JPS6010949A - Serial transmission data advanced processing system - Google Patents

Abstract

PURPOSE:To attain a character processing control having a margin by executing the control relating to the character processing in advance when a data reaches a bit which can identify sufficiently what character the data is, among serial bits constituting a character to be transmitted. CONSTITUTION:When the 7th bit b7 of a character data 14 is received, a processing request is generated, then the processing request detection, the index processing processing 11'' of the character table, a loading processing of a character processing program (loading to a line processor memory)12'', running 13'' of character processing program are executed. As a result, a margin time T2 is increased than a conventional device and omitted words are decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to advance control when receiving serially transmitted data in a start-stop synchronization system in a communication control device, a data home device, or the like.

(2) Prior art and problems Figure 1 is a diagram for explaining serial transmission data using the start-stop synchronization method, where 2 is the data waveform, L is the data length of one character, and 3 is the start of operation of the synchronous circuit. 4 indicates the information selection pulse, 5 indicates the synchronous circuit operation stop timing, 6 indicates the synchronous circuit operation start timing for receiving the next character data, ST indicates the start pit, b1 to b7
are data bits, P is a parity pit, and SP is a stop bit.

The characters in Figure 1 indicate the case of even parity of 7 bits of %OO101 (11). Figure 2 is a diagram showing how character data is continuously sent on the transmission line. , 7 is the data flow, and 8 to 10 are each character data.

11 to 13 each represent the processing related to the received character, and L is the data length of one character as in FIG.

In FIG. 2, when character 8 (from the ST bit to the SP bit) is received, the previously received character 8 is processed while each bit of the character is being received. That is, processing request detection and character table index processing 11, character processing program loading processing 12,
Runs 13 of the character processing program 2 are executed one after another.

In such a conventional processing method, after confirming that all bits of a received character have been correctly received, processing begins, but the first received character (for example, the second
If the processing of all previously received characters (in this case, 8 in Figure 2) is not completed before the processing request 9) in the figure is sent, the processing request will not be accepted and the data will not be processed. Since it is not possible to include characters, omissions occur. As a result, it was necessary to provide a buffer for each line to prepare for temporary load concentration, and to use a processor with a high processing speed, which led to an increase in the amount of hardware and was detrimental to economic efficiency.

(3) Purpose of the Invention In view of the above-mentioned conventional problems, the present invention provides a processing method that allows for flexible control without increasing the amount of hardware or using a particularly fast processor. It is intended to.

(4) Structure and object of the invention According to the present invention, as described in the claims, in the reception of serial transmission data by the start-stop synchronization method, the data is When enough pit salt has arrived to identify whether the character is a ``sensor'' character, it is assumed that the bits that are expected to arrive later and the data when the bit is added are normal, and the data is detected in advance. This is achieved by a serial transmission data advance processing method characterized by starting control related to character processing.

(5) Embodiment of the invention] FIG. 5 is a diagram for explaining one embodiment of the present invention, where 7 is the same data flow as in FIG. Processing related to received characters, 11 “～
15'' represents processing related to received characters according to the present invention, and 14 and 15 represent character data.

In FIG. 3, in the conventional method, when character data 14 is received, a processing request is issued after the stop bit SP arrives, and the processing request is detected, the character table indexing process 11', and the character processing program is executed. Loading process (
Loading into the memory of the line processor) 12ζ character processing program running 13', etc. were being executed. In the method of the present invention, when the b7th bit of character data 14 is received, by issuing a processing request, processing related to character data 14 can be performed in advance without checking the parity bit P1 stop bit SP that will be received subsequently. 11" to 13". Character data can be identified by the b1 to b7 pits, and generally there is no time required for reprocessing when a parity error or stop bit error occurs. The loss is negligible.

Regarding the time from the end of running a processing program for a certain character to the timing at which processing for the next character must start, compared to T1 in the conventional case (see Fig. 3), in the method of the present invention, the time is T2. It will grow as shown (
In this example, the time required to receive 2 bits increases). This time T1 or T2 is a margin time,
In the present invention, since this time can be increased, the ability to adjust the time when an error occurs during reception or when loads are concentrated is expanded and improved.

Depending on the character code system, when there is no parity bit and the final bit (bit 7) is ``S'', it may indicate that the nuclear data is a message, but in the same way as above, there is no parity bit. It is possible to start processing immediately.

As explained above, according to the method of the present invention, in the reception of serially transmitted data using the start-stop synchronization method, by performing control related to character processing in advance, the processing time interval between received characters can be greatly adjusted. This eliminates the possibility of omitted characters due to delays in importing the next data. Moreover, it does not require a buffer or a processor with a high processing speed (it can be easily realized using conventional hardware), so the effect is great.

[Brief explanation of the drawing]

Fig. 1 is a diagram for explaining serial transmission data using the start-stop synchronization method, Fig. 2 is a diagram showing how character data is continuously sent on a transmission line, and Fig. 3 is a diagram for explaining serial transmission data using the start-stop synchronization method. It is a figure for explaining an example. 2... Data waveform, 3... Synchronous circuit operation start timing, 4... Information selection pulse, 5... Synchronous circuit operation stop timing, 6... Synchronization for receiving next character data Circuit operation start timing, 7...Data flow, 8.9.10...Character data, 11-1! ,1
1' to 13', 11" to 13"... Processing related to received characters 1st 2nd 3rd figure

Claims (1)

[Claims] When receiving serially transmitted data using the start-stop synchronization method, when enough bits have arrived to identify what kind of character the data is, among the serial bits that make up the character to be transmitted, A serial transmission data advance processing method characterized by starting control related to processing of the character in advance, assuming that the bit and the data when the bit is added are normal.