JPH057190A - Line adaptor - Google Patents

Abstract

PURPOSE:To reduce the hardware and number of interface lines to a serial input output device. CONSTITUTION:A transmission reception serial data multiplexer demultiplexer controller 10 receives a reception serial data via a line driver/receiver 11 from a communication line, demultiplexes the data in the unit of channels and outputs a transmission reception frame enable signal 8 to be fetched in serial input output devices 1-5 and receives a transmission serial data outputted from a storage device 9 and outputs the data to a communication line synchronously with the reception serial data. A write read control section 14 uses the transmission reception frame enable signal 8 to write each channel in a transmission serial data 6 outputted from each serial input output device to the storage device 9 synchronously with a reception clock and the reception frame synchronizing signal of the received serial data sequentially from a predetermined address. In parallel each channel of a transmission serial data written from the storage device 9 is read sequentially in a delayed form by a predetermined time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line adapter device for controlling transmission / reception of serial data multiplexed between a serial input / output device and a communication line.

[0002]

2. Description of the Related Art In the conventional line adapter device, for multiplexing transmission serial data and separating reception serial data, a transmission serial data multiplexing control device is provided on the transmission side and a reception serial data separation control device is provided on the reception side. Control signals such as a transmission side frame enable signal and a reception side frame enable signal are separately created for the serial input / output device of each channel, and the transmission side and the reception side are separately controlled.

[0003]

Multiplexing of transmission serial data in the above-mentioned conventional line adapter device, and
Separation of the received serial data was controlled separately on the transmission side and the reception side, so the amount of hardware increased, and
Since the interface signal line for the serial input / output device of each channel exists separately on the transmitting side and the receiving side, the number of signal lines increases. Further, in recent years, the number of channels that can be accommodated in one frame of a transmission frame tends to increase as the line speed becomes higher. However, as the number of channels increases, the number of bits of the transmission side frame enable signal and the reception side frame enable signal increases. The number of lines increases, and the interface signal line becomes complicated.

An object of the present invention is to solve the above-mentioned drawbacks and to share a transmission serial data multiplexing control device and a reception serial data demultiplexing control device as a transmission / reception serial data demultiplexing control device, thereby reducing the hardware amount. It is to reduce and simplify the interface.

[0005]

A first aspect of the present invention is a line adapter device for controlling transmission and reception of serial data multiplexed between a serial input / output device to which a plurality of prediction channels are assigned and a communication line. A transmission / reception in which received serial data is received from the communication line via a line driver / receiver, the received serial data is separated into channel units, and the channel unit data is sequentially fetched into the serial input / output device corresponding to the channel. Transmission and reception of outputting a frame enable signal and receiving second transmission serial data output from a storage device provided in advance and outputting the same to the reception serial data to the communication line via the line driver / receiver A serial data demultiplexing control device and the transmission / reception frame enable signal. In the storage device, each channel data in the first transmission serial data output from the serial input / output device of each channel indicated by is synchronized with the reception clock and the reception frame synchronization signal extracted from the reception serial data. A predetermined time for writing each channel data of the first transmission serial data written in synchronization with the reception clock and the reception frame synchronization signal from the storage device in order from a predetermined address. And a writing / reading control unit that sequentially reads out the data and outputs it as the second transmission serial data.

[0006]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

As shown in FIG. 1, the line adapter device of this embodiment has serial input / output devices 1 to 5 for each channel, transmission serial data 6, reception serial data 7, transmission / reception frame enable signal 8, storage device 9, From the transmission / reception serial data demultiplexing control device 10, the line driver / receiver 11 that performs level conversion of the electrical characteristics of the transmission / reception serial data, the reception clock 12 extracted from the communication line reception data, the reception frame synchronization signal 13, and the write / read control unit 14. Composed.

FIG. 2 shows a transmission frame structure on a communication line in which transmission / reception serial data of a plurality of channels are multiplexed. The transmission frame is composed of 24 channels, each channel consisting of 8 bits, and 1 bit (F bit).

