CN103810052A - Bus detection and control method and device and mobile industry processor interface system thereof - Google Patents
Bus detection and control method and device and mobile industry processor interface system thereof Download PDFInfo
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- CN103810052A CN103810052A CN201210458847.5A CN201210458847A CN103810052A CN 103810052 A CN103810052 A CN 103810052A CN 201210458847 A CN201210458847 A CN 201210458847A CN 103810052 A CN103810052 A CN 103810052A
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Abstract
The invention discloses a bus detection and control method, which is used in a mobile industry processor interface system in which a main control end is coupled to a slave end through a mobile industry processor interface bus. The bus detection and control method comprises the steps of detecting the states of the mobile industry processor interface bus and the main control end so as to output a control signal; outputting a preset signal corresponding to an initial state according to the control signal, and selecting one of the preset signal and a transmission signal output by the main control end to the mobile industry processor interface bus to serve as a receiving signal of the slave end.
Description
Technical field
The present invention relates to a kind of bus detecting and control method and bus detecting and control device, relate in particular to one and can move industry processor interface (Mobile Industry Processor Interface one, MIPI) after the transmission of the signal of bus makes a mistake, force a subordinate end (slave) to maintain an original state, until a main control end (host) is also got back to after original state, subordinate end just receives the signal that main control end is exported, to avoid bus detecting and control method and bus detecting and the control device of signal transmission errors.
Background technology
Along with scientific and technological development, hand-held device, as intelligent mobile phone, personal digital assistant (Personal Digital Assistant, PDA) etc., has been integrated increasing communication and display technique, to realize application function miscellaneous.In order to control various application function simultaneously, between the processor and display panel of intelligent handheld device, (between a main control end and a subordinate end) needs a high speed processing interface, to improve volume of transmitted data, and then the function such as image quality or touch-control of lifting Display panel.Wherein, the High Speed Serial Transmission Interface of mobile industry processor interface (Mobile Industry Processor Interface, MIPI) for being widely used at present.But, in mobile industry processor interface system, the state that main control end and subordinate end share to it single mobile industry processor interface bus (bus) that carries out data transmission difference to some extent on may assert, and cause error of transmission.
For instance, please refer to Fig. 1, Fig. 1 known one moves the schematic diagram of industry processor interface system 10.As shown in Figure 1, in mobile industry processor interface system 10, a main control end 100 is coupled to a subordinate end 104 by single mobile industry processor interface bus 102, to carry out data transmission.
Under this structure, please refer to Fig. 2 A to Fig. 2 C, Fig. 2 A is that main control end 100 is carried out high speed differential signal when transmission, the signal schematic representation of mobile industry processor interface bus 102, Fig. 2 B is that main control end 100 is carried out bus while turning to (bus turnaround, BTA), the signal schematic representation of mobile industry processor interface bus 102, Fig. 2 C is that main control end 100 is carried out bus while turning to, the operation chart of mobile industry processor interface system 10.As shown in Figure 2 A, mobile industry processor interface bus 102 includes transmission line DN0, DP0.First,, in the time that main control end 100 is not transmitted the original state of data at first with subordinate end 104, the original state of mobile industry processor interface bus 102 is a LP11 halted state (being that transmission line DN0, DP0 are the high levle under low-power transmission pattern).Then, main control end 100 can first be transmitted high-speed transfer sequence (sequence) the indication subordinate end 104 as shown in frame as empty in Fig. 2 A and carry out the transmission of high speed differential signal to write instruction or data by starting, therefore subordinate end 104 can be set as high speed differential signal the operation according to this that a high-speed transfer pattern is transmitted to receive main control end 100, and in the time of high speed differential signal end of transmission or a default high-speed transfer timer expiration (time out), mobile industry processor interface bus 102 returns LP11 halted state (main control end 100 is also set as the initial original state of not transmitting data with subordinate end 104).
