JPS6314261A - Microprogram controller - Google Patents

Abstract

PURPOSE:To send back a response within a determined time by issuing a time- out signal to make the priority level of start higher than priority levels of the other factors if a microprogram cannot be started within a certain time. CONSTITUTION:An inter-device communication means 1 detects communication data from a bus 100 to transmit a reception signal 12. The signal 12 starts a timer 2 to set a communication reception factor flag 301-4. A microprogram (MP) starting means 302 accepts and processes MP start factors in accordance with priority level. When the means 302 accepts a communication reception factor to start a communication processing MP, the timer 2 is stopped by an MP start signal 33 from an MP start display means 303, and the flag 301-4 is reset to perform the communication processing, and transmission data is transmitted by the means 1. If the timer 2 issues a time-out signal 21, the output of the flag 301-4 is set to the input of the highest priority level by a priority level changing means 304 and is processed immediately after the termination of the current processing.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a microprogram control device that enables inter-device communication, and particularly relates to a remedy when a communication from another device cannot be responded to within a certain period of time. .

[Conventional technology]

Conventionally, inter-device communication is composed of a plurality of processing devices, including at least one microprogram-controlled processing device, as shown in FIG. 2, and performs a unified operation as a system. Some are targeted at simple communications for purposes such as synchronization.

In the case of communication between the processing device a and the microprogram-controlled processing device 2 in FIG. 2, in conventional devices of this type, this was generally realized by the operation shown in the flowchart of FIG. That is, the processing device a, which is the originating side, abnormally interrupts communication processing when no response is received after a certain period of time has elapsed.

[Problem that the invention seeks to solve]

In the conventional microprogram control device described above, it is possible to return communication as a response within a certain period of time from the time the microprogram is started by receiving communication between devices, but even if the device is normal, it is possible to return communication as a response with higher priority. The time from communication reception to microprogram activation cannot be guaranteed because a high-level microprogram is activated or is being processed, and the other device (processing device a in Figure 2) interrupts communication processing due to a timeout. (Y branch of step 46 in FIG. 3) There is a problem that a contradiction arises in that the microprogram is activated and the communication as a response is returned to the other party.

[Means for solving problems]

The microprogram control device of the present invention includes an inter-device communication means capable of communicating between two or more devices, and a communication reception factor flag that is set when the inter-device communication means receives a communication addressed to the own device. , microprogram activation means for activating a corresponding microprogram by a microprogram activation factor including the communication reception factor flag, and microprogram activation display means for indicating that a corresponding specific microprogram has been activated by the communication reception factor flag. a timer that is activated when receiving a communication addressed to the own device, is stopped by the microprogram activation display means when the specific microprogram is activated, and generates a timeout signal when a predetermined period of time has elapsed without stopping after activation; and the timer; and a priority changing means for increasing the startup priority of the microprogram corresponding to the communication reception factor flag based on a signal.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. The microprogram control device shown in FIG. 1 is connected to other devices via a bus 100, and transmits received data 11 and received signals 12 through inter-device communication reception from other devices, and also transmits data 31 and signals 32. The inter-device communication means 1 transmits data 31, starts after being reset by the received signal 12, stops by the microprogram start signal 33, and generates a timeout signal 21 when a predetermined time elapses without stopping after starting. Timer 2
and a communication reception factor flag 301-4, which has a bus for receiving data 11 and sending data 31 for transmitting and receiving data between the internal arithmetic unit and the internal arithmetic unit, and sets the receiving signal 12 as one of the microprogram starting factors. , a microprogram activation display means 303 that generates a microprogram activation signal 33 when the microprogram is activated by the communication reception cause flag 301-4, and a communication reception cause flag 3.
One of the microprogram activation factors including 01-4 is returned according to the priority order, and the priority of the communication reception factor is raised by the microprogram activation means 302 that activates the corresponding microprogram and the timeout signal 21 from the timer 2. The microprogram control section 3 includes a priority change means 304 that performs preferential communication processing.

