JP3572650B2 - Interrupt controller and control method thereof - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to an interrupt controller for changing a transmission priority in a facsimile apparatus, and an interrupt control method.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in a facsimile apparatus, a transmission original is optically read by a scanner, optical-to-electrical conversion is performed, and then converted into binary "1" and "0" by a processor and stored in a read / write buffer. . The output read from the read / write buffer is input to a data compression device (DCR) where the data amount is reduced without losing the original information, and then guided to a high-speed modem via a data switch (DSU). After being modulated here, it is transmitted to the line via the DSU and the network control unit (NCU).
On the other hand, the modulated signal input from the line is guided to a high-speed modem via the NCU and DSU, demodulated into a digital signal by the modem, output to the DCR, reproduced here as original information, and read / write. -Stored in the buffer. In the read / write buffer, when the accumulated information exceeds one line, it is output to the write drive circuit in units of one line, and the received paper is advanced by one line.
Next, all information for transmission control of the facsimile apparatus is organized by a program, and after a parallel signal from the processor is converted into a serial signal, a check bit for checking a transmission error is added, and the information is transmitted via the DSU. It is guided to a high-speed modem, where it is modulated and sent out to the line via DSU and NCU.
All transmission control information input from the line is read by the software of the processor.
[0003]
Next, as software of the facsimile machine, there are (1) an initial execution program for executing initial setting and memory loading when the power is turned on, and (2) when there is an interrupt of a system operation start factor, the determination of the interrupt factor and the interrupt job routine are performed. An interrupt registration routine for executing management; (3) a job corresponding to each interrupt factor; a subroutine for an interrupt job for mainly controlling a mechanism; (4) a monitor routine for monitoring respective operations such as transmission, reception, and copying; And (5) there is a job routine for performing a job for each unit necessary for system control (for example, Richo Technical Report No. 1).
March 1979 pp. 61-62).
As described above, the conventional software includes an interrupt processing program, which is used to start the operation of the system by an interrupt. The interrupt factor is determined, and the work corresponding to each interrupt factor is performed. Is
On the other hand, there has not been a program that interrupts transmission document information, that is, a program that changes the priority of transmission and changes the next priority to the highest priority or the highest priority.
In other words, according to the conventional technology, the transmitted telegrams accumulated as soon as possible are transmitted first, and the priority of the document information for transmission is fixed, so that it is impossible to change this. there were.
[0004]
[Problems to be solved by the invention]
As described above, in the conventional facsimile apparatus, the priorities were fixed, so that the priorities could not be changed. Further, even if a request for a process with a higher priority is issued immediately after the execution of a process with a lower priority is started, the latter process is not accepted until the end of the former process. Note that when processing requests are issued from both at the same time, processing with a higher priority is performed first.
A first object of the present invention is to solve such a conventional problem and to provide an interrupt controller and an interrupt control method capable of changing a transmission order of document information and executing an interrupt process. .
A second object of the present invention is to eliminate the need to determine the priority, and execute the interrupt processing to be transmitted with priority each time. An object of the present invention is to provide an interrupt controller and an interrupt control method capable of first executing a process with a higher priority when a request is made.
A third object of the present invention is to determine priorities even during interrupt processing and to set the priority each time, so that when an interrupt request with a high priority occurs during interrupt processing, the processing is interrupted. An object of the present invention is to provide an interrupt controller and an interrupt control method capable of efficiently performing an interrupt process.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, an interrupt controller of the present invention comprises: (1) an interrupt controller that determines a transmission order for each transmission document information block in a facsimile apparatus, by changing a transmission order for each block , and an interrupt request receiving unit that receives an interrupt request for changing the priority or prior ranking ones (11), determines the transmission order in accordance with the variable to rank for each block of 該割 interrupt request, hold the determined transmission order A transmission order determination register unit (15) for setting a transmission order, and an interrupt request counter unit (12) for setting an initial value of a counter when the transmission order is determined and for starting an operation of counting time since an interrupt request is generated. , compares the count value for each block in 該割 included counter (12), the priority of the priority and the interrupt request in the interrupt processing Count value comparing unit for comparing the position (13) and the interrupt process interruption storage unit indicating that those subordinated interrupted preparation of interrupt processing to change the previously rank (16), 該Ka count value comparing section ( 13) and the transmission order determining register unit (15) and to interrupt processing suspended storage unit of each content (16) based on, as characterized by comprising a generator for generating an interrupt processing request or during interrupt processing disconnection request I have.
