JPH05173922A - Data transfer control system - Google Patents

Abstract

PURPOSE:To automatically recover a fixed fault of a related serial interface with degeneracy with respect to data transmission/reception between a channel device and a peripheral controller using a pair of plural serial interfaces. CONSTITUTION:In the data transfer system where a channel device 1 and a corresponding peripheral controller use a pair of serial interfaces 31 to 3N and 41 to 4N to transmit and receive control information and data, the channel device 1 and the peripheral controller 2 are provided with means 29 and 30, which monitor the validity of data sent from the transmissionside device in bit serial at the time of data reception, and means which inform their own device and the transmission-side device that data is not valid at the time of detecting lack of the validity of data by means 29 and 30, and the transmission- side device is informed of this detection to disconnector one serial interface where the fault occurs, and N-1 degenerated serial interface are used to transmit and receive data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer control system, and more particularly to a data transfer control system using a plurality of pairs of serial interfaces such as optical cables.

[0002]

2. Description of the Related Art A data transfer control method using a pair of serial interfaces composed of conventional optical cables, or
In a data transfer control method using a plurality of pairs of serial interfaces in order to realize higher speed data transfer, the correctness of control information and data transferred via the serial interface depends on a parity bit or ECC (Error Correct).
ing Code) or CRC (Cyclic Redundancy check)
If it is verified that the data is not valid, the OS is checked.
A soft retry by (Operating System) or a retry by the input / output control device or the peripheral control device is being performed.

[0003]

The retry method in the conventional data transfer control is effective when the failure is an intermittent failure, but of course, when the failure is a fixed failure or a failure close thereto, the failure automatically occurs. It cannot be restored.

[0004]

It is an object of the present invention to improve the disadvantages of the conventional example, and in particular, in transmitting and receiving data between a channel device and a peripheral controller using a plurality of pairs of serial interfaces, a fixed failure of the serial interface is caused. It is an object of the present invention to provide a data transfer control system capable of automatically recovering from a failure while degenerating it.

[0005]

According to the present invention, in a data transfer system in which a channel device and a peripheral control device corresponding to the channel device transmit and receive control information and data using a pair of serial interface N pairs, the channel device and In each of the peripheral control devices, at the time of receiving the data, a means for monitoring the validity of the data sent from the transmitting side device in a bit serial correspondence, and a case where the means detects the lack of the validity of the data And a means for notifying this to the own device and the transmitting side device, and when the transmitting side device receives the above notification, it disconnects the one serial interface in which the fault has occurred and degenerates (N- 1) A means for transmitting and receiving data using the serial interface of the book is provided. This aims to achieve the above-mentioned object.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the embodiment shown in FIGS. 1 to 4, the channel device 1 and the peripheral control device 2 are connected by N pairs of serial interfaces 3 _{1 to} 3 _N and 4 ₁ to 4 _N. For data transmission / reception on the interface, data is serially transmitted / received in frame units including a frame header section, a data section, a check code section, etc., and has N pairs of serial interfaces to realize high-speed data transfer. . Each of the channel device 1 or the peripheral control device 2 has
Frame creation units 10 ₁ to 10 _N and 23 ₁ to 23 _N for frame formation corresponding to the serial interface, CRC creation unit 1
1 _{1 to} 11 _N or 24 _{1 to} 24 _N , frame analysis units 12 _{1 to} 12 _N or 21 _{1 to} 21 _N for frame data pattern analysis, and CRC check units 13 _{1 to} 13 _N or 22 _{1 to} 22 _N. When the CRC check unit detects that the received data is not valid, it reports the detection of illegal data to the transmitting side device using its own device and the corresponding transmitting side serial interface, and Isolate the failed serial interface,
Subsequent data transfers including retries are performed using the (N-1) serial interfaces. Further, the data alignment control units 9 and 20 are provided to align the data including the upper interface 5 and the lower interface 6 by the degenerate data transfer of (N-1) lines.

