JP2783034B2 - Live connection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a live connection system for connecting a terminal to a live connection, and more particularly to a live connection system for a bus configuration for multiplexing fixed length data.

[0002]

2. Description of the Related Art In a conventional hot-line connection system, a connection is made so as not to access a bus with a gate closed so as not to affect data transmission from another terminal as much as possible.

[0003]

In the conventional hot-line connection method, even if a connection is made so as not to access the bus, some effects such as stopping data transmission of a terminal performing data transmission are caused. There was a problem that it might come out.

[0004]

According to a first aspect of the present invention, there is provided a live connection system in which a bus to which at least one terminal is connected is time-divided into a predetermined period, and a terminal required for each period includes a data including an error correction code. In a device for multiplexing by transmitting data while competing between the terminals, wherein the bus has at least one data line and one wired O
Using an R-connection contention control signal line, a synchronization signal line indicating a cycle timing, and a clock line indicating a transfer clock,
The terminal transmits a binary terminal number given in advance to the contention control signal line one bit at a time in synchronization with a clock, and compares the transmitted signal with a signal on the contention control signal line. If a mismatch occurs, the terminal immediately stops transmitting the terminal number, and if it matches, transmits the terminal number as it is, and if the match is made to the end, the terminal has a bus configuration that outputs data in the next cycle, The terminal has a data transmission terminal number assigned to each terminal such that the last bit transmitted to the contention control signal line is "0", and a live line connection terminal number set to all "1". When a live connection is made, the terminal number for the live connection is transmitted to the contention control signal line to acquire the right to use the bus, and then the connection is established. After the connection is completed, the terminal number is switched to the data transmission terminal number. The features.

In the hot-line connection method according to a second aspect of the present invention, a bus connecting at least one terminal is time-divided into a fixed period, and a terminal necessary for each period exchanges data including an error correction code with each other. A hot-line connection method in a device for multiplexing by transmitting while taking the
The terminal is a binary terminal provided in advance by using one data line, one conflict control signal line of wired AND connection, a synchronization signal line indicating a cycle timing, and a clock line indicating a transfer clock. A number is transmitted to the contention control signal line one bit at a time in synchronization with a clock, and the transmitted signal is compared with a signal on the contention control signal line. The transmission of the number is stopped, and if the numbers match, the terminal number is transmitted as it is, and if the numbers match up to the end, the terminal takes a bus configuration to output data in the next cycle, and the terminal transmits the data to the contention control signal line. A terminal number for data transmission assigned to each terminal such that the last bit to be set to "1" and a terminal number for live connection set to all "0" are prepared. And it switches the active line connection terminal number to the conflict control and transmitted to the signal line connecting from acquires bus use right this connection completion after the data transmission terminal number.

[0006]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of a hot-line connection system according to the present invention, in which one or more terminals 11 and 13 are connected on a bus, and the bus is time-divided into a fixed period so that terminals required for each period Shows a case where a certain terminal 12 is connected to an apparatus that multiplexes data by transmitting data while competing between the terminals.

A terminal 11 is connected to a bus constituted by a data line 1, a conflict control signal line 2 of one wired OR connection, a synchronization signal line 3 representing a cycle timing, and a clock line 4 representing a transfer clock. 13 is connected.
Each of the terminals 11 to 13 has a data holding means (hereinafter referred to as DAT) for holding transmission data and a terminal number unique to the terminal (the last bit transmitted so that the connected terminal has priority is "0").
To ) Holding the terminal number holding means No. 1 (hereinafter referred to as TNA) and the terminal number for hot-line connection “111” at the time of terminal connection.
1 "which is set and held by the terminal number holding means No. 1 2 (hereinafter referred to as TNB), DAT is connected to the data line 1 of the bus, and TNA and TNB are connected to the conflict control signal line 3 of the bus. If there is transmission data in the terminal, the terminal transmits its own terminal number to the contention control signal line 3 and compares the signal on the contention control signal line 3 with the terminal number transmitted by the terminal using a comparing means (hereinafter referred to as CMP). Then, data can be transmitted to the data line 1 of the bus only when they match. A terminal 12 is connected to a bus configuration having such features. First, the terminal number of the terminal 12 to be connected is set from the data transmission terminal number to the live line connection terminal number “1111”. After that, only the competition control signal line 3 is connected,
The competition of the terminal numbers as described above is performed, and the connection to the other synchronization signal line 3, clock line 4, and data line 1 is performed in a state where the terminal 12 to be connected has priority. At this time, since the terminal 12 itself accesses the bus, no data is erroneously transmitted due to the detection of the error correction code. After connection, the terminal number "11
The terminal number of "11" is switched to the original data transmission terminal number.

