JP2000165418A - Network controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To halve a storage capacity required for a frequency band management table in the network controller that uses a token to conduct frequency band management of a network. SOLUTION: A sequencer to control a network consisting of a master station and a plurality of slave stations is provided with a register 105 that stores a communication request from each station and a station number of a communication destination. A 4-bit counter 106 counts number of times of data communication token packet outputs. A token packet generating circuit 103 generates a token packet on the basis of data in the register 105 and data of the 4-bit counter 106. The frequency band of the network can be managed with a few register capacities by using a counter to count number of times of token packets outputted to a channel so as to realize a virtual frequency band management table.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network control device in a network comprising a master station and a plurality of slave stations, and more particularly to a network for performing data communication while managing a network band using a token management table. It relates to a control device.

[0002]

2. Description of the Related Art In recent years, with the development of LAN (Local Area Network), information devices such as computers and multimedia devices have been connected to a network, and data of the devices has been transmitted to distant devices. Devices for connecting a computer to a network have begun to spread.

[0003] In these devices, in a network composed of a master station and a plurality of slave stations, a master station having a token management table for data communication confirms a network transmission request from the plurality of slave stations. After outputting the inquiry token packet of the above, an identification signal for identifying the communication request packet slot allocated to the plurality of slave stations is output, and when the slave station transfers its own data to another station, the identification signal is output. Is detected, and when it is determined that the slot is the node's own slot, data indicating that there is a transmission request and the number data of the destination station are output to the line. After recording the content of the token in the data communication token management table, the data communication token packet is There is a network controller that outputs to the line while complying with the value of the token management table. In this type of network control device, for example,
A network control is realized by a method as described in Japanese Patent Application Laid-Open No. 145406.

FIG. 9 shows a conventional network control device for performing data communication while managing a network band using a token management table in a network composed of a master station and a slave station. In this conventional example, the number of stations connected to the network is 64, the number of times that the master station can acquire the contents of the communication request packet slot at a time is 16 stations, and the number of stations connected to the network is four. Let's say they are split. Also,
As an example, station 1 of set 0 has a transfer request to station 15 of set 2, station 2 of set 0 has a transfer request to station 14 of set 3, and
Station 0 and stations 3 to 16 have no transfer request.

In FIG. 9, a data reading circuit 901 is a circuit that reads serial data from a line and converts it into parallel data in a sequencer in a network control device. The control circuit 902 is a circuit that controls a sequencer in the network control device. The token packet creation circuit 903 is a circuit that creates a token packet to be output to a line in a sequencer in the network control device. The timer 904 is a timer of a sequencer in the network control device. The register 905 is a register of the token management table for data communication of the sequencer in the network control device. 2-bit counter 90
Reference numeral 6 denotes a counter indicating a set of transfer sources of the sequencer in the network control device. The ROM 907 is a ROM (Read-Only Memory) that stores a program indicating a control procedure of the control circuit 902 of the sequencer in the network control device.
It is. The data output circuit 908 is a circuit that converts parallel data into serial data and outputs the serial data to a line in a sequencer in the network control device.

A data reading circuit 901, a control circuit 902, a token packet creating circuit 903, a timer 904, a register 905,
The bit counter 906 and the data output circuit 908 constitute a sequencer that outputs an inquiry token and a data transfer token to a line. The method of outputting the inquiry token and the data transfer token is realized by a program recorded in the ROM 907.

FIG. 10 is a diagram showing a flow of a packet on a line in a conventional network control device. FIG.
, The token packet 1001 is an inquiry token packet. The content of the packet is serial data “11 1111 11 1111”. The slot 1002 is a packet slot for a communication request packet, and has a plurality of slots. The content of each slot is serial data “1AXXXXXX”, the first “1” is a slot identification bit, and “A” next to “1” is “1” when there is a transmission request. "And there is no transmission request,
It becomes “0”. The remaining “XXXXXX” indicates a group number and a station number. Each node inserts the communication request packet into the assigned communication request packet slot 1002.

[0008] The token packet 1003 is a token packet for data communication. The content of the packet is serial data and indicates "XXXXXXYYYYYY". First “XXXXXX”
Indicates the group number and station number of the destination, and the next “YYYYY
"Y" indicates the group number and station number of the transmission source. The data packet 1004 is a packet for transmitting data. The contents of the packet "XXX ... XXXX" are the serial numbers output by the transmission station. Data.

FIG. 11A is a diagram showing the specifications of the data of the token table for data communication recorded in the register 905. In FIG. 11A, bits 0 to 3 as the SNA indicate the source station number, bits 4 to 5 as the SLA indicate the source set, and bits 6 to 9 as the DNA indicate the destination station. Bits 10 to 11 as DLA indicate a set of transmission destinations, and bit 12 as A indicates that there is a transmission request.

The operation of the conventional network controller configured as described above will be described below. When the timer 904 determines that it is time to output a token packet, the sequencer uses the data output circuit 908 to output an inquiry token packet 1001 for set 0 to the line. Next, when the timer 904 determines that it is time to output an identification signal for identifying the slot 1002 for the communication request packet allocated to each station, the timer 904 outputs an identification signal for identifying the slot 1002 to the line. . Each station connected to the line sends an inquiry token packet 10
01, determines that it is time to output a transmission request to the master station, receives an identification signal for identifying the slot 1002 for a communication request packet, and determines that the slot is for its own station. Is output to the line, indicating that there is a number, and the number of the destination station.

