KR100325813B1 - Method for Transmitting Data in the Bi-direction Communication System - Google Patents

Abstract

The present invention relates to a bidirectional communication system used for an interface between a computer and a peripheral device. The present invention relates to a falling edge and a rising edge when transmitting data from a host computer to a peripheral device based on an existing ECP protocol of IEEE 1284 mode. rising) relates to a data transmission method of a bidirectional communication system capable of improving communication speed by transmitting data at an edge point.

According to the present invention, by modifying the data transmission method of the ECP protocol in the IEEE 1284 mode, there is an advantage that can improve the communication speed between the computer and the printer without incurring additional costs.

Description

Method for Transmitting Data in the Bi-direction Communication System}

The present invention relates to a bidirectional communication system used for an interface between a PC and a peripheral device, and more particularly, polling of a clock transmitted when transmitting data from a host computer to a peripheral device based on the ECP protocol of the IEEE 1284 mode. The present invention relates to a data transmission method of a bidirectional communication system capable of improving communication speed by transmitting data to a falling edge and a rising edge.

In recent years, office automation (OA) devices such as printers, scanners, copiers and fax machines have become widespread. Each of these office automation devices has been developed a higher-performance product to expand its unique functions, but the production cost of the product is rising, adding to the economic burden on the consumer. For this reason, as office automation devices used independently of each other are integrated into one complex device, it is possible to solve some of the economic burdens of consumers. Such complex devices are commonly referred to as 'composite devices' or 'compositors'.

In general, a multifunction device, as is well known, is a multifunction terminal with a computer-interface function that has a function of interworking with a multifunction terminal in which a terminal existing as a single product, such as a facsimile machine, a scanner, a printer, a copier, etc. Refers to a multi function product (MFP).

Therefore, a new phenomenon occurs when there is only one terminal each.

In addition, the MFP supports the IEEE (Institute of Electrical and Electronics Engineers) 1284 standard as a two-way communication method for interfacing with a PC.

In general, the IEEE 1284 protocol is set up for compatibility with a bidirectional parallel interface between a PC and a peripheral device, and provides a path for bidirectional communication between the host computer and the peripheral device.

The ECP protocol is a mode compatible with peripheral devices such as printers and scanners. It is proposed by Microsoft and Hewlett-Packard Co., and is a bidirectional data transmission mode for transferring data from a PC to a peripheral device or a peripheral device to a PC.

According to the IEEE 1284 protocol, bi-directional communication speeds between PCs and peripherals can be about 50 to 100 times faster than parallel ports.

However, the data transmission method of the ECP protocol is faster than the parallel port method, but only when separate hardware is present. Even though the ECP protocol is used, hardware direct memory access (DMA) is used. ) High speed transmission is available only when channel is connected.

In addition, the conventional ECP protocol can be expected high speed communication speed, which is the advantage of the ECP protocol when a separate input and output chip is accompanied, but if such a separate input and output chip is not provided in the existing computer, The disadvantage is that it is very slow.

This is a cost burden for consumers who want to use it because it takes a lot of time when printing with a printer in the current Windows environment and sending a large amount of print data to the printer and requires a separate hardware or input / output chip. It has the disadvantage that it can be given.

Accordingly, an object of the present invention is to solve such a problem, and an object of the present invention is to provide a falling edge and a rising edge when transmitting data from a host computer to a peripheral device based on an existing ECP protocol of IEEE 1284 mode. The present invention provides a data transmission method of a bidirectional communication system capable of improving communication speed by transmitting data at an edge point.

1 is a forward timing diagram of a general ECP protocol,

2 is a reverse timing diagram of a general ECP protocol;

3 is a system configuration diagram showing a connection between a general computer and a peripheral device;

4 is a block diagram showing the internal structure of a peripheral device and a computer for carrying out the present invention;

5 is a forward timing diagram of a bidirectional communication system for carrying out the present invention;

6 is a reverse timing diagram of a bidirectional communication system for carrying out the present invention;

7 is a data transmission flowchart of a communication system for carrying out the present invention.

<Description of Symbols for Major Parts of Drawings>

100: computer 110: central processing unit

120: memory unit 130: program unit

140,240: Parallel port 200,300: Multifunction device

210: control unit 220: storage unit

230: panel portion 250: reading portion

260: printing unit 270: network control unit (NCU)

In order to achieve the above object, a feature of the present invention is to transmit data at falling edge and rising edge points when data is transmitted from a host computer to a peripheral device using a data transmission method of a bidirectional communication system. The point is that communication speed can be improved.

1 is a forward timing diagram of a general ECP protocol, for example, a timing diagram when data is transmitted from a computer to a peripheral device such as a printer, and FIG. 2 is a reverse timing diagram of a general ECP protocol, for example, a printer. A timing diagram when data is transferred from a peripheral device such as a computer to the computer.

3 is a system configuration diagram illustrating a connection between a general computer and a peripheral device.

As shown, the peripheral device 200 is used in connection with the host computer 100, and receives the data transmitted from the host computer 100 in the peripheral device 200, and also peripheral data received from the host computer 100 The printing unit 260 of 200 prints.

4 is a schematic block diagram showing an internal configuration of a peripheral device and a computer for carrying out the present invention.

In the host computer 100, the central processing unit 110 controls the host computer 100 as a whole according to a system program stored in the memory unit 120.

The memory unit 120 stores data for transmitting to the peripheral device 200 and a system program for driving the host computer.

The program unit 130 includes a program for creating data for output to the peripheral device 200.

