JPS63287130A - Data mutual transfer system - Google Patents

Abstract

PURPOSE:To attain efficient data transfer between microcomputers by transferring the data again only when a data error is generated in a reception data and applying data transfer with priority when a reception side requests a data. CONSTITUTION:An error check means 2 of a receiver side microcomputer A checks a code error of the input data transferred from the outgoing side microcomputer B and when an error exists, the operation of the data processing means 3 is blocked. Then a retransmission request data from a retransmission request means 2c and an request ID data outputted from a request ID data generating means 4 are sent to the outgoing microcomputer B. A transmission data generating means 15 in the outgoing microcomputer B generates the data again corresponding to said request ID data and adds an error detection data and sends it to the receiver side microcomputer A again. When the receiver side processing means 3 requests a special data urgently, the corresponding ID data is sent from the ID data generating means 4. The outgoing side B receiving the ID data transfers the data corresponding to the ID to the receiver A with priority.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application The present invention relates to a data mutual transfer system for mutually transferring data between microcomputers.

(b) Prior Art When electronic equipment is controlled by a microcomputer, it is difficult to perform complex control with a single microcomputer, and conventionally a plurality of microcomputers are often employed. For example, Utility Model Publication No. 61-1470 (
GO6F 15102) discloses a technique in which mutual data transfer is facilitated by making the oscillation outputs of a plurality of microcomputers common and driving the microcomputers synchronously. Furthermore, regarding the configuration for transferring data through one transmission path, Japanese Patent Laid-Open No. 61-280124 (HO4B1/1
Problems to be solved by the l/i invention shown in 6) However, if the above-mentioned conventional technology is adopted as is, data transfer between microcomputers cannot be performed efficiently and quickly. In order to prevent data latch errors, the transmitting microcomputer often transfers data multiple times regardless of whether or not a latch error occurs. Further, the transfer order of the transfer data is uniformly determined by the program of the oscillating microcomputer, and the configuration is not such that the data most needed by the receiving microcomputer can be efficiently transferred.

According to the present invention, the receiving microcomputer is equipped with a data processing means (3), an error checking means (2), a request ID data generation means (4), and a transfer data generation means (4). 6
), and the oscillation side microcomputer is provided with a sending data forming means (5) and an error detection data adding means Qη.

(e) Data is retransmitted from the transmitting microcomputer only for the purpose of operation, and data requested by the receiving microcomputer is preferentially transferred from the oscillating microcomputer.

(f) Example Hereinafter, the present invention will be explained according to an illustrative embodiment.

In this embodiment, the present invention is adopted when a timer microcomputer in a video tape recorder is connected to a system controller microcomputer, and FIG. 1 shows a circuit block diagram in which the inside of the microcomputer is divided into functional blocks. .

Hereinafter, we will explain the operation when the F1 system microcomputer (A) is on the receiving side, the timer microcomputer (B) is on the oscillating side.

First, the information unit to be serially transferred consists of 4 blocks as shown in FIG. 2, and each block consists of 8 bits. The leading 4 bits of the first block are ID (identification) data, and the remaining 5 bits of the fourth block are 1 bit.
t of retransmission request data and 4 bits of error detection data are allocated, and the remaining 23 bits are allocated to actual data.

When such data is input to the receiving microcomputer (A) via one transmission line, the data latch means (1) first latches the 32-bit data. When the data is correctly latched, the data processing means (3) also inputs the latched data and processes the data. On the other hand, the receiving side microcomputer (transmission data forming means within ~)
5), the sending data generating means (5) generates data based on the ID data specified by the sending ID specifying means (5a) in a predetermined order.
a) forms the corresponding data, and data corresponding to the ID data is formed and derived as sending data. This output data is serially transferred via one transmission line as data necessary for data processing by the transmitting microcomputer (B). Therefore, both microcomputers (A) and (B) operate by transferring data to each other.

In the above-described configuration, if the data latch means (1) fails to launch data correctly, the error check means (21) operates and first detects the provision of ID data.
Error detection means (2a) or data error detection means (2b) for detecting errors in the entire data based on error detection data
), an error detection output is generated from either or both.

The data latch means (1) is reset by this error detection output, and an output is issued from the retransmission request means (2c). The transfer data generation means (6) that inputs this output is
Set the retransmission request data following the transmitted data to high level (
change. The error detection data addition means (7) adds 4-bit error detection data to the output of the transfer data generation means (6) and serially transfers it to the originating microcomputer (B).

In the oscillation side microcomputer (B), when the data latch means αυ correctly latches this data, the data processing means uJ processes the ID data and the data, and the retransmission request data is latched by the retransmission request data latch means (15c). When this retransmission request data is latched, the sending ID designating means (15a) re-designates the ID data.

As a result, the sending data generating means (15b) outputs the ID
Data corresponding to the data is re-formed and derived, and the same data is again serially transferred from the oscillating microcomputer (B) to the receiving microcomputer (A).

