JPS6285529A - Transmission and reception equipment for ring-shaped local area network node - Google Patents

Abstract

PURPOSE:To shorten the latent delay time within a node and to ensure the effective use of a receiving buffer memory, by using a serial/parallel converting circuit for receiving frame, a parallel/serial converting circuit for transmission data, a frame discrimination/transfer control part and a reproduction/ transmission control part to form a transmission/reception equipment. CONSTITUTION:The data frame sent from a ring-shaped local area network node (not shown in figure) is received by a receiver RV and sent to a converting circuit URT. Then the received serial data are converted into the parallel data and added to a frame discrimination/transfer control part FRCK for each byte. Here the normalness of the frame is confirmed together with the address node address and the transmission node address and then transferred to a reception data buffer memory RB0 or RB1 if they are correct. At the same time, a reproduction/transmission control part REPCTL and latch circuits L0-L4 are actuated to transmit the signals with sequential shift to a driver DR via a microcontrol part MCU, a transmission data switching part SEL and the circuit URT.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmitting/receiving device for a communication processing node, and particularly to a transmitting/receiving device for a ring type local area network node.

[Conventional technology]

Conventionally, this type of transmitter/receiver apparatus stores a received frame in a receive buffer within its own node, identifies the address of the frame, and when it is necessary to reproduce and transmit the frame, retrieves the frame from the buffer and transmits it.

[Problem that the invention seeks to solve]

The above-mentioned conventional ring-type local area network node transmitter/receiver identifies the address of the frame after storing the received frame in the receive buffer within its own node, so there is a large delay within the node when reproducing and transmitting it. Furthermore, even if the destination node address does not match the own node address, the receiving buffer of the own node is temporarily occupied, so there is a drawback that the receiving buffer cannot be used efficiently.

[Means for solving problems]

The transmitting/receiving device of the ring type local area network node of the present invention converts an input received frame from serial data to parallel data in units of bytes and outputs the same, and converts the transmitted data to be sent from parallel data to serial data. Confirms the output conversion circuit, the destination node address and the source node address of the received frame, and stores the received data in the received data buffer memory only if the destination node address is equal to its own node address or is a global address. a frame identification transfer control unit that controls the frame identification transfer control unit, a multi-stage latch circuit that sequentially shifts the parallel data input from the conversion circuit in byte units, and a multi-stage latch circuit that sequentially shifts the parallel data in byte units by controlling the latch circuit. If the signal output by the frame identification transfer control unit indicates that the originating node address and the own node address are different, the signal is reproduced as is, and when the originating node address and the own node address are equal, the reproduction transmission is stopped. It is characterized by having a reproduction and transmission control section for controlling.

In this way, the destination address and originating address in the received frame are first identified, and only when the destination address is the own node address or the global address, it is scattered into the receive buffer memory, and otherwise it is reproduced and transmitted. The delay time when the originating address resides in its own node is shortened, and the receive data buffer memory can be used effectively.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram showing an embodiment of a transmitting/receiving device for a ring type local area network node according to the present invention, and FIG.
The figure is a diagram showing a frame format of data transmitted and received in the example of FIG. 1.

Frames to be sent and received start from the beginning with delimiter SD, frame control FC, and destination node address DA.

Source node address SA, information section I, end delimiter ED
, frame status FS.

The receiver RV is a ring local area network (
(not shown) and converts the data frame to the conversion circuit URT.
input. The conversion circuit URT converts the received serial data into 8-bit parallel data, and also converts the parallel data input from the transmission data switching unit SEL into serial data and sends it to the driver DR. Frame identification transfer control unit F
RCK checks the normality and address of the received frame output from the conversion circuit URT, and if the destination node address DA is equal to the own node address or is a global address, the reception buffer control unit RBCTL
It instructs the node to receive the received data, and notifies the reproduction and transmission control unit REPCTL of a signal indicating whether the originating node address SA of the received frame is equal to or different from its own node address.

The reception buffer control unit RBCTL stores reception data in reception data buffer memories RBo and RBIK when necessary under the control of the frame identification transfer control unit FRCK, and also
A reception buffer memory RBQ is controlled by the microcontroller MCU.

Data is taken out from the RBI and output to a processor 9 (not shown) or the like.

The reproduction transmission control unit REPCTL transfers each frame lk!
u When the signal from the control unit FRCK indicates that the originating node address and the own node address are different, the latch circuit is activated. -1 to sequentially shift the received data in byte units as reproduction transmission data. Transmission buffer control section T
Is BCT L a micro system? Under the control of the KI section MCU, the outgoing data output from the processor etc. is stored in the transmission data buffer memory TXB or taken out from it. The transmission data switching unit SEL switches either the reproduced transmission data outputted from the latch circuit L4 or the self-node transmission data outputted from the transmission buffer control unit TBCTL to the conversion circuit URT under the control of the microcontroller MCU. Send. Driver DR is conversion circuit UR
T also sends out the input reproduction transmission data or self-node transmission data to the network. Micro control unit MCU
are the reception buffer control unit RBCTL and the reproduction transmission control unit RE.
It controls the input/output switching gate OG between the PCTL, the transmission buffer control unit TBCTL, the transmission data switching unit SEL, and the processor.

