JPH1083320A - Microprocessor built-in device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily perform an analyzing process, etc., in a short time by providing the microprocessor built-in device with a selecting means which connects an external connection terminal or a microprocessor to a subordinate device. SOLUTION: In a multi-chip module MCM, a selector SEL and, for example, four terminals are provided. Then '0' is inputted as a select signal input IN to one terminal at the time of debugging or fault occurrence. At this time, the selector SEL connects signal lines (address bus ABUS, data DBUS, and bus control signal BUSCONT) connected to other three terminals to subordinate devices EQ0-EQn. Control from outside the multi-chip module MCM, therefore, becomes possible. Further, when a program is debugged at the time of newly development or function addition, an emulator is connected generally as an external device to the said three terminals to enable the debugging while tracing the program.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a microprocessor built-in device. For example, the present invention relates to a device in which one or a plurality of microprocessors and peripheral devices thereof are formed into a multi-chip module.

[0002]

2. Description of the Related Art Various types of electronic equipment have been remarkably multifunctional today, and there are not a few electronic devices each having a dedicated function module for each function. The functional module includes a microprocessor and its peripheral devices as components. FIG. 2 shows the basic configuration of such a functional module.

[0003] As shown in FIG.
Microprocessor MPU and multiple subordinate devices EQ
0 to EQn. Microprocessor MPU and subordinate devices EQ0-E under its control
Qn is directly connected to three types of signal lines, and various functions required by the data transmission via the signal lines are realized.

Here, the three types of signal lines are an address bus ABUS, a data bus DBUS and a bus control signal BUS.
There are three types of CONT. Also, the subordinate devices EQ0 to EQ
n is a ROM, RAM, or other device dedicated to a user for storing programs, and the number and types of the devices differ depending on the functions to be realized. Some of the specific subordinate devices have an external bus.

[0005]

However, a functional module having such a configuration is called a multi-chip module (MCM).
In order to verify the operation of the program and to isolate the fault location when a hardware fault occurs, the actual stored program is executed step by step, and the execution result matches the expected result. There is no other way than to confirm whether or not to do so, and there is a problem that the operation takes a lot of time.

In addition, the work is performed in a situation where it is not known whether or not there is a bug in the internal program, and in a situation where it is not possible to know where a failure occurs in each processing unit executing the program. There was a problem that it was very difficult to specify the location of the failure and to remove bugs in the program.

[0007]

Means for Solving the Problems In order to solve the above problems, the present invention is characterized in that a microprocessor built-in device in which at least one microprocessor and a subordinate device are arranged on the same base is as follows. And

That is, (1) an external connection terminal having one end connected to a common bus, and (2) a selection means for connecting one of the external connection terminal and the microprocessor to a subordinate device via the common bus. It is characterized by having been provided.

In the microprocessor built-in device of the present invention, at the time of an analysis process at the time of occurrence of a failure or the like, the external device and the subordinate device can be connected via the external connection terminal to execute the analysis process. As a result, a failure analysis can be performed in a shorter time and more easily than when a failure location in the device is specified and analyzed only from the execution result of the execution program.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

(A) First Embodiment Hereinafter, a first embodiment of a microprocessor built-in device according to the present invention will be described.
Will be described with reference to the drawings.

(A-1) Configuration of First Embodiment FIG. 1 shows a configuration example of a microprocessor built-in device according to the first embodiment.

The device with a built-in microprocessor according to this embodiment is characterized in that the subordinate devices EQ0 to EQn in the multichip module MCM are connected to the multichip module MCM.
Is that it can be controlled not only from the inside but also from the outside. That is, the present embodiment is characterized in that an arbitrary test corresponding to a test item can be performed, whereas the conventional method had only to execute a program to be actually executed.

Means newly provided to realize this function are a selector SEL provided in the multi-chip module MCM and four terminals P1 to P4.

Here, when the control from inside is selected by the selection signal input IN, the selector SEL supplies a signal line (address bus AB) of the internal microprocessor MPU1.
US, data bus DBUS, bus control signal BUSCON
T) is connected to the subordinate devices EQ0 to EQn, and the switching signal IN
When the external control is selected by the
Signal lines from an external device connected to P3 (address bus ABUS, data bus DBUS, bus control signal BUSC
ONT) is connected to the subordinate devices EQ0 to EQn.

As an external device, an external microprocessor MPU0 or an emulator is connected. For example,
If the external microprocessor MPU0 is connected, the operation can be checked at the same timing as the internal microprocessor MPU1, and if an emulator is connected, the validity of the subordinate devices EQ0 to EQn of the internal microprocessor MPU1 can be checked.

In addition, the subordinate devices EQ0 to EQn provide the RO for storing the program as described in the related art.
A peripheral device including an M, a RAM, and other user-dedicated devices. In some subordinate devices, an external bus may be provided outside the multi-chip module MCM.