FIG. 2 is a block diagram of a specific example of the connection section between the terminal and the bus in FIG. As shown in FIG. 2, the terminal of the connector 16 on the terminal side connected to the competition control signal line 2 is connected before the other lines using long pins. The other three lines are connected after the contention control signal line 2 is connected and the contention of the terminal numbers ends and the priority is given.

The operation when three terminals A, B, and C want to transmit will now be described with reference to FIG. FIG. 3 is a diagram showing a state of a signal transmitted by each terminal and a signal on a contention control signal line in the embodiment shown in FIG.

It is assumed that the terminal numbers for data transmission are "abcd" for terminal A, "efgh" for terminal B, and "ijjkl" for terminal C (d = h = 1/0). When a certain synchronization signal rises, the first bit of the terminal number, that is, terminal A receives signal a, terminal B receives signal e, and terminal C receives signal i at the rise of the clock following the clock that has risen simultaneously with the synchronization signal. The signal is transmitted to the contention control signal line 2. At this time, the signal m on the competition control signal line 2 is an OR of a, e, and i.
The transmitted signals a, e, and i are compared with the signal m on the competition control signal line 2 by CMP. For example, if the signals a and m do not match, the terminal A does not transmit the signal bcb but transmits "0" from the rising of the next clock until the next synchronization signal is input. The coincident terminals B and C transmit the second bit of the terminal number to the competing bus at the next rising edge of the clock, and compare them in the same manner as the first bit. In this way, the terminal that has been compared up to the fourth bit and has reached the end can transmit the data contained in the DAT to the data line 1 at the rise of the next synchronization signal.

FIG. 4 is a diagram for explaining the case where the terminal Z is connected to the bus configuration in which the terminals A, B and C are connected in FIG. At this time, the terminal number “VW
"XY" is always the priority, so that the terminal number "1"
111 ”(normal terminal number is“ 1111 ”
Is not given).

As shown in FIG. 4, a case is considered in which terminal Z is connected when contention for the second bit of the terminal number is being performed. At this time, as described above, the competition of the terminal numbers is performed, and the terminal Z is finally given priority. Thus, connection is made while accessing the bus. At this time, since the other terminals become inconsistent during the competition, they cannot transmit data and do not access the bus.

Next, the operation when specific numbers are given in the example shown in FIG. 4 will be described with reference to FIGS. FIG. 5 is a diagram showing a state of a transmission signal from each terminal and a signal on a contention control signal line given specific terminal numbers to the terminals in FIG. 4, and FIG. 6 shows terminals A,
FIG. 6 is a diagram showing the contention control signal lines and data lines when terminal Z is connected when B and C want to transmit.

The terminal number for data transmission of each terminal is "0010" for terminal A, "1010" for terminal B, and terminal C for terminal C, respectively.
Is "1100" and terminal Z is "0110" (the least significant bit of the terminal number is "0"). Each terminal sets the first bit of the terminal number to “0”, terminal B to “1”, terminal B to “1” and terminal C to “1” at the rising edge of the clock following the clock that has risen simultaneously with the synchronization signal in this cycle. To the competition control signal line 2. At this time, the signal on the conflict control signal line of the wired OR connection takes OR of 0, 1, and 1 and becomes "1". In the CMP of the terminal A, the transmitted "0" is compared with the "1" on the contention control signal line 2 and they are inconsistent. Therefore, the terminal A does not transmit the remaining number "010" and starts from the next rising edge of the clock. "0" is transmitted until the synchronizing signal is received. For the terminals B and C, the signal on the contention control signal line 2 is "1" with respect to the transmitted signal "1".
Therefore, the terminal B sets the second bit of the terminal number to “0” at the rising edge of the next clock.
The terminal C transmits "1" to the contention control signal line. Terminal A transmits “0”. At this time, the signal on the competition control signal line 2 is ORed with 0, 0, 1 and becomes "1". Since the CMP of terminal B compares "0" transmitted from terminal B with signal "1" on contention control signal line 2 and does not match, terminal B does not transmit the remaining number "10" and receives the next clock. "0" is transmitted from the rise of the signal until the next synchronization signal is input. It is assumed that the terminal Z is connected when this conflict is occurring. At this time, the terminal number of the terminal Z is switched to the terminal number “1111” for live connection (see FIG. 5). Since the signal on the contention control signal line 2 is also "1" and coincides with the transmitted signal "1", the terminal C sets the third bit "0" of the terminal number to "0" in accordance with the next clock. Send to At this time, since the terminal Z participates in the contention and the terminal Z transmits "1", the contention on the contention control signal line 2 becomes "1". Therefore, the terminal C does not match, and transmits “0” from the next cycle. Similarly, for the next bit, the terminal Z sends "1" to the contention control signal line 2, and the signal on the contention control signal line 2 also becomes "1" and matches. In this way, the terminal Z that has matched up to the end transmits the data in the DAT in the next cycle to the data line 1.
Are connected in a state where transmission is possible, that is, a priority state. At this time, since the connected terminal Z accesses the bus, even if there is any bad influence, it can be surely checked by the error correction code. After the connection, the terminal number of the terminal Z is switched from the live-line connection terminal number “1111” to the original data transmission terminal number “0110”.