Next, the operation of this embodiment will be explained using the drawings.

The serial data received by the restorer RV is converted into 8-bit parallel data by the depth conversion circuit URT, and the frame identification transfer control unit FRCK checks the normality of the frame, the destination node address DA, and the source node address S for each byte.
A is checked, and only if the destination node address DA is equal to the own node address or is a global address, the received data is transferred to the reception buffer control unit RBC.
Receive data buffer memory RBQ or R via TL
Transfer to BI. At the same time, the reproduction and transmission control unit REPCTL
, and in the latch circuits L0 to L4, parallel data is stored in the 8-bit latch circuit L0 for each byte,
The previous data of the latch circuit L0 is sent to the latch circuit LX', the previous data of the latch circuit is sent to the latch circuit, the previous data of the latch circuit is sent to the latch circuit, and the previous data of the latch circuit is sent to the latch circuit.
The previous data is sent to the latch circuit L4, respectively on the reproduction and transmission side.
The signals are shifted sequentially under the control of the control unit REPCTL. Further, according to instructions from the frame identification transfer control unit FRCK and the microcontroller MCU, the regeneration and transmission control unit REPCTL uses a latch circuit to set the start delimiter SD, which is the first byte of the frame, when the source node address SA of the frame is different from its own node address. When the frame is stored, playback and transmission of the frame starts. In addition, if the originating node address SA is equal to the own node address, the reproduction transmission control unit REPC
TL executes control without reproducing and transmitting. Switching between playback transmission and self-node origination transmission is performed by the microcontroller MCU.
This is performed by the transmission data switching unit 5ELK under the control of the transmission data switching unit 5ELK, and the transmission data is converted from parallel data to serial data by the conversion circuit URT and transmitted by the driver DR.

〔Effect of the invention〕

As explained above, the present invention includes a conversion circuit that performs serial/parallel conversion of received frames and diagonal sequence conversion of transmitted data;
A frame identification transfer control unit that identifies the control field and address field and stores the received data in the received data buffer memory only when necessary, and a multi-stage latch circuit that sequentially shifts serial/parallel converted data in byte units. It has a regeneration and transmission control unit that regenerates and transmits when necessary, and the frame identification transfer control unit and regeneration and transmission control unit operate at the same time, which shortens the latent delay time within the node and makes efficient use of the reception buffer memory. There is an effect that can be done.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of a transmitting/receiving device for a ring type local area network node according to the present invention, and FIG.
FIG. 3 is a diagram illustrating a frame format of a frame used in the illustrated example; RV,・・・・・・・・・・Renva, DR・・・・
...Driver, URT... Conversion circuit, L
0~L4...Latch circuit, REPCTL...
Reproduction transmission control unit, FRCK...Frame identification transfer control unit MCU...Micro control unit, RBCT...
Reception buffer control unit, TBCTL...Transmission buffer control unit, RBO, RBI...Reception data buffer memory TXB......Transmission data buffer memory SE... .........Transmission data switching unit, SD......Start delimiter, FC......Frame control DA...
...Destination node address, SA ...Source node address I ...Information department, ED
...End delimiter FS...Frame status, JOG...Input/output gate.

Claims (1)

[Claims] The frame is accepted only when the destination node address of the received frame is equal to the own node address or is a global address, and when the originating node address of the received frame is equal to the own node address. The transmitter/receiver of the ring-type local area network node only stops reproducing and transmitting the frame, converts the received received frame from serial data to byte-by-byte parallel data and outputs it, and converts the transmitted data to be sent from the parallel data. A conversion circuit that converts into serial data and outputs it, and checks the destination node address and source node address of the received frame, and receives the received data only if the destination node address is equal to its own node address or is a global address. A frame identification transfer control unit that controls the storage of the received frame in the data buffer memory and outputs a signal indicating whether the originating node address of the received frame is equal to or different from the own node address; A multi-stage latch circuit that sequentially shifts the data, and a latch circuit that controls the latch circuit to sequentially shift parallel data in units of bytes to detect that the signal output from the frame identification transfer control section has a different originating node address and own node address. If indicated,
1. A transmitting/receiving device for a ring-type local area network node, comprising a reproduction transmission control unit configured to perform reproduction transmission as is and to stop reproduction transmission when a source node address and its own node address are equal.