A data reading circuit 901 reads the data of the communication request packet slot 1002 into the sequencer,
Record in the register 905. The master station registers 905
Next, as shown in FIG. 11A, the contents of the slot for the communication request packet are recorded. The register 905 has 0 to 15 words with one word being 12 bits. Data reading circuit
901 stores the data of the communication request packet slot 1002,
Store in each word. For example, station 1 in set 0
When transmitting data to the station 15 of the set 2 from the group, as the value of the word 1, SNA is set to "0001", SLA is set to "00", DNA is set to "1111", and DLA is set to "10".
And A becomes “1”. For example, when transmitting data from station 2 in group 0 to station 14 in group 3, as the value of word 2, SNA is set to "0010", SLA is set to "00", and DNA is set to "1110". Then, DLA is set to "11" and A is set to "1".

After the master station records all the communication request packet slots in the register 905, the 2-bit counter 906 increments the count by one. Therefore, the value of the register 905 changes to a value as shown in FIG. 11A to FIG. 11B. Next, when the master station determines that the time of the timer 904 has reached the time for outputting the token packet to the line, the master station transfers a value other than the MSB of the register 905 to the token packet creation circuit 903, and the token packet creation circuit 903 A token packet is created, and the data output circuit 908 generates a token packet 100 for data communication.
Outputs 3. The token packet creation circuit 903 has a 12-bit register, and stores the value of the register 905 from 12 bits to 0 bits. The data output circuit 908 converts the data of the token packet creation circuit 903 from parallel to serial while
Output 03 to the line.

After the master station outputs the token packet 1003 for data communication, each station receives the token packet 1003 for data communication. Thereafter, the token is analyzed, and it is determined whether it is time to transmit data, receive data, or transmit / receive data to / from another station.
For example, when the own station is determined to be the transmitting station, the data packet 10
Outputs 04.

Next, the network bandwidth is managed using the token management table in the apparatus shown in FIG.
FIG. 12 shows a detailed control procedure for performing data communication. At the start of this control procedure, the timer 904, register 9
05, the 2-bit counter 906 is set to the initial value 0.

First, the sequencer acquires the value of the timer 904 (S1201), and determines whether it is the token packet output time (S1202). If it is not the token packet output time, the value of the timer 904 is acquired again (S12
01). If it is the token packet output time, a token packet is created from the token packet creation circuit 903, an inquiry token packet is output to the line from the data output circuit 908 (S1203), the value of the timer 904 is obtained, and the identification bit is obtained. Determine whether it is the output time (S1
205).

If it is not the identification bit output time, the value of the timer 904 is obtained again (S1204). If it is the identification bit output time, the identification bit is output by the data output circuit 908 (S1206), the data from the line is acquired by the data reading circuit 901 (S1207), and the slot data is stored in the DLA, Retained in DNA, S
LA holds the pointer value of the current table, and SN
A holds the counter value (S1209), acquires the pointer value of the table of the register 905 (S1210), and determines whether the pointer value of the table is 16 (S1211).

If the value of the table pointer is not 16, one is added to the pointer of the table (S1212), and the flow shifts to S1204 to acquire the data of the next slot.
If the value of the table pointer is 16, the value of the timer 904 is obtained (S1213), and it is determined whether or not it is the output time of the token packet for data communication (S1214).

If the time is not the token packet output time for data communication, the process returns to step S1213 to acquire the timer value again.
To. If it is the data communication token packet output time, the transmission request bit in the table of the register 905 is obtained, and it is determined whether or not the transmission request bit is “1” indicating the transmission request (S1216).

When there is no transmission request, the pointer of the table of the register 905 is incremented by one (S1218), and the transmission request bit of the table is confirmed again (S1215). If there is a transmission request, the value of the register 905 is transferred to the token packet creation circuit 903, a token packet for data communication is created, and a token packet for data communication is issued from the data output circuit 908 (S1217). One of the table pointers is added (S1219), and the register 905
The pointer value of the table is obtained (S1220), and the register 9
It is determined whether the pointer value of the table of 05 is 16 (S1221).

If the pointer value in the table is not 16, the value of the timer is obtained to check whether it is the output time of the token packet for data communication (S1213). If the pointer value in the table is 16, the counter is incremented by 1 (S1
222), and obtain the value of the timer to confirm whether it is the output time of the inquiry token packet (S120).
1).

[0021]

However, in the above configuration, when the number of times that the master station can acquire the contents of the communication request packet slot at a time is 16 stations, and the number of stations connected to the network is 16, , The table size is 1
It is necessary to prepare 16 storage elements having a word length of 9 bits, the circuit size is large, and a 144-bit data storage means that consumes a large amount of power is used, thereby reducing the cost of digital circuits and reducing power consumption. This has been a major obstacle to realization.

Further, when the number of times that the master station can acquire the contents of the communication request packet slot at a time is 16 stations and there are 64 stations connected to the network, the number of stations connected to the network is reduced to four sets. In order to divide the table, it is necessary to prepare 16 storage elements having a length of 13 bits per word, which requires a large circuit size and uses 208 bits of data storage means which consumes a lot of power. This has been a major obstacle to reducing the cost of digital circuits and reducing power consumption.

The present invention has been made in consideration of the above problems, and has as its object to reduce the required storage capacity of a bandwidth management table in a network control device that performs bandwidth management by half.

[0024]

In order to solve the above problems, the present invention has a data communication token management table and outputs an inquiry token packet for confirming a network transmission request of a plurality of slave stations. After that, an identification signal for identifying the communication request packet slot allocated to the plurality of slave stations is output, and the content of the communication request packet slot is recorded in the data communication token management table, and then the data communication is performed at regular intervals. Station that outputs a token packet to the line based on the value of the token management table for data communication, and when transferring its own data to another station, detects the identification signal and is the slot of its own node. When it is determined that there is a transmission request, there are a plurality of A network control device for controlling a network composed of a slave station, data reading means for reading serial data from the line, data output means for outputting transmission data to the line, and a communication request slot in the read data. A data storage unit for storing data, a count unit for storing the number of times the data communication token packet is output to the line, and a data communication token packet based on the data in the data storage unit and the count value of the count unit. And a token packet creating means.

