CN1617117A - Method for processing interrup request in optical disc driver - Google Patents
Method for processing interrup request in optical disc driver Download PDFInfo
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- CN1617117A CN1617117A CN 200310115644 CN200310115644A CN1617117A CN 1617117 A CN1617117 A CN 1617117A CN 200310115644 CN200310115644 CN 200310115644 CN 200310115644 A CN200310115644 A CN 200310115644A CN 1617117 A CN1617117 A CN 1617117A
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Abstract
The interrupt request processing method of optical disc driver during control operation or calculation operation includes the following steps completed while performing control operation or calculation operation: to receive the interrupt request from some control circuit; to check whether the interrupt request is one read command; to check whether the data to be read are in some buffer when the interrupt request is one read command; and to respond to the interrupt request to transmit the corresponding data from the buffer to the control circuit when the data to be read are in some buffer.
Description
Technical field
The invention provides a kind of method of interrupt request processing, be meant especially and a kind ofly carry out a method that needs interrupt request processing in the control operation exclusive disjunction process of long period in CD drive.
Background technology
Make the range of application of computer installation enlarge along with popularizing of computer installation, except general commercial purposes, personal computer also enters family so that for example function of multimedia recreation and so on to be provided thereupon.Because multimedia recreation needs huge image data and voice data to produce required sound and light program, therefore further drive the development of data storage technology.In order to allow the user can store numerical data more easily, various data storage devices one after the other occur.Wherein CD (Optical Disk) is because cost own is low, volume is little and characteristic capacious, so become the instrument that the user is used for noting down data in recent years.Except generic-document data or routine data, CD also is widely used for storing multi-medium data, for example voice data (Audio Stream) and image data (Video Stream) etc.Recorded data then needs to use a CD drive (Optical Disk Drive) to carry out access on the CD.
Please refer to Fig. 1.Fig. 1 is the synoptic diagram of a known CD drive 120 when cooperating main frames 110 work.Main frame 110 can be a main frame.CD drive 120 is typically connected to main frame 110, works with the steering order that receives main frame 110.Include a control circuit 122 in the CD drive 120, be used for the work of master control CD drive 120.In addition, also be provided with the servo module 140 that a non-volatile mnemonic 124 (as flash memory), a memory buffer 126 (as the random access memory of volatibility or register etc.) and are used for realizing the function of CD drive 120 in the CD drive 120.Memory buffer 126 is used for keeping in the essential data of CD drive 120 duration of works; And include electromechanical compos such as a Spindle Motor 142, a read head 146 in the servo module 140.Spindle Motor 142 is used for driving CD 150 and rotates; 146 of read heads can slide along a slide rail 144, with the data on the different tracks (Track) on the access CD 150.
Generally speaking, main frame 110 only need send the control circuit 122 of high-level steering order to the CD drive 120, and control circuit 122 just can be carried out firmware program code 130 in the nonvolatile memory storage 124 according to this steering order.Control circuit 122 is carried out the corresponding control program that is write down in the firmware program code 130, with the control servo module 140 actual major functions of carrying out CD drive 120.
For instance, when main frame 110 will read data on the CD 150, can transmit a data read and instruct to CD drive 120 and specify the address of these data on CD 150.Then control circuit 122 will be carried out the firmware program code 130 of CD drive 120 itself, is used for the work of elements such as Spindle Motor 142 in the coordinate Servo module 140, read head 146.For example, control Spindle Motor 142 reaches a specific rotating speed, mobile read head 146 to one planned orbits to receive 150 laser light reflected of CD etc.The data that servo module 140 is read by CD 150 can be kept in to memory buffer 126, then are sent to main frame 110 by control circuit 122.
See also Fig. 2.Fig. 2 reads flow process Figure 200 of data on the CD 150 according to a reading command of main frame 110 for CD drive 120 in the known technology.Flow process Figure 200 includes the following step:
Step 202: beginning.CD drive 120 utilizes control circuit 122 to receive and understand a reading command Instruction_A who is sent by main frame 110.
Step 204: CD drive 120 is carried out a data read program according to this reading command Instruction_A.
