JPH03194636A - Input/output controller - Google Patents

Abstract

PURPOSE:To improve a processing capacity by executing a command processing at every data transfer, and executing a data transfer processing as to simple I/O at a prescribed period based on a timer signal. CONSTITUTION:A first polling means 1 sequentially polls an input/output device 19 and transfers data to a host device 20 through a transfer means 3. A state means 7 starts a command processing means 6 subsequent to the operation of the transfer means 3 and a storage means 8 stores the machine number of the specified input/output device 19. A second polling means 2 reads the storage means 8 based on a period signal from a generation means 9 and designates the machine number of the specified input/output device 19. Thus, the transfer request of data from the specified input/output device 19 is polled at the prescribed period so as to attain detection.

Description

[Detailed Description of the Invention] [Summary] Regarding an input/output control device that is located between a host device and an input/output device and controls the operation of the input/output device, it efficiently controls various input/output devices including simple input/output devices. A first polling means for sequentially specifying the machine numbers of all connected input/output devices, and data detected during polling. means for transferring data between the input/output device and a higher-level device based on a transfer request from the higher-level device; and a means for storing the machine number of the input/output device when a command to start the input/output device is issued from the higher-level device. An input/output control device having a means for storing a device number in a storage portion, and a command processing device for reading a device number from the storage portion, extracting an input/output command from the host device based on the device number, and transmitting the command to the input/output device. means for activating the command processing means following the operation of the transfer means; means for storing the machine number of a specific input/output device among the input/output devices; and generating a signal at a predetermined period. and second polling means for reading out the storage means and designating the machine number of the specific input/output device based on the signal from the generation means.

[Industrial application field]

The present invention provides an input/output control device (Ilo) that is located between a host device and an input/output device (referred to as Ilo) and controls the operation of Ilo.
(referred to as OC).

In recent years, Ilo's with a wide variety of functions and performances have been used to meet the requirements of computer systems. For example, for a keyboard display that does not have display memory, the data entered by the key by polling is stored in the main memory once.
It is then controlled to output the data from main memory to the display for display. l like this
10 (hereinafter tentatively referred to as simplified type I10), commands are quickly transferred to Ilo in order to prevent overruns and to provide a human-machine interface with an acceptable response time for human input and display. , I
It is necessary to quickly respond to data transfer requests from LO. On the other hand, as a control method for Ilo, the machine numbers of multiple connected Ilo are sequentially changed and sent to specify the device,
Polling-type IOCs are widely used, which inquire whether there is a data transfer request or not, and if there is a request, transfer data between the main memory of the computer system and Ilo. Therefore, various types of I10 to be connected, including the simple type I10.
Polling-type IO that can efficiently control
C is desired.

[Conventional technology]

In conventional polling-based IOCs, while processing such as data transfer and finalization of input/output operations is being performed based on polling requests from the Ilo, the IOC from the host device is
When an instruction is issued (hereinafter referred to as activation) to start the operation of
The machine number of o is temporarily stored in the memory, the current processing is executed, and polling is continued for other requests. When the polling completes one round and reaches the final Ilo, the memory is referenced to obtain the machine number of the activated Ilo, and the command is read from the host device and transferred to the Ilo (hereinafter referred to as
(referred to as command processing) to initiate input/output operations.

[Problem to be solved by the invention]

As mentioned above, according to the conventional method, if it is started from a host device during processing such as data transfer or finalization processing, the Ilo
The machine number is temporarily stored in the memory, the current processing is executed, and when the polling continues and one round is completed, the memory is referred to and the command processing is performed. Here, one Il
If the polling time required for o is a, the total number of connected Ilo is b, the time required for data transfer is C, and the number of data transfer requests generated during one round of polling is d, the time for one round of polling is cXd + aXb So, I
As the number of devices connected to lo increases, d increases, and as a result, the time required for one round of polling increases.

Therefore, the time required from when a certain Ilo is activated until command processing increases, making it impossible to respond quickly to activation, and also unable to quickly detect a data transfer request from an Ilo. In particular, there was a problem that the simplified type I10 could not be controlled satisfactorily.

An object of the present invention is to provide a polling type IOC that can efficiently control various types of I10 including the simple type I10.

