JPS59168559A - Data searching circuit - Google Patents

Abstract

PURPOSE:To search a data when it is read by extracting the desired data after searching the data read out of a magnetic disk device during transfer of said data to a host device. CONSTITUTION:The identification code on a specific person to be read out is set to a data store circuit 6 from a host device 1, and at the same time the selection signal is sent to a comparator 7 as well as to a magnetic disk device 2 to actuate them. The personal data of a company are read successively out of the device 2 and transferred to the device 1 via a data shift register 5. The data read out of the device 2 are fed successively to the register 5, and the comparator 7 compares the personal identification codes with each other. Then the comparator 7 delivers the coincidence detection signal to an interruption selecting circuit 8 and an OR circuit 9 when the data having an identification code coincident with that set at the circuit 6 is detected. This detection signal is transmitted to the device 1 in the form of an interruption signal INT.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a data search circuit, and particularly to a VCIP! on INK7ACE! This invention relates to a data search circuit which compares the data being read transferred with the pre-stored data by providing a data comparison circuit for each f, and terminates the read data transfer when they match. .

[Prior art and problems]

Data stored on a magnetic disk is sequentially written in the form of address information and data information. For example, if you want to extract specific personal data from a company's employees.

First, what is the processing device (hereinafter referred to as the host device)?

Employee data is read from the magnetic disk device, read into the main memory, and then the required data of a specific individual is searched. Then, a step of processing is required to extract the data obtained as a result of the search and output it. For this reason, in the past, it took a long time to convey the data after reading it into the main memory, placing a very heavy load on the host device, which had the disadvantage of slowing down data processing.

[Purpose of the invention]

The purpose of the present invention is to improve the above-mentioned drawbacks.

Provided is a data search circuit that searches data read from a magnetic disk device while it is being transferred to a host device, extracts necessary data, and executes the data search when reading data. It is to be.

[Structure of the invention]

To achieve this objective, the data search circuit of the present invention is a 1-HE machine system comprising a processing device and a magnetic disk device, and the data search circuit is arranged on an interface connecting the processing device and the magnetic disk device. In addition, this data search means includes a data holding circuit that holds the search data, a data shift circuit that sequentially shifts small transfer data read from the magnetic disk device and transferred to the child processing device, and and a transfer end instruction signal generation circuit, and when the data to be searched is detected from the i-sent data, the transfer end instruction signal generation circuit outputs a transfer end instruction signal to the magnetic disk device. This feature is characterized in that the read data is output to stop subsequent read data transfer.

[Embodiments of the invention]

An embodiment of the present invention will be described based on FIGS. 1 to 6.

FIG. 1 is an explanatory diagram of the layout of the data search circuit of the present invention;
FIG. 2 is a configuration diagram of an embodiment of the present invention, and FIG. 3 is an explanatory diagram of the operation of the present invention.

In the figure, 1 is a host device, and 2 is a magnetic disk device.

6 is a magnetic disk control device, 4 is a data search circuit, 5 is a magnetic disk controller;
Line data shift and register, 64-1 data contest store circuit, B is a comparison circuit, 8 is an interrupt selection circuit, and 9 is an OR circuit.

The data search circuit 4. is provided on the interface connecting the host device fllt, 1 and the magnetic disk drive 2, and as shown in FIG. 2, the data search circuit 4. Data store circuit 6. Comparison circuit 7゜Interwoven selection circuit 8. It is composed of an OR circuit 9 and the like.

The data shift register 5 is a shift register into which data that can be read from the magnetic disk device 2 and transferred to the host device 1 is successively input and shifted one by one.

The data store circuit 6 is for storing data to be compared, that is, identification data sent from the host device 1. The comparison circuit 7 compares whether the data on the data shift register 5 matches the identification data, and when they match, outputs a match detection signal indicating this.

When the comparator circuit 7 outputs a coincidence detection signal, the interconnected selection port 8 selects it and outputs it as a transfer end signal INT, and also outputs a transfer end signal I from the magnetic disk device 2.
When NT is output, it is output as is. The OR circuit 9 sends a termination control signal TC requesting the magnetic disk device 2 to stop data transfer.
When a match detection signal is output from the comparison circuit 7, it is output as TC via the OR circuit 9, and when a match detection signal is not output from the comparison circuit 7, it is output from the host device. The TC output from 1 is output as is.

However, for the TC output based on the detection signal, the time (number of bytes) until output can be specified if necessary.

Next, referring to FIG. 2, the operation of the present invention will be explained with reference to FIG.

