JPS62186628A - Data transfer system - Google Patents

Abstract

PURPOSE:To reduce the overhead of a host device in a LAN system by providing a time supervisory section started after the end of transfer of device information to a data transfer device. CONSTITUTION:In replying its own device information (ID information) sent from a host device 3-n to an opposite device 3-n as reply information, a time supervisory section 8 started after the end of transfer of ID information is provided. When the ID information is received again from the opposite device 3-n within the time supervision at the supervisory section 8, the interruption to the host device 3-n is suppressed and the ID information reply from a transmission/reception buffer 5 is transferred to the opposite device 301 is the data transfer device 2-n. Thus, the data transfer device 2-n can reply the host device without interruption at the retrial of the ID information to reduce the overhead of the host-device.

Description

[Detailed Description of the Invention] [Summary] In a data transfer device (data transfer adapter) that transfers data between multiple devices, when exchanging device information @1 (ID information) prior to data transfer, When receiving the device information (ID information) from the device, interrupting the host device, and returning the own device information (In information) obtained from the host device as response information to the partner device, the device information (ID information) By providing a time monitoring unit that starts at the same time as the response of the other device, device information (ID
In response to an information request, an interrupt to a higher-level device is suppressed, and the own data transfer device retransmits its own device information (ID information).

[Industrial application field]

The present invention relates to a data transfer method in a LAN system, and particularly to a method for exchanging device information (ID information) prior to data transfer in a data transfer device (data transfer adapter) that transfers data between a plurality of devices. .

With the recent improvement in the performance of computer systems, a so-called local near network (hereinafter referred to as (called LAN)
System construction is becoming more popular.

Conventionally, in the LAN system, data transfer between devices was performed by connecting only devices of the same model to the common bus, so once a bus between arbitrary devices was determined, data transfer could be performed immediately. I was able to do it.

However, with the recent increase in the types of computer systems, it has become necessary to connect different types of devices to the aforementioned common bus to construct a more flexible LAN system.

In this case, after a bus is determined between certain devices, it is necessary to exchange device information (ID information) with each other and perform data transfer using a protocol that is compatible with the device model. A method of exchanging information is required.

[Prior art and problems to be solved by the invention] FIG. 3 is a diagram illustrating a conventional IDH information exchange system.
(a) shows the system configuration, and (b) schematically shows 10 information exchange methods.

The LAN system consists of a common bus,
1 multiple data transfer devices (data transfer adapter)
2-1.2-2.2-3. ... are connected, and each data transfer device is connected to a host device 3-1.
3-2.3-3. - are connected, and the data transfer adapters 2-1.2-2.2-3.・- Data transfer between each device is performed via.

At this time, after a data transfer bus is determined between certain devices, the devices function to exchange device information (ID information) with each other and perform data transfer using a protocol suitable for each device model.

In the conventional system, this exchange of device information (ID information) is performed using a certain data transfer adapter 2 as shown in Figure (b).
When -1 receives the device information (ID information) ■ from the data transfer adapter 2-3 of the communication partner, it issues an interrupt ■ to the host device 3-1 and sends its own device information (ID information) from the host device 3-1.
After obtaining the device information III (ID information), a device information (ID information) response ■ is sent to the other party's data transfer adapter 2-3 via the common bus 1, and a series of device information ( ID information) exchange sequence has been completed.

If the data transfer adapter 2-3 of the other device cannot receive the response signal within a certain period of time, it retransmits the same device information (ID information) and sends the device information (ID information) again.
The data transfer adapter 2-1 waits for the response of the device information (ID information) and receives the retransmitted device information (ID information).The data transfer adapter 2-1 interrupts the host device 3-1 in the same manner as its predecessor.

Therefore, in the conventional system, there is a problem in that the overhead associated with exchanging the device information (ID information) in the host device becomes large.

In view of the above-mentioned conventional drawbacks, the present invention provides device information (I) between devices that is performed prior to data transfer in a LAN system.
The purpose of this invention is to provide a method for reducing the overhead at each device in exchanging information (D).

[Means for solving problems]

FIG. 1 is a block diagram showing one embodiment of the present invention.

In the present invention, multiple devices! In a data transfer device 2-n that transfers data between devices 3-n, when exchanging device information (ID information) prior to the data transfer, the device information (ID information) is sent from the other device 3-n. When the host device 3-n receives the host device 3-n, it interrupts the host device 3-n and sends the own device information (ID information) sent from the host device 3-n to the other device 3-n.
A time monitoring unit 8 is provided that starts after the transfer of the device information (ID information) is completed, and during the time monitoring by the time monitoring unit 8, the device information is sent back as response information from the other device 3-n. When information (ID information) is received, interrupts to the higher-level device 3-n are suppressed, and the data transfer device 2
-n, the own device information (I
n information) is configured to transfer the response to the partner device 3-n.

[Effect]

That is, according to the present invention, in a data transfer device (data transfer adapter) that transfers data between a plurality of devices,
When exchanging device information (ID information) prior to data transfer, the device information II (ID information) is received from the other device, interrupts the host device, and own device information (ID information) obtained from the host device By providing a time monitoring unit that starts at the same time as the response of the device information (ID information) when the device information (ID information) is returned to the partner device as response information, it is possible to On the other hand, since the data transfer device suppresses interrupts to the host device and resends its own device information (ID information), the data transfer device transmits the device information (ID information) to the host device when trying to transfer the device information (ID information). It is possible to respond without interrupting (response), which has the effect of reducing overhead in the host device.