Step 206: utilize control circuit 122 to judge whether the data of desiring to read are arranged in memory buffer 126, if then carry out step 212; If not, then carry out step 208.
Step 208: utilize control circuit 122 to carry out firmware program code 130 and seek the rail operation with control servo module 140.
Step 210: utilize servo module 140 to read the specified data of this reading command Instruction_A on the CD 150, and the data that read are temporarily stored in the memory buffer 126.
Step 212: utilize control circuit 122 that corresponding data in the memory buffer 126 are sent to main frame 110, to respond this reading command.
Step 214: finish.
Above-mentioned CD drive 120 reads the detailed operation mode of data on the CD 150 and is known by those skilled in the art according to a reading command of main frame 110, not influencing under the disclosed situation of the technology of the present invention, does not repeat them here.
Generally speaking, main frame 110 transmits a reading command to CD drive 120, can wait until the desired data of CD drive 120 these reading command of passback after, just transmit next reading command to CD drive 120.(for example dialling the audio-visual data on the dish 150 of giving out light) when main frame 110 needs mass data on the CD 150, main frame 110 can constantly transmit reading command to CD drive 120, obtains the data on the CD 150.
In known technology, CD drive 120 can utilize memory buffer 126 to provide data to get the function of (Cache) soon usually.For example, if CD 150 is an audio-video CD (VCD), because the data that main frame 110 is desired to read successional audio-visual data on the CD 150 normally.Therefore, receive a reading command of main frame 110 when CD drive 120 after, not only the desired data of this reading command can be temporarily stored in the memory buffer 126, also follow-up data can be temporarily stored in the memory buffer 126 in the lump, carry out the usefulness that data are got soon when receiving follow-up reading command for CD drive 120.Promptly, in step 202, when main frame 110 transmitted this reading command Instruction_A to CD drive 120, CD drive 120 can carry out step 206, checked in the memory buffer 126 whether had the specified data of this reading command Instruction_A earlier.If the data of desiring to read have existed in the memory buffer 126, then only need carry out step 212, data in the memory buffer 126 are sent to main frame 110 to respond this reading command Instruction_A, and do not need from CD 150 to read the specified data of this reading command Instruction_A, therefore can promote the speed of CD drive 120 response main frames 110.
Usually in known technology, the memory buffer 126 of CD drive 120 can be provided with a data volume threshold value.After CD drive 120 is filled up the space of memory buffer 126 or is reached a specified level, the reading command that the data of being stored in the memory buffer 126 can be sent because of main frame 110 successively, and be sent to main frame 110.When as long as the data volume in the memory buffer 126 is higher than this data volume threshold value, CD drive 120 need not carried out the operation that data are replenished.When temporary data volume was equal to or less than this data volume threshold value in memory buffer 126, CD drive 120 just can read the follow-up data on the CD 150, and the data volume in the memory buffer 126 is filled up or make it to reach this specified level.
Therefore, in step 206, known technology exists in the memory buffer 126 if judge the specified data of this reading command Instruction_A, also can judge deduct the desired data of this reading command Instruction_A after, whether remaining data volume can drop to and be equal to or less than this data volume threshold value in the memory buffer 126.After if control circuit 122 is judged and in a single day the specified data of this reading command Instruction_A is sent to main frame 110, remaining data volume just can be equal to or less than this data volume threshold value in the middle of the memory buffer 126, then control circuit 122 can read follow-up data on the CD 150 with control servo module 140 according to the major loop of firmware program code 130, and temporary in memory buffer 126, make the data volume in the memory buffer 126 fill up or make it to reach this specified level.
And before will reading the data of CD 150, CD drive 120 need be sought the operation of rail (Seeking), so that read head 146 is moved on to suitable position.What is called is sought rail operation, is exactly in brief read head 146 is moved to the process of desiring the track under the reading of data along slide rail 144.Usually seeking the spent time of rail operation needs the number microsecond to microseconds up to a hundred (ms), if the time that long distance is sought rail (Long-Seeking) operation then to be needed may reach more than the several times.The data that CD drive 120 utilizes memory buffer 126 to provide are got function soon, can make the process of data transmission more smooth-going.Only in the data of desiring to read not in memory buffer 126, or have only part in memory buffer 126, and other part need read from CD 150, what CD drive 120 just need be carried out step 208 seeks the rail operation.
