JPH02118748A - Input output control system - Google Patents

Abstract

PURPOSE:To improve data processing efficiency by means of CPU by performing input output control corresponding to plural commands by means of one start. CONSTITUTION:A CPU 11 outputting plural pieces of block data including length information showing a data length and the commands at once and an input output controller 14 which stores plural pieces of block data that have been outputted from CPU 11 at once fetches block data from plural block data one by one based on length information included in respective block data and which sequentially performs input output control corresponding to the contents of the commands included in the block data are provided. Consequently, the input output controller 14 can be operated independent of CPU 11 while it performs input output control. Thus, time when CPU 11 has to supervise the input output controller 14 can be reduced and the burden of a processing with respect to the input output control of CPU can be reduced, whereby data processing efficiency by CPU can be improved.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention relates to a human output control method (prior art) that performs input/output control according to the contents of command data from a CPU. Control of the output device is performed by an input/output (I10) controller under the control of the CPU.

In other words! The controller 10 receives commands from the CPU and executes input/output control according to the contents of the commands. In this case, if there is data to be transferred, the data transfer is performed following the command processing. and,
When such command processing is completed, the I10 controller notifies the CPU of the completion of the processing, and the CPU
Waits for the next command to be sent.

After passing the command to the I10 controller, the CPU waits for the I10 controller to send a notification that the command processing has ended. When receiving the completion notification, it performs processing to pass the next command to the I10 controller.

In this way, in the conventional input/output control method, I10
It is necessary to start the controller and process the termination notification from the I10 controller for each command. For this reason, the time for the CPU to monitor the I10 controller becomes longer, resulting in a disadvantage that data processing efficiency by the CPU is lowered.

(Problems to be Solved by the Invention) This invention was made in view of the above-mentioned circumstances. Conventionally, the I10 controller was activated for each command, and the I1
Improved the issue of having to perform processing in response to processing completion notifications from the 0 controller, and made it possible to perform human output control in response to multiple commands with a single startup, improving data processing efficiency by the CPU. The purpose is to provide a human output control method that is capable of controlling human output.

[Structure of the Invention] (Means for Solving the Problems) The human output control method according to the present invention includes a CPU that outputs a large number of block data including length information indicating the data length and a command at once, and a A plurality of block data output at one time are stored, and each block is extracted one by one from the plurality of block data based on length information included in each block data, and the block is characterized.

(Function) With this input/output control method, input/output control processing can be executed in accordance with a plurality of command data at once. The input/output control device can operate independently of the CPU while executing input/output control.

Therefore, the time the CPU has to monitor the input/output control device can be reduced. Therefore, C.P.
The processing burden for U input/output control is reduced, and the CPU
This makes it possible to improve data processing efficiency.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a system configuration for realizing an input/output control method according to an embodiment of the present invention. In Figure 1, 1
1 is a CPU that controls the entire system;
The UII is connected to main memory 13 and I10 controller 14 via internal bus 12. The main memory 12 stores various programs and data for executing control operations of the cPU. The I10 controller 14 enters and exits the interior according to instructions from the CPU! 15
Controls the operation of the system, that is, controls input and output.

In this system, CPU II has length information/
Multiple block data of command/data or length information/command as one block can be sent to I10 at once.
Output to the controller 14.

In this case, the length information indicates the data length of each block data. The I10 controller 14 is a CPU II
A plurality of block data (for code) output at one time are stacked in a register or the like. Then, based on the length information included in each block data, block data is extracted one by one from the block data corresponding to the code, and command processing included in the extracted block data is executed.

FIG. 2 shows the data format of the block data for the code stacked in the I10 controller 14. In FIG. 2, length 0/command 0/data O constitutes the first block data, and length n/command n constitutes the nth block data. As you can see from this figure, here the number of bits to represent length information,
The number of bits for representing the data and the command are uniquely determined, and only the number of bits for data is variable in length. Therefore, the data length of block data can be determined even if the length information included in the block data does not indicate the data length of the entire block data, and even if the length information indicates only the number of bits of variable-length data. Can be done.

Next, the input/output control operation of this system will be explained with reference to the flowcharts of FIGS. 3 and 4. First, the third
As shown in the figure, the block data for the code is output from the CPU II at once, and the block data for the code is stored in the I10 controller 14 (
Step Al). Next, the block data is extracted one by one by the (10) controller 14, and processing according to λ is executed in accordance with the contents of the command contained in the extracted block data (step). Then, it is determined whether or not the processing of the block data for the code has been completed (step A3), and if it has not been completed, step A2
The process is repeated.

To determine whether or not the processing of the block data for the code in step A3 has been completed, for example, length information indicating the entire data length of the block data for the code is
This can be executed by outputting from PUII.

The block data retrieval and command processing operations in step A2 include, for example, steps 81 to BB as shown in FIG. That is, first, length information included in the block data is checked in step B1, and it is determined whether the block data includes data other than commands (step B2). If the data does not contain data other than commands, the command is processed in step B3, and then the process in step 83 of FIG. 3 is performed. Furthermore, if the data includes data other than commands, the processes of steps 84 to B6 are performed. That is, first, command processing is performed in step B4, and then data transfer processing is performed in step B5. Then, in step B6, it is determined whether or not the data transfer for one block has been completed. If not, the data transfer process in step B5 is repeated, and if it has been completed, it is determined in step A3 in FIG. processing is performed.

When the human output control process corresponding to the block data corresponding to the code is completed through this series of processes, the I10 controller 14 notifies the CPU II of the completion of the process. Therefore, in this system, I10
The activation of the controller 14 and the processing in response to the notification of completion of processing from the I10 controller need only be performed on a record-by-record basis, rather than on a per-command basis. Therefore, it is possible to reduce the processing load on the CPU It for input/output control, and it is possible to improve the efficiency of data processing by the CPU.

[Effects of the Invention] As described above, according to the present invention, input/output control according to multiple commands can be executed with one startup, and C
The processing load for input/output control by the PU can be reduced. Therefore, it becomes possible to increase the data processing efficiency of the CPU accordingly.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a system configuration for realizing a human output control method according to an embodiment of the present invention, and Fig. 2 explains the data format of block data used in the system shown in Fig. 1. FIGS. 3 and 4 are flowcharts for explaining input/output control operations of the system shown in FIG. 1, respectively. 11...CPU, 12...Internal bus, 13...Main memory, 14...I10 controller, 15...
・I/O device. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] A CPU that outputs multiple pieces of block data including length information indicating data length and commands at once;
Stores multiple block data output at once from
an input/output control device that extracts block data one by one from the plurality of block data based on length information included in each block data and sequentially executes input/output control according to the contents of commands included in the block data; An input/output control method characterized by comprising: