KR19990021024A - Serial high speed communication device and method - Google Patents

Abstract

The present invention relates to a high speed data communication apparatus and method in serial communication, and to increase the amount of data included in one transmission symbol by corresponding to a symbol having various levels of data to be transmitted, thereby enabling high speed data transmission. It is an object of the present invention to provide a high speed communication apparatus and method.

According to the apparatus and method for serial high speed communication according to the present invention, unlike the conventional method of serially transmitting digital data using a single signal line, various levels of transmission symbols are set and data to be transmitted is converted into transmission units. By transmitting the transmission symbol corresponding to the set transmission level, high-speed data transmission is possible in serial communication, thereby improving the satisfaction of a user who requires communication of various information through serial communication.

Description

Serial high speed communication device and method

The present invention relates to a high speed data communication apparatus and method in serial communication, and to increase the amount of data included in one transmission symbol by corresponding to a symbol having various levels of data to be transmitted, thereby enabling high speed data transmission. It is an object of the present invention to provide a high speed communication apparatus and method.

As the demand for personal computers increases explosively, the demand for communication between each personal computer and a large computer is expanding. In particular, due to the advantages of low capital, easy access to external I / O devices, advancement to a local area network (LAN), and communication speed and wide degree of freedom of data, network configuration through communication between personal computers is difficult. It is commonly used to improve resource sharing and reliability. However, for the network configuration, in addition to the format of data to be exchanged, information about control information and timing information depending on hardware must be set in advance, which is called a protocol.

The protocol may be largely divided into a serial communication method and a parallel communication method. The serial communication method is a communication method for transmitting data applied in parallel from the main bus to the outside using a single data signal line, and applying data input in series from the outside to the main bus in parallel, RS-232C, RS- 422, RS-423 and X.21 have been adopted as standards. In addition, the parallel communication method is a communication method for transmitting or receiving data using a plurality of data signal lines, and the data communication speed increases in proportion to the number of data signal lines compared to the serial communication method, but the price increases. Have

Meanwhile, the serial communication method is classified into a synchronous communication method and an asynchronous communication method according to a method of securing synchronization required for both terminals to communicate data. The former transmits a synchronization signal between both terminals. The latter method uses a start bit and a stop bit when transmitting data.

Hereinafter, a description will be given of RS-232C, which is the most commonly used asynchronous serial communication device in personal computers, with reference to FIGS.

The RS-232C asynchronous serial communication apparatus according to the prior art receives an address, an enable signal and an input / output command signal RD / WR from the central processing unit 1 inside the computer as shown in FIG. A communication control unit 2 for outputting a control signal for controlling and outputting an interrupt to the central processing unit 1 according to states such as data transmission and reception, and a clock generator for generating and outputting a clock to be used for data transmission ( 3) and a control signal from the communication controller 2, a clock signal from the clock generator 3, and a control signal indicating a transmission and reception state to the communication controller 2, and A parallel-to-serial conversion section 4 for converting serially input data from the central processing section 1 in parallel to a prescribed format and outputting the serial-to-serial conversion section 4; It consists of the data to the level converting unit (5) for converting a signal system to be used on the external interface.

Hereinafter, the operation of the RS-232C communication device which is an asynchronous serial communication device will be described.

The central processing unit 1 controls the RS-232C interface and transfers data to be transmitted to the outside via a data bus. The parallel-serial converter 4 receives data from the central processor 1 in parallel via a bus and converts the data into serial data for serial communication, and transmits data in accordance with the data format shown in FIG. 2. Will be constructed.

3 shows a timing diagram of a signal configured as described above and a signal passing through the level converter 4 using the negative logic conversion method. As shown in FIG. 3, a digital signal represented by '0' or '1' is a signal of a TTL (Transistor-Transistor Logic) level having 0 Volts or 5 Volts. The level converter 5 receiving the signal of the TTL level converts the digital signals of '0' and '1' having the TTL level into signals of + V volts and -V volts for transmission through a cable. Here, V volt is a value existing within a level of 3 volts or more and 15 volts or less.

The asynchronous serial communication apparatus according to the related art, which is configured as described above, has a disadvantage in that a data transmission speed is slower than that of the parallel communication apparatus because data is serially transmitted using a single signal line.

Accordingly, an object of the present invention is to solve such a problem, and to set the level of the transmission symbol in various ways, and to form a unit by combining a certain portion of the data to be transmitted, the symbol corresponding to the various transmission level set The present invention provides a serial high speed communication apparatus and method for increasing data transmission speed in serial communication.

