JPH04191949A - High speed command chain control system - Google Patents

Abstract

PURPOSE:To stabilize the performance of a BC system procedure by selecting a device number so as to implement a command chained between 1st and 2nd command storage areas. CONSTITUTION:A command chain means 4 confirms command chain and stores a command to 1st and 2nd command storage areas 71, 72 and selects a device number to process the command in a couple of the 1st and 2nd command storage areas 71, 72. Since the chained command is pre-fetched, it is not required to arise a new input output interrupt to an information processor 1. Thus, the performance of the BC system procedure is made stable without being affected by a bus load and a load of a communication controller 2 due to line multiplex operation.

Description

[Detailed Description of the Invention] [Summary] Regarding the processing method for chained commands during BC procedures that perform half-duplex communication, by increasing the speed of the command chain, it is possible to reduce the load on the bus and the multiple operations on the line. For the purpose of stabilizing the performance of BC procedures without being affected by the load on the communication control device, the communication control device connected to the information processing device via a bus is
When the information processing device (1) executes a command for the machine number used during the BC procedure for half-duplex communication, confirm that the command is chained, and then execute the command during the BC procedure for half-duplex communication. Store it in the first command storage area of
Store the chained commands in the second command storage area of the machine number that is not used in the BC procedure, switch the machine number, and process the chained commands in the first command storage area and the second command storage area. Configure it to do so.

[Industrial application field]

The present invention relates to a control method for a communication control device connected to an information processing device, and particularly to a method for processing chained commands during a BC procedure for half-duplex communication.

[Prior Art] FIG. 4 shows a processing method for chained commands during a BC procedure for performing conventional half-duplex communication.

In the figure, 1 is an information processing device, 2 is a communication control device connected via a bus 3, and has a microprogram 4. Other communication control devices (not shown) are also connected to the bus 3. The communication control device 2 has a line control area 6 consisting of a memory, and has a line control area 6.
is a pair of control areas 71.7 for storing commands in order to cause the line control device 8 to execute transmission control and reception control.
It has 2. Therefore, a plurality of line control 86M areas 6 are provided in order to correspond to a plurality of lines 5, but they are omitted from illustration for one line in FIG. Furthermore, a machine number is assigned to each line. Communication is performed for each line under the control of the microprogram 4 by giving instructions to the machine number from the information processing device 1.

Generally, there are two types of communication: full-duplex communication and half-duplex communication. A.C.
When performing full-duplex communication such as system procedures, the transmission control section and reception control section operate independently, and the line control area 6
Transmission and reception are controlled by control areas 71 and 72 in . Further, the information processing device 1 assigns machine numbers (for example, machine number 01 and machine number 1 in FIG. 1) to the transmitting side and the receiving side and instructs them to perform an operation.

However, since the BC procedure is half-duplex communication, it is necessary to operate transmission control and reception control alternately.

For this reason, control is performed only in the control area 71 of the line control area 6. Therefore, the information processing device 1 instructs only one machine number (machine number 0). The microprogram 4 of the communication control device 2, which has started operating in response to a startup instruction from the information processing device 1, fetches the first command from the information processing device 1 via the bus 3, and at the same time pays the line fee? The command is stored in the control area 71 corresponding to machine number 0 of the il area 6, and the command is analyzed and processed. When the processing of the first command is completed, the command chain (when one input/output operation is completed, the next command is automatically retrieved without causing an input/output interrupt to the information processing device 1, and If a function for starting a new input/output operation is to be performed, the next command is pre-fetched via the bus 3 and the same processing is performed.

In addition, in the microprogram 4 of the communication control device 2, in order to operate multiple lines, the operation priority level is changed depending on the control content and interrupt control is performed to prevent one line from occupying the communication control bag W2. There is. For example, during normal operation, interrupts from the line control device 8 have the highest operational priority level, followed by timer interrupts, etc., followed by command fetch processing via the bus, etc. The lowest level is the operation level caused by waiting for commands and interrupts.