With this configuration, a token packet can be created using a virtual band management table realized by combining the number of times a token packet for data communication is output to a line and data of a communication request slot. Network bandwidth management can be performed with storage capacity.

Further, the apparatus includes a token management table for data communication, outputs an inquiry token packet for confirming a network transmission request of a plurality of slave stations, and identifies a communication request packet slot allocated to the plurality of slave stations. After the identification signal is output, the contents of the slot for the communication request packet are recorded in the token management table for data communication, and then the token packet for data communication is sent to the line at regular intervals based on the value of the token management table for data communication. If the number of stations connected to the network is larger than the number of stations that can be handled by one inquiry, the stations connected to the network are grouped, and the inquiry token packet and data communication token The master station that outputs packets and the data of its own station are transferred to other stations. If, it detects an identification signal, and,
A network for controlling a network composed of data indicating that there is a transmission request and a plurality of slave stations outputting number data of a destination station to the line when the slot is determined to be a slot of the own node. Control device,
Data reading means for reading serial data from a line, data output means for outputting transmission data to the line, data storage means for holding data of a communication request slot in the read data, and a token packet for data communication to the line. A first counting means for holding the number of outputs, a second counting means indicating a set for measuring the number of carry-out occurrences of the first counting means and outputting a packet, a data storage means and a first counting means; And a token packet creating means for creating a data communication token packet based on the data of the second counting means.

With this configuration, the number of times the token packet for data communication is output to the line, the number of times a carry-out occurs when the number of outputs is counted, and
A token packet is created using a plurality of virtual bandwidth management tables realized by combining data of communication request slots, and bandwidth management of a network can be performed with a small storage capacity.

[0028]

The invention according to claim 1 of the present invention includes a token management table for data communication, and outputs an inquiry token packet for confirming a network transmission request of a plurality of slave stations. After outputting an identification signal for identifying a communication request packet slot allocated to a plurality of slave stations and recording the contents of the communication request packet slot in the data communication token management table, the data communication is performed at regular intervals. A master station that outputs a token packet to a line based on the value of the token management table for data communication, and when transferring its own data to another station, detects the identification signal, and
A network for controlling a network composed of data indicating that there is a transmission request and a plurality of slave stations outputting number data of a destination station to the line when the slot is determined to be a slot of the own node. In the control device, data reading means for reading serial data from the line, data output means for outputting transmission data to the line, data storage means for holding data of a communication request slot in the read data, and a token packet for data communication. A network control device comprising: a counting unit that holds the number of times of output to the line; and a token packet creating unit that creates a token packet for data communication based on the data in the data storage unit and the count value of the counting unit. Yes, combining the value of the sequencer's counting means with the value of the data storage means Thereby realizing a virtual bandwidth management table of, an effect that output to the line to create a token packet using the bandwidth management table of the virtual.

The invention according to a second aspect of the present invention comprises a data communication token management table, and outputs an inquiry token packet for confirming a network transmission request of a plurality of slave stations, and then outputs the inquiry token packet to the plurality of slave stations. After outputting an identification signal for identifying the communication request packet slot allocated to the communication request packet slot and recording the content of the communication request packet slot in the data communication token management table, the data communication token packet is transmitted at regular intervals. Output to the line based on the value of the token management table for data communication, the number of stations connected to the network,
If the number of stations that can be handled by a single inquiry is larger than the limit, the stations connected to the network are grouped, and the master station that outputs the inquiry token packet and the data communication token packet for each group and the data of its own station When transferring to another station, the identification signal is detected, and when it is determined that the slot is the own node, the data indicating that a transmission request exists and the number data of the transmission destination station are transmitted to the line. In a network control device for controlling a network composed of a plurality of slave stations that output data, a data reading unit that reads serial data from a line, a data output unit that outputs transmission data to a line,
Data storage means for holding the data of the communication request slot in the read data; first counting means for holding the number of times the data communication token packet is output to the line; and the number of carry-outs of the first counting means. A second counting means for indicating a set for measuring and outputting a packet; the data storage means; the first counting means;
And a token packet creating means for creating a data communication token packet based on the data of the counting means.
By combining the value of the counting means, the value of the second counting means, and the value of the data storage means, a number of virtual bandwidth management tables are realized, and a token packet is created using the virtual bandwidth management table. And output to the line.

According to a third aspect of the present invention, after the master station having the token management table for data communication outputs an inquiry token packet for confirming a network transmission request of a plurality of slave stations, After outputting an identification signal for identifying a communication request packet slot allocated to a plurality of slave stations and recording the contents of the communication request packet slot in the data communication token management table, the data communication is performed at regular intervals. Output the token packet to the line based on the value of the token management table for data communication, the plurality of slave stations,
When transferring own station data to another station, when the identification signal is detected and when it is determined that the slot is the own node slot, data indicating that a transmission request exists and the number data of the destination station In a network control method for controlling a network that outputs a line to a line, serial data from the line is read, data of a communication request slot in the read data is stored in a storage device, and transmission data is output to the line. A network control method that counts the number of times a communication token packet is output to a line and creates a data communication token packet based on data in a communication request slot and the number of times a data communication token packet is output to a line. Bandwidth management data by combining the number of times a token packet is output to the line and the data in the communication request slot. Achieve Bull, an effect that output to the line to create a token packet using the bandwidth management table of the virtual.