2 and 3 are explanatory views showing the alignment of the above-mentioned data. Here, FIG. 2 is a diagram for explaining a flow of transfer data at the time of input data transfer in data transfer using four pairs of serial interfaces, and FIG. 3 shows a failure in one input direction serial interface in the data transfer shown in FIG. FIG. 6 is a diagram showing a flow of transfer data in the case of being separated. In this embodiment, a data path having a width of 4 bytes is provided as a higher-level interface. As shown in FIG. 3, during the degenerate operation of the serial interface, the transmission side device (peripheral control device in this example) and the reception side device (main) With the channel device (in the example), the data is aligned as shown by the instructions of the data alignment control units 9 and 20. Further, the failure history monitoring units 29 and 30 for counting the number of times of the failure occurrence in the specified time in a bit serial correspondence are provided, and if the failure occurrence frequency is equal to or lower than a predetermined threshold value, normal retry is performed and the threshold value is exceeded. In this case, by disconnecting one serial interface in which a failure has occurred and performing degenerate data transfer using (N-1) lines, a more flexible failure processing method can be provided.

[0008]

As described above, according to the present invention, when data is transmitted and received between a channel device and a peripheral control device using a plurality of pairs (N pairs) of a pair of serial interfaces, one fixed failure of the serial interface. Alternatively, when a failure similar to that occurs, one of the serial interface signals is disconnected, and data transfer using (N-1) serial interfaces becomes possible, and therefore retry can be made possible, and reliability against fault tolerance can be achieved. It is possible to provide a high data transfer control system.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing a flow of transfer data at the time of input data transfer in the data transfer using the four pairs of serial interfaces in FIG.

FIG. 3 is an explanatory diagram showing a flow of transfer data when one of the input-direction serial interfaces fails and is disconnected in the data transfer shown in FIG.

[Explanation of symbols]

1 channel device 2 peripheral control device 31 to 3N N output direction serial interface 41 to 4N N input direction serial interface 5 upper interface 6 lower interface 7 channel control unit 8, 19 data buffer 9, 20 data alignment control unit 10 ₁ to 10 _N , 23 ₁ to 23 _N frame creation unit 11 _{1 to} 11 _N , 24 _{1 to} 24 _N CRC creation unit 12 _{1 to} 12 _N , 21 _{1 to} 21 _N frame analysis unit 13 _{1 to} 13 _N , 22 ₁ to 22 _N CRC check unit 14 _{1 to} 14 _N , 27 _{1 to} 27 _N parallel / serial conversion unit 16 _{1 to} 16 _N , 25 _{1 to} 25 _N serial / parallel conversion unit 15 ₁ to 15 _N , 28 _{1 to} 28 _N electric Optical conversion unit 17 _{1 to} 17 _N , 26 _{1 to} 26 _N Optical / electrical conversion unit 29, 30 Fault history monitoring unit

Claims (2)

[Claims] 1. A data transfer system in which a channel device and a peripheral control device corresponding thereto transmit and receive control information and data using a pair of serial interfaces N pairs. Means for monitoring the legitimacy of the data sent from the transmitting side device at the time of reception of the data, and when the means detects the lack of the legitimacy of the data, this means Means for notifying the device, disconnecting the one serial interface in which the failure has occurred when the transmitting device receives the notification, and using the degenerated (N-1) serial interface A data transfer control system comprising means for transmitting and receiving data. 2. A data transfer system in which a channel device and a peripheral control device corresponding to the channel device transmit and receive control information and data using a pair of serial interfaces N pairs. Means for monitoring the legitimacy of the data sent from the transmitting side device at the time of reception of the data, and when the means detects the lack of the legitimacy of the data, this means Means for notifying the device, disconnecting the one serial interface in which the failure has occurred when the transmitting device receives the notification, and using the degenerated (N-1) serial interface Equipped with means for transmitting / receiving data and failure history monitoring means for counting the number of times of occurrence of the failure within a specified time in a bit-serial correspondence, A data transfer control system comprising means for performing normal retry if the occurrence frequency is less than or equal to a predetermined threshold value, and means for performing the above-mentioned degenerate data transfer when the occurrence frequency exceeds the threshold value.