JPH0214350A - Data transferring system - Google Patents

Abstract

PURPOSE:To attain high speed data transferring without inviting the complication of constitution, which is needed for the data transferring, by showing the request of the data transferring and a response to this request to an opponent side with the inversion of a requesting signal and a responding signal. CONSTITUTION:A transferring request means 20 of a first device 10 requests the data transferring by inverting the requesting signal and giving the signal through a first signal line 14 to a second device 12. A request confirming means 24 of the second device 12 confirms the request of the data transferring from the first device 10 with the inversion of the requesting signal and a responding means 26 shows the response to the request of the data transferring by inverting the responding signal and giving the signal through a second signal line 16 to the first device 10. A response conforming means 22 of the first device 10 confirms the response of the second device 12 by the inversion of the responding signal. Then, between the first device 10 and second device 12, the data transferring is executed through a data bus 18.

Description

[Detailed Description of the Invention] [Table of Contents] Overview Industrial Application Fields Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems Effects of the Invention [Summary] Data transfer between devices is a data bus With regard to data transfer methods performed via A request signal for data transfer is given to the second device via the first signal line, and a response signal to the request signal is given from the second device to the first device via the second signal line. In a data transfer method in which data is transferred to and from a second device via a data bus, the first device inverts the request signal to transfer data to the second device.
means for requesting a data transfer from a device; and means for confirming a second device response to the request by an inversion of the response signal; and means for responding to the request by inverting the response signal.
It consists of:

[Industrial Application Field] The present invention relates to a data transfer method in which data transfer between devices is performed via a data bus.

For example, data is transferred between devices in a computer system via a data bus, and in this case, signal lines such as tag lines attached to the bus are used.

[Prior Art] In FIG. 5A, tag lines 14, 16 are provided between the I10 device 10 and the channel device 12 along with the data bus 18, and these are connected to the 110 device 10. It is used for data transfer between channel devices 12 via bus 18.

FIG. 6(A) shows the transfer data sent to the data bus 18, and FIG. 6(B) shows the data transfer request signal applied from the I10 device 10b) to the channel device 12 via the tag line 14. Figure (C) shows channel devices 12 to I10.
The response signals provided to device 10 via tag line 16 are each shown.

When data transfer is requested from the I10 device EIO to the channel device 12 by the rise of the request signal as shown in FIG. Data sent to and from I10 device 10 onto data bus 18 is captured by channel device 12 .

This data transmission or acquisition by the channel device 12 is also indicated by the rise of the response signal, and when the response signal rises as shown in FIG. It is confirmed.

However, since it is necessary to raise and lower the tag signal (request signal and response signal) every time data is transferred,
The data transfer speed is reduced by the skew due to the fall of the tag signal.

Therefore, as shown in FIG. 5(B), four tag lines 14-1.
14-2.16-1.16-2 is provided, and the tag line 14
-1.14-2 is for data transfer request, tag line 1B-1,
16-2 are each used for a response to the request.

6121 (D) shows the data transferred by the data bus 18, (E) shows the request signal sent to the tag line 14-1, and (F) shows the tag signal as a response to the request. The response signal sent to line 16-1 is shown in (G) in the same figure.
The request signal sent to the tag line 14-2 is shown in the figure (H
) respectively show response signals sent to the tag line 16-2 in response to the request.

These Figures 6 (D), (E), (F), (G).

As understood from (H), tag line 14-1゜14-
2 and tag lines 16-1 and 16-2 are used as wires, respectively, and a request or a response thereto is confirmed by the rise of these signals.

As a result, the tag signal changes once for each data transfer.

Therefore, in this case, approximately 2
This makes it possible to transfer data at faster speeds.

[Invention tries to solve! ! H] However, in the case of Figure 5 (B), the number of tag lines is twice as much as in the case of Figure 5 (A), so the number of tag lines is required for data transfer in both devices. Components become more complex.

The present invention has been made in view of the above-mentioned conventional problems,
The purpose is to provide a data transfer method that enables high-speed data transfer without complicating the configuration required for data transfer.

[Means for Solving the Problems] In order to achieve the above object, the present invention employs the method shown in FIG. 1.

In the figure, a request signal for data transfer is given from the first device 10 to the second device 12 via the first signal line 14, and a response signal to the request is sent from the second device 12 to the first device 10 via the second signal line. 16.

As a result, data is transferred between the first device 10 and the second device 12, and the transfer is performed via the data bus 18.

The means 20 of the first device to inverts the request signal to request data transfer to the second H device 12, and the response of the second device 12 to the request is confirmed by the means 22 by inverting the response signal. be done.

Further, the request confirmation means 24 of the second device 12 confirms the data transfer request by inverting the request signal applied from the means 20 via the first signal line 14, and the means 26 confirms the response to the request by the response signal. Shown in reverse relative to the first device.

[Operation] In the present invention, the request for data transfer and the response thereto are indicated to the other party by inverting the request signal and the response signal, so in the example of FIG. and falling are both used.

[Embodiments] Hereinafter, preferred embodiments of the system according to the present invention will be described based on the drawings.