On the other hand, as shown in Fig. 2 B and Fig. 2 C, because main control end 100 and subordinate end 104 are to share mobile industry processor interface bus 102 to carry out data transmission, therefore when main control end 100 is wanted the data of retaking of a year or grade subordinate end 104 or state, main control end 100 can first be transmitted the bus turnaround sequence indication subordinate end 104 as shown in frame as empty in Fig. 2 B and will start to carry out data readback, now the control of mobile industry processor interface bus 102 is transferred to subordinate end 104 and main control end 100 and subordinate end 104 are converted into and are set as respectively a receiving end and a transmission ends (as shown in Figure 2 C) by being originally set as respectively a transmission ends and a receiving end, and then transmit according to this desired data of main control end 100 or status signal to main control end 100(transmission line DN0 as shown in Figure 2 B by subordinate end 104, the dotted portion of DP0).
But, please refer to Fig. 3 A and Fig. 3 B, Fig. 3 A is that main control end 100 is carried out bus while turning to, mobile industry processor interface bus 102 clashes the signal schematic representation of (contention), Fig. 3 B is mobile industry processor interface bus 102 while clashing, the operation chart of mobile industry processor interface system 10.As shown in 3A figure and Fig. 3 B, when the control that subordinate end 104 has a mobile industry processor interface bus 102 completing bus to turn to starts data transmission to main control end 100, if main control end 100 makes a mistake and still thinks the control (main control end 100 is converted to transmission ends by receiving end voluntarily) of possessing mobile industry processor interface bus 102, and start to transmit (transmission line DN0 as shown in Figure 3A, the high speed differential signal transmission that DP0 is carried out with latter half of solid line part), main control end 100 transfers to the signal that the signal of subordinate end 104 can transfer to main control end 100 with subordinate end 104 and clashes on mobile industry processor interface bus 102.
In the case, subordinate end 104 can stop signal transmission to main control end 100 and get back to original state, but because main control end 100 now can be held to pass and carried out data transmission, therefore subordinate end 104 can be strayed into other state by original state, and causes remarkable action (main control end 100 still continues to transmit low-power signal and make subordinate end 104 cause remarkable action with main control end 100 in the transmission of high speed differential signal or other situation as shown in Figure 3A).
On the other hand, please refer to Fig. 4, Fig. 4 is main control end 100 in the time that high-speed transfer timer expiration is still proceeded the transmission of high speed differential signal, the signal schematic representation of mobile industry processor interface bus 102.As shown in Figure 4, main control end 100 starts to carry out the transmission of high speed differential signal after transmitting a high-speed transfer sequence, and in the time of a time T high-speed transfer timer expiration, now according to normal standard, main control end 100 should stop transmission and main control end 100 should be got back to original state with subordinate end 104.But main control end 100 may make a mistake and continue transmitting high speed differential wave, makes subordinate end 104 again enter high-speed transfer pattern and solve misdata.
As from the foregoing, the identification difference to some extent of known main control end and the state (as the state of control or transmit timing device) of subordinate end to the share single mobile industry processor interface bus that carries out data transmission, and cause error of transmission.In view of this, known technology has improved necessity in fact.
Summary of the invention
Therefore, fundamental purpose of the present invention be to provide a kind of can be after a signal transmission of moving industry processor interface makes a mistake, force a subordinate end to maintain an original state, until a main control end is also got back to after original state, subordinate end just receives the signal that main control end is exported, to avoid bus detecting and control method and bus detecting and the control device of signal transmission errors.
The present invention discloses the detecting of a kind of bus and control method, moves industry processor interface system for one, and wherein a main control end moves industry processor interface by one and is coupled to a subordinate end.The detecting of this bus and control method include detecting this move the state of industry processor interface and this main control end, to export a control signal; And according to this control signal, output exports in the middle of this signal transmission that moves industry processor interface one to as a reception signal of this subordinate end corresponding to a preset signals of an original state and this main control end.
The present invention also discloses a kind of bus detecting and control device, move industry processor interface system for one, wherein a main control end moves industry processor interface by one and is coupled to a subordinate end, this bus detecting includes a bus controller with control device, be used for detecting this and move the state of industry processor interface and this main control end, to export a control signal; An and multiplexer, one first input end is used for receiving the preset signals corresponding to an original state, one second input end is used for receiving this main control end and exports this to and move a signal transmission of industry processor interface, this multiplexer is used for according to this control signal, and output exports in the middle of this this signal transmission that moves industry processor interface one to as a reception signal of this subordinate end corresponding to this preset signals of this original state and this main control end.