Yet, under the structure of the firmware program code 130 of known CD drive 120, when CD drive 120 is carried out the rail process of seeking of step 208 according to the major loop of firmware program code 130 in the middle of, when producing an interrupt request if receive the reading command Instruction_B that main frame 110 sends, this interrupt request can temporarily lie on the table.By the time after control circuit 122 was finished this routine program (being step 208) according to the major loop of firmware program code 130, CD drive 120 just can respond this interrupt request, and Instruction_B understands and handles to this reading command.In fact, just do not seek the rail operation, in the structure of known firmware program code 130, the processing mode of the interrupt request that in the process of the control operation exclusive disjunction that needs the long period, is produced for CD drive 120, all be earlier this interrupt request to be shelved, wait until after ongoing program is finished and just handle.And in the work of general CD drive, as the rotating speed of adjusting Spindle Motor 142 and read (Retry) or the like again, all be the example that needs the control operation exclusive disjunction of long period.
Know as known technology, the speed of CD drive 120 responses one reading command, the speed of seeking rail than CD drive 120 is a lot of soon.For example, suppose that main frame 110 is 1M byte per seconds by the speed of IDE or scsi bus interface transmission data, and the desired data length of each reading command that main frame 110 is transmitted is the 20k byte, and the time that then is equivalent to a reading command of CD drive 120 responses only needs 20 microseconds (ms).
As previously mentioned, if main frame 110 needs in the process of control operation exclusive disjunction of long period in CD drive 120, transmit this reading command Instruction_B to CD drive 120, then this reading command Instruction_B need wait for after CD drive 120 is finished ongoing program and just can meet with a response.Therefore, even the desired data of this reading command Instruction_B are arranged in memory buffer 126, after CD drive 120 must wait until that still this control operation exclusive disjunction is finished, CD drive 120 just can be handled this interrupt request, makes main frame 110 possibility factors cause the phenomenon of delay according to interruption.For example, in known technology, when utilizing CD drive 120, main frame 110 reads data on the audio-video CD, to carry out in the process that phonotape and videotape plays, if main frame 110 needed data have the situation of interruption, the process that then may cause phonotape and videotape to play produces the bad phenomenon of freeze-frame or delay.
For reducing the influence that postpones, the program design mode of known technology application state machine (State Machine) designs firmware program code 130.The state machine mode will need the control operation exclusive disjunction process of the CD drive 120 of long period, be divided into many stages (Stage) to carry out.Therefore, the employed time in each stage just can significantly reduce, and CD drive 120 just can utilize the interval in stage to handle to correspond to the interrupt request of the reading command that main frame 110 sends, and reduces the time that this reading command waits processing.
Yet the designed firmware program code of application state machine mode is comparatively complicated, makes firmware program code safeguard the degree of difficulty and cost increase when upgrading, and then has influence on the time point that product comes into the market.
Summary of the invention
Therefore fundamental purpose of the present invention is to provide a kind of control operation exclusive disjunction process in the one need long period of a CD drive parallel processing, and the method for an interrupt request, to address the above problem.
Provide a kind of in the preferred embodiment of the present invention and carry out a method that needs to handle in the control operation exclusive disjunction process of long period an interrupt request in a CD drive, this method includes when this control operation exclusive disjunction carries out, carries out following steps: utilize this CD drive to receive this interrupt request that a control circuit is transmitted; Check whether this interrupt request is a reading command; If this interrupt request is a reading command, check whether the specified desire reading of data of this reading command is present in the impact damper; And,, transmit the interior corresponding data of this impact damper to this control circuit in response to this interrupt request if this desire reading of data is present in this impact damper.
One of advantage of the present invention is that CD drive can be handled reading command when interrupt request takes place, therefore, even CD drive can also respond the reading command of main frame apace, and significantly reduce the situation of data delay among the control operation exclusive disjunction process of carrying out a need long period.
Another advantage of the present invention is the firmware program code design that does not need the user mode machine, can reduce the complexity of firmware program code, and promotes the convenience when safeguarding with renewal.
Description of drawings
Synoptic diagram when Fig. 1 cooperates a host work for a known CD drive.
