KR940002266B1 - Serial data and parrerel data auto-selecting processing system for laser beam printer - Google Patents

Abstract

The method processes both serially and parallelly transmitted data without loss or overlap of data. The system employing this method consists of: a serial port controller (11b) and a parallel receive unit (11a) to buffer input data and interrupts when pre-determined number of data bits are stored; a CPU (13) to read data from one port by received interrupt priority and generate a busy signal to the other port; a timer unit (15) to control data processing time to protect overlap.

Description

Automatic and parallel data automatic selection processing system and method such as LBP

1 is a block diagram of a conventional LBP serial and parallel data processing system.

2 is a signal flow diagram for the operation description of FIG.

3 is a block diagram of the automatic and parallel data automatic selection processing system of the LBP of the present invention.

4 is a signal flow diagram for the operation description of FIG.

* Explanation of symbols for main parts of the drawings

11: data receiving unit 13: central processing unit

14: Program ROM 15: Timer unit

16: raster image buffer unit 17: shistemram and data buffer unit

The present invention relates to data transmission of a laser beam printer (LBP) and the like, in particular, loss and mutual mixing of data generated when serial and parallel data are simultaneously transmitted in a terminal that supports serial and parallel data at the same time. The present invention relates to a serial and parallel data automatic selection processing system and method, such as LBP, which automatically processes parallel and serial data without using the same.

As shown in FIG. 1 of the attached laser beam printer, a serial and parallel data processing system of a conventional laser beam printer has a parallel connector 21 for interfacing parallel data transmitted from the outside and a parallel interfaced from the parallel connector 21. The parallel buffer unit 22 receives and buffers data through the data line, the serial connector 23 for interfacing the serial data transmitted from the outside, and the serial data input from the serial connector 23 through the data line. A line driver 24 for attenuating noise and interfacing, a serial / parallel data converter 25 for converting serial data interfaced from the line driver 24 into parallel data and generating an interrupt signal, and the parallel Program of the program ROM 27 in accordance with data and interrupt signals output from the buffer unit 22 and the serial / parallel data conversion unit 25. The central processing unit 26 to control the overall system operation, and the system RAM and data buffer for receiving and storing the user's desired data and serial and parallel data of the user output from the central processing unit 26 through the data line It is comprised by the part 28.

When the parallel data processing system of the conventional laser beam printer configured as described above receives parallel data and interrupt signals through the parallel connector 21, the parallel buffer unit 22 buffers the input parallel data and interrupt signals. Input to the central processing unit 26 through the data line and the control line (INT).

In addition, when serial data is input from the outside through the serial connector 23, the line driver 24 removes noise included in the serial data and inputs the serial / parallel data converter 25.

Since the serial / parallel data converter 25 converts the input serial data into parallel data and outputs the data through the data line, and no interrupt signal is input through the serial connector 23 and the line driver 24. When serial data is input through the line driver 24, an interrupt signal is generated to output an interrupt signal through the control line INT.

At this time, the central processing unit 26 scans the parallel buffer unit 22 and the serial / parallel data conversion unit 25, as shown in the signal flow diagram of FIG. The data of the parallel buffer 22 and the serial / parallel data converter 25 are sequentially read one by one, and are sequentially stored in the data buffer 28 regardless of the data type of the serial or parallel port. Will increase.

That is, when an interrupt signal is input from the parallel buffer unit 22, the central processing unit 26 reads the parallel data from the parallel buffer unit 22 by one byte and transmits the data to the data buffer unit 28 via the data line. Store and increase the address of the data buffer unit 28, and if an interrupt signal is generated from the serial / parallel data conversion unit 25, the central processing unit 26 at this point in time performs the serial / parallel data conversion unit 25. The parallel data is read by 1 byte and stored in the data buffer unit 28 via the data line, and the address is increased in the data buffer unit 28.

However, when the serial and parallel data processing systems of the conventional laser beam printers receive serial and parallel data at the time of system movement, serial data and parallel data are mixed and output processing occurs, or serial data is sent first and then parallelized. Even if the data was sent, the error of mixing the last page was inevitable.

In addition, there is a case in which only one port is selectively used among two serial and parallel ports, but this has an inconvenient problem of performing a mode conversion process each time a serial port and a parallel port are used.

Therefore, it is an object of the present invention to enable only a port in which serial and parallel data are first input in the initialization state of the printer, disable the remaining ports, and then interrupt the timer after a predetermined time by operating the timer unit after inputting both serial or parallel data. The printer automatically selects serial and parallel data at the same time by enabling both serial and parallel ports again at the corresponding interrupt to prevent data mixing and form feed. The last page without) is to provide LBP's direct and parallel automatic data processing system and method for automatic discharge after a certain period of time.

