JPS63136236A - Switching device debugging - Google Patents

Abstract

PURPOSE:To obtain a debugging device that can debug various microprocessors by using switching circuit to perform changeover between the debug device for a CPU of the microprocessor and that the a general-purpose CPU. CONSTITUTION:When a debugging job is performed concerning a CPU part, the function of a CPU part 1 in a microprocessor 10 is stopped by a command given from a switching circuit 23 and buffers 21 and 23 are validated. Thus, a debugging device 30 is connected to a user system 40 via both buffers 21 and 22. Then the device 30 debugs the functions related to the CPU like a normal debugging job. Then the peripheral functions are debugged by actuating the system 40 via a peripheral function part 2 of the processor 10. Thus it is possible to obtain a debugging device that can debug various microprocessors including the CPU parts and peripheral function parts like general-purpose microprocessor.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a debugging switching device for debugging software and hardware of a system using a microprocessor, and particularly to a debugging switching device for debugging software and hardware of a system using a microprocessor. It is used for debugging microprocessors.

(Prior Art) Various debugging devices have been developed to remove bugs in system software and hardware.

This is, for example, a device that can step by step execute every instruction that the microprocessor in use has and reference the memory contents at any address, and debug devices are generally created for each type of general-purpose processor. .

Examples of such debugging devices include those for Intel Corporation 18085, Motorola Corporation M6800, and Zilog Corporation Z80, which are widely used as general-purpose CPUs.

However, an increasing number of recently developed microprocessors have built-in peripheral functions such as input/output device control, counters, and DMA in addition to general-purpose processor functions. To debug such a microprocessor, conventional debugging equipment cannot be used as is, and it is necessary to prepare dedicated debugging equipment for each peripheral function. Furthermore, in order to use such a debugging device, debugging is performed by removing the microprocessor in the user system from the socket and replacing the functions of the CPU with an evaluation CPU in the debugging device.

In addition, in order to debug a microcontroller based on a microprocessor, in which the microprocessor is fixed with non-removable soldering, etc., and peripheral functions have been expanded, it is necessary to add functions that are not present in the original controller. It is necessary to create a debug function section for each section on a separate board and connect it with a dedicated cable. Furthermore, removing a fixed microprocessor for debugging is a complicated task, especially in the case of a flat package type, and is also prone to lead breakage, which poses problems in terms of reliability.

(Problems to be Solved by the Invention) As described above, in conventional debugging devices for microprocessors, even if the built-in CPU has the same functions as a general-purpose CPU, due to the existence of peripheral functions, a dedicated In addition to problems such as the need for a debugging device and the need to provide a dedicated extension section, there are also problems in workability depending on the implementation form of the microprocessor.

The present invention has been made to solve these problems, and provides a debugging device capable of debugging various microprocessors including a CPU section and a peripheral function section similar to general-purpose microprocessors. The purpose is to

[Structure of the invention]

(Means for solving the problem) In the debugging switching device according to the present invention, a general-purpose C
The general-purpose CPU is connected between a debugging target controlled by a microprocessor that includes a CPt1 unit and a peripheral function unit that have the same functions as the PU, and a general-purpose CPU debugging device.
A buffer that relays instructions and data between the U debug device and the user system, and a buffer that relays instructions and data between the U debug device and the user system, and a buffer that provides instructions and data to the debug target from the general-purpose CPU debug device when debugging related to the CPU section, and peripheral functions. When performing debugging related to the depacking section, instructions and data are given to the debugging target from the peripheral function section of the microprocessor installed in the depacking switching device of the present invention.

(Function) In the debugging device of the present invention, the CPU section of the microprocessor used in the system etc. to be debugged is a general-purpose CPU.
When debugging the CPU is performed using a debugging device for a general-purpose CPU, and when debugging the peripheral function section, the peripheral of the microprocessor installed in the depacking switching device of the present invention is used. Debugging is performed using the functional section. Therefore, if the CPU part is the same as a general-purpose CPU, a debugging device for a general-purpose CPU can be used as is, and a conventional debugging device can be used without modification.

(Embodiments) Hereinafter, some embodiments of the debugging device according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a debug system including an embodiment of a debug switching device according to the present invention, in which a switching device 20 is provided between a general-purpose CPU debug device 30 and a user system 40 to be debugged. Indicates a connected state.

This switching device 20 includes buffers 21 and 22 that interface with a debug device and a user system, respectively, and a switching circuit 23 connected to these buffers and the CPU. This switching device also includes a socket for mounting a microprocessor, and by replacing the microprocessor mounted in this socket, the peripheral function section of the microprocessor can be replaced. Through this socket, the CPU section 1 and peripheral function section 2 of the microprocessor 10 are connected to the buffer sections 21 and 22 via a data bus 24 and to the switching circuit 23 via a control line 25.

