JPH03250353A - Bus controller - Google Patents

Abstract

PURPOSE:To freely control an electronic equipment via an external computer by securing the connection between these equipment and computer via an external bus relaying means and enabling the external computer to occupy an internal bus of the electronic equipment. CONSTITUTION:A bus extending means 11 is provided to lead out a 1st internal bus of an external computer 10 together with a bus conversion means 8 which leads out a 2nd internal bus 3 connected to an internal CPU 5 of an electronic equipment 1, and an external bus relaying means 9 which secures the connection between both means 8 and 11. Thus the means 11 of the computer 10 is connected to the means 8 of the equipment 1 via the means 9. Then the 1st bus information sent to the 1st internal bus of the computer 10 from the means 11 is converted into the 2nd bus information which is given to the bus 3 of the equipment 1 by the means 8. Thus the computer 10 can freely control the equipment 1 with occupation of the bus 3.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a bus control device, and is particularly suitable for use in controlling electronic equipment having an internal CPU from an external computer.

B. Summary of the Invention The present invention provides a bus control device in which an external computer and an electronic device are connected by an external bus relay means, and bus information for the internal bus of the external computer is converted into bus information for the internal bus of the electronic device by a bus conversion means. By performing the conversion, it is possible to freely control the electronic device from an external computer.

C Conventional technology Conventionally, an internal CPU (central process)
In an electronic device incorporating a single unit (sing unit), instructions and data are exchanged with each circuit section of the electronic device through an internal bus connected to the CPU.
U controls each circuit section of the electronic device.

By the way, in electronic equipment that has a CPU, the internal program of the CPU is changed to a test program in machine language such as an assembler, and by running this worst program, it is possible to examine and adjust each circuit part within the electronic equipment. It is designed to be able to carry out the work.

D Problems to be Solved by the Invention However, if the control of each circuit section of the electronic device by the CPU is relatively light, it is relatively easy to change the internal program to a test program using an assembler as described above. However, as each circuit section of electronic equipment becomes more complex, the CPU
If the control becomes complicated, the examination and adjustment of each circuit section itself becomes a load on the CPU, making it impossible to perform the examination and adjustment correctly.

In addition to this 4L, the software development environment for electronic devices incorporating CPUs is insufficient due to space constraints, and it is necessary to study and adjust each circuit part of complex electronic devices. Creating a complex and huge test program using an assembler requires a large amount of man-hours and troublesome effort, which ultimately makes it difficult to implement.

The present invention has been made in consideration of the above points, and attempts to propose a bus control device that can control the inside of an electronic device using an external convenience store, and can easily perform examination and adjustment work. It is something.

E Means for Solving the Problems In order to solve the problems, the present invention provides a bus expansion means 11 for deriving the first internal bus of the external computer 1.0, and a bus extension means 11 for deriving the first internal bus of the external computer 1. 2
bus conversion means 8 for deriving the internal bus 3 of the external computer 10, and external bus relay means 9 for connecting the bus expansion means 11 and the bus conversion means 8, and the bus conversion means 8 of the electronic device IL, and the bus extension stage 1 of the external computer 10.
The first bus information for the first internal bus sent from the electronic device 1 is transferred to the second internal bus 3 of the electronic device 1 by the bus conversion means 8.
The information is now converted to the second bus information.

An external bus relay means 9 connects an external computer 10 and an electronic device 1, and a bus conversion means 8 converts bus information for the internal bus of the external computer 10 into bus information for the internal bus 3 of the electronic device 1. By doing so, the internal bus 3 of the electronic device 1 can be occupied and freely controlled from the external computer IO.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

In the figure, 1 indicates an electronic device as a whole, and N wiring boards PBi, PB2, . . . are respectively connected to this CPtJ board 2 through a CPU board 2 and an internal bus 3.
・, PBN.

On this CPU board 2, there is a C
PU 5 is connected, and internal commands and internal data output from CP tJ 5 are transferred to CPU bus 4 and bus buffer 6.
The signal is sent to the internal bus 3 through the internal bus 3.

In addition to this, the board control signal output from the CPU 5 is
It is sent to the internal bus 3 through the IO port 7, and thereby the desired wiring boards PB1, PB2, . . . are sent from the CPU 5.
..., internal commands and internal data are transferred to the PBN.

The internal bus 3 includes a data bus, an address bus, a read signal, a write signal, and a select signal.
Further, in the case of this embodiment, this internal bus 3 can be led out to the outside through a conversion board 8.

Actually, this conversion board 8 sends a bus request signal RQi.
os and a boat request signal RQ lo, this bus request rent RQw=us is inverted through an inverter 6A on the CPU board 2 and inputted to the inversion control terminal of the path buffer 6, and the boat request signal RQi . is input to the inversion control terminal of the 10-board 7.