FIG. 4 is a detailed block diagram of the inter-device communication means 1 shown in FIG. The inter-device communication means 1 in FIG. 4 includes a communication reception flip-flop 101 for setting a communication request signal from the bus 100, a communication register 102 for setting communication data from the bus 100 in response to the communication request signal, and a transmission data 3.
1 and the output of the code generator 104 to send communication data to the bus 100;
The transmission signal 32 controls the transmission selector 103 to send the transmission data 31 to the bus 100, and also controls the transmission data 31 to the bus 100.
a communication control circuit 105 that sends a communication request signal to 00;
A code generation unit 104 that generates a predetermined communication code based on hardware control or instructions from microinstructions, a comparator 106 that compares a part of the communication data set in the communication register 102 with its own device number, and a comparator 106
and an AND circuit 107 for transmitting the received signal 12 when the destination device number in the communication data shown in FIG. 5 matches the own device number by the output of .

Here, the format of the communication data sent and received via the bus 100 by the communication register 102 and the transmission selector 103 is as shown in FIG.
It consists of a communication code, and communication is performed using a predetermined device number for device identification between communicating devices.

Therefore, when receiving a communication, the destination device number is compared with the own device number of each device, and only the communication addressed to itself is accepted, and when responding to communication from another device, the source device number of the received data is sent. By using this as the data destination device number, communication can be reliably returned to the other party.

Also, the own device number is entered as the source device number of the communication data at the time of transmission.

FIG. 6 is a detailed block diagram of the microprogram control unit 3 shown in FIG. 1. The microprogram control unit 3 in FIG. This is a control unit of a general microprogram control device of a type that selects one of the microprogram activation factors according to a predetermined priority order and activates the corresponding microprogram if there are microprogram activation factors by issuing a microinstruction. This microprogram control unit includes a group of flip-flops 301-1 to 301- that can be reset by a microinstruction for registering a microprogram activation factor.
5, an encoder 305 that selects one of the activation factors according to priority, a sequence control logic 306 that determines the next execution address of the microprogram according to instructions from the microinstruction, and a control memory address that indicates the current execution address of the microprogram. A register 307, a control memory 308 for storing a microprogram, a microinstruction register 309 for storing a microinstruction word read from the control memory 308 according to the contents of the control memory address register 307, and a microinstruction register 309 for decoding a part of the microinstruction. It is comprised of a decoder 310 for instructing each section, and an arithmetic section 311 that transfers data from inside and outside the control section, performs arithmetic and logical operations, and includes general-purpose registers, scratch pad memory, etc.

Here, the microprogram starting means 302 shown in FIG.
is realized by the encoder 305 and the order control logic 306, and the microprogram display means 30B issues a microinstruction that instructs the timer 2 to stop using the microprogram stored in the control memory 308. The changing means 304 is realized by using the timeout signal 21 from the timer 2 to open the gate of the AND circuit 312 and connecting its output to the highest priority input terminal of the encoder 305.

The operation in this embodiment is shown in FIGS. 7(a) and 7(b).

This is shown in the flowchart in (c).

The inter-device communication means 1 sets the communication data from the bus 100 in the communication register 102, detects by the comparator 106 that the communication is to its own device, opens the gate of the AND circuit 107, and sends out the reception signal 12. (Step 71>. The received signal 12 resets and starts the timer 2 and sets the communication reception factor flag 301-4 (Step 7
2).

The microprogram starting means 302 accepts and processes the microprogram starting factors according to the priority order, but processing of the communication reception factor is made to wait until the priority of the factor becomes the highest priority (step 7B, loop of 74.degree. 78).

When the microprogram starting means 302 receives the communication reception factor and starts the communication processing microprogram (YES branch of step 74 → step 75), the microprogram starting signal 33 is supplied from the microprogram starting display means 303 to the timer 2. 76), timer 2
is stopped (step 77) and the communication reception factor flag 301-4 is reset (step 80), and communication processing is performed (steps 81, 82, 83), and the transmission data is sent by the inter-device communication means 1 (step 84). .

