JPH0642679B2 - Continuous bypass controller - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to communication control, and more particularly to a continuous bypass control device for performing bypass control of a ring bus.

[Conventional technology]

Conventionally, there have been two types of bypass control devices of this type. That is, whether the data is physically switched from the main route to the bypass route and the continuity of data is not guaranteed, or whether the switching is continuously performed with a delay equivalent to that of the main route to guarantee continuity. Either method was adopted.

[Problems to be solved by the invention]

Among the above-mentioned conventional bypass control devices, a device that physically switches, causes data discontinuity, and requires systematic measures. Also, in the latter device that guarantees the continuity of the data, the delay is required for the bypass as much as the delay of the main route, and the system with a large number of connections has a large delay even when the bypass is performed, which lowers the system throughput. There was a flaw.

Therefore, an object of the present invention is to finally set the delay at the time of bypass to 1
It is an object of the present invention to provide a continuous bypass control device that can be integrated into flag patterns and can also improve throughput in the system.

[Means for solving problems]

In the present invention, (i) a main route used when accessing a ring-type bus and controlling transmission / reception of data;
(Ii) a switching transmission unit connected to the output side of the main route, and (iii) a first transmission line connected to the switching transmission unit, the output side of which has a delay corresponding to a delay time that occurs when a signal passes through the main route. The bypass route of (4) and (iv) the delay circuit with the flag pattern detection function are connected in series by the number corresponding to the delay time described above, and the output side of each of these delay circuits is connected to the switching transmission section. 2 bypass routes, and (v) a delay circuit relating to the detection of the final flag pattern when the detection of the flag pattern is performed in a form in which a plurality of the delay circuits described above are connected toward the input side of the second bypass route. And a flag pattern continuous monitoring unit for instructing the switching transmission unit to perform switching based on the data supplied from the output terminal of the.

The flag pattern continuous monitoring unit performs the switching control of the switching detection unit so that data is transmitted from the first bit of the final flag pattern each time the delay circuit detects a continuous flag pattern. Can be aggregated into one flag pattern delay.

Therefore, even in a system having a large number of main route connections, it is possible to suppress the delay when using the bypass route and improve the system throughput.

〔Example〕

 The present invention will be described in detail below with reference to examples.

FIG. 1 shows an embodiment of a continuous bypass control device according to the present invention. In the figure, a main route 1 is a normal route used when a corresponding device accesses a ring-type bus and controls transmission / reception of data. The first bypass route 2 is a route for disconnecting the relevant device from the ring bus, and is a bypass route having the same configuration as the main route 1 in order to ensure continuity of data and switch. The second bypass route 3 is formed by connecting delay circuits 4 with a flag pattern detecting function in series by the amount corresponding to the delay of the main route, that is, by N pieces.

Here, delay circuits with flag pattern detection functions 4 ₁ to 4
_N has a function of performing a delay operation of data, simultaneously comparing flag patterns, and notifying the flag pattern continuous monitoring unit 5 of that when a match with a flag pattern is detected. Flag pattern continuous monitoring unit 5
Is a delay circuit 4 which supplies an output to the switching transmission section 5, respectively.
_When 2 or more flag patterns including ₁ to 4 _N are continuously detected toward the input end side, the output of the delay circuit 4 with the flag pattern detection function relating to the final flag pattern detection This is a monitoring control unit that monitors and gives an instruction to send an output from the end to the switching sending unit 6. Further, the switching transmission unit 6 performs switching so as to sequentially input the outputs of the delay circuit 4 with the flag pattern detection function relating to the final flag pattern detection described above in response to an instruction from the flag pattern continuous monitoring unit 5. .

For example, when the flag pattern continuity monitoring unit 5 detects the continuity of the flag patterns by the notification of the _three delay circuits 4 ₁ to 4 ₃ , it issues an instruction to the switching transmission unit 6 to delay the final flag pattern detection. 4 and performs switching so as to input the output supplied from the _third output terminal to the switching delivery unit 6.

The operation will be described below with reference to FIGS.

FIG. 2 shows the operation when the normal main route 1 is selected. The reception data 10 including the data D and the flag F enters the main route 1 and is directly transmitted as the transmission data 11 via the switching notifying unit 6 without being processed.

FIG. 3 shows the operation when the first bypass route 2 is selected in the bypass state. The reception data 10 is delayed without being processed and is transmitted.

Next, the operation when the second bypass route using the delay circuit with the flag pattern detection function is selected in the bypass state will be described with reference to FIG.

In this case, the received data 10 is input to the delay circuit 4 _N ,
It is sequentially shifted and supplied to the switching換送out section 6 from the delay circuit 3 _1. The data input to the transmission unit 6 is the transmission data 11
Is output as.

However, in the second bypass route 3, a flag pattern is detected in the received data 10, and the delay circuits 4 ₁ and 4 ₂ continue from the output end side of the second bypass route 3 toward the input end side. the flag pattern continuous monitoring unit 4,5 of the detection of the flag pattern is learned by the notification from the delay circuit 4 _1, 4 _2, the flag pattern continuous monitoring unit 5 issues an instruction (notification) to the switching換送out section 6 final of performing switching so as to input the output from the flag pattern according to the detection delay circuit 4 _{and second} output terminals. Thus, the received data from the first bit in the order of the final flag pattern from the delay circuit 4 ₂ As shown in Fig. 4, is sent to the switching delivery unit 5.

In this case, the second bypass route 3 delay circuit ₄ 2-4
It consists _N, amount corresponding second bypass route of the delay circuit 4 ₁ is shortened. Then, one flag pattern is deleted from the transmitted data as shown in the figure.

FIG. 5 shows a state in which the route is finally switched to the last route after several processes using the second bypass route in the bypass state. For example, in a simple example, while the processing in the state of FIG.
It is assumed that the flag patterns in the received data 10 are continuously detected up to ₂ to 4 _N (here, N = 4 in consideration of the received data example of FIG. 5). In this case, the flag pattern continuous monitoring section 5 issues an instruction to the switching transmission section 6 to perform switching so as to input the output from the output terminal of the delay circuit 4 _N , which causes the state shown in FIG. Become. Thus the first in the received data sequence shown in the figure, the second data D, D is output to the switching sending unit 6 from the delay circuit 4 _2, then the data F of No. 5 is switched sent from the delay circuit 4 _N The sixth data D, which is output to the unit 6, also receives the delay circuit 4 _N
Is output to the switching output unit 6. As a result, a data string as shown in FIG. 5 is obtained as the transmission data 11 from the switching transmission unit 6.

In the state of FIG. 5, the delay due to the second bypass route 3 has been shortened to one flag pattern due to the delay circuit 4 _N.

In any case, it is possible to finally concentrate on such a delay of one flag pattern. Therefore, even a system with a large number of main route connections can be a system with a small bypass delay, and the system throughput can be improved.

〔The invention's effect〕

As described above, according to the present invention, in the bypass state by the second bypass route, data transmission processing is performed from the delay circuit with the flag pattern detection function on the output end side of the second bypass route to the switching transmission unit, Each time a continuous flag pattern is detected, the delay circuit with the flag pattern detection function, which performs data transmission processing to the switching transmission unit, switches to the delay circuit with the flag pattern detection function related to the final flag pattern detection. Eventually, the data transmission process is performed from the delay circuit with the flag pattern detection function on the input end side of the second bypass route to the switching transmission unit, which can be summarized as a delay of one flag pattern.

Therefore, according to the present invention, even a system with a large number of main route connections can be a system with a small delay in bypassing, and the system throughput can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIGS.
FIG. 5 is a diagram for explaining the operation of FIG. 1 ... Main route, 2 ... First bypass route, 3 ... Second bypass route, 4 ₁ to 4 _N ... Delay circuit with flag pattern detection function, 5 ... Flag pattern continuous monitoring unit, 6 ... ... Switching and sending unit.

Claims (1)

[Claims] 1. A main route used when accessing a ring-shaped bus to control transmission / reception of data, a switching transmission unit connected to an output side of the main route, and a signal passing through the main route. A first bypass route having a delay corresponding to the delay time that occurs at the output side connected to the switching transmission section, and a delay circuit having a flag pattern detection function are connected in series by the number corresponding to the delay time. And a second bypass route connecting the output side of each of these delay circuits to the switching transmission section, and a flag pattern in a form in which a plurality of the delay circuits are continuous toward the input side of the second bypass route. When the detection is performed, a flag pattern for instructing the switching transmission section to perform switching based on the data supplied from the output terminal of the delay circuit related to the detection of the final flag pattern. And a continuous pattern monitoring section, and the flag pattern continuous monitoring section performs switching control of the switching transmission section so that data is transmitted from the first bit of the final flag pattern each time the delay circuit detects a continuous flag pattern. The continuous bypass control device is characterized by performing the above, and sequentially performing the above, and finally consolidating into a delay of one flag pattern.