JPH03184112A - Method and device for controlling intra-device unit - Google Patents

Abstract

PURPOSE:To prevent malfunctions due to the loading/unloading of units by transmitting the control signals from a CPU in a transmission state to set the individual units in a receivable state respectively. CONSTITUTION:When the information on transmission is sent to each individual unit 20 from a CPU 10, the CPU 10 sets a control signal line 13a at H via a control signal generating circuit 12 and transmits a control signal 13 to each unit 20. The unit 20 receives the signal 13 and produces a pulse via a control means 21a to initialize the unit 20 at the rise of the signal 13. Then the unit 20 initializes a bus interface circuit 21. The CPU 10 transmits the information on transmission to the unit 20 via a common bus 30. Thus the unit 20 receives the information. Then the CPU 10 turns the signal 13 into L when the transmission is ended and the reception of the unit 20 is also ended.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides for transmitting operation setting information from a central processing unit to individual units connected to this common bus within one device via a common bus. It is used in a unit control method and device in a device that controls transmission.

〔overview〕

The present invention provides an intra-device unit control method for controlling the transmission of operation setting information from a central processing unit to individual units connected to the common bus via a common bus in one device. When transmitting information to an individual unit, a control signal that enables the individual unit to receive data is sent via a control signal line provided separately from the common bus, and the individual unit uses this control signal to enable the individual unit to receive data. By receiving setting information, malfunctions due to unit insertion and removal are prevented.

[Conventional technology]

FIG. 3 shows the block configuration of an example of a device using a conventional internal unit control method.

The central processing unit 10 and n individual units 20 are connected by a common bus 30, and the central processing unit 10
includes a bus interface circuit 11 and an individual unit 2
0 includes a bus interface circuit 21 and an error correction circuit 22, respectively.

[Problem that the invention seeks to solve]

In the device using the conventional device unit control method described above, the central processing unit 10 and each individual unit 20 are simply connected via the bus interface circuits 11 and 21, so that one of the units during operation When one individual unit 20 is inserted or removed, other individual units 20 or the central processing unit 10 are affected, resulting in a disadvantage that malfunctions are likely to occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and apparatus for controlling units within a device in which insertion and removal of an operating unit connected to a common bus will not cause malfunctions of other units by eliminating the above-mentioned drawbacks. be.

[Means for solving problems]

The intra-device unit control method of the present invention includes, within one device,
In an in-device unit control method for controlling transmission of transmission information from a central processing unit to individual UNI SOTOs connected to this common bus via a common bus, the central processing unit transmits transmission information. When doing so, a control signal for setting the individual unit to a receivable state is also transmitted, and the individual unit is set to a receivable state by the control signal and receives the transmitted information.

The device of the present invention includes a central processing unit and at least one individual unit connected to the central processing unit via a common bus, wherein the central processing unit receives information transmitted from the individual unit. The individual unit includes a control signal generating means for generating a control signal for controlling the individual unit to a receivable state, and the individual unit includes a control means for setting the unit to a receivable state when the individual unit receives the control signal.
The present invention is characterized in that a control signal line separate from the common bus connecting the central processing unit and the individual units is provided for transmitting the control signals from the central processing unit to the individual units.

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

[Effect]

A control signal is transmitted from the central processing unit via a control signal line at the time of transmission. This is for example the control signal line r)
(This is done by setting the level to J, whereby each individual unit is initialized and receives the transmitted information.

Therefore, even if an operating individual unit is inserted or removed and the transmitted information on the common bus is disturbed due to noise, the unit can be operated correctly by subsequent retransmission.

In addition, when the central processing unit is inserted or removed, each individual unit uses a holding circuit to maintain the level of the control signal line (r) (J
to hold. Since each individual unit is thereby initialized, malfunctions do not occur.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1' is a block diagram showing an embodiment of a device using the in-device unit control method of the present invention.