In the interrupt control method of the present invention, in the (2) interrupt control method for determining the transmission order of the facsimile apparatus, the transmission order for each block is changed, and the rear-order one is changed to the highest priority or the first priority. When an interrupt request causes is accepted, and sets the software transmission order of 該割 interrupt request, to counter (12) which該割 interrupt request counts the time from the occurrence, sets the same initial value Then, if there is an interrupt process that starts counting and then changes the next-priority one that is about to start processing to the first one, if an interrupt request with a higher priority is accepted, the interrupt request processing order is changed. The interrupt processing is started after the change.
Further, (3) by changing the order of transmission of each block, an interrupt request to change things subordinated to the highest priority to earlier order is accepted, the count time from 該割 interrupt request is generated The counters (12) to perform initial counts according to different interrupt priorities , and when the count value becomes equal to or greater than a predetermined value , change the rear rank of each block to the first rank for the first time. by starting the interrupt process causes, regardless of the priority of the interrupt, it is characterized in that to start the interrupt process to determine the interrupt request to be preferentially processed at that time.
Further, (4) by changing the order of transmission of each block, those subordinated an interrupt request to change the priority or prior order is accepted, and determines the transmission order of 該割 interrupt request,該割 The same initial value is set for the counter (12) that counts the time from the generation of the interrupt request, the count is started, and the priority is set during the interrupt processing for changing the next priority to the first priority. If high interrupt request is accepted, when count value in該割inclusive process is less than a predetermined value interrupts the interrupt processing, after processing above the interrupt request received later is interrupted It is characterized in that the processing is restarted and the processing is continued as it is when the value is equal to or greater than a predetermined value.
[0006]
[Action]
(1) In the first embodiment of the present invention, the priority is determined by software every time an interrupt request is accepted, so that the interrupt priority can be changed, and the LSI or the like can be changed after design. .
(2) In the second embodiment, a different counter value is set for each process that is to be given a priority. Even if there is no processing, processing is not performed up to a certain set value, and if an interrupt request to be processed with priority is jumped in, processing is performed so that processing with higher priority than necessary is made to wait The processing can be performed without any processing. That is, since the counter for counting the time from the occurrence of the interrupt request is provided, there is no need to determine the priority order, and the interrupt process to be processed with priority can be executed each time.
(3) In the third embodiment, when a high-priority interrupt request is accepted during interrupt processing, it is determined whether interrupt processing can be interrupted by referring to the counter value. Thus, the interrupt processing can be performed more efficiently. In other words, by providing a counter for counting the time from the occurrence of an interrupt request and setting a priority, when a high-priority interrupt request is issued during low-priority interrupt processing, , Interrupt processing with a higher priority can be executed first.
[0007]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 2 is a configuration diagram of an interrupt controller showing one embodiment of the present invention.
In FIG. 1, reference numeral 11 denotes an interrupt request receiving unit for receiving an interrupt request from a user, and 12 sets a counter value corresponding to a priority for each request, and performs an operation of counting the time since the interrupt request was issued. interrupt request counter unit which, 13 compares the priority of the priority and the newly requested interrupt the currently executing or in a count determines count value comparing section which one is earlier, 14 interrupt processing request a generator for generating an interrupt process interruption request, 15 determines the transmission order, the transmission order determination register unit to hold it, 16 stores the interrupt request interrupted for eviction, the interrupted request processing Is an interrupt processing interruption storage unit that returns from the storage after completion of the process .
The interrupt controller of the present invention is constituted by these devices, determines the transmission order of the facsimile original to be transmitted for each block of the transmission document information, and sends an interrupt processing start request.
The transmission order and the initial value of the interrupt request counter unit 12 are set by software.
Then, the transmission order set by the software and the initial value of the counter unit 12 are held in the transmission order determination register unit 15 and the interrupt counter unit 12, respectively.
The interrupt request counter unit 12 continues counting even when the interrupt processing is interrupted, and is reset to an initial value when the interrupt processing ends.
Further, the continuation of the processing and the determination of the interruption are determined by the interrupt processing request / interruption interruption request generation section 14 based on the data in the count value comparison section 13, the transmission order determination register section 15, and the interruption processing interruption storage section 16. Do.
[0008]
When an interrupt request occurs, the request is confirmed in the interrupt request receiving unit 11.
Next, the priority and the count value are set by software, the determined transmission order is held in the transmission order determination register unit 15, and the counting operation of the interrupt request counter unit 12 is started by the clock input.
(1) As a first embodiment, a case will be described in which the transmission order is determined each time an interrupt request is accepted, and an interrupt processing start request is made in accordance with the determined transmission order .
When an interrupt request is accepted, if there is no other interrupt request at that time and no interrupt processing is being performed, the requested interrupt processing operation is executed. That is, the priority and initial value (here, 0) of the interrupt request accepted by the interrupt request accepting unit 11 are determined by software, and the count value is set in the interrupt request counter unit 12 so that the counter unit 12 Starts an operation for counting time.