The present invention also discloses a kind of mobile industry processor interface system.This moves industry processor interface system and includes a subordinate end; One moves industry processor interface; One main control end, is moved industry processor interface and is coupled to this subordinate end by this; And bus detecting and a control device.The detecting of this bus includes a bus controller with control device, is used for detecting this and moves the state of industry processor interface and this main control end, to export a control signal; An and multiplexer, one first input end is used for receiving the preset signals corresponding to an original state, one second input end is used for receiving this main control end and exports this to and move a signal transmission of industry processor interface, this multiplexer is used for according to this control signal, and output exports in the middle of this this signal transmission that moves industry processor interface one to as a reception signal of this subordinate end corresponding to this preset signals of this original state and this main control end.
Coordinate detailed description and claims of following diagram, embodiment at this, by address other object of the present invention and advantage and be specified in after.
Accompanying drawing explanation
Fig. 1 known one moves the schematic diagram of industry processor interface system.
Fig. 2 A is that the main control end shown in Fig. 1 is carried out high speed differential signal when transmission, and one moves the signal schematic representation of industry processor interface bus.
Fig. 2 B is that the main control end shown in Fig. 1 is carried out bus while turning to, the signal schematic representation of mobile industry processor interface bus.
Fig. 2 C is that the main control end shown in Fig. 1 is carried out bus while turning to, the operation chart of mobile industry processor interface system.
Fig. 3 A is that the main control end shown in Fig. 1 is carried out bus while turning to, the signal schematic representation that mobile industry processor interface bus clashes.
Fig. 3 B is the mobile industry processor interface bus shown in Fig. 1 while clashing, the operation chart of mobile industry processor interface system.
Fig. 4 is the main control end shown in Fig. 1 in the time that high-speed transfer timer expiration is still proceeded the transmission of high speed differential signal, the signal schematic representation of mobile industry processor interface bus.
Fig. 5 A is the operation chart that the embodiment of the present invention one moves industry processor interface system.
Fig. 5 B is another operation chart of the mobile industry processor interface system shown in embodiment of the present invention Fig. 5 A.
Fig. 6 be the embodiment of the present invention another move the schematic diagram of industry processor interface system.
Fig. 7 is the schematic diagram of the embodiment of the present invention one bus detecting and control flow.
Wherein, description of reference numerals is as follows:
10,50,60 move industry processor interface system
100,500 main control end
102,502 move industry processor interface bus
104,504,604 subordinate ends
506 bus detecting and control device
508 bus controllers
510 multiplexers
70 flow processs
700～706 steps
DN0, DP0 transmission line
The T time
CON control signal
LP preset signals
TS signal transmission
RS receives signal
Embodiment
Please refer to Fig. 5 A, Fig. 5 A is the operation chart that the embodiment of the present invention one moves industry processor interface (Mobile Industry Processor Interface, MIPI) system 50.As shown in Fig. 5 A Lower Half, the main control end (host) 500, one that includes mobile industry processor interface system 50 moves industry processor interface bus 502, a subordinate end (slave) 504 and bus detecting and control device 506, wherein, bus detecting comprises a bus controller 508 and a multiplexer 510 with control device 506.In simple terms, main control end 500 is coupled to subordinate end 504 by mobile industry processor interface bus 502, to carry out data transmission, bus controller 508 can be detected the state of mobile industry processor interface bus 502 and main control end 500, give multiplexer 510 to export a control signal CON, make the multiplexer 510 can be according to control signal CON, export two input ends receive respectively export a signal transmission TS of mobile industry processor interface bus 502 to corresponding to a preset signals LP of an original state (as a LP11 halted state) and main control end 500 in the middle of one receive signal RS as one of subordinate end 504.Thus, the present invention can be in the time that the signal transmission of the mobile industry processor interface bus 502 of detecting makes a mistake, force subordinate end 504 to maintain an original state, until a main control end 500 is also got back to after original state, subordinate end 504 just receives the signal transmission TS that main control end 500 is exported, and causes signal transmission errors to avoid entering error condition.
