JPH0661050B2 - Apparatus unit control method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to operation setting information from a central processing unit in a single device via a common bus to individual units connected to this common bus. The present invention is used for an in-device unit control method and device for controlling transmission.

〔Overview〕

The present invention relates to an in-apparatus unit control method for performing control of transmitting operation setting information from a central processing unit via a common bus to an individual unit connected to this common bus in one device, wherein the central processing unit When sending the transmission information to the individual unit, it sends a control signal that makes the individual unit receivable by a control signal line provided separately from the common bus, and the individual unit makes it receivable by this control signal and operates By receiving the setting information, malfunctions due to the insertion and removal of the unit are prevented.

[Conventional technology]

FIG. 3 is a block diagram showing an example of an apparatus according to a conventional unit control method in the apparatus.

The central processing unit 10 and the n individual units 20 are respectively connected by a common bus 30, the central processing unit 10 includes a bus interface circuit 11, and the individual units 20 include a bus interface circuit 21 and an error correction circuit 22, respectively. There is.

[Problems to be solved by the invention]

In the above-described conventional apparatus unit control method, the central processing unit 10 and each individual unit 20 are simply connected to each other via the bus interface circuits 11 and 21. The insertion and removal of one individual unit 20 has a drawback that the other individual unit 20 or the central processing unit 10 is affected, and a malfunction is likely to occur.

An object of the present invention is to provide a method and apparatus for controlling an in-apparatus unit by eliminating the above-mentioned drawbacks and preventing other units from malfunctioning due to insertion / extraction of an operating unit connected to a common bus. is there.

[Means for solving problems]

The apparatus unit control method of the present invention, in one device,
In the in-apparatus unit control method for controlling transmission of transmission information from a central processing unit via a common bus to a plurality of individual units connected to the common bus, the central processing unit is configured to transmit the transmission information. A control signal for setting the individual unit in a receivable state is transmitted by a control signal line different from the common bus, and the individual unit is set in a receivable state by the control signal and receives the transmission information. To do.

The apparatus of the present invention is an apparatus including a central processing unit and a plurality of individual units connected to the central processing unit via a common bus, wherein the central processing unit is
The individual unit includes a control signal generating unit that generates a control signal for controlling the transmission information to a receivable state, and the individual unit includes a control unit that sets the unit to a receivable state when the control signal is received. , A control signal line different from the common bus connecting between the central processing unit and the individual unit for transmitting the control signal from the central processing unit to the individual unit.

Further, in the apparatus of the present invention, the individual unit may include holding means for holding the signal level of the connected control signal line at a predetermined level.

[Action]

At the time of transmission, the control signal is transmitted from the central processing unit via the control signal line. This is, for example, the control signal line “H”
The level is set so that each individual unit is initialized and receives the transmission information.

Therefore, even if a certain individual unit in operation is inserted / removed and the transmission information on the common bus is disturbed by noise, it can be operated properly by subsequent retransmission. When the central processing unit is inserted or removed, each individual unit holds the level of the control signal line at "H" by the holding circuit. As a result, each individual unit is initialized and no malfunction occurs.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an apparatus according to the in-apparatus unit control method of the present invention.

In this embodiment, a central processing unit 10 including a bus interface circuit 11 and n individual units each including a bus interface circuit 21 and an error correction circuit 22 connected to the central processing unit 10 via a common bus 30. In the device provided with 20, the central processing unit 10, which is a feature of the present invention, is a control signal as a control signal generating means for generating a control signal 13 for controlling the individual unit 20 to a state in which transmission information can be received. The generation unit 12 is included, and the individual unit 20 includes control means 21a for setting the individual unit 20 in a receivable state when the control signal 13 is received in the bus interface circuit 21 thereof. Individual unit 20
Central processing unit 10 and each individual unit for transmission to
The individual unit 20 further includes a control signal line 13a connected between the two, and the individual unit 20 further includes a pull-up circuit 23 as a holding means for holding the signal level of the connected control signal line at a predetermined "H" level. There is.

Next, the operation of this embodiment will be described with reference to the time chart shown in FIG. Note that FIG. 2 shows the relationship among the control signal 13, the transmission information on the common bus 30, the output of the control means 21a, and the fetch information of the bus interface circuit 21.

When transmitting the transmission information from the central processing unit 10 to each individual unit 20, the central processing unit 10 first causes the control signal generation circuit 12 to set the control signal line 13a to "H" level. To each individual unit 20. When each individual unit 20 receives this control signal 13, its control means 21a generates an initialization pulse for initializing the individual unit 20 at the rising edge of the control signal 13, thereby initializing the bus interface circuit 21. Subsequently, the central processing unit 10 transmits the transmission information to each individual unit 20 via the common bus 30. Each individual unit 20 receives this transmitted transmission information. Then, the central processing unit 10 sends the control signal 13 when the transmission of the transmission information is completed.
Is lowered from the “H” level to the “L” level. As a result, the reception of the transmission information in each individual unit 20 also ends.

After the reception is completed, each individual unit 20 confirms the error correction information (parity, CRC, etc.) sent together with the transmission information by the error correction circuit 22, and if there is no error, recognizes the reception information and completes the reception. By the control signal 13, the initialization of the bus interface circuit 21 of each individual unit 20,
Since it can be performed in synchronization with the communication on the common bus 30, the individual units 20 other than the central processing unit 10 are inserted / removed during data reception from the central processing unit 10, and the data on the common bus 30 is noisy. Even if it is disturbed by, the recovery by subsequent retransmission becomes easy.

Even when the central processing unit 10 is inserted or removed, by pulling up the control signal 13 at the “H” level voltage by the pull-up circuit 23 on each individual unit 20 side, all control signals 13 are It is initialized when the central processing unit 10 comes off, and no malfunction occurs.

In the above-described embodiment, the number of central processing units is one, but the same applies to a plurality of central processing units.

〔The invention's effect〕

As described above, according to the present invention, by giving a control signal for setting each individual unit to a receivable state, insertion / removal of an operating unit existing on a common bus, destruction of operation setting contents of another unit, logic This has the effect of preventing malfunctions such as runaway motions.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the device of the present invention. FIG. 2 is a time chart showing the operation. FIG. 3 is a block diagram showing an example of a conventional device. 10 ... Central processing unit, 11, 21 ... Bus interface circuit, 12 ... Control signal generation circuit, 13 ... Control signal, 13
a: control signal line, 20: individual unit, 21a: control means, 22: error correction circuit, 23: pull-up circuit,
30 ... Common bus.

Claims (3)

[Claims] 1. An in-apparatus unit control method for controlling transmission of transmission information from a central processing unit via a common bus to a plurality of individual units connected to the common bus in one apparatus, The central processing unit transmits a control signal for setting the individual unit to a receivable state when transmitting the transmission information through a control signal line different from the common bus, and the individual unit is in a receivable state by the control signal. A method of controlling a unit in a device, comprising: receiving the transmission information. 2. An apparatus comprising a central processing unit and a plurality of individual units connected to the central processing unit via a common bus, wherein the central processing unit is in a state capable of receiving transmission information from the individual units. Control signal generating means for generating a control signal for controlling, the individual unit includes a control means for setting the unit in a receivable state when receiving the control signal, the control signal from the central processing unit An apparatus comprising a control signal line different from the common bus connecting between the central processing unit and the individual unit for transmission to the individual unit. 3. The apparatus according to claim 2, wherein the individual unit includes holding means for holding the signal level of the connected control signal line at a predetermined level.