JPH0367678A - Line buffer switching device - Google Patents

Abstract

PURPOSE:To improve printing history control efficiency by providing a selector switch for reception and printing data history control on each line buffer and selecting between reception and printing data history control functions as soon as a single line printing is completed. CONSTITUTION:A line buffer set as a line buffer for reception by selecting changeover parts 6, 7 with a switch is placed in standby mode until the control processing of single line printing data is completed, if the line buffer is full of single line data. In the meantime, data in the remaining other three line buffers set for single line printing data history control is sent simultaneously to a printing data history control part 10. Thus this data together with preceding line data one line previously and line data two lines previously performs history control over line data currently under control. A switch selection control part 5 selects between the changeover part 6 and an address changeover part 7 using the single line buffer for the data two lines previously as a next line reception function and the remaining three line buffers as a printing data history control function when single line printing is completed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a line buffer switching device, and more specifically, a device for switching a plurality of line buffers in a printing device that prints print data sent from a host device, etc. The present invention relates to a line buffer switching device.

(Prior art) Conventionally, the line buffer 1 stores one line of received data, and after the reception is completed, the data is extracted from the line buffer as print data, and after printing is completed, new received data is stored in the line buffer. It was composed of Furthermore, even if it had a plurality of line buffers, all of them functioned only as line buffers for reception.

[Problems to be Solved by the Invention] In the conventional example as described above, the line buffer is used only to store print data for reception, and therefore has the following drawbacks.

- As soon as the printing of the received data ends, the line buffer becomes the reception buffer for the next line, so the received data does not remain as print control data for history correction.

■ Multiple line buffers cannot be accessed simultaneously for reception and print control.

An object of the present invention is to eliminate the above-mentioned drawbacks, and to make it possible to access other line buffers for print control while receiving one line data, and to use the received data as print control data for history correction. An object of the present invention is to provide a line buffer switching device that enables line buffer switching.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a line buffer switching device for a printing device having a plurality of line buffers, in which a reception changeover switch is provided for each of the plurality of line buffers. and a changeover switch for print data history control, and when one line buffer set for reception among the line buffers is receiving one line data, the remaining line buffers are set for print data history control. The present invention is characterized in that it includes a switch changeover control unit that sequentially controls each changeover switch so that the use for reception and the use for print data history control are switched at the same time as printing of one line is completed.

[Function] In the present invention, each of the plurality of line buffers is provided with a changeover switch for reception and print data history control, and when one line buffer is receiving one line data, the other line buffers are It works for print data history control, and for reception at the same time as printing of one line is completed.
Since the print data history control function can be switched, the efficiency of print history control can be easily improved, and even if the transfer speed of data reception increases, processing can be performed in a short time, so the print speed can be increased. It also leads to improvement.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a circuit configuration of an embodiment of the present invention.

In the figure, 1 to 4 are one-line buffers (R) that store received data or print control data, respectively.
AM), and 5 is a switch control unit that individually switches each of the line buffers 1 to 4 to be used for storing received data or for controlling print data history. 6 is a data switching unit that switches between writing data into the line buffer for each line buffer 1 to 4 or retrieving print history control data from the line buffer; 7 is a data switching unit for each line buffer 1 to 4; This is an address switching unit that switches between a buffer's write address and read address. 8 is a reception address generator that sets the reception data write address;
Reference numeral 9 denotes a sending address generator that sets a sending address when sending data from the line buffers 1 to 4 to the print data history control section. Reference numeral 10 represents a print data history control unit that controls the history of print data, and 11 represents data received from the host device.

In the above configuration, the switch switching control unit 5 switches one of the line buffers 1 to 4 for reception from an external host device (not shown), and switches the remaining three for print data history control. are set, and the reception address switch and transmission address switch of the data switching unit 6 and address switching unit 7 are respectively switched.

The received data at this time is the print data of the next line,
The data of the line to be actually printed is already stored in another line buffer. The data in the print data history control buffer, which is another line buffer, is the data of the line to be printed currently, the data of one line before, and the data of two lines before.

After the switch switching control unit 5 switches the above-mentioned switches, initial settings of the reception address and transmission address are performed, and the reception address is incremented for each data received from the host device, and the data is sent to the print data control unit. The address generator 8.9 increments the transmission address each time the transmission is made. Switching section 6
．． When the line buffer set as the receiving line buffer by switching the switch in step 7 becomes full, it remains on standby until the one-line print data control process is completed.

On the other hand, the remaining three line buffers set for 1-line print data history control are simultaneously sent to the print data history control unit IO, and are currently controlled together with the previous line data from 1 line before and the line data from 2 lines before. History control is performed on the data of the line to be used.

When one line of printing is completed, the switch switching control section 5 uses the one line buffer of the previous line for receiving the next line, and uses the remaining three line buffers for controlling the print data history, using the data switching section 6 and the address switching section 7. Change the switch.

As described above, according to the embodiment of the present invention, a plurality of line buffers can be shared as reception buffers and print data history control buffers, and since switching is performed for each line, all line buffers are always used for reception. It works very efficiently for controlling print data history.

[Effects of the Invention] As explained above, according to the present invention, each of the plurality of line buffers is provided with a switch for receiving and for controlling print data history, and a certain line buffer receives one line of data. The other line buffers function as print data history control while one line is being printed, and the functions are switched between receiving and print data history control as soon as one line is printed, making it easy to improve the efficiency of print history control. Even if the transfer speed of data reception is increased, processing can be performed in a short time, resulting in an effect that leads to an increase in printing speed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the circuit configuration of an embodiment of the present invention. 1 to 4... Line buffer, 5... Switch switching control section, 6... Data switching section, 7... Address switching section, 8... Reception address generator, 9... Transmission address generator, 10...Print data history control unit. Figure 1

Claims (1)

[Scope of Claims] A line buffer switching device for a printing device having a plurality of line buffers, comprising: a reception changeover switch and a print data history control changeover switch provided in each of the plurality of line buffers; When one line buffer set for reception among the buffers is receiving one line of data, the remaining line buffers work for controlling the print data history, and at the same time when printing of one line is finished, it is set for reception and printing. 1. A line buffer switching device comprising: a switch switching control section that sequentially controls switching of each of the switching switches so that data history control is switched.