Specifically, under general normal running, the state that bus controller 508 can be detected mobile industry processor interface bus 502 is normal, and now bus controller 508 utilizes control signal CON to control multiplexer 510 and exports the reception signal RS of signal transmission TS as subordinate end 504.On the other hand, detect mobile industry processor interface bus 502 at bus controller 508 (clashes as Fig. 3 B first half and Fig. 5 A first half move industry processor interface bus 502 after an error condition, the original state that now subordinate end 504 switches to), the reception signal RS that output control signal CON indication multiplexer 510 switches subordinate end 504 is that preset signals LP(corresponding to original state is as transmission line DN0 under LP11 halted state, DP0 is the high levle under low-power transmission pattern), so that being maintained to original state, subordinate end 504 can avoid the signal transmission TS that receives main control end 500 to make a mistake (as main control end 500 continues transmitting high speed differential wave or unknown low-power signal).Then, detecting main control end 500 at bus controller 508 also enters after original state, exporting the reception signal RS that control signal CON indication multiplexer 510 switches subordinate end 504 is the signal transmission TS that main control end 500 exports mobile industry processor interface bus 502 to again, to carry out normal signal transmission.
It should be noted that, main spirits of the present invention is can be in the time that the signal transmission of the mobile industry processor interface bus of detecting makes a mistake, force subordinate end to maintain original state, until main control end is also got back to after original state, subordinate end just receives the signal transmission that main control end is exported, and causes signal transmission errors to avoid entering error condition.Those of ordinary skills work as and can modify according to this or change, and are not limited to this.For instance, whether the signal transmission TS that bus controller 508 can export mobile industry processor interface bus 502 to by detecting main control end 500 is corresponding to original state, whether enter original state (as detecting transmission line DN0 initiatively to detect main control end 500, whether DP0 is all the high levle under low-power transmission pattern), but the trigger pip indication main control end 500 that also can export by detecting main control end 500 enters original state, whether enter original state with passive detecting main control end 500, as long as bus controller 508 can be detected main control end 500 and whether enter original state.In addition, for avoiding the long-time signal transmission TS that continues error of transmission of main control end 500, make a mistake and subordinate end 504 is got back to after original state in the signal transmission of the mobile industry processor interface bus 502 of detecting, subordinate end 504 can send a monitor signal to main control end 500, to notify main control end 500 should enter original state.
Moreover, in the embodiment shown in Fig. 5 A, bus controller 508 is that the mobile industry processor interface bus 502 of detecting clashes, and the signal transmission that judges mobile industry processor interface bus 502 makes a mistake, in other is implemented, also can otherwise detect and judge that the signal transmission of mobile industry processor interface bus 502 makes a mistake.For instance, please refer to Fig. 5 B, Fig. 5 B is another operation chart that the embodiment of the present invention moves industry processor interface system 50.As shown in Figure 5 B, expire (time out) main control end 500 while still continuing transmission signal transmission TS (as high-speed transfer timer expiration and main control end 500 still continues to carry out high-speed transfer at a transmit timing device, the original state that now subordinate end 504 switches to), bus controller 508 also can be detected mobile industry processor interface bus 502 in error condition, then exporting the reception signal RS that control signal CON indication multiplexer 510 switches subordinate end 504 is the preset signals LP corresponding to original state, so that subordinate end 504 is maintained to original state and can avoid the signal transmission TS that receives main control end 500 to make a mistake (as main control end 500 continues transmitting high speed differential wave).Then, detecting main control end 500 at bus controller 508 also enters after original state, exporting the reception signal RS that control signal CON indication multiplexer 510 switches subordinate end 504 is the signal transmission TS that main control end 500 exports mobile industry processor interface bus 502 to again, to carry out normal signal transmission.
