JPS6048793B2 - input/output control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an input/output control device, and more particularly to an input/output control device for controlling data transmission that includes control information at the beginning of transmission information.

In conventional input/output control devices, the storage circuit cannot perform write and read operations at the same time, so all transmission information input from the external circuit is stored, including the control information at the beginning and the data that follows. After all transmission information has been stored in the circuit, the microprogram control circuit first takes in the control information from the storage circuit and decodes the control information to determine the type of input data and errors. It was necessary to perform input/output control processing such as the following, and then perform data processing that is the processing of this input data.

Therefore, the conventional input/output control device processes the control information while inputting the transmission information, even though the control information at the beginning of the transmission information is stored in the storage circuit at the beginning of data transmission. , input/output control processing cannot be performed, and input/output control processing is performed only after transmission of transmission information including all input data is completed.

Therefore, even if the input data is unnecessary, it cannot be determined whether the data is unnecessary or not until all data has been input. In some cases, the processing time for input/output control was wasted as the data could not be discarded.

Furthermore, with conventional input/output control devices, even if data is required, input/output control processing is performed after waiting for the transmission of information to be completed, and then data processing is performed, which takes time for microprogram processing. There were flaws.

SUMMARY OF THE INVENTION An object of the present invention is to provide an input/output control device that can shorten microprogram processing time.

That is, an object of the present invention is to provide a first-in, first-out memory in addition to a data storage memory circuit for input data discrimination and input/output control processing, and to store the leading portion of transmission information including control information in the first-in, first-out memory. Instead of waiting for all data to be stored in the memory circuit, the control information is loaded into the microprogram control circuit when storage in the first-in, first-out memory is completed, and input operations such as data input operations and data type determination are performed. An object of the present invention is to provide an input/output control device that reduces data input/output processing time by performing output control processing simultaneously and in parallel.

The input/output control device of the present invention includes an address counter that stores address information, and a memory that stores transmission information that is supplied from an external circuit and consists of control information and subsequent data at a storage location indicated by the address information. a first-in, first-out memory that stores at least the control information in parallel with the storage of the control information into the storage circuit and generates a control information input completion signal when the storage of the control information is completed; and a microprogram control circuit that starts control processing and starts data processing when a transmission completion signal is supplied when the external circuit completes supply of the transmission information to the storage circuit. .

That is, the input/output control device of the present invention includes a first-in first-out memory, a storage circuit, an address counter that indicates the address thereof, and a microprogram control circuit,
Control information is inputted from an external circuit at the beginning, followed by transmission information including data, which is stored in a storage circuit, and at least the beginning of a part of the transmission information including control information is stored in a first-in, first-out memory. However, without waiting for the input data to be stored in the storage circuit, the control information stored in the first-in, first-out memory is taken into the microprogram control circuit and inputted when the first part of the transmission information is completely stored in the first-in, first-out memory. It performs input/output control processing such as determining data types and errors, and is configured to shorten data input/output processing time.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.
The input/output control device 1 shown in the figure includes a first-in, first-out memory 11
, a memory circuit 12 , an address counter 13 , and a microprogram control circuit 14 , and an external circuit 2
Transmission information consisting of control information and data is supplied to the first-in-first-out memory 11 and the storage circuit 12 via a data line 21, and control signals are sent to the microprogram control circuit 14 via a control line 22.

The first-in, first-out memory 11 and the microprogram control circuit 14 are connected by a data line 23 from the first-in, first-out memory 11 and a control line 24 from the microprogram control circuit 14. is supplied. The address counter 13 is controlled by the microprogram control circuit 14 through a control line 26.
and the memory circuit 12 are connected by an address line 27. Transmission information including the control information inputted from the external circuit 2 at its head portion is stored in the first-in, first-out memory 11 and the storage circuit 12 through the data line 21.

Note that the first-in, first-out memory 11 has a size sufficient to store control information included in the leading portion of transmission information. The transmission information input from the external circuit 2 is all stored in the storage circuit 12 together with the data including control information, but the first part of the transmission information including the control information is stored in the first-in first-out memory 11, and the first-in first-out memory 11 is full. Once that happens, no further transmission information will be stored. When the first-in, first-out memory 11 notifies the microprogram control circuit 14 that it is full, the microprogram control circuit 14 takes in control information from the first-in, first-out memory 11 through the data line 23 and begins decoding the control information. At this time, the memory circuit 12 is in the middle of storing data, but the microprogram control circuit 14 performs input/output control processing separately from data input. Here, if it turns out that the data being input to the memory circuit 12 is unnecessary, the data input is stopped without waiting for the data input to be completed,
The microprogram control circuit can perform the following processing.

Furthermore, even if the input data is necessary, the microprogram control circuit 14 can immediately process the data when it learns that data input has been completed. In the input/output control device of the present invention, by adding a first-in, first-out memory, the microprogram control circuit can perform input/output control processing in parallel with data storage in the storage circuit. Since the processing time for control processing can be started earlier, there is an effect that the processing time for the microprogram can be shortened.

That is, the input/output control device of the present invention is composed of a first-in first-out memory, a storage circuit, an address counter, and a microprogram control circuit, and transmits transmission information including control information at the head portion input from an external circuit. At the same time as storing in the memory circuit, the leading part of the transmission information including control information is stored in the first-in, first-out memory, and the microprogram control circuit performs input/output control processing such as decoding the control information in parallel with the data input operation. ,
This has the effect of shortening the zeta input/output processing time.

That is, the input/output control device of the present invention has the effect of shortening the processing time of a microprogram by providing a first-in, first-out memory for storing control information in addition to a storage circuit for storing data.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1...Input/output control device, 2...External circuit, 11...First-in first-out memory, 12...
... Memory circuit, 13 ... Address counter, 14 ... Microprogram control circuit, 21
...Data line, 22...Control line, 23
...Data line, 24...Control line, 25
...Data line, 26...Control line, 27
...Address line, 28...Control line.

Claims (1)

[Claims] 1: an address counter that stores address information; a storage circuit that stores transmission information that is supplied from an external circuit to a storage location indicated by the address information and includes control information and subsequent data; and a storage circuit that stores at least the control information. a first-in, first-out memory that stores the control information in parallel with storage in the storage circuit and generates a control information input completion signal when storage of the control information is completed; and starts input/output control processing when the control information input completion signal is supplied. and a microprogram control circuit that starts data processing when a transmission completion signal is supplied when the external circuit completes supplying the transmission information to the storage circuit. Control device.