[Problem to be solved by the invention]

In the above, during a command chain, the exclusive use of the lotus 3 may conflict with other communication control devices, and the command fetch may be forced to wait. Alternatively, when multiple lines are in operation, if an operation with a higher priority level than the command fetch operation level is frequently executed, a delay will occur in the command chain. At this time, the problem arises in the command chain from the WRITE command to the READ command. That is, in response to a transmission based on a WRI TE command from the communication control device 2 to a partner terminal (not shown) connected to the line 5, if the response from the partner terminal is very fast, an information processing bag is required to read the response. Since a READ command from f1 is required, if there is a delay in the command chain, the reception may not be in time.

Therefore, the present invention solves this problem (by increasing the speed of the command chain, the BC procedure can be performed without being affected by the load on the communication control device 2 due to the bus load and multiple line operations). The challenge is to stabilize performance.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

In the figure, 1 is an information processing device, and 2 is a communication control device, which is connected to a plurality of lines 5 and performs data communication.

A bus 3 is a data transfer path between an input/output channel (not shown) of the information processing device 1 and the communication control device 2. 4
71 and 72 are means for controlling communication, and particularly in the present invention are means (microprogram) for performing command chaining. Reference numeral 71 and 72 are areas for storing commands. The command chaining means 4 confirms that the command is chained by activating the command for the machine number in use during the BC procedure for performing half-duplex communication from the information processing device 1, and performs the half-duplex communication of the command. The command is stored in the first command storage area 71 during the BC procedure, and the chained command is stored in the second command storage area 72 of the machine number not used in the BC procedure. Furthermore, the machine number is switched and the commands that are pre-fetched and stored in a pair of command storage areas 7 and 72 are processed.

[Effect]

The command chain means 4 confirms the command chain and stores the first and second command storage areas 71.
Commands are stored in 72, and the commands in the pair of command storage areas 71 and 72 are processed by switching the machine numbers.

Therefore, since the chained commands have been prefetched, it is not necessary to cause a new input/output interrupt to the information processing device 1.

Therefore, it is possible to stabilize the performance of the BC system procedure without being affected by the load on the communication control device 2 due to the bus load and the multiplexed operation of the line.

〔Example〕

FIG. 2 shows an embodiment of the present invention, and FIG. 3 is an operation flowchart of the embodiment of the present invention. The same or similar parts as in FIGS. 1 and 4 are given the same reference numerals.

In the figure, as in FIG. 1, 1 is an information processing device, 2 is a communication control device, which is connected to a plurality of lines 5 and performs data communication, and 3 is a bus, which is an input (not shown) of the information processing device 1. This is a data transfer path between the output channel and the communication control device 2. 20 is a communication control device memory. It includes an area for setting and storing information for operating a microprogram and each line 5.

4 is a microprogram in the communication control device memory 20, which performs communication control; 6 is a line control area 0, which is also in the communication control device memory 20;
is allocated to each line, and includes areas 71 and 72 indicating operation information for each line and a flag area F indicating a command chain. Since the line control area 6 is assigned to each line, there are a plurality of line control areas 6, but only one set is omitted in the figure. 7I and 72 are a pair of line control areas within the line charge m911 area 6, and are assigned different machine numbers. The line control area 71 is an area where transmission and reception are controlled alternately in the BC procedure, and the line control area 72 is an area where B
Is there a machine number system that is not normally used in C procedure? il 914 area. The present invention is characterized in that during half-duplex communication, these pair of line control areas 71 and 72 are used by switching the machine numbers during command chain. Reference numeral 8 denotes a plurality of line control devices provided corresponding to each line.

Next, the operation of the embodiment shown in FIG. 2 will be explained according to the flowchart shown in FIG.