(A-2) Operation of First Embodiment Next, an operation example of the microprocessor built-in device having such a configuration will be described as (1) an operation at the time of bug removal and failure analysis,
(2) The operation will be described separately from the operation during the normal operation. First, the operation at the time of bug removal or failure occurrence will be described. In this case, "0" is input to the terminal P4 as the selection signal input 1N. At this time, the selector SEL is connected to signal lines (address bus ABUS, data bus DBU) connected to the terminals P1 to P3.
S, the bus control signal BUSCONT)
Connect to EQn. As a result, control from outside the multi-chip module MCM becomes possible.

Here, when a bug is to be removed when a program is newly developed or a function is added, an emulator is generally connected to the connection terminals P1 to P3 as an external device. By using the emulator in this way, a bug can be removed while tracing the program, so that the normality of the program can be quickly confirmed and the development period can be shortened.

Also, when a hardware failure occurs, the emulator may be connected as an external device. Also in this case, if an emulator is used, a combination of instructions necessary for specifying the fault location while analyzing the fault content can be arbitrarily set, and the fault location can be easily analyzed.

As described above, the emulator is a device which is effective for bug analysis as well as bug removal, but complete compatibility is guaranteed such that the operation clock may not match the operation clock of the internal microprocessor MPU1. In such a case, an external microprocessor MPU1 having the same configuration as the internal microprocessor MPU1 may be used as an external device. By connecting the external microprocessor MPU0 in this way, analysis based on actual operation timing can be realized.

On the other hand, during normal operation, "1" is input to the terminal P4 as the selection signal input 1N. At this time, the selector SEL is connected to the internal microprocessor M
PU1 signal lines (address bus ABUS, data bus D
BUS, bus control signal BUSCONT)
0 to EQn. Thereby, the subordinate devices EQ0
The EQn executes a process corresponding to a function required under the control of the internal microprocessor MPU1.

(A-3) Effects of the First Embodiment As described above, according to the first embodiment, the selector SEL is provided in the multi-chip module MCM, and the subordinate devices EQ0 to EQn are connected to the internal microprocessor MPU1. And a configuration that can be controlled by both external devices, realizes a device with a built-in microprocessor that can complete bug removal and failure analysis tasks that were extremely difficult and time-consuming in the past in a short time. can do.

(B) Other Embodiments (B-1) In the above-described first embodiment, the configuration example of the microprocessor built-in device according to the present invention has been described using the multi-chip module MCM as an example. The present invention is not limited to this, and can be applied to a functional module in which these devices are bonded on a printed circuit board PCB.

FIG. 3 shows an example of the configuration of such a functional module. As in the case of the first embodiment, an interface with an external microprocessor MPU0 (or emulator) is accommodated in a terminal of a printed circuit board PCB. It is characterized by having. As shown in FIG. 3, the configuration is the same as that of the first embodiment, and the basic operation and effects are the same.

(B-2) In the above embodiment,
A case has been described in which the connection between the internal microprocessor MPU1 and the external device is switched between the subordinate devices EQ0 to EQn. However, the present invention is not limited to this, and the connection between the three or more microprocessors and the like and the subordinate device is switched. It can also be applied to cases.

(B-3) Further, in the above embodiment, the case where the external microprocessor MPU0 or the emulator is appropriately connected to the terminals P1 to P3 provided in the function module has been described. An interface may be provided so that the connection between .about.P3 and the external microprocessor MPU0 or the emulator can be arbitrarily switched.

[0027]

As described above, according to the present invention, the selection means for connecting either the external connection terminal or the microprocessor to the subordinate device is provided in the microprocessor built-in device, so that the failure analysis processing and the like can be performed. In this case, it is possible to control the subordinate device from the outside via the external connection terminal, and it is possible to perform analysis processing etc. in a shorter time and easier than in the past, where a failure point in the device is specified and analyzed only from the execution result of the execution program. Can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of a device with a built-in microprocessor according to a first embodiment.

FIG. 2 is a block diagram showing a configuration example of a conventionally used microprocessor built-in device.

FIG. 3 is a block diagram illustrating a configuration example of a device with a built-in microprocessor according to another embodiment.

[Description of Signs] MPU0, MPU1 microprocessor, SEL selector, ABUS address bus, DBUS data bus, BUSCONT bus control signal, EQ0 to EQn ...
Subordinate device, MCM ... Multi-chip module, PCB ...
Printed board.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yoshiyuki Ejima 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd.

Claims (2)

[Claims] 1. A microprocessor built-in device in which at least one microprocessor and a subordinate device are arranged on the same base, wherein one of the external connection terminal having one end connected to a common bus, and the external connection terminal or the microprocessor. A built-in microprocessor, comprising: a selection unit for connecting one of the subordinate devices to the subordinate device via a common bus. 2. The microprocessor built-in device according to claim 1, wherein an interface used for connection to an emulator is connected to the external connection terminal.