JPH04287456A - Transmission controller - Google Patents

Abstract

PURPOSE:To improve the processing efficiency by storing a transmission data of a terminal equipment to an FIFO memory and reading a data by number of transmission start data from the memory and sending it. CONSTITUTION:A terminal equipment 1 outputs a user data together with a transmission start data and a terminal interface section 4 writes the transmission data to a transmission FIFO memory 5. When a data is written in the transmission FIFO memory 5, a data valid signal 9 is made significant and a transmission control section 8 is started by a significant data valid signal 9. The transmission control section 8 confirms it that no transmission is implemented at present and the transmission FIFO memory 5 outputs the transmission start data and an address of a transmission section 17 storing the transmission start data is outputted simultaneously and a write control signal 11 is outputted, A transmission section 17 reads a data of a number designated by the transmission start data and sends it to a transmission line 18.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission control device that controls the transmission of data held by a terminal device onto a transmission path.

0002

2. Description of the Related Art FIG. 6 is a block diagram showing a conventional transmission control device. In the figure, 1 is a terminal device, 31 is a terminal interface unit that controls data transfer between the terminal device 1 and the transmission memory 32 and reception memory 33, 18 is a transmission path, and 34 is a terminal that sends data to the transmission path 18 and This is a transmission unit that receives data from the transmission path 18. Further, 35 indicates a transfer activation signal, and 36 indicates a data reception signal.

Next, the operation will be explained. When the terminal device 1 has data to be transmitted, it passes the data to the terminal interface section 31. The terminal interface section 31 is
After writing the received data to the transmission memory 32,
A transfer activation signal 35 is issued to the transmission unit 17 to request activation of transmission. Then, the transmission unit 17 reads the contents of the transmission memory 32 and sends it to the transmission path 18.

On the other hand, the transmission section 34 writes the data received from the transmission line 18 into the reception memory 33. Then, the data reception signal 36 is given to the terminal interface section 31. The terminal interface unit 31 learns of the reception of data,
Data is read from the reception memory 33 and given to the terminal device 1.

[0005]

[Problem to be Solved by the Invention] Since the conventional transmission control device is configured as described above, when the number of terminal devices 1 increases and data transmission requests are generated simultaneously from a plurality of terminal devices 1, There is a problem in that other transmission requests are not accepted until the data of the terminal device 1 on which the transmission request was accepted first has been sent to the transmission path 18, and the processing efficiency of the terminal device 1 is reduced. In addition, the transmission memory 32
After the data is written to, there is a problem in that the transmission efficiency decreases because processing for starting transmission is required.

[0006] This invention was made to solve the above-mentioned problems, and when data transmission requests are generated from a plurality of terminal devices, the waiting time until the request is accepted is reduced, thereby improving processing efficiency. The purpose of the present invention is to obtain a transmission control device that can improve the performance.

[0007]

[Means for Solving the Problems] A transmission control device according to the present invention includes a transmission FIFO memory that temporarily stores transmission data outputted by a terminal device, and a transmission FIFO memory that stores transmission data output from a terminal device. A transmission control section that outputs transmission activation data and a write control signal, and a transmission FIFO that outputs a write control signal as well as transmission start data;
F
It is equipped with a transmission unit that reads data from the IFO memory and sends the read data to a transmission path.

[0008]

[Operation] The transmission control section in this invention has a transmission FIFO
When data is written into the memory, transmission activation data in the data is given to the transmission unit, and the transmission unit reads a predetermined number of data from the transmission FIFO memory.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 to 3 are terminal devices, 4 is a terminal interface section, 5 is a transmission FIFO memory in which transmission data is temporarily stored, and 6 is a busy signal output from the transmission FIFO memory. Further, 8 is a transmission control unit that activates the transmission unit 17, and 9 is a transmission F
A data valid signal outputted from the IFO memory 5, 10 a chip select signal given to the transmission FIFO memory 5, 11 a write control signal given to the transmission section 17, 1
2 indicates a response signal output from the transmission section 17.

[0010] 7 is a receiving FI in which received data is temporarily stored.
FO memory, 13 is a reception control unit that activates reception on the terminal interface unit 4, 14 is a data valid signal output from the reception FIFO memory 7, 15 is a reception interrupt signal given to the terminal interface unit 4, and 16 is a reception control unit. A busy signal output from the FIFO memory 7 is shown. Further, 17 is a transmission unit that sends data read from the transmission FIFO memory 5 to the transmission line 18 and writes data received from the transmission line 18 to the reception FIFO memory 7.