In the above embodiment, the wired OR
The case where the contention control signal line of the connection is used has been described. However, the contention control signal line of the wired AND connection may be used. "Is sent. In addition, when a conflict control signal line of a wired AND connection is used,
The terminal with the smaller terminal number has priority. Therefore, the terminal number for the live line connection of the terminal Z to be connected is “0000”.

[0016]

As described above, according to the present invention, since the connecting terminal accesses the bus by itself and other terminals cannot access the bus, even if any influence occurs, it is checked by the error correction code. This has the effect that the effect can be reliably eliminated, such as by stopping data transmission.

[Brief description of the drawings]

FIG. 1 is a block diagram of one embodiment of a live connection system of the present invention.

FIG. 2 is a configuration diagram of a specific example of a connection section between a terminal and a bus in FIG. 1;

FIG. 3 is a diagram showing a state of a signal transmitted by each terminal and a signal on a contention control signal line in the embodiment shown in FIG. 1;

FIG. 4 is a diagram for explaining a case where a terminal Z is connected to a bus configuration in which terminals A, B, and C are connected in FIG. 3;

5 is a diagram showing a state of a transmission signal from each terminal and a signal on a contention control signal line by giving a specific terminal number to the terminal in FIG. 4;

6 is a diagram showing a state of a contention control signal line and a data line when a terminal Z is connected when terminals A, B, and C want to transmit within one cycle in FIG. 4;

[Explanation of symbols]

 1 Data line 2 Competition control signal line 3 Synchronization signal line 4 Clock line 11, １３13, A, B, C, Z terminal 14, １９19 Connector CMP comparison means DAT data holding means TNA terminal number holding means No. 1 TNB terminal number holding means No. 2

Claims (2)

(57) [Claims] 1. A bus to which at least one terminal is connected is time-divided into a fixed period, and each terminal multiplexes by transmitting data including an error correction code in each period while competing between the terminals. A hot-line connection method in an apparatus, wherein the bus includes at least one data line, one contention control signal line of a wired OR connection, a synchronization signal line indicating a cycle timing, and a clock line indicating a transfer clock. And the terminal transmits a binary terminal number given in advance to the contention control signal line one bit at a time in synchronization with a clock to the contention control signal line, and transmits the transmitted signal and the signal on the contention control signal line. The terminal stops transmitting the terminal number immediately when a mismatch occurs, and transmits the terminal number as it is when the terminal number matches. The terminal has a bus configuration for outputting data in a cycle, and the terminal has a data transmission terminal number assigned to each terminal such that the last bit transmitted to the contention control signal line is "0", and all "1". The hot-line connection terminal number set to "" is prepared, and at the time of the hot-line connection, the hot-line connection terminal number is transmitted to the contention control signal line to acquire the right to use the bus, and then the connection is completed. A live line connection method characterized by switching to the data transmission terminal number afterwards. 2. A bus to which at least one terminal is connected is time-division-divided into a fixed period, and a necessary terminal is multiplexed by transmitting data including an error correction code in each period while competing between the terminals. A hot-line connection method in an apparatus, wherein the bus includes at least one data line, one contention control signal line for wired AND connection, a synchronization signal line indicating a timing of a cycle, and a clock line indicating a transfer clock. And the terminal transmits a binary terminal number given in advance to the contention control signal line one bit at a time in synchronization with a clock to the contention control signal line, and transmits the transmitted signal and the signal on the contention control signal line. The terminal stops transmitting the terminal number immediately when a mismatch occurs, and transmits the terminal number as it is when the terminal numbers match. And a data transmission terminal number assigned to each terminal such that the last bit transmitted to the contention control signal line is "1". A hot-line connection terminal number set to "0" is prepared, and at the time of the hot-line connection, the hot-line connection terminal number is transmitted to the contention control signal line to acquire the right to use the bus. A hot-line connection method, wherein the terminal number is switched to the data transmission terminal number after completion.