1 is a block diagram of an asynchronous serial communication apparatus according to the prior art,

2 is a data format of the RS-232C communication method;

3 is an operation timing diagram of a level converter according to the prior art;

4 is a block diagram of a serial high speed communication device according to the present invention;

5 is a block structure diagram of a multi-level converter of FIG. 4;

6 is an operation timing diagram of a serial high speed communication device according to the present invention.

<Description of the code | symbol about the principal part of drawing>

10: central control unit 20: communication control unit

30: clock generator 40: parallel-serial converter

50: multi-level converter 51: transmission data converter

51-1: Transmission unit converter 51-2: Symbol mapping unit

52: Received data reduction unit 52-1: AD conversion unit

52-2: Receiving unit reduction unit 53: Data transmission / reception switch unit

53-1: 1st switch part 53-2: 2nd switch part

Serial high speed communication apparatus and method according to the present invention for achieving the above object, unlike the conventional transmission of serial data in a digital form using a single signal line, variously set the level of the transmission symbol, the constant of the data to be transmitted By bundling parts to form one unit and transmitting the symbols corresponding to various transmission levels, the data transmission speed can be increased in serial communication.

As shown in FIG. 2, the serial high speed communication apparatus according to the present invention receives an address, an enable signal, an input / output command signal from the central processing unit 10 inside the computer, and outputs a control signal for controlling input / output of data. A communication controller 20 for outputting an interrupt to the central processing unit 10 according to a state of data transmission and reception, a clock generator 30 for generating and outputting a clock to be used for data transmission, and the communication controller ( 20, a control signal is received from the clock generator 30, and a control signal indicating a transmission and reception state is output to the communication control unit 20, and in parallel from the central processing unit 10. A parallel-to-serial converter 40 for converting the input data into a serial format suitable for a prescribed format and outputting the serial data input from the parallel-serial converter 40; An emitter tied by a certain bit is configured along one of the symbols having a different level instead of the level of the binary form as a multi-level conversion unit 50 to output to an external interface.

The multi-level converting unit 50 receives the serial data from the parallel-serial converting unit 40 during data transmission, converts the data into symbols of various levels, and outputs the converted data to an external interface. Receiving data reduction unit for receiving a received symbol having a variety of levels from the external interface at the time of data reception to reduce to a serial bit stream (bit stream) for serial communication and output to the parallel-to-serial converter 40 ( 52 and a data transmission / reception switch unit 53 which receives the input / output command signal from the central processing unit 10 and enables the transmission data conversion unit 51 and the reception data reduction unit 52, respectively. .

The transmission data converter 51 receives a serial unit data transmission unit conversion unit 51-1 for dividing the data into units to be transmitted, and a signal input for each transmission unit from the transmission unit conversion unit 51-1. It is composed of a symbol mapping unit (51-2) that is received and converted to the corresponding transmission symbol transmitted.

The received data reduction unit 52 receives an AD symbol having various levels and converts it into a digital signal having a size equal to the number of bits of a transmission unit, and the AD converter 52-1. ) Is a reception unit reduction unit 52-2 which receives a signal input in a transmission unit from) and outputs the signal to the serial-parallel conversion unit 40.

The data transmission / reception switch unit 53 receives a data input / output command signal from the central processing unit 10 and a first switch unit 53-1 for controlling the connection with the serial-parallel conversion unit 40; The second switch unit 53-2 receives a data input / output command signal from the central processing unit 10 and controls a connection with an external interface.

Hereinafter, a high speed data transmission apparatus for transmitting two bits in one transmission unit in serial communication according to the present invention will be described in detail with reference to FIGS. 2 to 6.

The central processing unit 10 controls the serial communication device and transfers data to be transmitted to the outside via a data bus. In addition, the parallel-serial converter 40 receives data from the central processing unit 10 in parallel via a data bus, converts the data into serial data for serial communication, and transmits the data according to the data format shown in FIG. 2. It will form the data type.

The data configured in the serial form as described above is input to the multi-level converter 50 to determine the transmission symbol and transmit it to the external interface. First, when the central processing unit 10 generates the input / output command signal of the output WR, the transmission / reception switch unit 53 transfers the transmission data conversion unit 51 to the parallel-serial conversion unit 40 and externally. Connect with the interface to prepare for transmission. Subsequently, the transmission unit converter 51-1 combines serially input data by 2 bits to configure one transmission unit, and the transmission symbol mapping unit 51-2 receives the input and maps the corresponding transmission symbol. Let's do it.