FIG. 2 is a block diagram showing the configuration of the transmission control section 8. As shown in FIG. In the figure, 21 is a FIFO read control section that is activated by a data valid signal, 22 is a transmission section write control section that is activated by a transmission section access activation signal 19 outputted by the FIFO read control section 21, and generates a write control signal 11; is an address generation section that is activated by the transmission section access activation signal 19 and generates an address 20.

Next, the operation will be explained. First, a case where the terminal device 1 transmits data will be described. The terminal device 1 outputs user data to the terminal interface unit 4 along with transmission activation data (data length and data attributes). The terminal interface unit 4 has a transmission FIFO memory 5
Write those transmission data to. When data is written into the transmission FIFO memory 5, the data valid signal 9 becomes significant, so the transmission control unit 8 is activated by the data valid signal 9 which becomes significant.

The transmission control section 5 operates as shown in the flowchart of FIG. 3 and the timing diagram of FIG. 4. That is, when activated by the significant data valid signal 9 (step ST1), it is confirmed by the response signal 12 of the transmitter 17 that transmission is not currently in progress (step ST2). If transmission is in progress, wait until the transmission is completed. If the transmission is not in progress, the FIFO read control unit 21 outputs the chip select signal 1.
0 (see FIG. 4(b)), and transmits FIFO memory 5.
The transmission start data is outputted from (step ST3). At the same time, a transmission unit access activation signal 19 is generated. The address generation unit 2 responds to the transmission unit access activation signal 19.
3 outputs the address 20 of the transmission section 17 where the transmission activation data is stored, and the transmission section write control section 22 outputs the write control signal 11 (step ST4).

[0014] In this way, the transmission unit 17 to which the transmission activation data has been given reads the data for the number of data designated by the transmission activation data, that is, the user data, and sends it to the transmission path 18 (step ST5). ). Note that when the transmission data output from the terminal device 1 is stored in the transmission FIFO memory 5, unless the busy signal 6 is significant,
The transmission requests from the other terminal devices 2 and 3 are immediately accepted by the terminal interface unit 4.

Next, the operation when receiving data will be explained. When the transmission unit 17 receives data from the transmission path 18,
The received data is written into the reception FIFO memory 7. Then, since the data valid signal 14 becomes significant, the reception control unit 13 activated by the significant data valid signal 14
outputs a reception interrupt signal 15 to the terminal interface unit 4. When receiving the reception interrupt signal 15, the terminal interface unit 4 reads the reception data from the reception FIFO memory 7 and outputs it to the corresponding terminal device 1, 2, 3.

[0016] Furthermore, since the reception memory is FIFO,
Furthermore, when data is received from the transmission line 18, it can be written into the reception FIFO memory 7. Furthermore, when the reception FIFO memory 7 becomes full of data, the busy signal 16 becomes significant, and the transmission section 17 is prohibited from writing to the reception FIFO memory while the busy signal 16 is significant.

Further, although the format shown in FIG. 5 is used as the format of the transmission data, other formats may be used.

[0018]

As described above, according to the present invention, the transmission control device transmits the transmission data output from the terminal device to the transmission FIF.
Since the configuration is configured so that the number of data indicated by the transmission activation data included in the transmission data stored in the O memory and read from the transmission FIFO memory is read from the transmission FIFO memory and sent to the transmission path, the terminal device The advantage is that the processing from receiving the transmission data output from the terminal to transmitting it to the transmission path is made more efficient, and the processing capacity of the terminal device can be improved by immediately accepting transmission requests from the terminal device. It has the effect of

[Brief explanation of the drawing]

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

FIG. 2 is a block diagram showing the configuration of a transmission control section.

FIG. 3 is a flowchart showing the operation of a transmission control section.

FIG. 4 is a timing diagram showing an example of the timing of input/output signals of a transmission control unit.

FIG. 5 is an explanatory diagram showing an example of the format of transmission data.

FIG. 6 is a block diagram showing a conventional transmission control device.

[Explanation of symbols]

4 Terminal interface section 5 Transmission FIFO memory 7 Receive FIFO memory 8 Transmission control section 13 Reception control section 17 Transmission section 21 FIFO read control section 22 Transmission unit light control unit 23 Address generation section

Claims (1)

[Claims] 1. A transmission control device that is provided between a terminal device and a transmission path and controls transmission and reception between the terminal device and the transmission path, the transmission control device temporarily storing transmission data output by the terminal device. Transmission FIFO memory and this transmission F
a transmission control unit that outputs transmission activation data in the data when data is written to the IFO memory and also outputs a write control signal; and a transmission control unit that outputs transmission activation data included in the data and outputs a write control signal; A transmission control device comprising: a transmission unit that reads data from the transmission FIFO memory according to data count information contained therein, and transmits the read data to the transmission path.