JPH06291803A - Data transmitter-receiver - Google Patents

Abstract

PURPOSE:To unify a scan memory to be used in a scan transmission system to facilitate operations such as the addition and elimination of scan blocks and to access the scan memory without using mediation on the side of a transmission/reception controller even when a memory capacity directly accessible by the transmission/reception controller is smaller than the memory capacity used in the system. CONSTITUTION:When scan data are transmitted from another data transmitter- receiver, the scan data are received by a reception circuit 3 exclusive for the scan data and stored in the scan memory 4. Then, at the time of transmitting the scan data to the other data transmitter-receiver, the scan data to be a transmission object stored in the scan memory 4 are read in a FIFO form by a transmission/reception circuit 1 and are transmitted to the other data transmitter-receiver.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission / reception apparatus using a scan transmission system which is one of broadcast communication systems.

[0002]

2. Description of the Related Art In a data transmission / reception apparatus for transmitting / receiving data, the memory capacity that can be occupied by a transmission / reception controller that controls transmission / reception operations cannot exceed the capacity determined by the number of address lines of the transmission / reception controller.

Therefore, in a system in which a larger number of transmission / reception blocks are required due to the limited memory capacity, the transmission memory and the reception memory are divided, and when transmitting data, When storing the transmission data in the memory of, reading it by the transmission and reception controller and sending it out on the transmission line, and when receiving the data,
Data on the transmission path is taken in by a reception-dedicated circuit provided independently of the transmission / reception controller and stored in a reception memory.

As a result, even if the memory capacity that can be directly accessed by the transmission / reception controller is small, the memory capacity of the entire system can be increased and many transmission / reception blocks can be processed.

Further, in a data transmission / reception apparatus adopting a scan transmission method, which is one of the broadcast communication methods, it is apparent that all stations can access one memory by a basic operation of the scan transmission method. In order to fill, the transmit / receive memory must be one.

Therefore, when an operation such as adding or deleting a scan block is performed, a logic for performing a complicated process such as moving the data in the receiving memory to the transmitting memory is required.

FIG. 2 is a block diagram showing an example of a data transmission / reception apparatus of a scan transmission system having such a logic.

The data transmission / reception apparatus shown in this figure comprises a transmission / reception circuit 101, a scan data dedicated reception circuit 102, and another device 103. When scan data is transmitted from another station, the scan data dedicated reception is carried out. When the circuit 102 receives the data and stores the received data, and when the scan data or the data other than the scan data is transmitted to another station or the data other than the scan data is received, the transmission / reception circuit 101 is used. Data is transmitted / received to transmit the data to be transmitted, or data is received and stored.

The transmission / reception circuit 101 is connected to a transmission path 104 for transmitting data to another station and a transmission path 105 for receiving data from another station, and a transmission / reception controller 106 for transmitting / receiving data, and a transmission / reception controller 106 of this transmission / reception controller 106. An arbitration circuit 107 that arbitrates the operation with the other device 103 or the scan data dedicated receiving circuit 102, and the transmission data (scan data or scan data output from the scan data dedicated receiving circuit 102 or the other device 103. (Data other than the above) is stored and stored, and when a read command is supplied from the transmission / reception controller 106, the stored data is read out and supplied to the transmission / reception controller 106 via the arbitration circuit 107. And 108.

When transmitting scan data or data other than the scan data, the arbitration circuit 107 adjusts the operation with the scan data dedicated reception circuit 102 or another device 103 while the scan data dedicated reception circuit 102 or After temporarily storing transmission data (scan data or data other than scan data) output from another device 103 in the transmission memory 108, the data stored in the transmission memory 108 is changed by the transmission / reception controller 106. Read out and transmit this
Send it up and send it to another station. When data other than scan data is transmitted from another station via the transmission path 105, the transmission / reception controller 1 adjusts the operation with the scan data dedicated reception circuit 102 and the other device 103 by the arbitration circuit 107.
The data is fetched by 06 and stored in the transmission memory 108.

The scan data dedicated receiving circuit 102 is also provided.
Is a scan data reception control circuit 109 that is connected to the transmission line 105 and performs scan data reception processing, and an arbitration circuit that arbitrates the operation of the scan data reception control circuit 109 and the operation of the other device 103 and the transmission / reception circuit 101. 110 and the arbitration circuit 1 when scan data is received by the scan data reception control circuit 109.
A receiving memory 111 is provided for temporarily storing the data by taking in the data via 10.

When the scan data is transmitted from another station and is supplied through the transmission path 105, the arbitration circuit 110 adjusts the operation with the other device 103 and the transmission / reception circuit 101 while controlling the scan data reception. This scan data is fetched by the circuit 109 and stored in the receiving memory 111.

The other device 103 is a device for performing various control operations and data display. When using scan data from another station, the scan data is read from the reception memory 111 and is used. When carrying out processing by using it and transmitting scan data to another station, the transmission memory 108 is used.
Write scan data to and send it to another station.

Next, the operation of the data transmitting / receiving apparatus will be described with reference to the block diagram shown in FIG.

<< When transmitting data other than scan data >> When transmitting data other than scan data, first, data to be transmitted to the transmission memory 108,
That is, after the data other than the scan data output from the scan data dedicated receiving circuit 102 or the other device 103 is written, a transmission request is issued to the transmission / reception controller 106.

As a result, the transmission / reception controller 106
While operating the arbitration circuit 107 to adjust the operation with the scan data dedicated receiving circuit 102 and the other device 103,
The data written in the transmission memory 108 is read out, sent out on the transmission path 104, and transmitted to another station.

<< When Receiving Data Other Than Scan Data >> If data other than scan data is transmitted from another station and supplied via the transmission path 105, the transmission / reception controller 106 receives the data. The received data is written in the transmission memory 108 while operating the arbitration circuit 107 to adjust the operations of the scan data dedicated reception circuit 102 and the other device 103.

<< When transmitting scan data >>
When transmitting the scan data, first, the scan data to be transmitted, that is, the scan data output from the scan data dedicated receiving circuit 102 or the other device 103 is written in the transmission memory 108, and then is transmitted to the transmission / reception controller 106. A request for transmission is issued.

As a result, the transmission / reception controller 106
While operating the arbitration circuit 107 to adjust the operation with the scan data dedicated receiving circuit 102 and the other device 103,
The scan data written in the transmission memory 108 is read out, sent out on the transmission path 104, and transmitted to another station.

<< When Scan Data is Received >>
If scan data is transmitted from another station and is supplied via the transmission path 105, the scan data reception control circuit 109 detects this and the arbitration circuit 110 operates with the other device 103 and the transmission / reception circuit 101. The scan data is received and stored in the receiving memory 111 while adjusting the.

As described above, in this data transmitting / receiving device,
The transmission memory 108 occupied by the transmission / reception controller 106 is used as a storage area for scan data to be transmitted and data other than this scan data and a storage area for data other than the received scan data.
By using the reception memory 111 that is not occupied by the transmission / reception controller 106 as a storage area for received scan data, it is possible to handle scan blocks having a memory capacity larger than that of the transmission / reception controller 106.

[0022]

However, the above-mentioned conventional data transmitter / receiver has the following problems.

That is, in order to make the memory capacity used in the system larger than the memory capacity that can be directly accessed by the transmission / reception controller 106,
A transmission / reception memory is a transmission memory 108 and a reception memory 1
11, the transmission memory 108 and the reception memory 111 are individually managed, so that the switching process and the arbitration process of the transmission / reception operation become complicated, which complicates the circuit configuration. There was a problem that it would end up.

Further, the transmission / reception memory is the transmission memory 108.
And the receiving memory 111, the receiving memory 111 is used when the number of scan blocks needs to be increased or decreased in order to expand or reduce functions in the system.
Then, there is a problem that the circuit for the transmission memory 108 needs to be changed according to the number of scan blocks, and this cannot be easily performed.

In view of the above circumstances, the present invention unifies the scan memory used in the scan transmission method even when the memory capacity that can be directly accessed by the transmission / reception controller is smaller than the memory capacity used in the system, An object of the present invention is to provide a data transmission / reception device that can facilitate operations such as addition and deletion of scan blocks, and can access a scan memory without using arbitration on the transmission / reception controller side.

[0026]

In order to achieve the above object, a data transmitting / receiving apparatus according to the present invention includes a scan data dedicated receiving circuit for receiving scan data when another data transmitting / receiving apparatus transmits the scan data. A scan memory that stores the scan data received by the scan data dedicated receiving circuit and the scan data to be transmitted, and the scan memory that is stored in the scan memory when transmitting the scan data to another data transmitting / receiving device. A transmission / reception circuit for reading the scan data to be transmitted in a FIFO format and transmitting the read scan data to another data transmission / reception device.

[0027]

In the above structure, when the scan data is transmitted from another data transmitting / receiving device, the scan data dedicated receiving circuit receives the scan data and stores it in the scan memory, and the scan data is transmitted to the other data transmitting / receiving device. When transmitting, scan data to be transmitted, which is stored in the scan memory and is to be transmitted, is read in a FIFO format and transmitted to another data transmitting / receiving device when transmitting.

[0028]

1 is a block diagram showing an embodiment of a data transmitting / receiving apparatus according to the present invention.

The data transmission / reception apparatus shown in this figure comprises a transmission / reception circuit 1, an exclusive memory 2, a scan data dedicated reception circuit 3, a scan memory 4 and another device 5, and scan data from another station is received. Is transmitted by the scan data dedicated receiving circuit 3, the scan data obtained by this receiving operation is stored in the scan memory 4, and the scan data is transmitted / received when transmitting the scan data to another station. When the circuit 1 reads the scan data to be transmitted, which is stored in the scan memory 4 and transmits the scan data to another station, and when data other than the scan data is transmitted / received, the transmission / reception circuit 1 receives the data. The data obtained by the receiving operation is used for the exclusive memory 2
Or to read the data stored in the dedicated memory 2 and transmit it to another station.

The transmission / reception circuit 1 is connected to a transmission line 6 for transmitting data to another station and a transmission line 7 for receiving data from another station, and a transmission / reception controller 8 for transmitting / receiving data and this transmission controller 8 are provided. When the scan data is transmitted, this is detected, the scan data to be transmitted is read from the scan memory 4 via the scan data dedicated receiving circuit 3, and the transmission / reception controller 8 in the FIFO (First In First Out) format. And a FIFO control circuit 9 for supplying the

When transmitting the scan data, the FIFO control circuit 9 reads the scan data to be transmitted from the scan memory 4 via the scan data dedicated receiving circuit 3, and the transmission / reception controller 8 transmits the scan data. Send it up and send it to another station. When data other than scan data is transmitted from another station via the transmission path 7, the transmission / reception controller 8 receives the data and supplies it to the dedicated memory 2 for storage, and also stores data other than scan data. At the time of transmission, the transmission / reception controller 8 reads out the data to be transmitted, which is stored in the dedicated memory 2, and sends it to the transmission path 6 to be transmitted to another station.

Further, the occupied memory 2 is a memory used as a storage area for data to be transmitted other than scan data and received data, and when a write command is output from the transmission / reception controller 8, it is accompanied by this write command. Capture the data that is supplied and store it,
When a read command is output from the transmission / reception controller 8, the data having the content designated by the read command is read and supplied to the transmission / reception controller 8.

The scan data dedicated receiving circuit 3 is connected to the transmission line 7, and the scan data receiving control circuit 10 for receiving the scan data, the operation of the scan data receiving control circuit 10 and the other device 5 and the transmitting / receiving circuit. 1 and an arbitration circuit 11 that arbitrates the operation thereof. When scan data is transmitted from another station and is supplied through the transmission path 7, the arbitration circuit 11 causes the other device 5 and the transmission / reception circuit 1 to operate. While adjusting the operation, the scan data reception control circuit 10 takes in the scan data, supplies the scan data to the scan memory 4 for storage, and the FIFO control circuit 9 of the transmission / reception circuit 1 outputs a read command. Then, the arbitration circuit 11 causes the other device 5 and the scan data reception control circuit 10 to operate. While settling, the scan memory 4
The scan data to be transmitted is read from and is supplied to the FIFO control circuit 9 of the transmission / reception circuit 1.

The scan memory 4 is a memory used as a storage area for the scan data to be transmitted and the scan data obtained by the receiving operation, and when the write command is output from the arbitration circuit 11, this write is performed. The scan data supplied together with the command is fetched and stored, and when the read command is output from the arbitration circuit 11, the scan data having the content designated by the read command is read and supplied to the arbitration circuit 11. To do.

The other device 5 is a device for performing various control operations, reading and displaying the received scan data, writing the scan data to be transmitted, and reading and writing other than the scan data to be transmitted. When using the scan data from another station, the scan data is read from the scan memory 4 through the arbitration circuit 11 of the scan data dedicated receiving circuit 3 and is used to perform the process. When transmitting to another station, the scan data is written in the scan memory 4 through the arbitration circuit 11 of the scan data dedicated receiving circuit 3 and transmitted to another station.

Next, the operation of this data transmitting / receiving apparatus will be described with reference to the block diagram shown in FIG.

<< When Transmitting Data Other Than Scan Data >> When transmitting data other than scan data, first, data other than the scan data output from the other device 5 is transmitted to the exclusive memory 2. After the data is written, a transmission request is issued to the transmission / reception controller 8.

As a result, the transmission / reception controller 8 reads the data written in the dedicated memory 2, sends it out on the transmission path 6 and transmits it to another station.

<< When Receiving Data Other than Scan Data >> If data other than scan data is transmitted from another station and is supplied through the transmission path 7, the transmission / reception controller 8 receives the data and , Write the received data in the dedicated memory 2.

<< When Sending Scan Data >>
When transmitting the scan data, first, the scan data to be transmitted, that is, the scan data output from the scan data dedicated receiving circuit 3 and the other device 5 is written in the scan memory 4, and then the transmission / reception controller 8
Is requested to send.

When the transmission / reception controller 8 outputs the address data to be transmitted, the FIFO
The control circuit 9 decodes this to determine which scan data has been accessed. Based on the result of this determination, the data output of the dedicated memory 2 is prohibited, and the scan data dedicated scanning circuit 3 scans via the arbitration circuit 11. The scan data to be transmitted is read from the memory 4, and is temporarily stored by the FIFO control circuit 9. At the same time, the scan data temporarily stored in the transceiver controller 8 in synchronization with the data fetch timing of the transceiver controller 8 is stored in the transceiver controller 8. After being transferred
It is sent out on the transmission path 6 and transmitted to another station.

<< When Scan Data is Received >>
If the scan data is transmitted from another station and is supplied through the transmission path 7, the scan data reception control circuit 10 detects this, the scan data is received, and the arbitration circuit 11 causes another device to receive the scan data. The scan data obtained by the receiving operation is stored in the scan memory 4 while the access to the scan memory 4 by the transmission line 5 and the transmission / reception circuit 1 is prohibited.

As described above, in this embodiment, when scan data is transmitted from another station,
When the scan data dedicated receiving circuit 3 receives this, the scan data obtained by this receiving operation is stored in the scan memory 4, and the scan data is transmitted to another station, the FIFO control of the transceiver circuit 1 is performed. Since the scan data to be transmitted stored in the scan memory 4 is read by the circuit 9 and transmitted to another station by the transmission / reception controller 8, the transmission / reception controller 8 can directly access it. Even when the memory capacity is smaller than the memory capacity used in the system, the scan memory used in the scan transmission method can be unified to facilitate operations such as addition and deletion of scan blocks, and the transmission / reception controller 8
The scan memory 4 can be accessed without using side arbitration.

[0044]

As described above, according to the present invention, even when the memory capacity that can be directly accessed by the transmission / reception controller is smaller than the memory capacity used in the system, the scan memory used in the scan transmission method is used. It is possible to unify the operation of the scan block to facilitate operations such as addition and deletion of scan blocks, and to access the scan memory without using arbitration on the transmission / reception controller side.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a data transmitting / receiving apparatus according to the present invention.

FIG. 2 is a block diagram showing an example of a conventionally known data transmission / reception device of a scan transmission system.

[Explanation of symbols]

 1 Transmitter / Receiver Circuit 2 Exclusive Memory 3 Scan Data Dedicated Receiver Circuit 4 Scan Memory 5 Other Equipment 6, 7 Transmission Line 8 Transmit / Receive Controller 9 FIFO Control Circuit 10 Scan Data Reception Control Circuit 11 Arbitration Circuit

Claims (1)

[Claims] 1. A scan data dedicated receiving circuit for receiving scan data when another data transmitting / receiving device transmits the scan data, and scan data received by the scan data dedicated receiving circuit and scan data to be transmitted. When transmitting scan data to the stored scan memory and other data transmission / reception device, the scan data to be transmitted stored in the scan memory is read out in the FIFO format and is sent to another data transmission / reception device. A data transmission / reception device, comprising: a transmission / reception circuit for transmitting.