[Means to solve the problem] FIG. 1 shows a block diagram of the principle of the present invention.

In the figure, 1 indicates the machine numbers of all connected input/output devices 19 in order,
The designated first polling means 3 is the input/output device 19 based on the data transfer request detected during polling.
means for transferring data between the host device 20 and the host device 20; 5 means for storing the machine number of the input/output device 19 in the storage unit 4 when a command to start the input/output device 19 is issued from the host device 20; 6 reads the machine number from the storage unit 4, retrieves the input/output command from the host device 20 based on the machine number, and sends the input/output device 1 to the relevant input/output device 1.
7 is means for activating the command processing means 6 following the operation of the transfer means 3; 8 is means for storing the machine number of a specific input/output bag W19 in the input/output device 19; 9 is a means for generating a signal at a predetermined period; 2 is a generating means 9;
This is a second polling means that reads out the storage means 8 based on the signal and specifies the machine number of a specific input/output device 19.

[Effect]

According to the present invention, the first polling means 1 sequentially specifies the machine numbers of all the connected input/output devices 19, and the input/output devices 19 are connected based on a data transfer request detected during polling. means 3 for transferring data between the host devices 2o; means 5 for storing the machine number of the input/output device 19 in the storage unit 4 when a command to start the input/output device 19 is issued from the host device 2o; In an input/output control device having a command processing means 6 that reads a machine number from a storage unit 4, retrieves an input/output command from a host device 20 based on the machine number, and transfers it to the input/output device 19, the activation means 7 is a transfer unit. Following the operation of the means 3, the command processing means 6 is activated, the storage means 8 stores the machine number of a specific input/output bag 219 in the input/output device 19, and the generating means 9 generates a signal at a predetermined period. The second polling means 2 polls the storage means 8 based on the signal from the generation means 9.
Since the machine number of the specific input/output device 19 is specified by reading out It becomes possible to poll and detect a data transfer request from the device 19 at a predetermined cycle.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3. The same reference numerals indicate the same objects throughout the figures. Components in FIG. 2 that correspond to those in FIG. 1 are surrounded by dashed lines.

In the block diagram of the embodiment of the present invention shown in FIG. 2, the polling unit 1a normally performs PI (Poll Idle) polling, which repeats and sends out all 11015s while sequentially changing the machine numbers of the connected 11015s. , PI that interrupts polling when polling completes one cycle.
C polling or individual polling that polls only the specified 11015, and the data transfer request R
Inquires about the presence or absence of QD (Request Data) or command termination request DVE (Device End). P S (Poll
When it receives a P E (Poll End) signal, when it completes a poll during PIC polling, or when it polls the last designated 11015 during individual polling, it interrupts polling and outputs a P E (Poll End) signal.

When the command receiving unit 5a receives a command to start the operation of the l1015 from the host device 16 (hereinafter referred to as activation), the command receiving unit 5a verifies the validity of the command and stores the corresponding l1015 in the table 4a.
A signal P that sets a flag in the storage location corresponding to the machine number and requests the polling unit 1a to interrupt polling.
Output S.

Table 4a is a 1-bit/word memory associated with the machine number at memory address 11015, and the bit (flag) at the address corresponding to activated l1015.
is set to 1.

When the disbatch unit 6a receives the PE signal from the polling unit 1a, it refers to the table 4a, sequentially obtains the machine numbers of the activated l1015s, specifies the machine numbers to the command processing unit 6b, and issues a command. Instruct the processing of

The command processing unit 6b reads the command code for the specified l1015 from the main storage device (not shown) of the host device 16 based on the instruction from the dispatch unit 6a, and reads the command code for the specified machine number via the polling unit 1a. 11015 (hereinafter referred to as command processing), and requests the polling unit 1a to perform PIC polling.

When the transfer processing unit 3a receives the RQD signal from the l1015 via the polling unit 1a, the transfer processing unit 3a transfers the RQD signal from the main storage device to the l10.
Controls data transfer between 150 and 150. That is, read data from the main memory and transfer it to 11015°, or l1
The data is read from 015 and stored in the main memory.