In addition, in the mobile industry processor interface system 50 shown in Fig. 5 A and Fig. 5 B, bus detecting is arranged on subordinate end 504 outsides (on mobile industry processor interface bus 502) to carry out its associative operation with control device 506, but in other embodiments, bus detecting can be arranged on other position with control device.For instance, please refer to Fig. 6, Fig. 6 be the embodiment of the present invention another move the schematic diagram of industry processor interface system 60.Mobile industry processor interface system 60 is roughly the same with mobile industry processor interface system 50, therefore intimate assembly and signal represent with same-sign, only mobile industry processor interface system 60 is with the main difference of mobile industry processor interface system 50, the included subordinate end 604 of mobile industry processor interface system 60 is first to receive the signal transmission TS that main control end 500 exports mobile industry processor interface bus 502 to carry out (as physical layer circuit first carries out signal processing) after section processes, give subordinate end 604 by multiplexer 510 according to control signal CON switching output reception signal RS again and process (being that subordinate end 604 is still to receive the operating basis of signal RS as subsequent conditioning circuit) with subsequent conditioning circuit.
Therefore, bus detecting and the control operation of mobile industry processor interface system 50,60, can be summarized as a bus detecting and control flow 70, and as shown in Figure 7, it comprises the following steps:
Step 700: start.
Step 702: detect the state of mobile industry processor interface bus 502 and main control end 500, to export control signal CON.
Step 704: according to control signal CON, output exports in the middle of the signal transmission TS of mobile industry processor interface bus 502 one to as the reception signal RS of subordinate end corresponding to the preset signals LP of original state and main control end 500.
Step 706: finish.
The detailed content of bus detecting and control flow 70, can, with reference to the relevant narration of above-mentioned mobile industry processor interface system 50,60, not repeat them here.
In known skill is stated, the identification difference to some extent of main control end and the state (as the state of control or transmit timing device) of subordinate end to the share single mobile industry processor interface bus that carries out data transmission, and cause error of transmission.In comparison, the present invention can be in the time that the signal transmission of the mobile industry processor interface bus of detecting makes a mistake, force subordinate end to maintain original state, until main control end is also got back to after original state, subordinate end just receives the signal transmission that main control end is exported, and causes signal transmission errors to avoid entering error condition.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (28)
1. bus detecting and a control method, moves industry processor interface system for one, and wherein a main control end moves industry processor interface bus by one and is coupled to a subordinate end, it is characterized in that, this bus detecting includes with control method:
Detect the state that this moves industry processor interface bus and this main control end, to export a control signal;
And
According to this control signal, output exports in the middle of this signal transmission that moves industry processor interface bus one to as a reception signal of this subordinate end corresponding to a preset signals of an original state and this main control end.
2. bus detecting as claimed in claim 1 and control method, it is characterized in that, also include: in detecting, this moves industry processor interface bus after an error condition, this reception signal that this subordinate end is switched in this control signal indication is this preset signals corresponding to this original state.
3. bus detecting as claimed in claim 2 and control method, it is characterized in that, also include: enter after this original state in this main control end of detecting, this reception signal that this subordinate end is switched in the indication of this control signal is this signal transmission that this main control end exports this to and move industry processor interface bus.
4. bus detecting as claimed in claim 1 and control method, is characterized in that, this original state is a LP11 halted state.
5. bus as claimed in claim 2 detecting and control method, is characterized in that, this error condition relates to this and moves industry processor interface bus and clash.
6. bus detecting as claimed in claim 2 and control method, is characterized in that, this error condition relates to a transmit timing device and expires.
7. bus as claimed in claim 3 detecting and control method, is characterized in that, detects the step that this main control end enters this original state and include:
Detect this main control end and whether export this this signal transmission that moves industry processor interface bus to corresponding to this original state.
8. bus as claimed in claim 3 detecting and control method, is characterized in that, detects the step that this main control end enters this original state and include:
Detecting the trigger pip that this main control end exports indicates this main control end to enter this original state.
9. bus detecting as claimed in claim 2 and control method, is characterized in that, also includes: this subordinate end sends a monitor signal to this main control end, to notify this main control end to enter this original state.