FIG. 3 shows the correspondence between the bit position in the transmission serial data 6 in the transmission frame structure, the output data 3-1 of the storage device 9 and the bit position in the reception serial data 7. The transmission serial data 6 and the reception serial data 7 are synchronized with the reception clock 12 extracted from the communication line reception data, and have 1-bit data for one clock cycle.

The reception serial data 7 is separated into each channel by the transmission / reception serial data demultiplexing control device 10 via the communication line and the line driver / receiver 11, and the reception / transmission serial data demultiplexing control device 10 uses the reception serial data 7 as a basis. It is input to the serial input / output devices 1 to 5 of each channel by the transmission / reception frame enable signal 8 created in the above.

The transmission serial data 6 is output by the serial input / output devices 1 to 5 of each channel indicated by the transmission / reception frame enable signal 8 and written in the storage device 9.

Writing the transmission data to the storage device 9
The write / read controller 14 controls the reception clock 12,
It is performed in synchronization with the reception frame synchronization signal 13 and is written in order from the predetermined address to the channel 1 to the channel 24 of the transmission serial data 6, and when the predetermined number of frames are written, the original address is written. Controlled to return to.

Similarly, the reading of the received data from the storage device 9 is performed by the write / read controller 14 in synchronization with the received clock 12 and the received frame synchronization signal 13, and the written channel data is output as the output data 3-1. As shown in the figure, the write data is delayed by a predetermined time.

Writing / reading control in the storage device 9 is performed by the serial input / output device 1 of the transmission serial data 6.
Since the outputs from 5 to 5 are performed in synchronization with the reception clock 12 and the reception frame synchronization signal 13, the transmission / reception serial data demultiplexing control device 10 delays the transmission data with respect to the reception data, so that the synchronization processing cannot be performed. This is performed in order to delay the transmission serial data 6 by one frame and synchronize it with the reception serial data 7.

By the above operation, the transmission serial data 6
And the reception serial data 7 are synchronized with each other, the transmission / reception frame enable signal 8 and the transmission / reception serial data demultiplexing control device 10 can be shared between the transmission side and the reception side. The number of interfaces between the transmission / reception serial data demultiplexing control device 10 can be reduced.

[0017]

As described above, in the line adapter device of the present invention, the transmission serial data and the reception serial data are synchronized, and the transmission / reception frame enable signal and the transmission / reception serial data demultiplexing control device are provided on the transmission side and the reception side. Since it can be shared by both, there is an effect that the amount of hardware can be reduced and the number of interface lines for the serial input / output device can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a line adapter device of the present invention.

FIG. 2 is a diagram showing a transmission frame configuration on a communication line of the present embodiment.

FIG. 3 is an operation explanatory diagram of the present embodiment.

[Explanation of symbols]

 1 serial input / output device 2 serial input / output device 3 serial input / output device 3-1 output data of storage device 9 serial input / output device 5 serial input / output device 6 transmission serial data 7 reception serial data 8 transmission / reception frame enable signal 9 storage device 10 Transmit / Receive Serial Data Multiplexing / Demultiplexing Control Device 11 Line Driver / Receiver 12 Receive Clock 13 Receive Frame Synchronization Signal 14 Write / Read Controller

Claims (1)

Claim: What is claimed is: 1. A line adapter device for controlling transmission / reception of serial data multiplexed between a serial input / output device to which a plurality of prediction channels are allocated and a communication line, wherein the communication line A receive / transmit frame enable signal for receiving received serial data via a line driver / receiver, separating the received serial data into channels, and sequentially fetching the data in units of the channels into the serial input / output device corresponding to the channels. Transmit / receive serial data demultiplexing for outputting and receiving second transmit serial data output from a storage device provided in advance and synchronizing with the receive serial data and outputting to the communication line via the line driver / receiver Indicated by the control device and the transmit / receive frame enable signal Each channel data in the first transmission serial data output from the serial input / output device of each channel is predicted in the storage device in synchronization with the reception clock and the reception frame synchronization signal extracted from the reception serial data. Writing in order from a predetermined address and delaying each channel data of the written first transmission serial data from the storage device in synchronization with the reception clock and the reception frame synchronization signal by a predetermined time. And a writing / reading control unit that sequentially reads the output data and outputs it as the second transmission serial data.