Most demanding priority is input through the count value comparison section 13 to the interrupt process interruption request generating unit 14, the transmission order and the interrupt processing suspended storage unit 16 held by the transmission order decision register unit 15 at the same time When a value (nothing is held) is also input to the generation unit 14, an interrupt processing start request is generated based on those values, and the request signal is output.
When a plurality of interrupt requests are received at the same time, the priority and the initial value are respectively determined by software, and the counting operation is started. Then, an interrupt processing start request is sequentially output in the order of transmission order .
Even if an interrupt request is accepted in the middle of processing, after the priority is determined, if the priority is the highest, a start request is output to the next priority that is currently being processed. Will be inserted.
[0009]
(2) As a second embodiment, a case will be described in which, when an interrupt request is accepted, different count values are set for requests to be given priority, and priority is not determined.
If there is another interrupt request in response to the request accepted by the interrupt request receiving unit 11, that is, if there is another interrupt request for which processing has not yet started, or if there is another interrupt request at the same time, the interrupt Since the request counter unit 12 also performs a counting operation for the request, the count value comparing unit 13 compares the value set in the counter unit 12, that is, the priority order, so that the higher priority order is obtained. Execute the process from.
For example, by setting the initial value of the counter unit 12 to 0 for a request that does not need to be prioritized, and setting an initial value to an integer value of 5, 10, 20, or the like for a request that has priority, a count value of 25 is obtained. Processing is started in response to the request. Therefore, the processing is not started until the number reaches 25 even if there is no processing. Thus, when an interrupt request to be processed with priority is received, it can be processed immediately.
Thus, it is not necessary to determine the priority order only by providing the counter unit for counting the time from the occurrence of the interrupt request, and it is possible to execute the interrupt process to be preferentially processed each time.
[0010]
(3) As a third embodiment, a counter is provided, and a priority is determined. If an interrupt request with a high priority is accepted during interrupt processing, the process is interrupted and a higher priority is given. The case where the interrupted processing is resumed after processing the request will be described.
If there is an interrupt request with a higher priority than the currently executing interrupt process while another request is executing the interrupt process, first refer to the value of the interrupt request counter section of the currently executing process and set it to a certain specified value. If it is, the process is continued, and if not, the process is interrupted, the interrupt process with the higher priority is executed, and the interrupted process is executed again after the process is completed. .
For example, it is defined that the processing is interrupted when the value of the counter unit 12 is 10 or less, and the processing is continued when the value is 11 or more.
It is assumed that an interrupt request has been accepted at the moment when the value of the interrupt request counter unit 12 becomes eight. In this case, the count value comparing unit 13 compares the priority of the request being processed with the priority of the interrupt request, and determines that the latter is higher and that the interrupt has occurred when the count value is 8. When each of them is detected, the interrupt request being processed is stored in the interrupt processing interruption storage unit 16 and saved . As a result, the interrupt processing request / interrupt interrupt request generating unit 14 inputs the contents of the transmission order determination register unit 15 and the interrupt processing interrupt storage unit 16, generates and outputs an interrupt processing interrupt request. As a result, the processing being executed is interrupted, and an interrupt processing start request of the newly input interrupt request is output. After this processing is completed, the storage of the interruption processing interruption storage unit 16 is read , and the interruption processing request generation unit 14 outputs the processing restart of the interrupted and waiting request.
[0011]
FIG. 2 is an operation flowchart of an interrupt control method according to a third embodiment of the present invention.
First, normal processing is performed, initialization of the interrupt request counter unit 12 is performed, and a priority order is determined (step 101). Next, it is determined whether or not there is an interrupt request (step 102). If not, the normal processing is performed while repeating the determination. If there is an interrupt request, the request is accepted (step 103). In response to the request, the interrupt request counter 12 starts counting (step 104), and determines whether another interrupt is being processed (step 105). If another interrupt is being processed, the counter value of the interrupt request counter unit 12 is referred to, and the priority comparison is performed by the counter value comparison unit 13 (step 106). It is determined whether or not the interrupt processing being executed is interrupted (step 107). That is, when the counter value is equal to or greater than a predetermined threshold value or when the interrupt processing being executed has a higher priority, the processing is continued without interrupting the interrupt processing being executed. Then, it is determined whether or not the interrupt processing being executed is completed (step 108). Upon completion, the flow returns to step 105 again to determine whether or not another interrupt is being processed.