First, an identification code of a specific individual to be read is set in the data store circuit 6 from the host device 1, and a selected select signal is sent to the comparator circuit 7 and the magnetic disk device 2 to put them into operation. The magnetic disk device 2 also sequentially reads data of individuals in the company and transfers it to the host device 1 via the data shift register 5.

Therefore, the data read from the magnetic disk device fj#,2 is input to the data shift register 5KM, and the identification codes thereof are compared in the comparison circuit 7. When data having an identification code matching the identification code set in the data store circuit B is detected, the comparison circuit 7 outputs a match detection signal to the interwoven selection circuit 8 and the OR circuit 9.

The coincidence detection signal outputted to the interwoven selection circuit 8 is transmitted to the host device [1 as an interwoven signal NT, and reports that the desired data has been detected. This data is then input to the host device fFl via the data shift register 5. Further, the coincidence detection signal transmitted to the OR circuit 9 is outputted to the magnetic disk drive 2 as a terminal controller 5 signal TC, and the magnetic disk drive 2 thereby stops data transfer.

In this way, the magnetic disk device 2 prompts the host device 1.
The presence or absence of required data can be detected during data transfer.

If the approximate location of the required data is known in advance, a search start instruction circuit 9, for example, shown by a dotted line in FIG. When the host device R1 issues this search start instruction to the circuit 10, the comparator circuit 7 operates and starts the comparison, so that matching can be detected efficiently.

In addition, information such as whether to start the comparison from the byte after the start of transfer, how many bytes and up to which address to transfer, etc. can be set in the search start instruction circuit 1゛0 as necessary. You can also configure and store it as follows. As a result, the comparison circuit 7 starts the comparison operation when the preset conditions are met, and when they match, the preset conditions are met and the end signal TC is sent.
is sent to the magnetic disk device 2, and an interwoven signal IN is sent to the magnetic disk device 2.
The end status content sent with T is changed into a search completion report and sent to the host device 1.

By the way, in the system shown in FIG. 1, the command execution time chart is shown in the states shown in FIGS. 3(A) to 3(W).

i.e. command set first, 9 then data 4
In order to read the data, parameters (cylinder, head, sector, etc.) are sent to the magnetic disk, and as a result, read data is transferred as shown in Figure 3 (c), and as shown in Figure 3 (g). The termination status will be transferred accordingly. Then, as shown in FIG. 3 (e), the command set and the PC signal BUSY indicating the execution of the command.
is output, as shown in (g) K, 'Atenn Yon ATN' is outputted to report the transfer of read data, and as shown in (g), a transfer signal is output together with the data transfer. When the transfer of read data is completed, this is sent from the magnetic disk device 2 to the host device 1 as an interface signal IN.
T is what is output.

However, as described in detail with reference to FIG. 2, when the data search circuit 4 operates and the necessary data is detected,
A coincidence signal is output as shown in FIG. As a result, 6 '1' C is transmitted to the wrinkles by the magnetic disk 1 device 2 Machiyama.9. Further, the magnetic disk device 2 sends out an interlaced signal INT shown by a dotted line. Along with this interwoven signal, an end status signal is also transferred, as shown by the dotted line in FIG. Become.

〔Effect of the invention〕

- In this way, according to the present invention, necessary data can be detected during data transfer and the preceding and following data can be sent to the main memory of the host device, so that the data can be handled immediately on the host device side. It becomes possible.

Able to perform efficient data processing.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the layout of the data search circuit of the present invention;
FIG. 2 is a configuration diagram of an embodiment of the present invention, and FIG. 3 is an explanatory diagram of the operation of the present invention. In the figure, 1 is a host device, and 2 is a magnetic disk device. 3 is a magnetic disk control device, 4 is a data search circuit, 5 is a magnetic disk controller;
is a data shift register, 6 is a data store circuit, 7 is a comparison path, 8 is an interrupt selection circuit, and 9-digit OR circuit. Patent applicant Fujitsu Ltd. Representative Patent Attorney Akira Yamatani 516-: 8. ceremony and ceremony

Claims (1)

[Claims] A computer system equipped with a processing device and a magnetic disk device, wherein data search means is arranged on an interface connecting the processing device and the magnetic disk device,
This data search method. a data holding circuit that holds search data, a data shift circuit that shifts the transfer data read from the magnetic disk device and transferred to the processing device 111 times, and a data comparison circuit that compares the search data and the transfer data. , a transfer end instruction signal generation circuit is configured, and when the data to be searched is detected from the transferred data, the transfer end instruction signal generation circuit outputs a transfer end instruction signal to the magnetic disk device to stop further read data transfer. A data search circuit characterized in that: