JPH07274155A - Text/graphic processing video tex interface device - Google Patents

Abstract

PURPOSE: To reduce the number of parts to reduce the cost by providing an interface processor only for video tex where various controllers or the like provided in a video tex terminal machine are incorporated in one chip. CONSTITUTION: One color value in the case of read of video data from a video rem connected to a video tex processing part 106 by a system microprocessor consists of four plans. A peripheral selection signal is generated by the processor and is inputted to the processing part 106. Then, a microprocessor interface part 106a of the processing part 106 chip-enables a printer interface part 106c to provide video tex related data. Thus, the interface part 106c prints video tex related data, which is generated in the processor and is inputted through the interface part 106a, by a printer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a character graphics processing interface of a videotex, and more specifically, a videotex terminal which can be searched by a user when a database storing graphic character information is provided as a public communication network. The present invention relates to a text / graphics processing videotex interface device that satisfies various videotex standards only by changing the software without changing the design of the hardware when acquiring and using necessary information on a machine.

[0002]

2. Description of the Related Art In a conventional videotex terminal, a system microprocessor is used as a central component, and peripheral controllers, that is, a graphic controller, a printer port controller, a keyboard controller, a serial communication controller, etc., are respectively constituted as dedicated chips to form a system. It was

[0003]

However, in the videotex terminal as described above, the system is configured by using various peripheral controllers centering on the system microprocessor as dedicated chips. Not only is the configuration complicated, but the screen resolution is reduced, the data processing speed is slow, and many circuit components are used around the system microprocessor. There was a problem that productivity was also reduced.

Therefore, in view of the above problems, an object of the present invention is to integrate various peripheral controllers and the like used in a videotex terminal centering on a system microprocessor into a single chip to simplify the system. It is an object of the present invention to provide a text / graphics processing videotex interface device capable of improving the processing speed of videotex-related data by implementing the technology. And, in order to satisfy the above-mentioned object, the present invention particularly comprises a videotex processing means connected between a system microprocessor and an external interface and capable of processing various video characters and graphic information. did.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and reads and transfers English characters, Korean characters, Chinese characters, special characters and the like expressed by a video processor by a character set ROM. The system microprocessor and the data and addresses transferred from the system microprocessor are directly interfaced and processed to transfer videotex-related data to an external monitor, printer port and serial communication port and received from a keyboard including them. Video tex processing means for processing data to be processed and interfacing with the system microprocessor, and buffer means for preventing data and address collision at the time of interface between the video tex processing means (custom type semiconductor) and the system microprocessor. Characterized by . Further, the videotex processing means includes a microprocessor interface unit that plays a role of directly connecting the system microprocessor and the videotex processing unit, a graphic controller unit that is connected to the microprocessor interface unit and controls data, and a printer. It includes a Centronics compatible parallel printer interface that controls the videotex related data to be printed and can detect the printer status, a serial communication interface, and a keyboard interface that controls the keyboard. It is characterized by

[0006]

[Function] Based on the above-mentioned configuration, the system microprocessor displays English characters, Korean characters, and
When Kanji and special characters are read in a character set ROM and transferred to the videotex processing means, the videotex processing means directly interfaces with the data and address transferred from the system microprocessor to process them, and an external monitor, printer port and serial Transfers videotex-related data to the communication port and processes data received from the keyboard, including them, to interface with the system microprocessor.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a text / graphics processing videotex interface device according to the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram of a text / graphics processing videotex interface device according to the present invention. As shown in FIG. 1, the text / graphics processing videotex interface device accesses peripheral chips while multiplexing an address bus and a data bus. It has a system microprocessor 100, and an output address buffer 101b and a data buffer 101a for buffering and transmitting and receiving so that the address and data transmitted by the system microprocessor 100 do not collide with the address and data received from peripheral devices. The buffer unit 101 (see FIG. 3) and the buffer unit 1
Character set ROM 105 that outputs font data such as Korean characters, Chinese characters, English characters, special characters, etc. in the standard character set via the data bus according to the address output from 01
And various parameters or vector tables necessary for the videotex are stored, the system rem 102 used by the system microprocessor 100 in the scratch pad memory, the videotex graphic information encoding software and the VT-220 character information encoding. The software program is built in, and the buffer unit 101
When the power is turned off, the system ROM 103 that controls all operations of the videotex terminal device with the address output by the corresponding program, the parameters of the videotex encoding program of the system ROM 103 and the data output from the buffer unit 101 are turned off. A system backup REM 104 that outputs after backup and when necessary, and a modem 107 that interfaces with a database that stores videotex information that is connected to a general public communication network and is located at a long distance, and that provides the buffer unit 101 with the modem 107. The videotex processing unit 106 that directly interfaces with the system microprocessor 100 and the modem 107 through the buffer unit 101 and the videotex related information provided by the videotex processing unit 106 are displayed to the user through a screen. A monitor 108 to provide a printer port 109 for outputting a videotex related data in the videotex processing unit 106 and the connected printer,
A serial communication port 110 that is connected to the videotex processing unit 106 to send and receive data between terminals or to an independent computer; and the videotex processing unit 1
And a keyboard 111 for transmitting various commands and inputting characters, numbers, special symbols and the like.