The invention according to claim 4 of the present invention is characterized in that the master station having the token management table for data communication outputs an inquiry token packet for confirming a network transmission request of a plurality of slave stations, After outputting an identification signal for identifying a communication request packet slot allocated to a plurality of slave stations and recording the contents of the communication request packet slot in the data communication token management table, the data communication is performed at regular intervals. Is output to the line based on the value of the token management table for data communication, and if the number of stations connected to the network is larger than the limit number of stations that can be handled by one inquiry, Stations, and the inquiry token packet and the data communication When a plurality of slave stations output their own packets and transfer their own data to another station, when the identification signal is detected and when it is determined that the slot is a slot of the own node, a transmission request exists. In a network control method for controlling a network which outputs data indicating the number and the number data of a destination station to a line, serial data is read from the line, and data of a communication request slot in the read data is stored in a storage device. The transmission data is output to the line, the number of times the data communication token packet is output to the line is counted, and the carry-out occurrence count of the data communication token packet output number counting to the line is measured. Is output, and the data of the communication request slot in the read data and the data communication token packet are output to the line. A network control method for creating a data communication token packet based on the number of times and the number of carry-out occurrences, the number of times the data communication token packet is output to the line, the number of carry-outs of the output number counting, and the communication request slot. By combining these data, a virtual bandwidth management table having a number of sets is realized, and a token packet is created by using the virtual bandwidth management table and output to a line.

According to a fifth aspect of the present invention, after the master station having the token management table for data communication outputs an inquiry token packet for confirming a network transmission request of a plurality of slave stations, After outputting an identification signal for identifying a communication request packet slot allocated to a plurality of slave stations and recording the contents of the communication request packet slot in the data communication token management table, the data communication A token packet is output to the line based on the value of the token management table for data communication, and the plurality of slave stations detect an identification signal when transferring data of the own station to another station,
And a recording medium for recording a program for controlling a network for outputting data indicating that a transmission request is present and number data of a destination station to a line when the slot is determined to be a slot of the own node. It stores the data of the request packet slot, counts the number of times the data communication token packet is output to the line, and counts the number of times that the communication request packet slot data and the data communication token packet are output to the line. Is a network control program recording medium that records a network control program that outputs transmission data to a line, realizes a virtual bandwidth management table, and creates a token packet by using the virtual bandwidth management table. Hold the network control program to be output to the line and It has the effect that supplied to Yuta.

The invention according to claim 6 of the present invention is characterized in that the master station having the data communication token management table outputs an inquiry token packet for confirming a network transmission request of a plurality of slave stations, After outputting an identification signal for identifying a communication request packet slot allocated to a plurality of slave stations and recording the contents of the communication request packet slot in the data communication token management table, the data communication The token packet is output to the line based on the value of the token management table for data communication, and if the number of stations connected to the network is larger than the limit number of stations that can be handled by one inquiry, it is connected to the network. Stations are grouped, and the inquiry token packet and the data communication When the slave stations transmit their own data to another station, the slave station detects the identification signal and determines that the slot is a slot of its own node. A communication request packet slot in a recording medium storing a program for controlling a network for outputting data indicating that the communication is to be performed and the number data of a destination station to a line, and storing a token for data communication to the line. The number of packet outputs is counted, the transmission data is output to the line, the number of carry-outs indicating that the number of times the data communication token packet has been output to the line has been counted is measured, and the data of the communication request slot and the data are counted. A network for creating a token packet based on the number of times a communication token packet is output to a line and the number of carry-out occurrences. A network control program recording medium on which a work control program is recorded. A network control program that realizes a number of virtual bandwidth management tables, creates a token packet using the virtual bandwidth management table, and outputs the token packet to a line. Has the effect of storing and supplying it to the computer.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described in detail with reference to FIG.

(First Embodiment) A first embodiment of the present invention is based on data of a communication request slot in data read from a line and the number of times a data communication token packet is output to the line. Is a network control device that creates a data communication token packet.

FIG. 1 shows a basic configuration of a network control device according to the first embodiment of the present invention. In FIG. 1, a data reading circuit 101 is a circuit of a sequencer in a network control device that reads serial data from a line and converts the data into parallel data. The control circuit 102 is a circuit that controls a sequencer in the network control device. Token packet creation circuit 103
Is a circuit of a sequencer in the network control device that creates a token packet to be output to the line. Timer
Reference numeral 104 denotes a timer of a sequencer in the network control device. The register 105 is a register of the token management table for data communication of the sequencer in the network control device. The 4-bit counter 106 is a counter that indicates the number of token outputs of the sequencer in the network control device. The ROM 107 is a ROM (Read-Only Memory) that stores a program indicating a control procedure of the control circuit 102 of the sequencer in the network control device. The data output circuit 108 is a sequencer circuit in the network control device that converts parallel data into serial data and outputs the serial data to a line.

The data reading circuit 101, the control circuit 102, the token packet creating circuit 103, the timer 104, the registers 105,
The bit counter 106 and the data output circuit 108 constitute a sequencer that outputs an inquiry token and a data transfer token to a line. The method of outputting the inquiry token and the data transfer token is realized by a program recorded in the ROM 107.

In this embodiment, the number of stations connected to the network is 16, and the number of times that the master station can acquire the contents of the communication request packet slot at a time is 16 stations. Further, as an example, a case will be described where the station 1 has a transfer request to the station 15, the station 2 has a transfer request to the station 14, and the stations 0 and 3 to the station 16 have no transfer request.

FIG. 2 is a diagram showing a flow of a packet on a line. In FIG. 2, a token packet 201 is an inquiry token packet. The content of the packet is “1111 1111” in serial data. Slot 202
This is a packet slot for a communication request packet, and there are a plurality of slots. The content of each slot is serial data "1AXXXX", the first "1" is a slot identification bit, the "A" following "1" is a bit indicating a transmission request, and If there is, there is "1", and if there is no transmission request, it becomes "0". The remaining “X
XXX "indicates a station number. Each node inserts a communication request packet into the assigned communication request packet slot 202. A token packet 203 is a token packet for data communication. The data indicates “XXXXYYYY.” The first “XXXX” indicates the set number and station number of the transmission destination, and the next “YYYY” indicates the set number and station number of the transmission source. This is a packet for data transmission. Packet content "XXX @ XXX
X "is the serial data output by the transmitting station.

FIGS. 3A and 3B are diagrams showing the specifications of the data of the token table for data communication recorded in the register 105. In FIG. 3, bit 0 which is DNA
To bit 3 indicate the station number of the transmission destination, and bit 4 as A indicates that there is a transmission request.

The operation of the network control device configured as described above will be described below. When the sequencer determines that it is time to output the token packet by the timer 104, the sequencer uses the data output circuit 108 to output the inquiry token packet 201 to the line. next,
When it is determined by the timer 104 that it is time to output an identification signal for identifying the communication request packet slot 202 allocated to each station, an identification signal for identifying the slot 202 is output to the line.

Each station connected to the line receives the inquiry token packet 201, determines that it is time to output a transmission request to the master station, and sends an identification signal for identifying a slot 202 for a communication request packet. Upon receiving and determining that the slot is the own station, the data indicating that there is a transmission request and the number of the destination station are output to the line.

The data reading circuit 101 records the data of the communication request packet slot 202 in the register 105 and records the contents of all the communication request packet slots in the register 105 as shown in FIG. 3A. The register 105 has 0 to 15 words with one word being 5 bits. For example, when data is transmitted from station 1 to station 16, the value of word 1 is D
NA is set to “11 °”, and A becomes “1”. For example, when data is transmitted from the station 2 to the station 15, DNA is set to "1110" and A is set to "1" as the value of the word 2. Therefore, the value of the register 105 changes from FIG. 3A to a value as shown in FIG. 3B.

The master station records all communication request packet slots in the register 105. Next, when the master station determines that the time of the timer 104 has reached the time for outputting the token packet to the line, the master station compares the value of the register 105 and the value of the 4-bit counter 106 with the token packet creation circuit 1.
03, the token packet creation circuit 103 creates a token packet, and the data output circuit 108 outputs a token packet 203 for data communication.

The token packet creation circuit 103 has an 8-bit register, stores values other than the MSB of the register 105 from 7 bits to 4 bits, and stores a 4-bit counter value.
The value of 6 is stored from 3 bits to 0 bits. The data output circuit 108 outputs the token packet 203 for data communication to the line while converting the data of the token packet creation circuit 103 from parallel to serial.

After the master station outputs the token packet 203 for data communication, each station receives the token packet 203 for data communication, analyzes the token, and determines whether it is time for the own station to transmit data. It is determined whether it is time for reception or time for transmission / reception of another station. For example, when the own station is determined to be the transmitting station, it outputs the data packet 204.

Next, FIG. 4 shows a detailed control procedure for performing data communication while managing the network band using the token management table in the apparatus shown in FIG. At the start of this control procedure, it is assumed that the timer 104, the register 105, and the 4-bit counter 106 are set to the initial value 0.

First, the sequencer acquires the value of the timer 104 (S401), and determines whether or not it is the token packet output time (S402). If it is not the token packet output time, the value of the timer 104 is obtained again (S40).
1). If it is the token packet output time, a token packet is created from the token packet creation circuit 103, an inquiry token packet is output to the line from the data output circuit 108 (S403), and the value of the timer 104 is obtained and identified. Determine whether it is bit output time (S4
05).

If it is not the identification bit output time, the value of the timer 104 is obtained again (S404). If it is the identification bit output time, the identification bit is output by the data output circuit 108 (S406), the slot data is obtained from the line data by the data reading circuit 101 (S407), and the slot data is stored in the table of the register 105. Retained in DNA (S
408) Obtain the counter value of the 4-bit counter 106 (S1
O9), it is determined whether or not the counter value is “1111” (S410).

If the value of the counter is not "1111", one is added to the pointer of the table (S412), and the process proceeds to S404 to acquire the data of the next slot. If the value of the counter is "1111", the value of the timer 104 is obtained (S413), and it is determined whether or not the output time of the token packet for data communication has been reached (S414).

If it is not the token packet output time for data communication, the flow shifts to S413 to acquire the timer value again. If it is the data communication token packet output time, the bit of the transmission request in the table of the register 105 is acquired, and it is determined whether the bit is “1” indicating the transmission request.

When there is no transmission request, the 4-bit counter 10
The counter of 6 is incremented by one (S418), and the transmission request bit of the table is checked again (S415). When there is a transmission request, the value of the register 105 and the value of the 4-bit counter 106 are transferred to the token packet creation circuit 103, and the token packet creation circuit for data communication is created.
103 (S417), instructs the data output circuit 108 to issue a token packet for data communication (S419), and increments the counter of the 4-bit counter 106 by one (S420).
The counter value of the bit counter 106 is obtained (S421).
It is determined whether the counter value of the bit counter 106 is “1111” (S422).

If the value of the counter is not "1111", the value of the timer is obtained to check whether it is the output time of the token packet for data communication (S413). If the value of the counter is “1111”, the value of the timer is obtained to check whether it is the output time of the token packet of the inquiry (S401).

As described above, in the first embodiment of the present invention, the network control device determines the data of the communication request slot in the data read from the line and the number of times the data communication token packet is output to the line. Therefore, a virtual bandwidth management table is realized by combining the value of the 4-bit counter of the sequencer and the value of the register, and the token is created by using the virtual bandwidth management table. By creating a packet and outputting it to the line, network bandwidth management can be realized with a small register capacity.

(Second Embodiment) In a second embodiment of the present invention, when the number of stations connected to the network is larger than the limit number of stations that can be handled by one inquiry, the network is connected to the network. In order to control a network having a master station that outputs inquiry token packets and data communication token packets in group units, communication request data read from the line and data communication token packets The network control device creates a data communication token packet based on data on the number of times of output to the line and data set indicating the number of carry-outs of a counter that counts the number of times the token packet for data communication is output to the line.