The object of the present invention as described above is a central control unit for controlling the operation of the printer and the entire system according to the data receiving unit for receiving the serial and parallel data transmitted externally, the serial interrupt signal generated from the data receiving unit and the parallel interrupt signal transmitted externally. A processing unit, a timer for driving an interrupt signal to the central processing unit after a predetermined time by driving according to the control signal of the central processing unit, and a raster image buffer for image-processing and outputting data of the central processing unit. According to the accompanying drawings, the present invention will be described in detail as follows.

3 is a block diagram of the automatic and parallel data automatic selection processing system of the present invention LBP. As shown therein, parallel data of an external host interfaced from the parallel connector 21 is buffered and output to the parallel reception buffer unit 11a. And a data receiver 11 for converting serial data interfaced from the serial connector 23 into parallel data in the serial I / O controller 11b and generating a parallel interrupt signal when a predetermined bit is stored, and the parallel connector 21. And outputting the enable signal according to the serial input / output controller 11b, with or without the serial interrupt signal, and reading data from the parallel receiving buffer unit 11a and the serial input / output controller 11b, and the serial and parallel connectors ( 23), by sending the call signal (BUSY) through the (21) to stop the data transmission of the external host and the printer according to the automatic selection processing program execution of the program ROM (14) A central processing unit (13) for controlling the overall operation of the system, and driven according to control data input from the central processing unit (13) via a data line to input an interrupt signal to the central processing unit (13) after a predetermined time. The timer unit 15 and the user's desired data output from the central processing unit 16 and serial and parallel data of the user's unit are sequentially received through a data line, and the stored data is stored in the central processing unit 13. System RAM and data buffer unit 17 for outputting through the raster image buffer unit for processing the image output from the central processing unit 13 and outputs to the engine side of the printer through the video logic unit 18 ( It consists of 16).

The automatic selection processing program is shown in FIG.

Here, the process includes an automatic selection processing initialization routine such as a, a serial interrupt routine of an automatic selection process such as (b), a character processing routine such as (c), and a timer interrupt routine such as (d).

The operation and effect of the present invention configured as described above will be described in detail with reference to FIG.

First, the central processing unit 13 initializes the parallel interrupt (PINT), the serial interrupt (SINT), and the timer unit 15.

In other words, both the parallel interrupt PINT and the serial interrupt SINT are enabled and the timer unit 15 is reset through the initial procedure and the routine as shown in FIG. 4A. Then set two constants, the global variable (Both) on the parallel and parallel ports.

When the initialization routine is completed as described above, while performing another task, parallel interrupt (PINT) of the external host is generated from the parallel connector 21 in the serial interrupt routine of the automatic selection process as shown in FIG. 4B, and the data receiver 11 is serialized. When the serial interrupt SINT is generated from the input / output controller 11b, the CPU 13 checks both ports. At this time, if two ports that are global variables are bosses with constant values, whether the parallel interrupt (PINT) generated from the parallel connector 21 or the serial interrupt (SINT) generated from the serial I / O controller 11b of the data receiver 11 is determined. If the serial interrupt (SINT) is checked, the parallel interrupt (PINT) is disabled and the variable port is serialized while the data signal from the external host is stopped by sending the call signal (BUSY) to the external host through the parallel connector (21). In case of parallel interrupt (PINT), disable serial interrupt (SINT) and transmit call signal (Busy) to external host through serial input / output controller (11b) and serial contactor (23). Set the variable port in parallel while stopping data transfer from the host.

After that, serial and parallel data input from the corresponding port is sequentially read, stored in the data buffer unit 11, and the timer unit 15 is reset.

That is, when the parallel interrupt (PINT) is generated from the parallel connector 21, the central processing unit 13 disables the serial interrupt (SlNT), sets the variable port in parallel, and the parallel receiving buffer unit 11a. ), The parallel data stored in the parallel receiving buffer section 11a is read one byte, and stored in the data buffer section 17 in sequence, and a serial interrupt (SINT) is received from the serial input / output controller 11b. When it occurs, the parallel interrupt (SINT) is disabled, the variable port is set in series, and the driving of the timer unit 15 stored in the serial I / O controller 11b is stopped.

The reason for stopping the timer unit 15 is to allow data to be input only at the other port and not receive the other port while either one of the two serial and parallel ports is enabled.