〔Example〕

Embodiments of the present invention will be explained in detail below with reference to the drawings.

The above-mentioned FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram schematically showing an ID information exchange method according to the present invention. 8.
and related mechanisms are the functional blocks necessary to implement the present invention. Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 1, a data transfer device (data transfer adapter) 2-n exists between a host device 3-n and a common lotus 1, and performs data transfer with a communication partner.

The transmitting/receiving section 4 takes in a frame addressed to itself on the common bus 1 and transfers it to the transmitting/receiving buffer 5, or transmits data in the transmitting/receiving buffer 5 to the common bus 1 according to instructions from the common control section 6.

The higher-level IF section 7 controls data transfer with the higher-level device 3-n according to instructions from the common control section 6.

The common control unit 6 functions to issue an interrupt to the higher-level device 3-n when receiving device information (ID information) from a communication partner.

Thereafter, after receiving its own device information (ID information) from the host device 3-n, the common control section 6 transmits information on the common bus 1,
A response of the device information (Ill information) is sent and the host device 3
-n is notified of the end of the device information (ID information) exchange sequence, and the time monitoring unit 8 is activated.

At this time, the device information (ID information) is saved in the transmission/reception buffer 5.

While the time monitoring unit 8 is monitoring the time, the common control unit 6 receives a request for device information (ID information) from the communication partner again (i.e., a retry request because the response could not be received in the partner device). If there is, the host device 3-n
In addition to suppressing interrupts to, the device information (ID information) stored in the transmission/reception buffer 5 is
It operates so as to retransmit it to the common bus 1 via the transmitting/receiving section 4.

Also, in the time monitoring section 8, during time monitoring, a different sequence (for example, normal data transfer) is received from the partner device.
Alternatively, when there is an instruction from the host device 3-n, the common control unit 6 functions to cancel activation of the time monitoring unit 8 and start the new sequence operation.

FIG. 2 schematically shows the ID information exchange operation according to the present invention, where ■ indicates reception of device information (ID information) from the partner device, and ■ indicates the reception of device information (ID information) from the host device 3-n. Indicates an interrupt, ■ indicates the reception of own device information (ID information) from the host device 3-r+, and ■ indicates a response operation to the partner device.

In the present invention, at this point, the time monitoring unit 8 is activated as shown by ■, and when the time monitoring unit 8 receives the device information (ID information) connection try request shown by ■ while monitoring the time, Interruption to the host device 3-n is suppressed, and the own data transfer device 2-n responds (■).

As described above, the present invention provides a data transfer device that transfers data between a plurality of devices, receives device information (ID information) from a partner device, interrupts a host device, and transmits data from the host device to its own device. When obtaining the information (ID information) and responding to the partner device, the time monitoring unit is activated, and when the time monitoring unit receives a device information (ID information) request again while monitoring the time, the host device The feature is that interrupts are suppressed and responses are made within the data transfer device.

〔Effect of the invention〕

As described above in detail, the data transfer method of the present invention is such that a data transfer device (data transfer adapter) that transfers data between multiple devices transmits device information ([0 information) prior to data transfer. When exchanging, when receiving the device information (ID information) from the partner device, interrupting the host device, and returning the own device information (In information) obtained from the host device to the partner device as response information, Device information (In
By providing a time monitoring unit that starts up at the same time as the response to the device information (information), the device information (I
In response to a request (Offl), interrupts to the higher-level device are suppressed, and the data transfer device transmits own device information (I
Since the data transfer device retransmits the device information (ID information) without interrupting the host device, the data transfer device can respond without interrupting the host device, reducing overhead in the host device. effective.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, in which 1 represents a common bus. 2-1.2-2.2-3. -12-n is a data transfer device (data transfer adapter). 3-1.3-2.3-3. ---. 3-n is a host device. 4 is a transmitting/receiving section, and 5 is a transmitting/receiving buffer. 6 is a common control section, and 7 is an upper IF section. 8 is the time monitoring department. ■~■ are device information (ID information) exchange sequences. are shown respectively. Zokubutre month's implementation story photo book diagram Z゛ ＜-rs
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Tetsu U-guchi Tei 2 mouths cb) Ihijo's IDi Arukishi Ai Nodero and Shikin and Tomao, Akari Yaguchiko 3 mouths

Claims (1)

[Claims] In a data transfer device (2-n) that transfers data between a plurality of devices (3-n), when exchanging device information (ID information) prior to the data transfer, The device information (ID) is sent from the other device (3-n).
information), interrupts the host device (3-n),
Own device information (I) sent from the host device (3-n)
In order to return the D information) to the partner device (3-n) as response information, a time monitoring section (8) is provided which starts after the transfer of the device information (ID information) is completed, and the time monitoring section (8) If device information (ID information) is received again from the other device (3-n) during the time monitoring, the upper device (3-n)
interrupt to the data transfer device (2-n).
), the data transfer method is characterized in that a self-device information (ID information) response is transferred to the other device (3-n).