JP2002111671A - Communication unit and its switching method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication unit in which the switching time can be minimized and its switching method. SOLUTION: The communication unit 100 has the receiving side 101 and the transmitting side 102. A DATA receiving section A, B 103 receives data at the receiving side 101 of the communication unit 100. FIFO<A>, FIFO<B> 104 stores received data. A DATA selecting section 105 selects data and a switching TIM detecting section 106 detects data based on the stored receiving data. A READ control section 107 controls reading of data. A transmission control section 109 informs cell data transmitted from the transmitting side 102 to the receiving side 101 through a data bus 108 and control communication, based on that cell data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a communication device and a switching method for the communication device.

[0002]

2. Description of the Related Art In recent years, some communication devices can switch asynchronous data without instantaneous interruption. In this type of communication device, when asynchronous data switching occurs, there is a communication device in which reception of the switching timing cell is stopped and switching of the switching timing is performed after all the internal stagnant cells are absent.

[0003]

However, in the conventional communication device, when asynchronous data switching occurs, the reception of the switching timing cell is stopped, and the switching timing is switched after all the internal stagnant cells are absent. In such a case, it is necessary to temporarily stop data reception, or it is necessary to take sufficient time for switching, so that the switching time may be lengthened.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and a communication apparatus and a communication apparatus capable of minimizing a switching time by selectively switching received data without stopping received data. The purpose of the present invention is to provide a switching method for use.

[0005]

As a means for achieving the above object, a communication apparatus according to the present invention is a communication apparatus having a receiving system and a transmitting system, wherein the data is received by the receiving system. Receiving means, data storing means for storing received data, data selecting means for selecting data based on the stored received data, and switching timing detecting means for detecting a switching timing cell based on the stored received data And read control means for performing read control of data, and communication control means for notifying the cell data transmitted from the transmission system to the reception system and performing communication control based on the cell data. It is composed.

With this configuration, when data is received by the receiving system, the received data is stored, data is selected based on the stored received data, and a switching timing cell is selected based on the stored received data. Detect and control the reading of data, when notifying the cell data transmitted from the transmitting system to the receiving system, to perform communication control based on the cell data, without stopping the received data,
By performing selective switching of the received data, the switching time can be minimized.

A communication device according to the present invention includes a data communication means for communicating data, a switching timing cell transmitting means for outputting a switching timing cell, and a selection signal which is output to a receiving system when a switching request is generated on the transmitting / receiving side. And switching means for outputting a transmission instruction to the timing cell transmitting means.

With this configuration, when data communication is performed, a switching timing cell is output, a selection signal is output to the receiving system when a switching request is made on the transmitting / receiving side, a transmission instruction is output, and the receiving data is output. By performing selective switching of the received data without stopping the switching, the switching time can be minimized.

A communication device according to the present invention is a communication device having a receiving system and a transmitting system, wherein the receiving device receives data in the receiving system, the data storing device stores received data, and the stored receiving data. A data selection unit that selects data based on data; a switching timing detection unit that detects a switching timing cell based on accumulated received data; a read control unit that performs data read control; When notifying the transmitted cell data, a control unit for controlling the order of the asynchronous cells based on the cell data to be the same, a data transmitting unit for transmitting the cell data, and a switching timing cell are output. A switching timing cell transmitting means, and outputting a selection signal to the receiving system when a switching request on the transmitting / receiving side occurs, instructing the switching timing cell transmitting means to transmit; A switching means for force, which is constituted so as to include a.

With this configuration, data is received by the receiving system, the received data is stored, data is selected based on the stored received data, and a switching timing cell is detected based on the stored received data. When the cell data transmitted from the transmission system to the reception system is notified and the cell data is transmitted, control is performed so that the order of the asynchronous cells is the same based on the cell data, and the cell data is transmitted. The switching time is output by outputting a switching timing cell, outputting a selection signal to the receiving system when a switching request on the transmitting / receiving side occurs, outputting a transmission instruction, and selectively switching received data without stopping received data. Can be minimized.

[0011] A communication device according to the present invention is a communication device having a reception system and a transmission system. The data reception means receives data in the reception system, the data storage means stores received data, and the stored reception data. A data selection unit that selects data based on data; a switching timing detection unit that detects a switching timing cell based on accumulated received data; a read control unit that performs data read control; When notifying the transmitted cell data, control means for temporarily stopping the reading of the cell data to synchronize the cells, data transmitting means for transmitting the cell data, and outputting the switching timing cell A switching timing cell transmitting means for outputting a selection signal to the receiving system when a switching request on the transmitting / receiving side occurs and instructing the switching timing cell transmitting means to transmit A switching means for outputting, which is constituted so as to include a.

With this configuration, data is received by the receiving system, received data is stored, data is selected based on the stored received data, and a switching timing cell is detected based on the stored received data. When the cell data transmitted from the transmission system to the reception system is notified, the cell data transmission is stopped once, the cell is synchronized, and the cell data transmission is controlled. A switching timing cell is output, a selection signal is output to the receiving system when a transmission / reception-side switching request occurs, a transmission instruction is output, and the reception data is selectively switched without stopping the reception data. Can be minimized.

The communication apparatus according to the present invention is configured so that the switching timing cell is discarded in the data selection means.

With such a configuration, the switching time can be minimized by discarding the switching timing cell in the data selecting means and performing selective switching of the received data without stopping the received data.

A switching method for a communication device according to the present invention includes a step of receiving data in a reception system of a communication device having a reception system and a transmission system, a step of storing received data, and a step of storing the received data. Selecting the data, the step of detecting a switching timing cell based on the stored received data, the step of controlling the reading of data, and notifying the cell data transmitted from the transmission system to the reception system, Controlling based on cell data.

With this configuration, when data is received by the receiving system, the received data is accumulated, the data is selected based on the accumulated received data, and the switching timing cell is selected based on the accumulated received data. To control the reading of data, and when notifying the cell data transmitted from the transmission system to the reception system, control based on the cell data and switch the selection of the reception data without stopping the reception data. By doing so, the switching time can be minimized.

According to the switching method for a communication device of the present invention, there is provided a step of transmitting cell data, a step of outputting the switching timing cell, and a step of outputting a selection signal to the receiving system when a switching request on the transmitting / receiving side occurs. Outputting a transmission instruction at the time of transmitting the switching timing cell.

By doing so, a switching timing cell is output when transmitting cell data, a selection signal is output to the receiving system when a switching request on the transmitting / receiving side occurs, and a transmission instruction is issued when transmitting the switching timing cell. Is output and the received data is selectively switched without stopping the received data, thereby minimizing the switching time.

A switching method for a communication device according to the present invention includes a step of receiving data in a receiving system of a communication device having a receiving system and a transmitting system, a step of storing received data, and a step of storing received data. Selecting the data, the step of detecting a switching timing cell based on the stored received data, the step of controlling the reading of data, and when notifying the cell data transmitted from the transmission system to the reception system, A step of controlling the order of the asynchronous cells based on the cell data, and a step of transmitting the cell data;
The method includes the step of outputting the switching timing cell, and the step of outputting a selection signal to the receiving system and outputting the switching timing cell when a switching request on the transmission / reception side occurs.

By doing so, when data is received by the receiving system of a communication device having a receiving system and a transmitting system,
Storing the received data, selecting the data based on the stored received data, detecting the switching timing cell based on the stored received data, controlling the data reading,
When notifying the transmission system of the cell data transmitted from the reception system, control is performed so that the order of the asynchronous cells is the same based on the cell data, transmit the cell data, and output a switching timing cell, By outputting a selection signal to the receiving system and outputting a switching timing cell when a transmission / reception-side switching request occurs, and by selectively switching received data without stopping received data, the switching time can be minimized.

A switching method for a communication device according to the present invention includes a step of receiving data in a receiving system of a communication device having a receiving system and a transmitting system, a step of storing received data, and a step of storing received data. Selecting the data, the step of detecting a switching timing cell based on the stored received data, the step of controlling the reading of data, and when notifying the cell data transmitted from the transmission system to the reception system, A step of temporarily stopping the reading of the cell data and controlling the transmission so as to synchronize the cells, a step of transmitting the cell data, a step of outputting a switching timing cell, and a step of transmitting / receiving a switching request on the transmitting / receiving side. Outputting a selection signal to the receiving system and outputting a transmission instruction when transmitting the switching timing cell.

In this way, when data is received by the receiving system, the received data is accumulated, data is selected based on the accumulated received data, and the switching timing cell is selected based on the accumulated received data. When the cell data transmitted from the transmission system to the reception system is notified, the cell data is controlled to stop once and the cell is synchronized, And outputs a switching timing cell, outputs a selection signal to the receiving system when a switching request on the transmission / reception side occurs, outputs a transmission instruction when transmitting the switching timing cell, and does not stop the received data. By performing the selection switching, the switching time can be minimized.

A switching method for a communication device according to the present invention includes a step of discarding a switching timing cell when selecting data.

In this way, when data is selected, the switching timing cell is discarded, and the selection of the reception data is performed without stopping the reception data, thereby minimizing the transmission / reception switching time. Can be.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An object of the present invention is to minimize the switching time of received data by selecting and switching received data without stopping the received data.

A communication device according to an embodiment of the present invention will be described. FIG. 1 is a block diagram illustrating a schematic configuration of a communication device according to an embodiment of the present invention.

In FIG. 1, a communication apparatus 100 includes a reception system (reception side) 101 and a transmission system (transmission side) 102. Data reception means (DATA) for receiving data at the reception side 101 of the communication apparatus 100. Receiving units A and B) 103;
Data storage means for storing received data (FIFO <A
>, FIFO <B>) 104 and data selection means (DATA) for selecting data based on the stored received data.
A selector) 105, a switch timing detector (switch TIM detector) 106 for detecting a switch timing cell based on accumulated received data, a read controller (READ controller) 107 for reading data, and Communication control means (transmission control unit) 10 for notifying cell data transmitted from transmission side 102 to reception side 101 via data bus 108 and performing communication control based on the cell data.
9 is provided.

With this configuration, the receiving side 1
When receiving data at 01, the received data is stored, data is selected based on the stored received data, a switching timing cell is detected based on the stored received data, data read control is performed, and 102 to receiving side 1
01, when notifying the transmitted cell data, the communication control is performed based on the cell data, and the reception data switching time is minimized by performing the selection switching of the reception data without stopping the reception data. Will be able to

The communication apparatus 100 includes a data communication unit (data (DATA) transmitting units A and B) 110 for communicating cell data and a switching timing cell communication unit (switching CNT unit) for outputting a switching timing cell. 111,
A switching unit 113 that outputs a selection signal to the receiving side 101 when a switching request is generated between the receiving side 101 and the transmitting side 102 and outputs a transmission instruction to the switching timing cell transmitting unit (switching cell transmitting unit) 112. It is composed.
The switching CNT unit 111 receives a partner switching request and a signal indicating its own state, and outputs a signal indicating its own switching request, a switching C
The output of the NT unit 111 and the data selector (DATA <0
> SEL, DATA <0> SEL) signal.

With this configuration, the transmitting side 1
02, when communication of cell data is performed, a switching timing cell is output, and a selection signal is output from the receiving side 101 when a switching request of the receiving side 101 and the transmitting side 102 occurs,
The transmission instruction is output, and the transmission unit 102 selectively switches the reception data by the switching unit 113 without stopping the reception data, so that the transmission / reception switching time can be minimized.

FIG. 2 is a diagram for explaining the configuration of the main part in FIG. 1. The switching unit 200 can switch from the transmitting side 202, 203 to the receiving side 201, and
2, 203 can be switched to the receiving side 204. Received data is received by the receiving side 201, 204 via the data bus 207. Also, the sending side 20
2, 203, the data selector (DATA <0> S
EL, DATA <0> SEL) signals on the receiving side 201,
04. In FIG. 2, reference numeral 208 indicates a bus.

FIG. 3 is a sequence diagram for explaining the operation in FIG. This will be described with reference to the configuration of FIG.
The switching CNT unit 111 receives a partner switching request or a change in own state.
, The switching CNT unit 111 outputs the data selector signal DATA <0> SE, which is an output to the receiving side 101.
L, DATA <0> SEL is changed. The switching cell transmitting unit 112 is notified of the switching cell transmission request.

The switching cell transmitting section 112 having received the switching cell transmission instruction can transmit a cell indicating the switching timing on the data bus 108. The switching timing cell output on the data bus 108 is
, Through the transmission control unit 109, and the DATA transmission units A,
B110 transmits to the receiving side.

The READ control unit 107 of the receiving side 101 which has detected a change in the data select signals DATA <A> SEL and DATA <B> SEL, which is a data selection signal, instructs the switch TIM detection unit 106 to start the operation of detecting a switch cell. Notify.

Switching TIM detecting section 106 which has received an operation instruction
Then, a switching timing cell is detected from cells from FIFO <A> and FIFO <B> 104 which store data from the data receiving units A and B103.

Switching TIM detecting switching timing cell
The detection unit 106 notifies the READ control unit 107 of the detection result. Upon receiving the detection notification, the READ control unit 107
FIFO <A>, FIFO <B> 10 on the side receiving the notification
4, the reading of one of the FIFOs is stopped.

The switching TIM detection unit 106 that has detected the switching timing cells from both the FIFOs <A> and FIFO <B> 104 issues a selection change instruction to the DATA selection unit 105 and reads it out to the READ control unit 107. Notify start.

In the DATA selection unit 105 that has received the notification,
The direction of DATA selection is changed, and the read control unit 107 starts reading from FIFO <A> and FIFO <B> 104 again. Further, the switching timing cell is DA
Discarded by the TA selection unit 105.

As described above, in the present embodiment, the selection of the received data can be switched without stopping the data reception from the data bus on the transmitting side 102, and the switching time can be minimized. become. Also, the transmitting side 10
Since the second configuration can be used with almost no change to the known configuration, the circuit configuration can be reduced in cost.

In the above-described embodiment, the configuration of the cross connection has been described. However, the present invention is not limited to this, and the present invention can be applied to all devices having a duplex configuration.

[0041]

As described above, according to the present invention,
A communication device and a switching method for the communication device that can minimize the switching time can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a communication device according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a main part in FIG.

FIG. 3 is a sequence diagram illustrating an operation according to the embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 100 communication device 101 receiving side 102 transmitting side 103 DATA receiving section A, B 104 FIFO <A>, FIFO <B> 105 DATA selection section 106 switching TIM detection section 107 READ control section 108 data bus 109 transmission control section 110 data transmission section A, B 113 Switching means 200 Switching section 201, 204 Reception side 202, 203 Transmission side 207, 208 Data bus

Claims (10)

[Claims] 1. A communication device having a receiving system and a transmitting system, comprising: a data receiving unit for receiving data in the receiving system;
Data storing means for storing received data, data selecting means for selecting data based on the stored received data, switching timing detecting means for detecting a switching timing cell based on the stored received data, A communication apparatus comprising: read control means for performing read control; and communication control means for notifying data transmitted from the transmission system to the reception system and performing communication control based on the data. 2. A switching timing cell, comprising: a data communication means for communicating the data; a switching timing cell transmitting means for outputting the switching timing cell; The communication device according to claim 1, further comprising: a switching unit that outputs a transmission instruction to the transmission unit. 3. A communication device comprising a receiving system and a transmitting system, wherein the data receiving means receives data in the receiving system.
Data storing means for storing received data, data selecting means for selecting data based on the stored received data, switching timing detecting means for detecting a switching timing cell based on the stored received data, A read control unit that performs read control, and a control unit that, when notifying cell data transmitted from the transmission system to the reception system, performs control so that the order of asynchronous cells is the same based on the cell data, A data transmitting unit for transmitting the cell data, a switching timing cell transmitting unit for outputting the switching timing cell, and a selection signal being output to the receiving system and transmitting to the switching timing cell transmitting unit when a switching request on the transmitting / receiving side occurs. A communication device comprising: a switching unit that outputs an instruction. 4. A communication device comprising a receiving system and a transmitting system, wherein the data receiving means receives data in the receiving system.
Data storing means for storing received data, data selecting means for selecting data based on the stored received data, switching timing detecting means for detecting a switching timing cell based on the stored received data, Read control means for performing read control, and control means for controlling so as to temporarily stop reading of the cell data and synchronize cells when notifying the cell data transmitted from the transmission system to the reception system. A data transmission unit for transmitting the cell data, a switching timing cell transmitting unit for outputting the switching timing cell, and a selection signal output to the receiving system when a switching request on the transmitting / receiving side occurs, to the switching timing cell transmitting unit. Switching means for outputting a transmission instruction,
A communication device comprising: 5. The communication device according to claim 4, wherein the switching timing cell is discarded in the data selection unit. 6. A method for receiving data in the receiving system of a communication device having a receiving system and a transmitting system, storing the received data, and selecting data based on the stored received data. A step of detecting a switching timing cell based on the accumulated received data, a step of performing data read control, and a notification of cell data transmitted from the transmission system to the reception system, based on the cell data. Controlling the communication device. 7. The step of transmitting the cell data, the step of outputting the switching timing cell, and outputting a selection signal to the receiving system when a switching request on the transmitting / receiving side occurs and instructing transmission when transmitting the switching timing cell. 7. A switching method for a communication device according to claim 6, further comprising the step of: 8. A method for receiving data in the receiving system of a communication apparatus having a receiving system and a transmitting system, storing the received data, and selecting data based on the stored received data. A step of detecting a switching timing cell based on the stored received data; a step of performing data read control; and, when notifying the cell data transmitted from the transmission system to the reception system, based on the cell data. Controlling the order of the asynchronous cells to be the same, transmitting the cell data, outputting the switching timing cell, and selecting the receiving system when a transmission / reception side switching request occurs. Outputting a signal and outputting a switching timing cell. 9. A method for receiving data in the receiving system of a communication device having a receiving system and a transmitting system, storing the received data, and selecting data based on the stored received data. Detecting a switching timing cell based on the stored received data; controlling data read; and notifying the cell data transmitted from the transmission system to the reception system, when reading the cell data. Temporarily stopping and controlling transmission so as to synchronize cells; transmitting the cell data; outputting the switching timing cell; and Outputting a selection signal and outputting a transmission instruction at the time of transmission of the switching timing cell. 10. The switching method for a communication device according to claim 9, further comprising a step of discarding a switching timing cell when selecting said data.