10. bus detecting and a control device, moves industry processor interface system for one, and wherein a main control end moves industry processor interface bus by one and is coupled to a subordinate end, it is characterized in that, this bus detecting includes with control device:
One bus controller, is used for detecting this and moves the state of industry processor interface bus and this main control end, to export a control signal; And
One multiplexer, one first input end is used for receiving the preset signals corresponding to an original state, one second input end is used for receiving this main control end and exports this to and move a signal transmission of industry processor interface bus, this multiplexer is used for according to this control signal, and output exports in the middle of this this signal transmission that moves industry processor interface bus one to as a reception signal of this subordinate end corresponding to this preset signals of this original state and this main control end.
11. bus detecting as claimed in claim 10 and control device, it is characterized in that, detect this at this bus controller and move industry processor interface bus after an error condition, it is this preset signals corresponding to this original state that this control signal is indicated this reception signal that this multiplexer switches this subordinate end.
12. bus detecting as claimed in claim 11 and control device, it is characterized in that, detect this main control end at this bus controller and enter after this original state, it is this signal transmission that this main control end exports this to and move industry processor interface bus that this control signal is indicated this reception signal that this multiplexer switches this subordinate end.
13. bus detecting as claimed in claim 10 and control device, is characterized in that, this original state is a LP11 halted state.
14. buses as claimed in claim 11 detecting and control device, is characterized in that, this error condition relates to this and moves industry processor interface bus and clash.
15. bus detecting as claimed in claim 11 and control device, is characterized in that, this error condition relates to a transmit timing device and expires.
16. bus detecting as claimed in claim 12 and control device, it is characterized in that, this bus controller is detected this main control end and whether is exported this this signal transmission that moves industry processor interface bus to corresponding to this original state, whether enters this original state to detect this main control end.
17. buses as claimed in claim 12 detecting and control device, is characterized in that, this bus controller is detected the trigger pip that this main control end exports and indicated this main control end to enter this original state.
18. bus detecting as claimed in claim 11 and control device, is characterized in that, this subordinate end sends a monitor signal to this main control end, to notify this main control end to enter this original state.
19. 1 kinds of mobile industry processor interface systems, is characterized in that, include:
One subordinate end;
One moves industry processor interface bus;
One main control end, is moved industry processor interface bus and is coupled to this subordinate end by this; And
One bus detecting and control device, includes:
One bus controller, is used for detecting this and moves the state of industry processor interface bus and this main control end, to export a control signal; And
One multiplexer, one first input end is used for receiving the preset signals corresponding to an original state, one second input end is used for receiving this main control end and exports this to and move a signal transmission of industry processor interface bus, this multiplexer is used for according to this control signal, and output exports in the middle of this this signal transmission that moves industry processor interface bus one to as a reception signal of this subordinate end corresponding to this preset signals of this original state and this main control end.
20. mobile industry processor interface systems as claimed in claim 19, it is characterized in that, detect this at this bus controller and move industry processor interface bus after an error condition, it is this preset signals corresponding to this original state that this control signal is indicated this reception signal that this multiplexer switches this subordinate end.
21. mobile industry processor interface systems as claimed in claim 20, it is characterized in that, detect this main control end at this bus controller and enter after this original state, it is this signal transmission that this main control end exports this to and move industry processor interface bus that this control signal is indicated this reception signal that this multiplexer switches this subordinate end.
22. mobile industry processor interface systems as claimed in claim 19, is characterized in that, this original state is a LP11 halted state.
23. mobile industry processor interface systems as claimed in claim 20, is characterized in that, this error condition relates to this and moves industry processor interface bus and clash.
24. mobile industry processor interface systems as claimed in claim 20, is characterized in that, this error condition relates to a transmit timing device and expires.
25. mobile industry processor interface systems as claimed in claim 21, it is characterized in that, this bus controller is detected this main control end and whether is exported this this signal transmission that moves industry processor interface bus to corresponding to this original state, whether enters this original state to detect this main control end.
26. mobile industry processor interface systems as claimed in claim 21, is characterized in that, this bus controller is detected the trigger pip that this main control end exports and indicated this main control end to enter this original state.
27. mobile industry processor interface systems as claimed in claim 20, is characterized in that, this subordinate end sends a monitor signal to this main control end, to notify this main control end to enter this original state.
28. mobile industry processor interface systems as claimed in claim 19, is characterized in that, this bus detecting is arranged in this subordinate end with control device.
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