On the other hand, if data is stored in the data buffer unit 17 by the parallel interrupt routine of the automatic selection process of FIG. 4B, the central processing unit 13 performs the data buffer unit 17 through the character processing routine of FIG. 4C. After reading and interpreting the data stored in the sequential order to form the image in the raster image buffer unit 16 or performs the corresponding function.

At this time, in order to analyze the data stored in the data buffer unit 17, if there is no more data, first check the variable of the port to determine whether it is currently receiving data from one port or both ports If it is in the enabled state, that is, if the variable port is the same as the constant boss, it waits for input data. If the data is received from one port, the CPU 13 sets the timer 15 for 10 seconds. waiting.

Thereafter, if no data is input from the data receiving unit 11 until 10 seconds have elapsed from the timer unit 15, a 10-second interrupt (TINT) is generated from the timer unit 15, but if data is input within 10 seconds, as shown in FIG. 4B. In the parallel interrupt routine, the timer unit 15 is stopped again, and the data received from the data receiver 11 is analyzed through the same process as in FIG.

When the 10-second interrupt is generated from the timer unit 15, the CPU 13 lasers all data of one page amount stored in the raster image buffer unit 16 within the timer interrupt as shown in FIG. After transmitting to the engine on the beam printer side, the constant value boss is set in the global variable port and parallel interrupt (PINT) and serial interrupt (SINT) are enabled simultaneously.

As described in detail above, in the laser beam printer which can accommodate serial and parallel at the same time, not only the user can automatically select serial and parallel printing without setting, but also transmit data simultaneously from two hosts. When input data is processed without being mixed with each other, and the last page without form feed is automatically discharged after a certain time, the last page can be mixed to prevent the error of mixing the last page. There is an advantageous feature that can secure well.

Claims (5)

A data receiving unit 11 for buffering the serial input / output controller 11b and the parallel receiving buffer unit 11a when inputting direct and parallel data from an external host and generating a parallel interrupt signal when a predetermined bit is stored; and the data receiving unit 11 Outputs enable signal according to serial and parallel interrupt status of external host and reads the corresponding data and stops data input by sending BUSY to one host when interrupt occurs from one host. A central processing unit (13), a timer unit (15) which is driven by a control signal of the central processing unit (13), and controls a data processing time with a timer interrupt signal after a predetermined time; and the central processing unit (13) A data buffer 17 for storing the output data of the output data and outputting the stored data sequentially through the central processing unit 13, and through the central processing unit 13; Straight, such as a LBP, including the raster image buffer 16 to the image processing data to output to the engine side via the hollow weave portion 18 to the video, automatically selecting a parallel data processing system. The first process of initializing the serial and parallel reception status of the external host during printing, and reading the control and data of the counterpart for the corresponding interrupt when the serial and parallel interrupt (SINT) (PINT) is generated from the external host, and saving the data in the data buffer section. And a third process of sequentially reading and analyzing the character data stored by the second process, forming a corresponding image in the raster image buffer unit, and controlling a timer unit. In the event of timer interrupt after a certain time, the controller prints and prints one page worth of data stored in the raster image buffer to the engine and sets constant bosses on the serial and parallel ports of the variable. A method for automatic selection of serial and parallel data, such as LBP, comprising a fourth process of enabling PINT). The method of claim 2, wherein the first process comprises: a first step of enabling a serial host, a parallel interrupt (SINT) (PINT), a second step of resetting a timer unit, and a series of variables after the second step. Automatic parallel processing of LBP, etc., characterized in that the third step of setting a constant boss to the parallel port. The method of claim 2, wherein the second process includes inputting a fourth step of inputting a serial interrupt (SINT) (PINT) of an external host, and checking whether the parallel interrupt is a boss after the fourth step. A fifth step of checking for interrupts; a sixth step of disabling parallel interrupts and setting a port of a variable in series if the interrupt inputted in the fifth step is serial; and an interrupt input in the fifth step A seventh step of disabling the serial interrupt and setting the port of the variable; and an eighth step of reading the data of the port for the corresponding interrupt of the sixth and seventh steps, storing the data in the data buffer, and resetting the timer. Process for automatic selection of serial and parallel data, such as LBP. 3. The third process is a ninth step of reading out and analyzing problem data stored in the data buffer unit by the second process, and checking the data buffer unit data after the ninth step and continuing if there is data. If the character data is not interpreted and processed, the tenth step of checking whether the port is a boss or the tenth step if the port is not a boss in the tenth step and the eleventh step of setting a timer for a predetermined time if the boss Direct and parallel data automatic selection processing method such as LBP.