JP3277016B2 - Data transceiver - Google Patents

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 systems.

[0002]

2. Description of the Related Art In a data transmitting / receiving apparatus for transmitting / receiving data, a memory capacity that can be occupied by a transmitting / receiving controller for controlling a transmitting / receiving operation cannot be made larger than a capacity determined by the number of address lines of the transmitting / receiving controller.

For this reason, in a system in which a larger number of transmission / reception blocks are required for this limited memory capacity, the transmission memory and the reception memory are separated so that the data transmission When the transmission data is stored in the memory of, the data is read out by the transmission / reception controller and sent out on the transmission line, and when the data is received,
The data on the transmission path is fetched by a reception-only circuit provided independently of the transmission / reception controller, and stored in a reception memory.

Thus, 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.

A data transmission / reception apparatus that employs a scan transmission method, which is one of the broadcast communication methods, apparently has a basic operation of the scan transmission method in which all stations can access one memory. In order to satisfy this, the transmission and reception memory must be one.

For this reason, when performing an operation such as addition or deletion of a scan block, logic for performing complicated processing such as moving data in a reception memory to a transmission memory is required.

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

The data transmitting / receiving apparatus shown in FIG. 1 includes a transmitting / receiving circuit 101, a receiving circuit for exclusive use of scan data 102, and another device 103. When the scan data is transmitted from another station, the receiving / receiving circuit for exclusive use of scan data is used. The circuit 102 receives the data and stores the received data. When transmitting scan data or data other than scan data to another station or receiving data other than scan data, the transmission / reception circuit 101 The transmission / reception of data is performed to transmit data to be transmitted, or the data is received and stored.

A transmission / reception circuit 101 is connected to a transmission line 104 for transmitting data to another station and a transmission line 105 for receiving data from another station, and a transmission / reception controller 106 for transmitting / receiving data. An arbitration circuit 107 that arbitrates the operation and the operation of the other device 103 or the dedicated scan data receiving circuit 102; and transmission data (scan data or scan data) output from the dedicated scan data receiving circuit 102 or other device 103. A transmission memory for reading and storing the stored data when a read command is supplied from the transmission / reception controller 106, and supplying the read data to the transmission / reception controller 106 via the arbitration circuit 107. 108.

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

[0011] Further, the scan data dedicated receiving circuit 102
Is a scan data reception control circuit 109 connected to the transmission path 105 for performing scan data reception processing, and an arbitration circuit for arbitrating the operation of the scan data reception control circuit 109 and the operation of another device 103 or the transmission / reception circuit 101 110 and the arbitration circuit 1 when scan data is received by the scan data reception control circuit 109.
And a receiving memory 111 for temporarily storing the data via the memory 10 and temporarily storing the data.

When the scan data is transmitted from another station and supplied via the transmission line 105, the arbitration circuit 110 controls the scan data reception control while adjusting the operation with the other device 103 and the transmission / reception circuit 101. The scan data is fetched by the circuit 109 and stored in the reception memory 111.

The other device 103 is a device for performing various control operations and displaying data. When using scan data from another station, the other device 103 reads out the scan data from the reception memory 111 and transfers the read data. When the scan data is used to transmit the scan data to another station, the transmission memory 108 is used.
Then, the scan data is written in and transmitted 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, data to be transmitted is first stored in the transmission memory 108.
That is, after data other than the scan data output from the dedicated scan data receiving circuit 102 or the other device 103 is written, a transmission request is issued to the transmission / reception controller 106.

Thus, the transmission / reception controller 106
Operates the arbitration circuit 107 to adjust the operation with the dedicated scan data receiving circuit 102 and other devices 103,
The data written in the transmission memory 108 is read out, sent out on the transmission line 104, and transmitted to another station.

<< Receiving Data Other than Scan Data >> Further, if data other than scan data is transmitted from another station and supplied via the transmission line 105, the transmission / reception controller 106 receives the data. Then, the received data is written to the transmission memory 108 while the arbitration circuit 107 is operated to adjust the operation with the dedicated scan data receiving circuit 102 and other devices 103.