The videotex processing unit 106 is also provided.
2, the graphic controller unit 106b, the printer interface unit 106c, the serial communication interface unit 106d, and the keyboard interface unit 10 that are always included in the videotex terminal.
The microprocessor interface unit 1 which plays a role of directly connecting the 6e to the system microprocessor 100.
06a, a graphic controller unit 106b for controlling graphics, a Centronics compatible parallel printer interface unit 106c for controlling data to be printed to the printer to detect the state of the printer, and serial communication for serial communication. The interface unit 106d and the keyboard interface unit 106e that controls the keyboard 111 are included.

As shown in FIG. 3, the data buffer 101a, the address buffer 101b, and the read / write signal control unit 101c are connected to each other in order to provide an interface between the system microprocessor 100 and the videotex processing unit 106, as described above. It is equipped.

The operation of the text / graphics processing videotex interface device according to the present invention constructed as described above will be described in detail with reference to FIGS. In the videotex terminal, a buffer 101 is provided with a data buffer 101a and an address buffer 101b in order to provide an interface between the system microprocessor 100 and the videotex processing unit 106 described above, thereby preventing data-address collision. Buffer 1
01a uses a Titl (TTL) chip as bidirectionality, the enable signal of the system microprocessor 100 is used for the control, and the address buffer 101b is unidirectional, which also uses the Titil (TTL) chip. The address latch enable signal of the system microprocessor 100 is used for the control.

Then, the system microprocessor 10
Looking at the interface state between 0 and the videotex processing unit 106, first, the system microprocessor 100
The 8-bit addresses AD0 to AD7 generated in step 10 are transmitted through the data buffer 101a to the videotex processing unit 10
6 to 8-bit data buses D0 to D7, and 4-bit address bus A through the address buffer 101b.
0 to A3.

Then, the system microprocessor 10
The read signal (RD) and the write signal (WR) generated at 0 are provided to the read signal (RD) and the write signal (WR) of the videotex processing unit 106 through the read / write signal control unit 101c. Then, the system microprocessor 10
0 peripheral chip selection signals PCS0, PCS1, PCS
2, PCS3 are provided to the chip enables CE1, CE2, CE3, CE4 of the videotex processing unit 106, respectively.
S1, PCS2 and PCS3 are videotex processing units 10
Each graphic controller unit 1 included in 6
06b, a serial communication interface unit 106d,
It is used as information for controlling the keyboard interface unit 106e and the printer interface unit 106c.

Then, the system microprocessor 10
0 interrupt signals INT1 and INT2, interface preparation signal (READY) and reset signal (RESET)
Is an interrupt signal I of the videotex processing unit 106.
NT1, INT2, preparation signal (RDY) and reset signal (RES
ET). Then, the videotex processing unit 10
The six interrupt signals INT1 and INT2 are composed of two, and are composed of the interrupt signal INT1 output from the keyboard interface unit 106e and the interrupt signal INT2 output from the serial communication interface unit 106d. The interrupt signal INT
Only when 1 and INT2 are in the logic "1" state, the system microprocessor 100 senses and executes the interrupt operation.

Further, the system microprocessor 100
When reading video data from a video rem connected to the videotex processing unit 106, one color value is 4
It consists of two plans. Therefore, in the videotex processing unit 106, a delay time is required for four video REM plans, but at this time, the processing time of the videotex processing unit 106 is delayed due to the operation cycle of the system microprocessor 100. Ready signal (R
DY) to the system microprocessor 100 to perform all the operations of the videotex processing unit 106,
When the logic "1" is output, the system microprocessor 100 again normally performs its own operation.

Further, the system microprocessor 100
More peripheral chip selection signals PCS0, PCS1, PCS
2, when one signal is selected and output from the PCS 3, the microprocessor interface unit 106a of the videotex processing unit 106 has a corresponding graphic controller unit 106b, printer interface unit 106c, and serial communication interface unit. 106
One of d and the keyboard interface unit 106e is chip-enabled to operate.

That is, the system microprocessor 10
When the peripheral chip selection signal PCS0 is generated at 0 and is input to the videotex processing unit 106, the microprocessor interface unit 10 of the videotex processing unit 106.
6a chip-enables the printer interface unit 106c to provide videotex-related data. Therefore, the printer interface unit 10
6c transfers the videotex-related data generated by the system microprocessor 100 and input through the microprocessor interface unit 106a to the printer port 109 shown in FIG. 1 for printing on the printer.