In FIG. 2, the configuration of the embodiment is explained, and data transfer is performed between the 10 device 10 and the channel device 12 via the data bus 18. In FIG.

Unlike the case in FIG. 5(B), only the tag wire 14°16 is used for the data transfer, as in the case in FIG. 5(A). A data transfer request signal is sent, and a response signal to the request is sent from the channel device 12 to the tag line 1G.

The I10 device 10 and the channel device 12 are each provided with data transfer circuits 28 and 30 that transfer data between them via the data bus 18, and these are each controlled by transfer control circuits 32 and 34. has been done.

In this example, the data transfer circuit 2 and the data transfer circuit 30 have the same configuration, and the transfer control circuit 32 and the transfer control circuit 3 have the same configuration.
4 also has the same configuration.

In FIG. 2, the configuration of the transfer control circuit 34 is shown, and from the transfer control circuit 32 of the I10 device tlo to the tag &1
The data transfer request signal sent to the channel device 14 is sent to the rise detection circuit 36 provided in the transfer control circuit 34 of the channel device 12.
and the falling edge detection circuit 3 through the tag line 14.

The rise detection circuit 36 and the fall detection circuit 38 detect the rise and fall of the request signal, respectively, and these detection signals are provided to the bus control circuit 42 via the OR circuit 40.

The data transfer circuit 28 is controlled by the bus control circuit 42, and as a result, data is sent to the bus 18 from the channel device 12 side to the I10 device 10, or data sent from the I10 device 10 to the data bus 18. is taken into the channel device 12.

The detection signals of the rise detection circuit 36 and fall detection circuit 38 are also applied to the tag-out control circuit 44 as well as the bus control circuit 42, and the tag-out circuit 46 is controlled by the tag-out control circuit 44.

As a result, the response signal applied from the tag-out circuit 46 to the transfer control circuit 32 of the I10 device 10 via the tag line 16 is raised or lowered by the tag-out circuit 46. As a result, the transfer control circuit 32 of the I10 device 10 confirms the response to the data transfer request.

The operation of this embodiment is explained in FIG. 3, and the same figure (A
), the data sent to the data bus 18 is shown in the figure (
B) shows a data transfer request signal given from the I10 device IO to the channel device 12 via the tag line 14, and (C) shows a response given from the channel device 12 to the I10 device 10 via the tag line 16. Each signal is shown.

As can be understood from FIG. 3, in this embodiment, data is transferred at both the rising and falling edges of the request signal! 1
0 device 10 to channel device 12, and a response to the transfer request is given from channel device 12 to I10 device 0 on both the rising and falling edges of the response signal.

Therefore, according to this embodiment, by using only one set of tag lines 14 and 16 as in the case of FIG. 5(A), as in the case of FIG.
As in the case of , high-speed data transfer can be performed.

Note that if the use of another tag line is allowed, it is possible to use this to further enhance the functionality.

An example of such a case is shown in FIG. 4, and in this example, a signal line (S t op ) for forcibly terminating the data transfer by the tag lines 14 and 16 is prepared.

A new tag line (S t op) signal is raised to this signal line prior to the inversion of the request signal or response signal, and data transfer by the tag lines 14 and 16 is forcibly terminated.

If the subsequent inversion of the request signal and response signal is set as invalid for data transfer, data unit transfer requests and responses thereto are prohibited.

Therefore, it is possible to perform continuous data transfer, and therefore it is possible to easily shift to a mode in which even-numbered data or odd-numbered data can be continuously transferred.

[Effects of the Invention] As explained above, according to the present invention, a data transfer request and a response thereto are indicated by both the rising and falling edges of the data transfer request signal and the response signal, so that the data transfer is A high-performance system capable of high-speed data transfer can be realized without complicating the device configuration required for this purpose.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the principle of the invention, Fig. 2 is an explanatory diagram of the configuration of the embodiment, Fig. 3 is an explanatory diagram of the operation of the embodiment, and Fig. 4 is an explanatory diagram of the operation when a tag line is added to the embodiment. , FIG. 5 is an explanatory diagram of the conventional example, and FIG. 6 is an explanatory diagram of the operation of the conventional example. 10... I10 device l 2 ・ 14° 18 ・ 28° 36 ・ 38 ・ 40 ・ 44 contest... Channel device 16... Tag line... Data bus 30... Data transfer circuit... Startup detection circuit・Fall detection circuit ・OR circuit ・Bus control circuit ・Tagout control circuit

Claims (1)

[Claims] A data transfer request signal is given from the first device (10) to the second device (12) via the first signal line (14),
By giving a response signal to the request signal from the device (12) to the first device (10) via the second signal line (16), the connection between the first device (10) and the second device (12) In a data transfer method in which data transfer is performed via a data bus (18), the first device (10) includes means (2) for requesting data transfer from the second device (12) by inverting the request signal.
0), and means (22) for confirming a second device (12) response to the request by inverting the response signal, the second device (12) receiving a data transfer request from the first device (10). A data transfer system comprising: means (24) for confirming the request by inverting the request signal; and means (26) for responding to the request by inverting the response signal.