FIG. 5 is a diagram showing a basic configuration of a network control device according to the second embodiment of the present invention.
In FIG. 5, a data reading circuit 501 is a circuit of a sequencer in a network control device that converts serial data from a line into parallel data. Control circuit 502
Is a circuit for controlling a sequencer in the network control device. The token packet creation circuit 503 is a sequencer circuit in the network control device that creates a token packet to be output to a line. The timer 504 is a timer of a sequencer in the network control device. The register 505 is a register that is a token management table for data communication of the sequencer in the network control device. The 4-bit counter 506 is a counter that indicates the number of token outputs of the sequencer in the network control device. The ROM 507 stores an RO storing a program indicating a control procedure of the sequencer 102 in the network control device.
M (Read-Only Memory). The data output circuit 508 is
This circuit converts the parallel data of the sequencer in the network control device into serial data and outputs the serial data. The 2-bit counter 509 is a counter that measures the carry-out signal of the sequencer 506 in the network control device.

Data reading circuit 501, control circuit 502, token packet creating circuit 503, timer 504, registers 505, 4
A bit counter 506, a data output circuit 508, and a 2-bit counter 509 constitute a sequencer that outputs an inquiry token and a data transfer token to a line, and a method of outputting an inquiry token and a data transfer token is as follows.
This is realized by a program recorded in the ROM 507.

In this embodiment, the number of stations connected to the network is 64, the number of times that the master station can acquire the contents of the communication request packet slot at a time is 16 stations, and the number of stations connected to the network is 16 Is divided into four sets. Also, as an example, station 1 of group 0 has a transfer request to station 15 of group 2, station 2 of group 0 has a transfer request to station 14 of group 3, and station 1 and group 3 of group 1 The station 16 will be described in the case where there is no transfer request.

FIG. 6 is a diagram showing the flow of a packet on a line. In FIG. 6, a token packet 601 is an inquiry token packet. The content of the packet is serial data “11 1111 11 1111”. Slot 60
Reference numeral 2 denotes a packet slot for a communication request packet, and there are a plurality of slots. The contents of each slot are
The serial data is “1AXXXXXX”, and the first “1” is
A slot identification bit, "A" next to "1" is a bit indicating a transmission request, and when there is a transmission request,
It becomes "1" and becomes "0" when there is no transmission request.
The remaining “XX XXXX” indicates the group number and the station number. Each node has a slot 602 for the assigned communication request packet.
Into the communication request packet. Token packet 603
Is a token packet for data communication. The content of the packet is serial data and indicates "XXXXXXYYYYYY". The first “XXXXXX” indicates the destination set number and station number, and the next “YYYYYY” indicates the source set number and station number. The data packet 604 is a data transmission packet. The content of the packet is serial data, "XXX
... XXXX "are serial data output from the transmitting station.

FIG. 7 is a diagram showing the specifications of the data of the data communication token table recorded in the register 505. In FIG. 7, bits 0 to 3 which are DNA indicate the destination station number, bits 4 to 5 which are DLA indicate the set number of the destination, and bit 6 which is A indicates the transmission request. Indicates that there is.

The operation of the network control device configured as described above will be described below. When the timer 504 determines that it is time to output a token packet, the sequencer uses the data output circuit 508 to set
And outputs an inquiry token packet 601 to the line. Next, when the timer 504 determines that it is time to output an identification signal for identifying the communication request packet slot 602 allocated to each station, the timer 504 outputs an identification signal for identifying the slot 602 to the line.

Each station connected to the line receives the inquiry token packet 601 and determines that it is time to output a transmission request to the master station, and sends an identification signal for identifying the slot 602 for the communication request packet. When the slot is received and determined to be the slot of the own station, data indicating that there is a transmission request, the set number of the transmission destination and the station number are output to the line.

The data reading circuit 501 records the data of the communication request packet slot 602 in the register 505, and records the contents of all the communication request packet slots in the register 505. The register 505 has 16 words with one word being 7 bits. For example, when data is transmitted from the station 1 of the set 0 to the station 15 of the set 2, DNA is “111” as the value of the word 1.
1 ", DLA is set to" 10 ", and A is set to" 1 ". For example, when data is transmitted from station 2 in group 0 to station 14 in group 3, the value of word 2 is: DNA is "11
10 ", DLA is set to" 11 ", and A is" 1 "
Is set to Therefore, the value of the register 505 changes from a value shown in FIG. 7A to a value shown in FIG. 7B.

The master station records all communication request packet slots in the register 505. Next, when the master station determines that the time of the timer 504 has reached the time for outputting the token packet to the line, the master station stores the value of the register 505, the value of the 4-bit counter 506, and the value of the 2-bit counter 509 in the token packet generation circuit. The token packet is created by the token packet creation circuit 503, and the data output circuit 508 outputs the token packet 603 for data communication.

The token packet creation circuit 503 has a 12-bit register, and sets the value of the register 505 other than the MSB to 1
Stores from 1 bit to 6 bits, 2-bit counter 509
Is stored from 5 bits to 4 bits, and the value of the 4-bit counter 506 is stored from 3 bits to 0 bits. The data output circuit 508 outputs the token packet 603 for data communication to the line while converting the data of the token packet creation circuit 503 from parallel to serial.

After the master station outputs the token packet 603 for data communication, each station receives the token packet 603 for data communication, analyzes the token, and then transmits the data. It is determined whether it is time to receive, or time to transmit / receive another station.
For example, when the own station is determined to be the transmitting station, the data packet 60
Outputs 4.

Next, FIG. 8 shows a detailed control procedure for performing data communication while managing the network bandwidth using the token management table in the apparatus shown in FIG. At the start of this control procedure, timer 504, register 5
05, the 4-bit counter 506 and the 2-bit counter 509 are set to the initial value 0.