When a command of a specific machine number is activated from the information processing device 1 to the communication control device 2 (step S1), the microprogram 4 fetches the command from the information processing device 1 through the bus 3 (step S2). Next, under the control of the microprogram 4, the command is stored in the first line control area 71 of the line control area 6, which alternately controls transmission and reception according to the BC procedure, and the command is analyzed (step S3). ). As a result of the analysis, if there is a data chain, the next command prefetch is performed (steps S4 and S5). If there is no data chain, determine whether there is a command chain (step S6);
If the command chain is present, the next command prefetch is performed (step S7), and the prefetch command is sent to the other line control area of the line control area 6, which is a machine number system that is not normally used in the BC procedure. It is stored in the I ji Jl area 72 (step S8).

Next, the microprogram 4 receives the line charge j86M area 6.
Sets a flag indicating that it is a command chain in the flag area F of (step 5IO) L, and prepares to enable the command stored in the control area 72 (
Step 5ll).

On the other hand, if it is determined in step S6 that there is no command chain, the chain instruction flag in the flag area F of the line charge meJ area 6 is cleared (step S9).

Next, in step 51, the command stored in the control area 71 is executed whether the command chain is present or not.
2) Start the line control device 8 of the corresponding line and end the command (step S13.314). The state of the flag area F of the line control area 6 is determined, and if the flag is in a clear state, the command is executed. Terminate (step 515)
. If the flag is set and the command is an error, the process ends (step 516).

If there is no error termination of the command, the command in the control area 71 is terminated in normal operation (step 517), and control is switched to the machine number in the control area 72 in which the prefetched command is stored (step 31B). The command chain is executed and the command stored in control area 2 is activated (step 519). From then on, control area 7
Processing similar to the command to store in 1 (steps 312 to 1)
4) is performed.

By terminating the command chain with the machine number for which the activation instruction was given, the information processing device 1 can make it appear as if the command was executed on the machine number that activated it. This eliminates the process of fetching commands via the bus during command chaining, making it possible to speed up the command chain and stabilize performance.

〔effect〕

According to the present invention, even when there is a high load on the bus of the information processing device during data communication or a high load due to line multiplexing operation of the communication control device itself, the command chain of the BC procedure is not delayed and operates with stable performance. I can do it.

[Brief explanation of the drawing]

Figure 1 is a diagram of the principle of the present invention, Figure 2 is an embodiment of the present invention, Figures 3(a) and 3(b) are operational flowcharts of the embodiment of the present invention, and Figure 4 is a conventional example. , are shown respectively. In the figure, 1... Information processing device, 2... Communication control device, 3... Bus, 4... Command chain means (microprogram), 5... Line, 6... Line control 71.72...Command storage area (control area), F...
-Flag area. Figure 1 Figure 2

Claims (3)

[Claims] (1) A command for the machine number used during the BC system procedure for performing half-duplex communication from the information processing device (1) to the communication control device (2) connected to the information processing device (1) via the bus (3). Make sure the command is chained on startup,
The command is stored in the first command storage area (71) for the BC procedure that performs half-duplex communication, and the second command storage area (72) for the machine number where the chained command is not used in the BC procedure. and switch the machine number to the first command storage area (71) and the second command storage area (71).
2) A high-speed command chain control method characterized in that chained commands are processed. (2) Command chain means (4) is connected to the communication control device (2) connected to the information processing device (1) by the bus (3).
) and a line control area (6), and the microprogram (4) is configured to chain commands when the information processing device (1) activates a command for the machine number in use during a BC procedure for half-duplex communication. The command is stored in the command control area (71) during the BC procedure for half-duplex communication in the line control area (6), and the chained command is stored in the line control area (71). By storing the command in the command control area (72) of the machine number that is not used in the BC procedure of (6), and determining the flag indicating that the command has been stored in the command control area (72), the machine number can be switched and the command can be executed. A high-speed command chain control method characterized in that chained commands in a control area (71) and a command control area (72) are processed. (3) A high-speed command chain control system according to claim 1, characterized in that when a command is terminated, the command is terminated with the machine number from which the command was activated.