Fig. 2 reads the process flow diagram of data on the CD according to a reading command of a main frame for a known CD drive.
Synoptic diagram when Fig. 3 cooperates a host work for a CD drive of the present invention.
Fig. 4 handles the process flow diagram of an interrupt request in the control operation exclusive disjunction process of carrying out a need long period for a CD drive of the present invention.
The reference numeral explanation
110 main frames
120,320 CD drive
122 control circuits
124 mnemonics
126 memory buffer
130,330 firmware program code
140 servo modules
142 Spindle Motors
144 slide rails
146 read heads
150 CDs
Embodiment
Please refer to Fig. 3.Fig. 3 is the synoptic diagram of CD drive of the present invention 320 when cooperating a main frame 110 work.CD drive 320 is very similar to the CD drive 120 of Fig. 1, therefore components identical is represented with same numbering in two CD drive, and the arrangements of components mode of CD drive 320 is all similar with CD drive 120, for for purpose of brevity, does not repeat them here.
And the difference of CD drive 320 of the present invention and known CD drive 120, the firmware program code 330 that is CD drive 320 is carried out in the control operation exclusive disjunction process of a need long period in CD drive 320, and the mode of handling an interrupt request is different with known technology.Below in the process flow diagram mode operative scenario of firmware program code 330 is described.
Fig. 4 represents the process flow diagram 400 of CD drive 320 of the present invention processing one interrupt request in the control operation exclusive disjunction process of carrying out a need long period.Process flow diagram 400 includes the following step:
Step 402: beginning.CD drive 320 needs in the control operation exclusive disjunction process (for example seek the rail operation, adjust rotating speed of Spindle Motor 142 or the like) of long period carrying out one, receives the instruction Instruction_C that main frame 110 sends and produces an interrupt request.
Step 404: the pairing content of being somebody's turn to do instruction Instruction_C of this interrupt request of control circuit 122 deciphers.
Step 406: utilize control circuit 122 to judge whether this instruction Instruction_C is a reading command, if then carry out step 408; If not, then carry out step 414.
Step 408: judge whether data designated that this reading command is desired is arranged in memory buffer 126, if then carry out step 410; If not, then carry out step 414.
Step 410: utilize control circuit 122 to be sent to main frame 110 by the specified data of this reading command in the memory buffer 126.
Step 412: control circuit 122 is removed this interrupt request.
Step 414: finish.The flow process of firmware program code 330 is got back in original performed major loop.
In a preferred embodiment of the present invention, CD drive 320 is in the process of the control operation exclusive disjunction that carries out a need long period, use CD drive proposed by the invention and handle the method for an interrupt request, so that the data of CD drive 320 transmission CDs 150 are more smooth-going to the process of main frame 110.For convenience of description, below lifting CD drive 320, to seek the process of rail operation be example, the working method of description of flow diagram 400.Please note, the method that CD drive of the present invention is handled an interrupt request is not limited to the process that CD drive is sought the rail operation, in fact, CD drive of the present invention is handled the method for an interrupt request, can be applicable to CD drive 320 and carries out in the process of any control operation exclusive disjunction.
As previously mentioned, when CD drive 320 when handling a reading command Instruction_A, check out that the specified data of this reading command Instruction_A are arranged in memory buffer 126, after also judging simultaneously deduction and falling the desired data of this reading command Instruction_A, temporary data volume can drop to and be equal to or less than a predetermined threshold value in the memory buffer 126.Therefore, CD drive 320 can utilize control circuit 122 that the data that correspond to this reading command Instruction_A in the memory buffer 126 are sent to main frame 110 on the one hand, on the other hand, the control circuit 122 of CD drive 320 also can carry out the program of a routine according to the major loop of firmware program code 330 with control servo module 140, that is seek rail operation, make CD drive 320 can read the follow-up data on the CD 150 and be temporarily stored in the memory buffer 126.
Yet CD drive 320 transmits the specified data of this reading command Instruction_A to the 110 needed times of main frame, and it is short a lot of to seek time of rail than CD drive 320 usually.Therefore, main frame 110 is probably before the servo module 140 of control CD drive 320 is finished the operation of seeking rail, just the data processing with this reading command Instruction_A finishes, and transmits another reading command Instruction_C to CD drive 320, requires to read follow-up data.