This embodiment includes a central processing unit 10 including a bus interface circuit 11, and n individual units connected to the central processing unit 10 via a common bus 30, each including a bus interface circuit 21 and an error correction circuit 22. 20, a feature of the present invention is that the central processing unit 10 generates 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 it can receive transmitted information. The individual unit 20 includes a control means 21a in its bus interface circuit 2I for setting the individual unit 20 in a receivable state when receiving the control signal I3, and transmits the control signal 13 from the central processing unit 10 to each unit. A control signal line 13a is provided that connects the central processing unit 10 and each individual unit 20 for transmission to the individual units 20, and the individual unit 20 further adjusts the signal level of the connected control signal line to a predetermined value (r). (Includes a pull-up circuit 23 as a holding means for holding the J level.

Next, the operation of this embodiment will be explained with reference to the time chart shown in FIG. In addition, in FIG. 2, the control signal 13, the transmission information on the common bus 3o, the control means 21
The relationship between the a output and the information taken in by the bus interface circuit 21 is shown.

When transmitting information from the central processing unit 10 to each individual unit 20, the central processing unit 10
First, the control signal generation circuit 12 sets the control signal line 13a to the rHJ level, thereby transmitting the control signal 13 to each individual unit 20. When each individual unit 20 receives this control signal 13, its control means 21a sends an initialization pulse to the control signal 1 to initialize the individual unit 20.
3, and the bus interface circuit 21 is thereby initialized.

Subsequently, the central processing unit 10 sends the transmitted information to the common bus 30.
to each individual unit 20 via.

Each individual unit 20 receives this sent transmission information. Then, when the transmission of the transmission information is completed, the central processing unit) 10 changes the control signal 13 from r)(J level to "L").
lower to the level. This also ends the reception of the transmission information in each individual unit 20.

After completion of reception, each individual unit 20 receives error correction information (parity, CRC, etc.) sent along with the transmission information.
After checking the error correction circuit 22, if there is no error, the received information is recognized and reception is completed.

Since it is possible to initialize the bus interface circuit 21 of each individual unit 20 in synchronization with communication on the common bus 30 using the control signal 13, the individual units 20 other than the central processing unit 10 can unit 1
Even if the data on the common bus 30 is disturbed by noise due to insertion or removal during data reception from 0, recovery by subsequent retransmission becomes easy.

Furthermore, even when the central processing unit) 10 is inserted or removed, all the control signals 13 can be is the central processing unit 10
It will be initialized when it is disconnected and no malfunction will occur.

In the above-described embodiment, only one central processing unit is used, but the same applies to a case where there is a plurality of central processing units.

〔Effect of the invention〕

As explained above, the present invention provides a control signal that enables each individual unit to receive data, thereby allowing the operation settings of other units to be destroyed and the logical This has the effect of preventing malfunctions such as runaway operation.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the apparatus 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, 13a...Control signal line, 20...
Individual unit, 21a...control means, 22...error correction circuit, 23...pull-up circuit, 30...common bus.

Claims (1)

[Claims] 1. An intra-device unit control method for controlling transmission of transmission information from a central processing unit to individual units connected to the common bus via a common bus within one device, comprising: When the central processing unit transmits the transmission information, the central processing unit also transmits a control signal for setting the individual unit to a receivable state, and the individual unit is set to a receivable state by the control signal and receives the transmission information. A method for controlling a unit within a device, characterized by: 2. In a device comprising a central processing unit and at least one individual unit connected to the central processing unit via a common bus, the central processing unit controls the individual unit to be ready to receive transmitted information. the individual unit includes a control means for setting the unit to a receivable state when receiving the control signal, the control signal is transmitted from the central processing unit to the individual unit. An apparatus characterized by comprising a control signal line separate from the common bus connecting the central processing unit and the individual units for transmission to the units. 3. The apparatus according to claim 2, wherein said individual unit includes a holding means for holding the signal level of said control signal line connected thereto at a predetermined level.