According to the timing diagram shown in FIG. 6 (b), since the data inputted in series is converted into one transmission unit every two bits, 4 (= Since four types of data are possible, four types of transmission symbol levels must exist. 6 (c) shows an example in which four types of transmission symbol levels are set to ± 4 volts and ± 12 volts. In general, since the data to be transmitted has an arbitrary value, it is preferable that the four types of levels set the same interval between the levels. Transmitted symbols mapped to various levels have a doubled period compared to the digital signal shown in FIG. Therefore, when data in the form of a bit stream is transmitted in the form of a transmission symbol, since the actual transmitted signal is transmitted twice over the cable, when the clock speed is increased and transmitted in the same manner as the period of the digital signal, the transmission is actually performed. The amount of information that will be doubled.

On the other hand, when the central processing unit 10 generates the input / output command signal of the input RD, the transmission / reception switch unit 53 receives the data reduction unit 52 in order to receive the transmitted symbol as described above. The parallel-to-serial converter 40 is connected to an external interface to prepare for reception, and the AD converter 52-1 receives a received symbol input from an external interface and outputs an analog signal with the same number of bits as the transmission unit. Perform digital conversion. Subsequently, the reception unit reduction unit 52-2 converts the data of the reception unit output from the AD conversion unit 52-1 into serial and outputs the serial-parallel conversion unit 40 to receive the multilevel reception. The symbol may be received in the form of a bit stream before transmission.

Hereinafter, a serial high speed communication method according to the present invention will be described.

The serial high speed communication method according to the present invention receives an address, an enable signal, an input / output command signal from a central processing step, outputs a control signal for controlling the input / output of data, and performs the central processing according to data transmission and reception conditions. A communication control step of outputting an interrupt to the step; a clock generation step of generating and outputting a clock to be used for data transmission; a control signal is inputted from the communication control step, and a clock signal is received from the clock generation step; A parallel-serial conversion step of outputting a control signal indicating a state to the communication control step, converting serially input data from the central processing step into a serial format suitable for a prescribed format, and the parallel-serial conversion step; Binary format by grouping bits of serial data input from the Instead of along one of the symbols having a different level is composed of a multi-level converting step of outputting to an external interface.

In the multi-level conversion step, a data transmission step of receiving data in serial form from the parallel-serial conversion step during data transmission, converting the data into symbols of various levels, and outputting the data to an external interface; A received data reduction step of receiving a received symbol having a level and reducing the result into a serial bit stream for serial communication and outputting the parallel-serial conversion step; receiving an input / output command signal from the central processing step and converting the transmission data It consists of a data transmission and reception switching step that enables each of the steps and the received data reduction step.

The transmission data conversion step includes a transmission unit conversion step of receiving serial data and classifying the data into transmission units, and receiving a signal input for each transmission unit from the transmission unit conversion step and converting the signal into a corresponding transmission symbol and transmitting the symbol mapping. It consists of steps.

The received data reduction step may include an AD conversion step of receiving a received symbol having various levels and converting the received symbol into a digital signal having the same size as the number of bits of a transmission unit, and receiving the signal input in the transmission unit from the AD conversion step. It consists of a receiving unit reduction step outputting to a parallel conversion step.

The data transmission / reception switching step includes a first switching step of receiving a data input / output command signal from the central processing step and controlling a connection with the serial-parallel conversion step, and receiving a data input / output command signal from the central processing step. A second switching step controls the connection with the external interface.

Hereinafter, the operation of the serial high speed communication method according to the present invention will be described with reference to FIG.

In the central processing step, data to be transmitted to an external interface is transferred to the parallel-serial conversion step in parallel through a data bus.In the parallel-serial conversion step, data is received in parallel and converted into serial data for serial communication. Configure in the form of transmission. First, when the input / output command signal of the output is generated in the central processing step, the serial data is inputted into the transmission unit conversion step connected by the transmission / reception switching step, divided into transmission units, and corresponding symbol mapping step is performed. It is mapped to a transmission symbol and transmitted to an external interface through the transmission / reception switching step. In this case, when the number of bits constituting one transmission unit is n, the transmission symbol is It is necessary to have two kinds, and the intervals between the levels are preferably the same.

On the other hand, when the input / output command signal of the input is generated in the central processing step, in order to receive the transmitted symbol, the received data reduction step is connected to the parallel-serial conversion step and the external interface in the transmission / reception switching step. In the AD conversion step, the reception symbol received from the external interface is received to perform analog-to-digital conversion with an output of the same number of bits as the transmission unit. Subsequently, in the reception unit reduction step, the data of the reception unit output in the AD conversion step may be serially converted and output to the serial-parallel conversion step, thereby receiving a multi-level received symbol in the form of a bit stream before transmission. .