When the finalization processing unit 3b receives the DVE signal from the l1015 via the polling unit 1a, it reads the state information (referred to as status) of the command execution result from the l1015, transfers it to the host device 16, and requests PIC polling.

The timer 9a generates a timing signal at regular intervals.

The table 8a is a 1-bit/word memory whose memory address is associated with the machine number 11015, and is 1101 by designation from the host device 16 or by initialization when the power is turned on.
The bit of the address corresponding to simplified type I10 in 015 is set to 1.

Based on the signal from the timer 9a, the individual polling unit 2a refers to the table 8a to obtain the machine number of the simplified type I10, and instructs the polling unit 1a to sequentially poll that machine number (referred to as individual polling). When the final simple type I10 is polled, the dispatch unit 6a is activated.

The operation of this embodiment will be explained with reference to the flowchart in FIG.

(2) The polling unit 1a performs PI, PIC or individual polling.

(2) When activated by the host device 16, the command receiving section 5a sets a flag corresponding to the machine number 11015 in the table 4a, and outputs a PS signal to the polling section 1a.

■When the polling unit 1a receives the PS signal, the PIC
When polling completes one round or when the final simple type I10 is individually polled, polling is interrupted and a PE signal is output.

■The dispatch unit 6a searches for flags in the table 4a, and ■When there are no flags for all l1015, the PI
Request polling, or (2) Perform command processing for all l1015s with flags and request PIC polling.

(2) When receiving an RQD signal from l1015 during polling, transfer control unit 3a transfers data between the main storage device and l1015, and operates dispatch unit 6a.

(2) When a DVE signal is received from 11015 during polling, termination control section 3b receives the status from 11015, transfers it to the main storage, and requests PIC polling.

■Individual polling unit 2 based on the signal from timer 9a
A refers to the table 8a to find the machine number of the simplified model I10, and requests the polling unit 1a to poll the machine number in sequence.

Therefore, each time data transfer is executed, which takes a relatively long time, command processing is performed with reference to the table 4a, and the simple type 1101 is executed at a predetermined period based on the signal from the timer 9a.
5 is configured to perform data transfer.

In this embodiment, an example is shown in which dispatch processing is performed following data transfer, but in addition to data transfer processing, dispatch processing may be performed following finalization processing and command processing.

〔Effect of the invention〕

As explained above, according to the present invention, command processing is performed each time data is transferred, and data transfer processing is performed for the simplified type I10 at predetermined intervals based on a timer signal, so that startup from a host device can be performed quickly. can correspond,
Further, in particular, it is possible to quickly respond to data transfer requests of the simplified type I10, and the processing capacity of the IOC can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram showing an embodiment of the present invention, and FIG. 3 is a flowchart of the embodiment of the present invention. In the figure, 1 is a first polling means, 1a is a polling section, 2 is a second polling means, 2a is an individual polling section, 3 is a transfer means, 3a is a transfer processing section, 3b is a finalization processing section, 4 is a storage 4a, 8a are tables, 5 is a storage means, 5a is a command receiving section, 6 is a command processing means, 6a is a dispatch section, 6b is a command processing section, 7 is a starting means, 8 is a storage means, 9 is a generating means , 9a is a timer, 15.19 is an input/output device (Ilo), and 16.20 is a host device. The book is also the θth Hara Kuri - Fukuchi Nfu Kasumi Figure 1 The book is also the B month f1 real direction hii series pro 77 Figure 2

Claims (1)

[Claims] First polling means (1) that sequentially specifies the device numbers of all connected input/output devices (19), and a first polling means (1) that sequentially specifies the device numbers of all connected input/output devices (19), and means (3) for transferring data between the input/output device (19) and the host device (20); Means (5) stores the machine number of the input/output device (19) in the storage unit (4), reads the machine number from the storage unit (4), and reads the machine number from the storage unit (4), ) and a command processing means (6) for retrieving an input/output command from the input/output device (19) and transmitting the command to the input/output device (19), the command processing means (6)
means (7) for activating a specific input/output device (19) among said input/output devices (19);
); means (9) for generating a signal at a predetermined period; and means (9) for reading out the storage means (8) based on the signal from the generating means (9) to store the specific machine number. An input/output control device comprising: second polling means (2) for specifying a machine number of an input/output device (19).