When the waiting time becomes longer in the loop of steps 73, 74, and 78, and the timer 2 generates a timeout signal, the YB6 technique of step 78), the priority change means 304
The timeout signal 21 opens the AND circuit 312 and the output of the communication reception factor flag 301-4 is output to the encoder 30.
5, the highest priority input is entered (step 7), and after the microprogram currently being processed is finished (step 87 → YB6 technique of step 86), the highest priority microprogram is started immediately (step 88) and the corresponding communication processing is performed. (Steps 80 to 85). By limiting the processing time of the microprogram processed in Step 87 at the design stage, the time from timeout to return of a communication response can be guaranteed.

As described above, in this embodiment, when a process is not performed even after a certain period of time has passed after receiving a communication, the priority of the process can be changed to give priority to other processes, and the process can be performed and a communication response can be made.

〔Effect of the invention〕

As explained above, the present invention starts when a communication addressed to the device is received, stops when a microprogram is activated by a communication factor flag within a certain period of time, and times out if the microprogram cannot be activated within a certain period of time. It has a timer that generates a time-out signal, and the time-out signal makes the startup priority of the microprogram corresponding to the communication reception factor flag higher than the priority of the existing factors, giving it high priority during normal times. This has the advantage of being able to process without affecting the processing of other processes, and ensure that responses are returned within a predetermined time even when high-priority processes are performed consecutively.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram of inter-device communication, FIG. 3 is a flowchart showing the operation when performing inter-device communication in a conventional device, and FIG.
The figure is a detailed block diagram of the inter-device communication means in Figure 1, Figure 5 is a data format diagram of communication data used in the embodiment shown in Figures 1 and 4, and Figure 6 is a diagram of the micro Detailed block diagram of the program control section, Figure 7 (
a>, (b), and (c) are flowcharts showing the operation of this embodiment. DESCRIPTION OF SYMBOLS 1... Inter-device communication means, 2... Timer, 3... Microprogram control unit, 11... Received data, 12
...Received signal, 21...Timeout signal, 31.
... Transmission data, 32... Transmission signal, 33... Microprogram start signal, 41-50. 71-88...
・Flowchart step, 100...Bus, 10
DESCRIPTION OF SYMBOLS 1... Communication reception flip-flop, 102... Communication register, 103... Transmission register, 103... Transmission selector, 104... Code generation section, 105...
Communication control circuit, 106... comparator, 107... AN
D circuit, 301-1 to 301-5...Flip-flop group, 301-4...Communication reception factor flag, 302.
...Microprogram starting means, 303...Microprogram starting display means, 304...Priority changing means, 305...Encoder, 306...Order control logic, 307...Control memory address register, 3
08... Control memory, 309... Micro instruction register, 310... Decoder, 311... Arithmetic unit, 3
12...AND circuit, a, b, c... processing device. 7-, 7-1-Yago 21 茅ψ圀千田 V Box zuY7 diagram (phantom ¥7121 (shi)

Claims (1)

[Claims] An inter-device communication means capable of communicating between two or more devices, a communication reception factor flag that is set when the inter-device communication means receives communication addressed to the device itself, and a microcontroller including the communication reception factor flag. microprogram activation means for activating a corresponding microprogram according to a program activation factor; microprogram activation display means for indicating that a corresponding specific microprogram has been activated according to the communication reception cause flag; and reception of communication addressed to the own device. a timer that is activated at the time of activation, is stopped by the microprogram activation display means when the specific microprogram is activated, and generates a timeout signal when a certain period of time has elapsed without stopping after activation, and the timeout signal corresponds to the communication reception factor flag. A microprogram control device comprising: priority changing means for increasing the startup priority of a microprogram.