In fact, this conversion board 8 is connected to, for example, an expansion board 11 of a personal computer 10 through a bus harness 9.

Note that this expansion board 11 is equipped with a personal computer 10.
For example, when the personal computer 10 side occupies the internal bus 3 of the electronic device 1, the personal computer 10 controls the bus request signal RQmus of the conversion board 8 to the logic "L" level, and As a result, the CPU 5 of the electronic device 1 is disconnected from the internal bus 3.

In this manner, with the personal computer 10 occupying the internal bus 3 of the electronic device 1, the personal computer 10 creates simulated internal commands and internal data output from the CPU 5 of the electronic device 1, and transfers them to the bus harness. 9 to the internal bus 3, and thus the internal commands and internal data are transferred to the desired wiring boards PBI, PB2, . . . , PBN, and the electronic device 1 executes operations accordingly.

However, normally in such a state, the CP of the electronic device 1
Internal commands and internal data from U5 are sent to wiring boards PBI and P.
B2, . . . , cannot be transferred to the PBN, but in this embodiment, the CPU 5 first writes internal commands and internal data to be executed to the IO boat 7.

Next, while occupying the internal bus 3, the personal computer 10 uses the boat request signal RQ1° to read the contents of the ■0 boat 7, and sends the resulting internal commands and internal data to the internal bus of the electronic device 1. Transfer to 3.

In this manner, in the case of this embodiment, even when the personal computer 10 occupies the internal bus 3, the personal computer 10 can execute the operation of the electronic device 1 that the CPU 5 desires to execute on its behalf.

Conversely, the personal computer 10 can also write predetermined commands and data to the IO boat 7 and pass the predetermined commands and data to the CPU 5 using the boat request signal RQ+o. The internal bus 3 of the personal computer 10 can be shared by the CPU of the personal computer 10 and the internal CPU 5.

In the above configuration, for example, the wiring board PB of the electronic device 1
iPB2,..., consider each part of PBN,
When performing adjustment work, first check these wiring boards PBI, PB2, . . . on the personal computer 10.
・Create a test program for PBN.

After that, by connecting the expansion board 11 of the personal computer 10 and the conversion board 8 of the electronic device 1 using the bus harness 9, and running the test program on the personal computer 10, the wiring boards PBI, P of the electronic device 1 are connected.
B2, . . . , can perform examination and adjustment work for each part of the PBN.

In fact, since the personal computer 10 has a well-developed software development environment, it is possible to create test programs for the wiring boards PBI, PB2, . . . , PBN using a so-called high-level language. It is possible to describe the operation of each part.

According to the above configuration, the conversion board of the electronic device and the expansion board of the personal computer are connected with the bus harness, and the personal computer can occupy the internal bus of the electronic device, so that the personal computer can be used to connect the electronic device. It is possible to realize a bus control device that can freely control and easily perform examination and adjustment work.

Further, according to the above-described configuration, since the personal computer is used to control the electronic device during examination and adjustment work, the load on the CPU itself of the electronic device can be significantly reduced.

In the above embodiment, a bus harness is used as the external bus relay means, but instead of this, a bus pattern or the like may be provided on the relay board.

Further, in the above embodiment, a case was described in which a personal computer was used as the external computer, but the present invention is not limited to this, and for example, a bus of a general-purpose computer, etc. may be connected to an internal bus of an electronic device. .

Effects of the Invention As described above, according to the present invention, an external computer and an electronic device are connected by an external bus relay means so that the external computer can occupy the internal bus of the electronic device. A bus control device that can freely control electronic devices can be realized.

In this way, by being able to control the examination and adjustment work of the electronic device using an external computer, the work efficiency and accuracy of the examination and adjustment work can be significantly improved.

[Brief explanation of drawings]

The figure is a block diagram showing an embodiment of a bus control device according to the present invention. 1...Electronic equipment, 3...Internal bus, 5
...CPU, 8... Change 1111[,9
... Bus harness, 10 ... Personal computer, 1 ... Expansion board, PBI to PBN ... Wiring board. Agent Keiki Tanabe

Claims (1)

[Scope of Claims] Bus expansion means for deriving a first internal bus of an external computer; bus conversion means for deriving a second internal bus connected to a CPU inside an electronic device; the bus expansion means and the above. an external bus relay means for connecting the bus conversion means, the external bus relay means connects the bus expansion means of the external computer and the bus conversion means of the electronic device, and the bus expansion means of the external computer The first bus information for the first internal bus sent from the electronic device is converted by the bus conversion means into second bus information for the second internal bus of the electronic device. Bus control device.