In such a method, the serial communication interface unit 106d and the keyboard interface unit 106e of the videotex processing unit 106 also operate by the chip enable signal input by being interfaced with the microprocessor interface unit 106a, and the system microprocessor 100. The videotex-related data of (1) is provided to the serial communication port 110 to be serially communicated between terminals or to an independent computer, and various commands of the keyboard 111 are provided to the system microprocessor 100.

On the other hand, the system microprocessor 100
The reset signal (RESET) of the system microprocessor 100 is set at the moment when power is supplied to the videotex terminal.
Is output to the videotex processing unit 106 to output each internal block, that is, the microprocessor interface unit 10.
6a, printer interface unit 106c, serial communication interface unit 106d, keyboard interface unit 106e, and graphic controller unit 106.
b will be initialized.

[0019]

As described above, according to the present invention,
By including a videotex dedicated interface processor in which various controllers that are always provided in a videotex terminal are built in one chip, the system microprocessor and the videotex processing means are directly interfaced. By improving the problems such as data processing speed when various peripheral input / output parts of the system microprocessor are used separately, and by improving the processing speed, and by realizing multiple functions with one custom semiconductor The peripheral circuits and the like can be simplified, the number of required parts can be significantly reduced, the cost of the terminal can be reduced, and the productivity in manufacturing can be improved.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a text / graphics processing videotex interface device according to the present invention.

FIG. 2 is a system configuration diagram showing the videotex processing unit of FIG. 1 in more detail.

3 is an explanatory diagram showing a state of a data interface between the system microprocessor of FIG. 1 and a videotex processing unit.

[Explanation of symbols]

 100 system microprocessor 101 buffer unit 102 system rem 103 system rom 104 system backup rem 105 character set ROM 106 videotex processing unit 106a microprocessor interface unit 106b graphic controller unit 106c printer interface unit 106d serial communication interface unit 106e keyboard interface unit 108 monitor 109 Printer port 110 Serial communication port 111 Keyboard

Claims (10)

[Claims] 1. A system microprocessor for transferring English characters, Korean characters, Chinese characters, special characters, etc. expressed by a video processor together with a control signal to be read and transferred by a character set ROM, and transferred from the system microprocessor. Interface and process the received data and address directly, transfer videotex related data to external monitor, printer port and serial communication port, process the data received from keyboard including them and interface with system microprocessor A video / text interface device for text / graphics processing, comprising: 2. The videotex processing means includes a graphic interface section for controlling graphics, a Centronics compatible printer interface section for controlling data to be printed on the printer and sensing the printer status, and serial communication. 2. A serial communication interface section for controlling the keyboard, a keyboard interface section for controlling a keyboard, and a microprocessor interface section for directly connecting a graphic controller including the interface section to a system microprocessor. Described text graphics processing videotex interface device. 3. The text / graphics processing videotex interface device according to claim 1, further comprising a buffer unit for preventing data collision between the system microprocessor and the videotex processing means. 4. A bidirectional data buffer for buffering an 8-bit address of a system microprocessor and providing the videotex processing means with the 8-bit address.
4. A unidirectional address buffer that buffers the 8-bit address.
Described text graphics processing videotex interface device. 5. A read / write signal processing means, which is provided between the system microprocessor and the videotex processing means and processes and interfaces a read signal and a write signal, is further configured. The text graphics processing videotex interface device according to claim 1. 6. The 8-bit address of the system microprocessor is connected to the 8-bit data bus of the videotex processing means through the data buffer and the address buffer.
Connected by bit address bus, select signal and interrupt signal of peripheral chip of system microprocessor,
The text graphics processing videotex interface device according to claim 4 or 5, wherein the preparation signal and the reset signal are connected to corresponding terminals of the videotex processing means. 7. A peripheral chip selection signal of the system microprocessor is connected to a chip enable signal of the videotex processing means to provide a graphic controller section, a serial communication interface section, respectively.
7. The text graphics processing videotex interface device according to claim 6, wherein a keyboard interface unit and a printer interface unit are selected. 8. An interrupt signal of the videotex processing means is output from a keyboard interface unit, and another interrupt signal of the videotex processing unit is detected by a serial communication interface unit to perform an interrupt operation. 7. The method according to claim 6, wherein
Described text graphics processing videotex interface device. 9. The preparation signal performs all the operations of the videotex processing means by delaying the processing speed of the videotex processing means, and then outputs a logic "1" signal to cause the system microprocessor to perform a unique operation. 7. The text graphics processing videotex interface device of claim 6, wherein the text graphics processing videotex interface device is configured to perform. 10. The text / graphics processing video according to claim 6, wherein the reset signal of the system microprocessor is generated at the moment when power is supplied to the videotex terminal to initialize the videotex processing means. Tex interface device.