First, the sequencer acquires the value of the timer 504 (S801), and determines whether or not it is the token packet output time (S802). If it is not the token packet output time, the value of the timer 504 is acquired again (S80
1). If it is the token packet output time, a token packet is created by the token packet creation circuit 503, an inquiry is made to the line from the data output circuit 508, the token packet is output (S803), the value of the timer 504 is obtained, and identification is performed. Judge whether it is the bit output time (S8
05).

If it is not the identification bit output time, the value of the timer 504 is obtained again (S804). If it is the identification bit output time, the identification bit is output by the data output circuit 508 (S806), the data is obtained from the line by the data reading circuit 501 (S807), and the slot data is stored in the DLA, DNA of the table of the register 505. (S809),
Obtain the counter value of the 4-bit counter 506 (S810),
It is determined whether the counter value is “1111” (S81
1).

If the value of the counter is not "1111", one is added to the pointer of the table (S812), and the flow shifts to S804 in order to acquire the data of the next slot. If the value of the counter is "1111", the value of the timer 504 is acquired (S813), and it is determined whether or not it is the output time of the token packet for data communication (S814).

If it is not the token packet output time for data communication, the flow shifts to S813 to acquire the timer value again. If it is the data communication token packet output time, the bit of the transmission request in the table of the register 505 is acquired, and it is determined whether the bit is “1” indicating the transmission request.

When there is no transmission request, the 4-bit counter 50
The counter of 6 is incremented by one (S818), and the transmission request bit of the table is checked again (S815). If there is a transmission request, the value other than the MSB of the register 505, the value of the 4-bit counter 506, and the value of the 2-bit counter 509 are transferred to the token packet generation circuit 503, and the token packet generation circuit 503 performs data communication token packet generation. (S817), and instructs the data output circuit 508 to output a token packet for data communication (S819), increments the counter of the 4-bit counter 506 by one (S820), and obtains the counter value of the 4-bit counter 506. (S821) It is determined whether the counter value of the 4-bit counter 506 is "1111" (S822).

When the counter value of the 4-bit counter 506 is "1"
If it is not 111 ", the value of the timer is obtained to check whether it is the output time of the token packet for data communication (S813). If the counter value of the 4-bit counter 506 is" 111 "
If it is 1 ", the counter of the 2-bit counter 509 is incremented by +1.
(S823), and obtains the value of the timer in order to confirm whether or not it is the output time of the inquiry token packet (S80).
1).

As described above, according to the second embodiment of the present invention, the network control device is configured to read communication request data read from a line, data communication token packet output frequency data to a line, Since the data communication token packet is created based on the set data indicated by the number of carry-outs of the counter that counts the number of times the token packet is output to the line, the value of the 4-bit counter and the value of the 2-bit counter of the sequencer are set. By realizing a number of sets of virtual bandwidth management tables by combining the values of the register and the register, creating a token packet using this virtual bandwidth management table, and outputting the token packet to the line, Network bandwidth management can be achieved by capacity.

The functions of the network control device are as follows: magnetic disk, magneto-optical disk, IC card, PD, DV
The program can be recorded on a recording medium such as a D-ROM, a DVD-RAM, a ROM, and a RAM, and the functions of the network control device can be realized by reading the recording medium by a computer.

[0076]

As described above, according to the present invention, the network control device is provided with data reading means for reading serial data from a line, data output means for outputting transmission data to a line, and a communication request slot in the read data. Data storage means for holding the data of the data communication, a counting means for holding the number of times the data communication token packet is output to the line, and a data communication token packet based on the data in the data storage means and the count value of the counting means. And a token management unit, the bandwidth management table can be realized by reducing the number of storage elements of the data storage unit to less than half of the conventional one, and the number of circuits and power consumption are reduced to less than half, resulting in cost reduction and low power consumption. The effect that power can be obtained is obtained.

Further, a second counting means which indicates a set for counting the number of carry-out occurrences of the first counting means for counting the number of times the data communication token packet is output to the line and outputting the packet, and a data storage means And a token packet creating means for creating a data communication token packet based on the data of the first counting means and the second counting means. A band management table having a set can be realized, the number of circuits and power consumption can be reduced to half or less, and the effect of reducing costs and reducing power consumption can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a network control device according to a first embodiment of the present invention;

FIG. 2 is a diagram showing a flow of a packet on a line according to the first embodiment of the present invention;

FIG. 3 is a diagram of a bandwidth management table of the network control device according to the first embodiment of the present invention;

FIG. 4 is an operation flowchart of the network control device according to the first embodiment of the present invention;

FIG. 5 is a block diagram of a network control device according to a second embodiment of the present invention;

FIG. 6 is a diagram showing a flow of a packet on a line according to the second embodiment of the present invention;

FIG. 7 is a diagram of a bandwidth management table of the network control device according to the second embodiment of the present invention;

FIG. 8 is an operation flowchart of a network control device according to a second embodiment of the present invention;

FIG. 9 is a block diagram of a conventional network control device;

FIG. 10 is a diagram showing the flow of a packet on a conventional line.

FIG. 11 is a diagram of a band management table of a conventional network control device;

FIG. 12 is an operation flowchart of a conventional network control device.