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

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

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

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

[0022]

However, the above-mentioned conventional data transmitting / receiving apparatus 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,
The transmission / reception memory is the transmission memory 108 and the reception memory 1
Since the transmission memory 108 and the reception memory 111 are individually managed, switching processing and arbitration processing of transmission / reception operations become complicated, thereby complicating the circuit configuration. There was a problem that would.

The transmission / reception memory is used as the transmission memory 108.
When the system needs to increase or decrease the number of scan blocks for function expansion or function reduction, the reception memory 111
This requires a circuit change with respect to the transmission memory 108 in accordance with the number of scan blocks, so that this cannot be easily performed.

In view of the above circumstances, the present invention unifies the scan memory used in the scan transmission system even when the memory capacity directly accessible by the transmission / reception controller is smaller than the memory capacity used in the system. It is an object of the present invention 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 comprises a receiving circuit for exclusive use of scan data for receiving, when scan data is transmitted from another data transmitting / receiving apparatus, The scan memory that stores the scan data received by the dedicated scan data receiving circuit and the scan data to be transmitted is stored in the scan memory when the scan data is transmitted to another data transmitting / receiving device. A transmission / reception circuit for reading scan data to be transmitted in a FIFO format and transmitting the read scan data to another data transmission / reception device is provided.

[0027]

In the above arrangement, when scan data is transmitted from another data transmission / reception device, it is received by a dedicated scan data reception circuit and stored in the scan memory, and the scan data is transmitted to the other data transmission / reception device. When transmitting, scan data to be transmitted stored in the scan memory is read out in a FIFO format by a transmission / reception circuit and transmitted to another data transmission / reception device.

[0028]

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

The data transmitting / receiving apparatus shown in FIG. 1 includes a transmitting / receiving circuit 1, an occupied memory 2, a receiving circuit for exclusive use of scan data 3, a scan memory 4, and another device 5. Is transmitted by the dedicated scan data receiving circuit 3, the scan data obtained by this receiving operation is stored in the scan memory 4, and when the scan data is transmitted to another station, the transmission / reception is performed. The scan data to be transmitted stored in the scan memory 4 is read out by the circuit 1 and transmitted to another station. When data other than the scan data is transmitted and received, the data is received and transmitted by the transmission / reception circuit 1. The data obtained by the receiving operation is stored in the occupied memory 2
Or read data stored in the occupied 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. When the scan data is transmitted, the transmission data is detected, the scan data to be transmitted is read from the scan memory 4 via the scan data dedicated reception circuit 3, and the transmission / reception controller 8 is transmitted in a FIFO (First In First Out) format. And a FIFO control circuit 9 for supplying the data to the controller.

When transmitting the scan data, the FIFO control circuit 9 reads out 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 up and transmit to other stations. When data other than scan data is transmitted from another station via the transmission path 7, the data is received by the transmission / reception controller 8 and supplied to the occupation memory 2 for storage. At the time of transmission, the transmission / reception controller 8 reads out the data to be transmitted stored in the occupation memory 2 and sends it out onto the transmission line 6 to be transmitted to another station.

The occupied memory 2 is a memory used as a storage area for data to be transmitted other than scan data and received data. When a write command is output from the transmission / reception controller 8, the occupied memory 2 is used together with the write command. Captures the supplied data and stores it,
When a read command is output from the transmission / reception controller 8, data having the content specified 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 performs a scan data receiving process. The scan data reception control circuit 10 operates the scan data reception control circuit 10 in accordance with other devices 5 and transmission / reception circuits. And an arbitration circuit 11 that arbitrates the operation with the other device 1. When the scan data is transmitted from another station and supplied via the transmission path 7, the arbitration circuit 11 causes the other device 5 or the transmission / reception circuit 1 to transmit. While adjusting the operation, the scan data is received by the scan data reception control circuit 10 and supplied to and stored in the scan memory 4. A read command is output from the FIFO control circuit 9 of the transmission / reception circuit 1. , The arbitration circuit 11 operates with the other device 5 and the scan data reception control circuit 10. While settling, the scan memory 4
The scan data to be transmitted is read out from the CPU and 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 scan data to be transmitted or scan data obtained by a reception operation. When a write command is output from the arbitration circuit 11, the write The scan data supplied together with the command is fetched and stored, and when a read command is output from the arbitration circuit 11, the scan data specified by the read command is read and supplied to the arbitration circuit 11. I do.