According to the apparatus and method for serial high-speed communication according to the present invention described above, various levels of transmission symbols are set, a certain portion of data to be transmitted is bundled, and a unit is configured to transmit the symbols corresponding to the various transmission levels. As a result, high-speed data transmission is possible in serial communication, thereby improving the satisfaction of a user who requires communication of various information through serial communication.

Claims (10)

In the serial communication device performing transmission and reception using a digital signal, Communication control unit which receives address, enable signal, input / output command signal from central processing unit inside computer, outputs control signal for controlling input / output of data, and outputs interrupt to the central processing unit according to data transmission and reception. ; A clock generator for generating and outputting a clock to be used for data transmission; A control signal is input from the communication control unit, a clock signal is input from the clock generation unit, and a control signal indicating a transmission and reception state is output to the communication control unit, and data input in parallel from the central processing unit in a prescribed format. A parallel-serial conversion unit suitable for converting and outputting in series; And A serial high-speed communication device comprising a multi-level conversion unit for outputting the serial data input from the parallel-to-serial conversion unit by a predetermined bit by selecting one of the symbols having a variety of levels instead of a binary type level to an external interface. . The method of claim 1, wherein the multi-level conversion unit A transmission data converter which receives serial data from the parallel-serial converter and converts the data into various transmission symbols and outputs them to an external interface; A received data reduction unit which receives a received symbol having various levels from an external interface when receiving data and reduces the received symbol into a serial bit stream for serial communication and outputs it to the parallel-serial converter; And And a data transmission / reception switch unit which receives the input / output command signal from the central processing unit and enables the transmission data conversion unit and the reception data reduction unit, respectively. The method of claim 2, wherein the transmission data conversion unit A transmission unit conversion unit which receives serial data and divides the data into transmission units; And And a symbol mapping unit configured to receive a signal input in a transmission unit from the transmission unit conversion unit, convert the signal into a corresponding transmission symbol, and transmit the converted symbol. The method of claim 2, wherein the received data reduction unit An AD converter which receives a received symbol having various levels and converts the received symbol into a digital signal having the same size as the number of bits of a transmission unit; And And a receiving unit reducing unit which receives a signal input in a transmission unit from the AD converter and outputs the signal to the serial-parallel converter. The data transmission / reception switch unit according to claim 2, wherein the data transmission / reception switch unit A first switch unit receiving a data input / output command signal from the central processing unit and controlling a connection with the serial-parallel conversion unit; And And a second switch unit configured to receive a data input / output command signal from the central processing unit and control a connection with an external interface. In the serial communication method for transmitting and receiving using a digital signal, A communication control step of receiving an address, an enable signal, an input / output command signal from the central processing step, outputting a control signal for controlling input and output of data, and outputting an interrupt to the central processing step according to data transmission and reception conditions. ; A clock generation step of generating and outputting a clock to be used for data transmission; Receives a control signal from the communication control step, receives a clock signal from the clock generation step, outputs a control signal indicating a transmission and reception state to the communication control step, and specifies data input in parallel from the central processing step. A parallel-serial conversion step of converting and outputting serially to suit the formatted format; And Serial high speed communication comprising a multi-level conversion step of outputting the serial data input from the parallel-to-serial conversion step by bit for a symbol having a variety of levels instead of a binary type level to the external interface. Way. 7. The method of claim 6, wherein the multilevel conversion step is A transmission data conversion step of receiving serial data from the parallel-serial conversion step, converting the data into symbols of various levels, and outputting the data to an external interface; A received data reduction step of receiving a received symbol having various levels from an external interface when receiving data and reducing the received symbol to a serial bit stream for serial communication and outputting the parallel-to-serial conversion step; And And a data transmission / reception switching step of receiving an input / output command signal from the central processing step and enabling the transmission data conversion step and the reception data reduction step, respectively. 8. The method of claim 7, wherein converting the transmission data A transmission unit conversion step of receiving serial data and classifying the data into transmission units; And And a symbol mapping step of receiving a signal input for each transmission unit from the transmission unit conversion step, converting the signal into a corresponding transmission symbol, and transmitting the same. The method of claim 7, wherein the receiving data reduction step An AD conversion step of receiving a received symbol having various levels and converting the received symbol into a digital signal having a size equal to the number of bits in a transmission unit; And And a receiving unit reduction step of receiving a signal inputted from the AD conversion step in a transmission unit and outputting the serial-parallel conversion step. The method of claim 7, wherein the data transmission and reception switching step A first switching step of receiving a data input / output command signal from the central processing step and controlling a connection with the serial-parallel conversion step; And And a second switching step of receiving a data input / output command signal from the central processing step and controlling a connection with an external interface.