Therefore, in step 402, the control circuit 122 of CD drive 320 is sought in the process of rail operation at monitoring servo module 140, can receive this instruction Instruction_C that main frame 110 sends and produces an interrupt request.Then, in step 404, control circuit 122 can be after this interrupt request produces, the pairing content of being somebody's turn to do instruction Instruction_C of this interrupt request of decipher immediately.
In step 406, after the content of intact this instruction of control circuit 122 deciphers Instruction_C, can judge whether this instruction Instruction_C is a reading command.If this instruction Instruction_C that main frame 110 is sent this moment is not to be a reading command, then control circuit 122 can handle earlier ongoing seek the rail operation after, the priority of complying with this instruction again responds this instruction.Suppose that at this this instruction Instruction_C is that a reading command is with the explanation following step.
In step 408, after control circuit 122 was judged this instruction Instruction_C and is a reading command, control circuit 122 can check then that data that this reading command Instruction_C desires to read are whether in memory buffer 126.
Need reading of data from the CD 150 if the specified data of this reading command Instruction_C not in memory buffer 126, are then represented CD drive 320, but, can't restart other one and seek the rail operation because servo module 140 is just being sought the rail operation.Therefore, clearly, this reading command Instruction_C need wait for servo module 140 finish ongoing seek rail operation after, optionally whether decision needs to carry out again.Because ongoing these of 140 of servo modules are sought the purpose of rail operation, in order to read follow-up data on the CD 150 to replenish the data volume of memory buffer 126.If this routine program is identical with the data that this reading command Instruction_C desires to read, or the data that this routine answers program to desire to read have contained the needed data of this reading command Instruction_C, then clearly, CD drive 320 need not repeat once to seek the rail operation again for this reading command 320.
On the other hand, if the specified data of this reading command Instruction_C have only part in memory buffer 126, then in one embodiment of this invention, control circuit 122 can send back main frame 110 with those a part of data in memory buffer 126 earlier.Desired other data of this reading command Instruction_C then wait until equally servo module 140 finish ongoing seek rail operation after, optionally how decision is handled again.In another embodiment of the present invention, control circuit 122 can be waited until after the desired data of this reading command Instruction_C all are ready to and be sent to main frame 110 more in the lump.
Moreover in step 408, if the specified data of this reading command Instruction_C are all in memory buffer 126, then control circuit 122 can carry out step 410.
In step 410, control circuit 122 can be when seeking the rail operation, with corresponding to the data of this reading command Instruction_C in the memory buffer 126, be sent to main frame 110, be equivalent to ongoing this of parallel processing and seek rail operation and this reading command of response Instruction_C.Because monitoring servo module 140 is sought the circuit of rail operation in the control circuit 122, and be responsible for not conflicting mutually, so two kinds of operations of parallel processing can not cause negative effect to the function of CD drive 320 with the circuit of 110 transmission of main frame data.Therefore, main frame 110 just can be because of required data interruption, and work is affected or postpones.
By the time after control circuit 122 data that this reading command Instruction_C is required were sent to main frame 110 fully, control circuit 122 can carry out step 412, will remove corresponding to the interrupt request of this reading command Instruction_C.
In step 414, the flow process of the firmware program code 330 that control circuit 122 is performed can be got back in original performed major loop.As previously mentioned, because it is long with the time that data send back main frame 110 to seek the time ratio of rail action need, therefore, when control circuit 122 was finished the operation of this reading command of response Instruction_C, servo module 140 might not finished this as yet and is sought the rail operation.
In like manner, if servo module 140 is not finished this as yet and is sought the rail operation at this moment, the data of this reading command Instruction_C and main frame 110 disposes, and transmit another reading command Instruction_D to CD drive 320, then control circuit 120 can repeat the flow process of above-mentioned steps 404 to step 412, with this reading command of summary responses Instruction_D.
