KR100294642B1 - Bidirectional Synchronous Communication Transceiver Using Manchester Coding Technique - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a two-way synchronous communication transmission and reception apparatus using the Manchester coding technique.

2. The technical problem to be solved by the invention

The present invention provides a Manchester coding scheme in which a transmitting end simultaneously transmits data information and clock information, and a receiving end recovers data information and clock information from a received signal to simultaneously perform bidirectional synchronous communication. To provide a bidirectional synchronous communication transmission and reception apparatus using.

3. Summary of the Solution of the Invention

The present invention includes: first shifting means for outputting shifted serial data; Manchester coding means for outputting by Manchester coding; Start / stop bit generation and shifting control means for transmitting serial data after generating a start bit, and generating and transmitting a stop bit after transmission; And selection means for selecting and outputting one of the signals input from the Manchester coding means and the start / stop bit generation and shifting control means according to a mode selection signal input from the outside.

4. Important uses of the invention

The present invention is used for synchronous communication of the Intel 80186EC.

Description

Bidirectional Synchronous Communication Transceiver Using Manchester Coding Technique

The present invention relates to an apparatus for transmitting and receiving bidirectional synchronous communication using a Manchester coding scheme for providing bidirectional synchronous communication to the Intel 80186EC.

The conventional 80186EC (80186 Electronic Calculators) performs synchronous transmission using mode 0 of a serial communication unit (SCU).

In addition, the synchronous transmission is used for communication with an external device and multi-processor communication. The conventional Serial Communication Unit (SCU) of the 80186EC has a TXD pin and a receiving device (RX) of a transmission machine (TX machine). machine: Provides synchronous transmission using the RXD pin of a receive machine.

The synchronous method transfers data and clock together. When the clock changes, data values can be read together, so data is transmitted efficiently without giving a start bit for each byte.

However, in order to perform the synchronous transmission, a pin for transmitting a clock signal and a pin for transmitting data are required.

The Intel 80186EC uses the TXD pin to send clock signals and the RXD pin to send and receive data.

1 is a diagram illustrating a transmission clock and transmission data and a reception clock and reception data in a conventional Intel 80186EC.

As shown in the figure, (a) represents a clock signal transmitted through the TXD pin of the transmitting side, (b) represents a data signal transmitted through the RXD pin of the transmitting side, and (c) represents the receiving side of the receiving side. A clock signal received through the TXD pin is shown, and (d) shows a data signal received through the RXD pin.

As shown in the figure, the transmitting side loads data b using a negative transition (1 → 0) of the clock signal a, and the receiving side positively shifts the clock signal c. Data (d) is recovered using transition (0 → 1)).

The conventional method only supports unidirectional transmission.

However, the conventional 80186EC uses the RXD pin as a channel for data transmission and the TXD pin as a channel for clock transmission, which makes it possible to transmit or receive only at one point in time and not to perform bidirectional synchronous communication at the same time. there was.

In addition, such unidirectional transmission degrades data transmission by supporting only transmission or reception at a time, and puts a burden on the operator to consider synchronization.

Therefore, in order to solve the above problems, the present invention uses a Manchester coding scheme to simultaneously transmit data information and clock information at the transmitting end, and recover the data information and clock information from the received signal at the receiving end. It is an object of the present invention to provide a two-way synchronous communication transmission and reception apparatus using a Manchester coding technique to enable two-way synchronous communication at the same time.

1 is a diagram illustrating a transmission clock and transmission data and a reception clock and reception data in a conventional Intel 80186EC.

2 is an explanatory diagram of a Manchester coding technique used in the present invention.

3 is a block diagram showing a bidirectional synchronous communication transmission apparatus according to an embodiment of the present invention.

4 is a block diagram showing a bidirectional synchronous communication receiving apparatus according to an embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

301, 406: Register 302: Parity Generator

303: parity controller 304, 405: shift register

305: Manchester encoder

306: Start / Stop bit generation and shift controller

307, 403, 404: Multiplexer 308: Shifter

401: Manchester Decoder 402: Sampler

In order to achieve the above object, the transmitting apparatus of the present invention generates and adds a parity bit according to a parity enable signal and an even enable signal inputted from the outside and transmits the byte to be transmitted from the outside to the shift clock input from the outside. First shifting means for outputting serial data shifted along; Manchester coding means for outputting Manchester coded serial data received from the first shifting means according to a board clock input from the outside; A start / stop bit generation and shifting control means for transmitting the serial data received from the first shifting means after generating a start bit according to a board clock input from the outside, and generating and transmitting a stop bit after transmission; And selection means for selecting and outputting one of the signals input from the Manchester coding means and the start / stop bit generation and shifting control means according to a mode selection signal input from the outside.

In addition, the receiving apparatus of the present invention, Manchester decoding means for recovering the data and the shift clock from the Manchester coded signal received from the outside; Sampling means for receiving a signal consisting of a start bit, a data to be transmitted, and a stop bit from an external device according to a board clock input from the outside to restore and output the data and the shift clock; And first shifting means for outputting parallel data obtained by shifting a signal received from the Manchester decoding means and the sampling means according to a shift clock.