[0012]
If it is determined in step 105 that other interrupt processing is not being performed, interrupt processing is started (step 109). It is determined whether or not there is an interrupt processing interruption request (step 110). If there is no interruption request, the process ends normally. On the other hand, if there is an interrupt processing interruption request, the processing is interrupted (step 111), and interrupt processing with a high priority is started (step 112). It is determined whether or not the executed processing has been completed (step 113), and if completed, the interrupted processing is resumed (step 114). Then, the processing is terminated.
In step 107, the priority of the interrupt processing being executed and the counter value are referred to, and this is compared with the priority of the newly accepted interrupt request, thereby interrupting the interrupt processing being executed. If determined, it is further determined whether or not there is an interrupt processing interruption request (step 110). If not, the interrupt processing is normally terminated. Further, if there is an interrupt processing interruption request, since an interrupt request with a higher priority has been accepted, the processing is interrupted (step 111), and interrupt processing with a higher priority is started (step 112). When the processing is completed (step 113), the interrupted processing is resumed, and when the processing is completed, the processing which was interrupted first is restarted (step 114).
[0013]
【The invention's effect】
As described above, according to the present invention, the priority can be determined by software even after the interrupt controller is designed, so that the interrupt priority can be changed. Also, by providing a counter that counts the time from the occurrence of the interrupt request and making the initial value different according to the priority, it is possible to quickly process the interrupt request that is to be preferentially processed regardless of the priority. . Furthermore, since the priority is determined by a counter that counts time and software, if there is a high-priority interrupt request during low-priority interrupt processing, the low-priority processing is interrupted and interrupted. High interrupt processing can be executed first.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an interrupt controller showing one embodiment of the present invention.
FIG. 2 is an operation flowchart of an interrupt control method according to an embodiment of the present invention.
[Explanation of symbols]
Reference Signs List 11 interrupt request receiving unit 12 interrupt request counter unit 13 count value comparing unit 14 interrupt processing request / interrupt processing interrupt request generating unit 15 transmission order determination register unit 16 interrupt processing interrupt storage unit

Claims (4)

An interrupt controller for determining a transmission order for each transmission document information block in a facsimile apparatus,
An interrupt request receiving unit that receives an interrupt request for changing the priority of transmission for each block and changing the next priority to the highest priority or the first priority,
A transmission order determination register unit that determines the transmission order according to the order changed for each block having the interrupt request and holds the determined transmission order;
When the transmission order is determined, an initial value of a counter is set, and an interrupt request counter unit that starts an operation of counting a time since an interrupt request is generated;
A count value comparison unit that compares a count value of each block in the interrupt request counter unit, and compares a priority during an interrupt process for changing a subsequent one to a first priority and an interrupt request priority;
An interrupt processing interruption storage unit indicating that preparation for interrupt processing has been interrupted;
An interrupt controller comprising an interrupt processing request or a generating section for generating an interrupt processing interrupt request based on the contents of the count value comparing section, the transmission order determining register section, and the interrupt processing interrupt storage section. An interrupt control method for determining a transmission order for each transmission document information block in a facsimile apparatus,
When an interrupt request for changing the priority of transmission for each block and changing the next priority to the highest priority or the highest priority is received, the processing order of the interrupt request is set by software, and the interrupt request is generated. Set the same initial value to the counter that counts the time since the start, and start counting,
Next, if there is an interrupt process that changes the next-priority one that is about to start processing to the first one, and an interrupt request with a higher priority is accepted, the interrupt request processing order is changed and interrupt processing is performed. An interrupt control method characterized by starting. An interrupt control method for determining a transmission order for each transmission document information block in a facsimile apparatus,
When an interrupt request for changing the priority of transmission for each block and changing the next highest priority to the highest priority or the highest priority is received, a counter for counting the time from the generation of the interrupt request is received. By setting an initial count value according to the priority of different interrupts, and when the count value becomes equal to or greater than a predetermined value, an interrupt process for changing a rear-order one of each block to a first-order first is started. An interrupt control method characterized by determining an interrupt request to be processed with priority at that time regardless of the priority of the interrupt and starting interrupt processing. An interrupt control method for determining a transmission order for each transmission document information block in a facsimile apparatus,
When an interrupt request to change the priority of transmission for each block and change the next priority to the highest priority or the highest priority is received, determine the transmission order of the interrupt request,
The same count initial value is set for the counter that counts the time from the occurrence of the interrupt request, the count is started, and the higher priority is set during the interrupt processing for changing the higher priority to the higher priority. When an interrupt request is received, if the count value during the interrupt processing is less than a predetermined value, the interrupt processing is interrupted, the interrupt request received later is processed first, and then the interrupted processing is resumed. An interrupt control method characterized by continuing the processing when the value is equal to or more than a predetermined value.

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