[Explanation of symbols]

 101 data read circuit 102 control circuit 103 token packet creation circuit 104 timer 105 register 106 4-bit counter 107 ROM 1O8 data output circuit 501 data read circuit 502 control circuit 503 token packet creation circuit 504 timer 505 register 506 4-bit counter 507 ROM 508 data Output circuit 509 2-bit counter 901 Data reading circuit 902 Control circuit 903 Token packet creation circuit 904 Timer 905 Register 906 2-bit counter 907 ROM 908 Data output circuit

Claims (6)

[Claims] 1. A data communication token management table, comprising: outputting an inquiry token packet for confirming a network transmission request of a plurality of slave stations; and identifying a communication request packet slot allocated to the plurality of slave stations. After outputting an identification signal for recording the content of the slot for the communication request packet in the token management table for data communication, the token packet for data communication is changed to the value of the token management table for data communication at regular intervals. When transmitting the data of the own station to another station based on the master station that outputs to the line based on the identification signal, and when it is determined that the slot is the own node, it is determined that there is a transmission request. A network consisting of multiple slave stations that output meaning data and destination station number data to the line Data reading means for reading serial data from a line, data output means for outputting transmission data to a line, and data storage means for holding data of a communication request slot in the read data. Counting means for holding the number of times the data communication token packet is output to the line,
A network control device comprising: a token packet creating unit that creates a token packet for data communication based on data in the data storage unit and a count value of the counting unit. 2. A data communication token management table, comprising: outputting an inquiry token packet for confirming a network transmission request of a plurality of slave stations; and identifying a communication request packet slot allocated to the plurality of slave stations. After outputting an identification signal for recording the content of the slot for the communication request packet in the token management table for data communication, the token packet for data communication is changed to the value of the token management table for data communication at regular intervals. If the number of stations connected to the network is larger than the maximum number of stations that can be handled in one inquiry, the stations connected to the network are grouped and the A master station that outputs a token packet for data communication with the When transferring to another station, the identification signal is detected, and when it is determined that the slot is that of the own node, data indicating that a transmission request exists and the number data of the destination station are output to the line. In a network control device for controlling a network composed of a plurality of slave stations, data reading means for reading serial data from a line, data output means for outputting transmission data to a line, and communication during the read data. Data storage means for holding the data of the requested slot, first counting means for holding the number of times a token packet for data communication is output to the line, and counting the number of carry-out occurrences of the first counting means to generate a packet. The second indicating the output pair
And a token packet creating means for creating a data communication token packet based on the data of the data storage means, the first counting means, and the second counting means. Control device. 3. A communication request packet assigned to a plurality of slave stations after a master station having a token management table for data communication outputs an inquiry token packet for confirming a network transmission request of the plurality of slave stations. After outputting an identification signal for identifying the data communication token slot and recording the contents of the communication request packet slot in the data communication token management table, the data communication token packet is stored in the data communication token management every predetermined time. Output to the line based on the value of the table, the plurality of slave stations, when transferring the data of its own station to other stations, when detecting the identification signal, and when it is determined that it is a slot of its own node, Controls the network that outputs to the line data indicating that a transmission request exists and the number data of the destination station Network control method for reading serial data from a line, storing data of a communication request slot in the read data in a storage device, outputting transmission data to the line, and outputting a data communication token packet to the line. A network control method comprising: counting the number of times; and generating a data communication token packet based on the data of a communication request slot and the number of times a data communication token packet is output to a line. 4. A communication request packet assigned to a plurality of slave stations after a master station having a token management table for data communication outputs an inquiry token packet for confirming a network transmission request of the plurality of slave stations. After outputting an identification signal for identifying the data communication token slot and recording the contents of the communication request packet slot in the data communication token management table, the data communication token packet is stored in the data communication token management every predetermined time. Output to the line based on the value in the table, and if the number of stations connected to the network is larger than the limit number of stations that can be handled by one inquiry, divide the stations connected to the network into groups and Output the inquiry token packet and the data communication token packet in the When the number of slave stations transfers the data of the own station to another station, the identification signal is detected, and when it is determined that the slot is a slot of the own node, the data indicates that a transmission request exists. In a network control method for controlling a network for outputting number data of a destination station to a line, serial data from a line is read, data of a communication request slot in the read data is stored in a storage device, and transmission data is transmitted. Is output to the line, counts the number of times the data communication token packet is output to the line, counts the number of carry-outs of the data communication token packet output to the line, and outputs the packet. The number of times the data of the communication request slot in the read data and the token packet for data communication are output to the line and the number of times the carry-out occurs. Network control method characterized by creating a data communication preparative one token packet based on. 5. A communication request packet assigned to a plurality of slave stations after a master station having a token management table for data communication outputs an inquiry token packet for confirming a network transmission request of the plurality of slave stations. After outputting an identification signal for identifying the communication slot, and recording the contents of the communication request packet slot in the data communication token management table, the data communication token packet is transmitted at regular time intervals to the data communication token management table. When the slave station transfers its own data to another station, it detects the identification signal, and determines that it is the slot of its own node. A program that controls the network that outputs data indicating that a request exists and the number data of the destination station to the line. In the recording medium on which the communication request packet slot is stored, the number of data communication token packet output to the line is counted, and the communication request packet slot data and the data communication token packet are stored. A network control program recording medium, wherein a network control program for generating a token packet based on the number of times of output to a line and outputting transmission data to the line is recorded. 6. A communication request packet assigned to a plurality of slave stations after a master station having a token management table for data communication outputs an inquiry token packet for confirming a network transmission request of the plurality of slave stations. After outputting an identification signal for identifying the communication slot, and recording the contents of the communication request packet slot in the data communication token management table, the data communication token packet is transmitted at regular time intervals to the data communication token management table. If the number of stations connected to the network is greater than the limit number of stations that can be handled by one inquiry, the stations connected to the network are grouped, and Outputting the inquiry token packet and the data communication token packet, When the slave station transfers its own data to another station, the slave station detects the identification signal and, when it is determined that the slot is a slot of its own node, the data indicating that a transmission request exists and the transmission destination. In a recording medium storing a program for controlling a network for outputting the number data of the station to the line, the data of the slot for the communication request packet is stored, and the number of times of outputting the token packet for data communication to the line is counted. Was output to the line, the number of carry-out occurrences indicating that the number of times the data communication token packet was output to the line was completed, and the data of the communication request slot and the data communication token packet were output to the line. A network control program for creating a token packet based on the number of times and the number of carry-out occurrences is recorded. Network control program recording medium characterized and.