In addition, the transmission and reception apparatus of the present invention generates and adds a parity bit according to a parity enable signal and a good enable signal input from the outside, and shifts the serial byte shifted according to a shift clock input from the outside. First shifting means for outputting a; Manchester coding means for outputting Manchester coded serial data received from the first shifting means according to a board clock input from the outside; A start / stop bit generation and shifting control means for transmitting the serial data received from the first shifting means after generating a start bit according to a board clock input from the outside, and generating and transmitting a stop bit after transmission; First selection means for selecting and outputting one of the signals input from the Manchester coding means and the start / stop bit generation and shifting control means according to a mode selection signal input from an external device; Manchester decoding means for restoring and outputting the data and the shift clock from the Manchester coded signal received by the first selection means; Sampling means for receiving a signal consisting of a start bit, a data to be transmitted, and a stop bit from the first selection means, restoring the data and the shift clock according to a board clock input from the outside; And second shifting means for outputting parallel data obtained by shifting a signal received from the Manchester decoding means and the sampling means according to a shift clock.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 2 to 4.

2 is an explanatory diagram of a Manchester coding technique used in the present invention.

As shown in the figure, (a) denotes a bit string to be transmitted, (b) denotes a Manchester coded signal, (c) denotes a clock reproduced on the receiving side, and (d) denotes data reproduced on a clock. Indicates.

The Manchester coding technique is a method of converting data from 1 to 01 and 0 to 10.

When the transmitter transmits data using the Manchester coding scheme, the receiver reads the data a little later based on the transition point of 1 → 0 or 0 → 1, and recovers the data, and then transitions to 1 → 0 or 0 → 1. The clock is recovered by recognizing the transition point as the clock transition point.

As shown in the figure, the bit string a to be transmitted is 10011101, the signal b obtained by Manchester coding the bit string a to be transmitted is 0110100101011001, and the clock c reproduced on the receiving side is a Manchester coded signal ( The transition point of b) is recognized as the transition point of the clock and obtained. The data d is recovered using the reproduced clock.

By using the Manchester coding scheme, it is possible to communicate in a synchronous manner using only a data transmission channel without using a separate clock.

In addition, this method can use the TXD pin for data transmission and the RXD pin for reception by using only the data transmission channel.

Therefore, synchronized bidirectional transmission is possible.

3 is a block diagram showing a bidirectional synchronous communication transmission apparatus according to an embodiment of the present invention.

As shown in the figure, the bidirectional synchronous communication transmission apparatus includes a register 301, a parity generator 302, a parity controller 303, a shift register 304, a Manchester encoder 305, a start / A stop bit generation and shift controller 306, a multiplexer 307 and a shifter 308 are provided.

The register 301 stores bytes to be transmitted from the outside, and outputs data stored in the shift register 304 and the parity generator 302.

The parity generator 302 generates parity according to the data information input from the register 301 and outputs the parity to the parity controller 303.

The parity controller 303 outputs the input parity to the shifter 308 as the enable signal is input from the outside, and also outputs the even parity to the shifter 308 according to the even enable signal input from the outside.

The shifter 306 shifts a predetermined bit to the left or right of the parity input from the parity controller 303 and outputs the predetermined bit to the shift register 304.

The shifter register 304 adds parity input from the shifter 308 to the transfer byte input from the register and then shifts the data left or right in series with the Manchester encoder 305 and start / stop bit generation and shift controller 306. )

The Manchester encoder 305 performs a multiplexer 307 after performing Manchester coding on a signal input from the shift register 304 to convert 1 into 10 and 0 into 01 according to a baud clock input from the outside. )

The start / stop bit generation and shift controller 306 generates and outputs a bit indicating start according to a board clock input from the outside to transmit a signal input from the shift register 304, and then stops after transmitting data. Generates a bit to inform the output to the multiplexer 307.

The multiplexer 307 selects an input signal according to a mode selection signal input from the outside and outputs the selected signal to the outside.

4 is a block diagram showing an apparatus for receiving bidirectional synchronous communication according to an embodiment of the present invention.

As shown in the figure, the synchronous communication receiving apparatus includes a Manchester decoder 401, a sampler 402, a first multiplexer 403, a second multiplexer 404, and a shifter register 405. ) And a register 406.

The Manchester decoder 401 receives a Manchester coded signal from an external source, restores data and a clock, and outputs the data to a first multiplexer 403 and a second multiplexer 404.

The sampler 402 receives a signal generated by the start / stop bit generation and the shift controller 306 of the transmitter according to a board clock input from the outside, and restores the data and the shift clock to the first multiplexer 403. Output to the second multiplexer 404.

The first multiplexer 403 and the second multiplexer 404 select an input signal according to a mode selection signal input from the outside and output the selected signal to the shift register 405.

