business Machines Corp. | Reset of peripheral printing devices after a hot plug state |
| CN201042053Y (en) * | 2007-03-08 | 2008-03-26 | 四川长虹电器股份有限公司 | Hot swap processing circuit for HDMI signal receiver |
| CN101727430A (en) * | 2009-11-11 | 2010-06-09 | 中兴通讯股份有限公司 | Method and device for hot plug of card |
| CN202127441U (en) * | 2010-12-23 | 2012-01-25 | 上海闻泰电子科技有限公司 | Projection mobile terminal capable of supporting real media variable bitrate (RMVB) video format |
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2011
- 2011-12-23 CN CN2011104381314A patent/CN103176935A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5379437A (en) * | 1992-11-16 | 1995-01-03 | International Business Machines Corp. | Reset of peripheral printing devices after a hot plug state |
| CN201042053Y (en) * | 2007-03-08 | 2008-03-26 | 四川长虹电器股份有限公司 | Hot swap processing circuit for HDMI signal receiver |
| CN101727430A (en) * | 2009-11-11 | 2010-06-09 | 中兴通讯股份有限公司 | Method and device for hot plug of card |
| CN202127441U (en) * | 2010-12-23 | 2012-01-25 | 上海闻泰电子科技有限公司 | Projection mobile terminal capable of supporting real media variable bitrate (RMVB) video format |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107038136A (en) * | 2016-02-04 | 2017-08-11 | 航天科工惯性技术有限公司 | A kind of PC104 bus switchs bottom plate |
| CN117975791A (en) * | 2024-04-02 | 2024-05-03 | 武汉派呦科技有限公司 | Entity program block table building system and entity program block |
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Application publication date: 20130626 |