The other devices 5 are devices that perform various control operations, read and display of received scan data, write scan data to be transmitted, and read and write data other than scan data to be transmitted. When using the scan data from another station, the scan data is read out from the scan memory 4 via the arbitration circuit 11 of the scan data dedicated receiving circuit 3 and is used for processing. When transmitting to the other station, the scan data is written to the scan memory 4 via the arbitration circuit 11 of the scan data dedicated receiving circuit 3 and transmitted 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 occupation memory 2, that is, data other than scan data output from the other device 5. 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 occupied memory 2, sends it out onto the transmission line 6, and transmits it to another station.

<< Receiving Data Other than Scan Data >> Further, if data other than scan data is transmitted from another station and supplied via the transmission line 7, the transmission / reception controller 8 receives the data. , And writes the received data to the occupation memory 2.

<< When transmitting scan data >>
When transmitting scan data, first, scan data to be transmitted, that is, scan data output from the dedicated scan data receiving circuit 3 or another device 5 is written in the scan memory 4, and then transmitted and received by the transmission / reception controller 8.
A transmission request is issued to.

When the transmission / reception controller 8 outputs the address data to be transmitted, the FIFO
This is decoded by the control circuit 9 to determine which scan data is accessed. Based on the result of the determination, the data output of the occupied memory 2 is prohibited, and the scan data is transmitted via the arbitration circuit 11 of the dedicated scan data receiving circuit 3. Scan data to be transmitted is read from the memory 4 and temporarily stored by the FIFO control circuit 9, and the scan data temporarily stored in synchronization with the data fetch timing of the transmission and reception controller 8 is transmitted to the transmission and reception controller 8. After being transferred,
The data is transmitted on the transmission line 6 and transmitted to another station.

<< In case of receiving scan data >>
When scan data is transmitted from another station and supplied via the transmission path 7, the scan data is detected by the scan data reception control circuit 10 and the scan data is received. The scan data obtained by the reception operation is stored in the scan memory 4 while access to the scan memory 4 by the transmission circuit 5 and the transmission / reception circuit 1 is prohibited.

As described above, in this embodiment, when the scan data is transmitted from another station,
This is received by the scan data dedicated receiving circuit 3, the scan data obtained by this receiving operation is stored in the scan memory 4, and when the scan data is transmitted to another station, the FIFO control of the transmitting and receiving circuit 1 is performed. Since the scan data to be transmitted stored in the scan memory 4 is read out by the circuit 9 and is transmitted to another station by the transmission / reception controller 8, it can be directly accessed by the transmission / reception controller 8. 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, and operations such as addition and deletion of scan blocks can be easily performed.
The scan memory 4 can be accessed without using arbitration on the side.

[0044]

As described above, according to the present invention, even when the memory capacity directly accessible 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. , And operations such as addition and deletion of scan blocks can be facilitated, and the scan memory can be accessed without using arbitration on the transmission / reception controller side.

[Brief description of the 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 data transmission / reception device of a scan transmission system which is conventionally known.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmission / reception circuit 2 Occupied memory 3 Scan data exclusive reception circuit 4 Scan memory 5 Other equipment 6, 7 Transmission line 8 Transmission / reception controller 9 FIFO control circuit 10 Scan data reception control circuit 11 Arbitration circuit

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04L 29/00 G06F 13/00 G06F 12/00

Claims (1)

(57) [Claims] When a scan data is transmitted from another data transmission / reception device, a dedicated scan data receiving circuit for receiving the scan data, and the scan data received by the dedicated scan data receiving circuit and the scan data to be transmitted are transmitted. When transmitting scan data to the stored scan memory and another data transmission / reception device, the scan data to be transmitted stored in the scan memory is read out in a FIFO format and is read out to another data transmission / reception device. A data transmitting / receiving device, comprising: a transmitting / receiving circuit for transmitting.