The switching circuit 23 outputs a signal, for example DISABLE, to the CPU section 1 to stop its function, and operates the buffers 21 and 22 according to the content of debugging.

First, when debugging related to the CPU section, the function of the CPU section 1 in the microprocessor 10 is stopped by a command from the switching circuit 23, and the functions of the CPU section 1 in the microprocessor 10 are stopped.
ENABLE. Therefore, the debug device 30 and the user system 40 are connected to the buffers 21 and 2.
2, the debugging device 30 debugs functions related to the CPU in the same way as normal debugging.

Next, in order to debug peripheral functions, the user system 40 is operated using the peripheral function section 2 of the microprocessor, and the peripheral functions are debugged. Here, the peripheral functions include port serial transfer/parallel transfer conversion function and DMA.

Counters, clocks, LCD display drivers, clocks, A/
There are D conversions, etc.

Here, an example of a circuit configuration for enabling or disabling the function of each operating section by a signal from the switching circuit 23 is as follows.
As shown in the figure.

According to the figure, by manually applying a switching signal Ss to a tri-state logic circuit that can transmit signals bidirectionally between terminals A and 8, input/output in the CPU section is disabled.

FIG. 3 is a block diagram showing another embodiment of the debug switching device according to the present invention.

In this embodiment, a microprocessor 10 is attached to a user circuit section 50 in a user system 60 in an inseparable manner, such as by soldering, and the CPU section 1 and peripheral function section 2 in the microprocessor are connected to the user circuit section. 50 are connected to each other by an address bus 81, a data bus 82, and a control bus 83, and I1 of the peripheral function section 2
The 0 port and the user circuit unit 50 are connected. Such a user system 60 is connected to a debug device 30 for a general-purpose CPU via a debug switching device 70 according to the present invention. The switching device 70 includes a switching circuit 71 and a buffer 72, and the buffer 72 interfaces the signals sent by each bus between the debug device 30 and the user system 60. In addition, the switching circuit 7
1 outputs, for example, a D I 5ABLE signal to the CPU section 1 to stop its function as a CPU. Therefore, when the DISABLE signal is supplied to the bin for that purpose, the CPU section 1 in the microprocessor]0 becomes inoperable, so the user circuit section 50 is transferred to the debug device 30.
can be driven and debugged. Furthermore, when debugging the peripheral functions of the user circuit section 50, the peripheral functions of the user circuit section 50 can be driven by the peripheral function section 2 of the microprocessor 10 to perform debugging.

In the above embodiments, the DISABLE signal is used as an example of a command to stop the CPU function, but the present invention is not limited to this, and various hardware-based function stop means can be used.

〔Effect of the invention〕

As described above, according to the present invention, the microprocessor C
It is equipped with a switching circuit that switches between the PU and a general-purpose CPU debugging device, so when debugging the CPU part of the user system, the general-purpose CPU debugging device is used, and when debugging the peripheral function section, the microprocessor's debugging device is used. Since debugging is performed using the peripheral function section, there is no need to prepare a dedicated debugging device for each microprocessor, even if the microprocessor is based on a general-purpose CPU and has expanded peripheral functions, reducing equipment costs. can be achieved.

Further, even if the microprocessor is fixed to the user system by soldering or the like, if the CPU function can be stopped, the system can be debugged efficiently without removing the microprocessor.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing debugging using a switching device according to the present invention, FIG. 2 is a circuit diagram showing an example of a switching circuit for switching CPUs, and FIG. 3 is another embodiment of the present invention. FIG. DESCRIPTION OF SYMBOLS 1...CPU part, 2...Peripheral function part, 10...Microprocessor, 20.70...Switching device, 21°22.72...Buffer, 23.71...Switching circuit, 30...Debug device, 40.60...User system, 50...User circuit section, 81...Address bus, 82...Data bus, 83...Control bus.

Claims (1)

[Scope of Claims] 1. Connected between a debugging device for a general-purpose CPU and a debugging target controlled by a microprocessor that includes a CPU having the same functions as a general-purpose CPU and a peripheral function unit, and a debugging device for the general-purpose CPU; a buffer for relaying instructions and data between the device and the user system;
When performing debugging related to the PU section, the general-purpose CPU
For debugging, the debugging device provides instructions and data to the debug target, and when debugging related to the peripheral function unit, the peripheral function unit provides instructions and data to the debug target. Switching device. 2. The switching device for debugging according to claim 1, wherein the microprocessor is detachably attached to the object to be debugged by a socket and connected to the switching section and the buffer. 3. Claim 1, wherein a microprocessor is fixed to a debug target, and the switching unit causes the microprocessor to stop its function as necessary.
Debug switching device described in section.