The retransfer described above is performed until the data latch means (1) correctly latches the data, and is also performed with priority to the transfer of request ID data, which will be described later.

Further, when the data processing means (3) requests special data to be received immediately from the sending microcomputer (B), the request ID data generating means (4) generates request ID data corresponding to the special data. is derived. On the condition that the output of the retransmission requesting means (2c) is not input, the transfer data generating means (6) prevents the derivation of the sending data and generates 4 bits of special ID data and the request ID.
Generate f-94 bits and 20 bits of empty information. The error detection data adding means (7) adds 4 bis to this output.
Serial transfer is performed by adding t error detection data.

When the data is latched correctly in the oscillating microcomputer (B), the request ID data input detection means (15c) detects the special ID data, and the request ID data latch means (15e) detects the subsequent request ID data. Latch. When this request ID data is latched, the sending ID designating means (15a) preferentially designates the request ID data as sending ID data. As a result, data corresponding to the request ID data is derived from the sending data forming means (2).

The data processing means (3) immediately inputs and processes the necessary data.

As mentioned above, the receiving microcomputer (A) issues a data retransfer command or a specific data transfer command to the transmitting microcomputer (B), but both microcomputers (A) ( It is clear that both of B) are equipped with station components and that instructions can be given from the transmitting side to the receiving side, so a detailed explanation will be omitted.

FIG. 3 is a flowchart for explaining the operation of the receiving microcomputer (A), and each block corresponds to the number of the functional block in FIG. 1. As is clear from FIG. 3, when the data latch means (1) first latches the data, the ID error detection means (2a) detects an ID error. When an ID error is detected, latch data is generated and set, data processing is performed without inputting the latch data, and retransmission request data is added to the transmission data generated by the transmission data generation circuit (5b).
This error detection data is added and serially transferred.

If no ID error is detected, the data error detection means (2b) performs an error detection operation on the latch data and executes data error detection. As a result, when a data error is detected, the same processing as when an ID error occurs is performed. When the data is latched without any data error being detected, the retransmission request data latch means (1SC) detects the retransmission request data.

When retransmission request data is detected, the data processing means (3) that has read the latch data processes the data and sends the sending ID.
The specifying means (5a) specifies the same ID data as the previously transferred data, the sending data generating means (5b) forms the same data again, and the error detection data adding means (7) adds error detection data. , performing a serial transfer. If retransmission request data is not detected, the request ID data input detection means (5d) detects the request ID data. When the request ID data is detected, the request ID data latch means (3) latches the request ID data, the data processing means performs data processing without inputting the latch data, and the sending ID specifying means (5a) By specifying the request ID data, the sending data generating means (5b) forms request data and adds the latched request ID data to derive the sending data, and the error detection data adding means (7) generates the error detection data. is added to perform serial transfer. If the request ID data is not detected, the data processing means (3i) reads the latch data and performs data processing. When the data processing is on the verge and special data is urgently needed, the request ID data generation means (4) assigns special data to the ID data, multiplexes the requested ID data in the data area, and the error detection data addition means (7) adds the error detection data and performs serial transfer.Special data is required for data processing. If not, request ID data is not formed, and the sending ID specifying means (5a) specifies the next ID specified, and the sending data generating means (5b) forms and derives data corresponding to the ID data, and eliminates the error. A detection data addition means (7) adds error detection data to the transmitted data and performs serial transfer.

The above operating procedure is performed by the sending microcomputer (B).
The same applies to

(g) Effects of the Invention According to the present invention, data is retransmitted only when a data error occurs in the received data, and even if the receiving side particularly needs data, it can be input immediately, which is ideal. data transfer is realized.

[BRIEF DESCRIPTION OF THE DRAWINGS] Each figure shows an embodiment of the present invention, and FIG. 1 is a functional block diagram, FIG. 2 is a diagram explaining the transfer signal arrangement, and FIG. 3 is a diagram explaining the operation procedure. Was. (11...data latch means, (2)...error check means, (5)...transmission data forming means, (A)
... Receiving side microcomputer, (B)... Sending side microcomputer.

Claims (1)

[Claims] (1) In a microcomputer that transfers data alternately between microcomputers, the receiving microcomputer includes a data processing means (3) for processing input data and a means for detecting code errors in the input data. error checking means (2) for blocking processing operations of the data processing means and generating retransmission request data; and request ID data generation means (4) for generating request ID data corresponding to data requested by the data processing means. ) and a transfer data generating means (6) for deriving the retransmission request data and the request ID data as output data, the sender microcomputer detects the input of the request ID data and generates the request ID data. Sending data forming means (15) that forms data corresponding to the data and detects input of the retransmission request data to form previously sent data;
A data mutual transfer system characterized by comprising: error detection data adding means (17) for forming and deriving the input data by adding error detection data to the data derived from the sending data forming means.