From the above, CD drive 320 of the present invention is handled the mode of an interrupt request in the control operation exclusive disjunction process of carrying out a need long period, original ongoing this control operation exclusive disjunction process can't be interrupted, the data read instruction that main frame 110 sends can be handled and respond again immediately.Because the firmware program code 330 of the present invention program design mode of user mode machine not, do not need to need the control operation exclusive disjunction of long period to be divided into many different phases and handle one, therefore, the complicacy of firmware program code 330 can significantly reduce.
In addition, when an interrupt request takes place, control circuit 122 only need use the just corresponding instruction of energy this interrupt request of decipher of a little computing energy, therefore, once this instruction is not a reading command, control circuit 122 temporarily can not handled, so the operation of servo module 140 can't be affected.And when this instruction was a reading command, control circuit 122 also only needed simple its needed data of inspection whether to be arranged in memory buffer 126, and if not, then control circuit 122 also wouldn't be handled this instruction; If the needed data of this reading command are arranged in memory buffer 126, then control circuit 122 corresponding data in memory buffer 126 are sent in the process of main frame 110, do not conflict with the circuit of control servo module 140 work owing to be responsible for the circuit of transmission data in the control circuit 122, so also can not have influence on the operate as normal of servo module 140.
In known technology, CD drive 120 by the time servo module 140 finish ongoing seek the rail operation after, just utilize control circuit 122 deciphers and respond the practice of the pairing instruction of this interrupt request, probably make main frame 110 influence the carrying out of work because of required data interruption.
The smoothness of method of the present invention except can significantly promote 110 transmission tones of CD drive 320 and main frame the time as data of optical disk, also because of the mode that need not adopt state machine designs firmware program code 330, so the complicacy of firmware program code 330 and maintenance, the cost when upgrading are all low than the firmware program code that adopts the state machine mode to design.
The above only is preferred embodiment of the present invention, and all equivalences of carrying out according to claim of the present invention change and revise, and all should belong to covering scope of the present invention.
Claims (7)
1. one kind is carried out the method for interrupt request processing in the control operation exclusive disjunction process in CD drive, and this method includes when this control operation exclusive disjunction carries out, carries out following steps:
Utilize this CD drive to receive this interrupt request that a control circuit is transmitted;
Check whether this interrupt request is a reading command;
If this interrupt request is a reading command, check whether the specified desire reading of data of this reading command is present in the impact damper; And
If this desire reading of data is present in this impact damper,, transmit the interior corresponding data of this impact damper to this control circuit in response to this interrupt request.
2. the method for claim 1, wherein this impact damper is a volatile memory of this CD drive.
3. the method for claim 1, wherein this impact damper is a register of this CD drive.
4. the method for claim 1, wherein this control circuit is a main frame.
5. the method for claim 1, it also includes:
If the specified desire reading of data of this reading command is not present in this impact damper, then wouldn't handle this interrupt request.
6. medium, the code that has program stored therein, this program code carries out following steps in order to the control CD drive when carrying out control operation exclusive disjunction process:
Receive this interrupt request that a control circuit is transmitted;
Check whether this interrupt request is a reading command;
If this interrupt request is a reading command, check whether the specified desire reading of data of this reading command is present in the impact damper; And
If this desire reading of data is present in this impact damper,, transmit the interior corresponding data of this impact damper to this control circuit in response to this interrupt request.
7. medium as claimed in claim 6, it is a nonvolatile memory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101156447A CN1318989C (en) | 2003-11-10 | 2003-11-10 | Method for processing interrup request in optical disc driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101156447A CN1318989C (en) | 2003-11-10 | 2003-11-10 | Method for processing interrup request in optical disc driver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1617117A true CN1617117A (en) | 2005-05-18 |
| CN1318989C CN1318989C (en) | 2007-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2003101156447A Expired - Fee Related CN1318989C (en) | 2003-11-10 | 2003-11-10 | Method for processing interrup request in optical disc driver |
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Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6772284B2 (en) * | 1997-03-18 | 2004-08-03 | Kabushiki Kaisha Toshiba | Disk apparatus capable of continuous display of data using a single recording head |
| US7116621B2 (en) * | 2001-01-25 | 2006-10-03 | Dphi Acquisitions, Inc. | System and method for handling commands in an optical disc drive |
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Granted publication date: 20070530 Termination date: 20161110 |