The parallel port 140 is used to transmit data to the peripheral device 200 and a control signal for transmitting data generated by the central processing unit 110 of the host computer 100.

In the peripheral device 200, the controller 210 controls the peripheral device 200 as a whole according to a system program stored in the storage 220.

The storage 220 stores data transmitted from the host computer 100 and data read by the reader 250.

The panel 230 includes a key matrix including a function key for setting a function on the peripheral device 200 menu, and provides the controller 210 with key data generated according to a key operation.

When the transmission unit or copy mode of original data is set to perform a fax function or a copy function, the reading unit 250 scans an inserted document, converts it into image data, and transmits the image data to the storage unit 220.

The parallel port 240 transmits a control signal generated from the peripheral device 200 to the host computer 100 and is used to transmit data received from the peripheral device 200 through the internet network to the host computer 100.

The print unit 260 prints the print data transmitted from the host computer 100 and stored in the storage unit 220 according to the print control signal of the controller 210.

The network control unit (NCU) 270 operates according to a control signal of the controller 210 to form a communication loop with the Internet network, and performs functions such as sending a signal and receiving a call signal.

The above description shows the process in which the host computer 100 transmits data to be printed to the peripheral device 200, and the timing diagrams transmitted to the parallel port are shown in FIGS. 5 and 6.

Hereinafter, the procedure of the data transmission method of the bidirectional communication system of the present invention will be described with reference to FIGS. 5 to 7.

First, FIG. 5 is a timing diagram of forward data transfer between a computer and a peripheral device.

The transmission data shown in FIG. 5 transmits data by a host clock and a PeripherAck response signal.

This procedure will be described as follows.

One; When a data transfer command is applied, the host computer 100 places the data to be transmitted on the data line, and a data cycle occurs when the host response is high.

2; The host computer 100 transmits data over the polling edge when the host clock is the polling edge.

3; The host computer 100 transmits data over the rising edge when the host clock is the rising edge.

to the next. FIG. 6 is a backward transmission timing diagram for transmitting data from a peripheral device to a computer, and performs the same procedure as FIG. 5, but reverse transmission is possible through the nReverseRequest signal line and the nAckReverse signal line.

That is, as the nReverseRequest signal and the nAckReverse signal are turned low, the host computer can switch from the transmission mode to the reception mode and receive data from the peripheral device.

One; The host computer 100 represents a transfer from the peripheral device to the host computer 100 by setting nReverseRequest low.

2; Peripherals indicate that they can be received by setting nAckReverse low.

3; The peripheral places the data to send on the data line, and a data cycle occurs when the peripheral response is high.

4; The peripheral detects that the peripheral clock is a falling edge and transmits data over the falling edge.

5; The peripheral detects that the peripheral clock is a rising edge and transmits data over the rising edge.

In more detail with reference to Figure 7, in the system for performing bidirectional communication through the data line between the computer and the peripheral period,

First, a print command is applied to the host computer 100 by a key input by a user (S10).

Thereafter, the host computer 100 determines whether there is data to be printed (S20). Here, the determination of whether there is data to be printed is possible by the controller 210 checking whether there is data to be printed in the memory unit 120.

If there is data to be printed, the memory unit 120 reads the data to be printed (S30). Here, a buffer (not shown) for storing data is one component of the memory unit 120.

After reading the data, the host computer 100 locates the data to be transmitted on the data line 1 as shown in FIG. 5, and detects the falling edge and the rising edge of the host clock to transmit the data (S40).

When the falling edge and the rising edge are detected, the host computer 100 transmits data to the peripheral device at the time when the falling edge and the rising edge occur (S50).

The transmission step is repeated from the step of reading the data to be printed until all the data to be printed are transmitted.

The above shows the data transfer from the computer to the peripheral device, on the contrary, the reverse procedure is possible from the peripheral device to the computer by performing the same procedure as described above.

Terminologies used herein are terms defined in consideration of functions in the present invention, which may vary according to the intention or customs of those skilled in the art, and the definitions should be based on the contents throughout the present application. will be.

In addition, since the present invention has been described through the preferred embodiment of the present invention, in view of the technical difficulty aspects of the present invention, those having ordinary skill in the art can easily be different from another embodiment of the present invention. Since modifications may be made, it is obvious that both the embodiments and modifications cited in the above description belong to the claims of the present invention.

As described in detail above, according to the data transmission method of the bidirectional communication system according to the present invention, a falling edge when transmitting data from the host computer to the peripheral device based on the existing ECP protocol of the IEEE 1284 mode. By transferring data at the rising edge as well as at, the advantage is that the communication speed between the host computer and the peripherals can be improved without incurring additional costs.

Claims (3)

In a data transmission method of a bidirectional communication system performing bidirectional communication through a data line between a computer and a peripheral device: Transitioning one of the devices to a transmission standby state for transmitting the data to transfer data from one of the computer and the peripheral device to the other device; Detecting a falling edge and a rising edge of a reference clock generated in the one device; And Transmitting the data pending transmission within the one device to the other device through the data line at the time when the detected falling edge and the rising edge are detected; And repeating the steps from the switching step to the transmitting step until all of the data is completely transmitted. The method of claim 1, wherein the reference clock, A data transmission method of a bidirectional communication system, characterized in that the host clock and the peripheral clock. The method according to claim 1 or 2, Storing said data in said one device; Dividing the stored data into a predetermined size, and transmitting the divided data of the predetermined size from the one device to the other device at the time when the falling edge and the rising edge of the reference clock are detected. Data transmission method of the bidirectional communication system, characterized in that.