The shift register 405 shifts data input from the first multiplexer 403 according to the shift clock input from the second multiplexer 404 and outputs the data to the register 406.

The register 406 temporarily stores data input from the shift register 406 and outputs the data to the outside.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited to the drawings.

The present invention as described above, by using the TXD pin and RXD pin as a data channel, there is no need to transmit a clock signal to facilitate programming and by using the TXD pin and RXD pin as a data channel for bidirectional communication data bandwidth This has a growing effect.

Claims (7)

First shifting means for generating and adding a parity bit according to the parity enable signal and the even enable signal inputted from the outside and outputting serial data shifted according to the shift clock inputted from the outside; Manchester coding means for outputting Manchester coded serial data received from the first shifting means according to a board clock input from the outside; A start / stop bit generation and shifting control means for transmitting the serial data received from the first shifting means after generating a start bit according to a board clock input from the outside, and generating and transmitting a stop bit after transmission; And Selection means for selecting and outputting one of the signals input from the Manchester coding means and the start / stop bit generation and shifting control means in accordance with a mode selection signal input from an external device Bidirectional synchronous communication transmission device comprising a. The method of claim 1 The first shifting means, Storage means for storing a byte to be transmitted from outside; Parity generating means for generating and outputting parity according to the transmitted bytes received from the storage means; Parity control means for adjusting and outputting the parity received from the parity generating means according to the enable signal and the even enable signal received from the outside; Second shifting means for receiving the adjusted parity from the parity control means and outputting the shifted parity; And Third shifting means for receiving the parity signal from the second shifting means according to the shift clock received from the outside and adding the parity signal to the transmission byte received from the storage means, and then performing shifting to output data in series Bidirectional synchronous communication transmission device comprising a. Manchester decoding means for restoring and outputting the data and the shift clock from the Manchester coded signal received from the outside; Sampling means for receiving a signal consisting of a start bit, a data to be transmitted, and a stop bit from an external device according to a board clock input from the outside to restore and output the data and the shift clock; And First shifting means for outputting parallel data obtained by shifting a signal received from the Manchester decoding means and the sampling means according to a shift clock Bidirectional synchronous communication receiving device comprising a. The method of claim 3, wherein The first shifting means, First selecting means for selecting one of the Manchester decoding means and the data signal input from the sampling means according to a mode selection signal input from the outside; Second selection means for selecting one of the Manchester decoding means and the shift clock signal received from the sampling means and outputting the selected one; Second shifting means for outputting parallel data obtained by shifting the data signal received from the first selection means according to the shift clock received from the second selection means; And Storage means for temporarily storing a signal received from the second shifting means and outputting the signal externally Bidirectional synchronous communication receiving device comprising a. First shifting means for generating and adding a parity bit according to a parity enable signal and an even enable signal input from an external source and outputting serial data shifted according to a shift clock input from an external source; Manchester coding means for outputting Manchester coded serial data received from the first shifting means according to a board clock input from the outside; A start / stop bit generation and shifting control means for transmitting the serial data received from the first shifting means after generating a start bit according to a board clock input from the outside, and generating and transmitting a stop bit after transmission; First selection means for selecting and outputting one of the signals input from the Manchester coding means and the start / stop bit generation and shifting control means according to a mode selection signal input from an external device; Manchester decoding means for restoring and outputting the data and the shift clock from the Manchester coded signal received by the first selection means; Sampling means for receiving a signal consisting of a start bit, a data to be transmitted, and a stop bit from the first selection means, restoring the data and the shift clock according to a board clock input from the outside; And Second shifting means for outputting parallel data obtained by shifting a signal received from the Manchester decoding means and the sampling means according to a shift clock; Bidirectional synchronous communication transceiver comprising a. The method of claim 5 The first shifting means, First storage means for storing a byte to be transmitted from outside; Parity generating means for generating and outputting parity according to the transmitted bytes received from the first storage means; Parity control means for adjusting and outputting the parity received from the parity generating means according to the enable signal and the even enable signal received from the outside; Third shifting means for receiving the adjusted parity from the parity control means and shifting the output; And Fourth shifting means for receiving the parity signal from the third shifting means in accordance with the shift clock received from the outside and adding the parity signal to the transmission byte received from the first storage means, and then performing shifting to output data in series. Bidirectional synchronous communication transceiver comprising a. The method according to claim 5 or 6, The second shifting means, Second selecting means for selecting one of the Manchester decoding means and the data signal input from the sampling means according to a mode selection signal input from the outside; Third selecting means for selecting one of the Manchester decoding means and the shift clock signal received from the sampling means and outputting the selected one; Fourth shifting means for outputting parallel data obtained by shifting the data signal received from the second selecting means according to the shift clock received from the third selecting means; And Second storage means for temporarily storing the signal received from the fourth shifting means and outputting the signal to the outside Bidirectional synchronous communication transceiver comprising a.