JP2002268911A - Development support device for electronic computer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently perform each of on-chip debug, real time trace and memory emulation using a JTAG port. SOLUTION: In this development support device 1 for an electronic computer, the JTAG connector 5 to be connected with a JTAG socket 105 of a target board 101 is provided with a terminal for JTAG test and a signal terminal exclusive for the on-chip debug. An exclusive connector 6 to be connected with a socket 106 exclusive for the target board 101 is provided with terminals (signal terminals for real time trace including an address terminal for a CPU 102, a data terminal, terminals ROM emulation including the address terminal for the CPU 102, the data terminal, a chip select terminal to the ROM 103 and a reset terminal) for extended functions to be used for the real time trace and ROM emulation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a development support device for a computer, and more particularly, to a development support device for a computer capable of efficiently performing on-chip debugging, real-time tracing, and memory emulation. .

[0002]

2. Description of the Related Art FIG. 5 is a perspective view showing an electronic computer system including an example of a conventional electronic computer development support apparatus. In this computer system 500, a CPU (Central Processing Unit) socket 5 is provided on a target board 501.
02, ROM (Read Only Memory) 503, and RAM
(Random Access Memory) 504 and I / O not shown
(Input / Output) circuit and the like are implemented. The computer aided development device 51 includes a computer aided development device main body 52, a cable 53 derived therefrom, and a CPU probe 54 attached to an end of the cable 53. By fitting the CPU probe 54 into the CPU socket 502, it is connected to the target board 501. This type of computer development support device 51 is called a CPU in-circuit emulator. Accordingly, the CPU to be mounted on the CPU socket 502
Is emulated by the computer development support device 51, and the target board 50 is emulated.
1 is verified.

FIG. 6 is a perspective view showing an electronic computer system including another example of a conventional electronic computer development support apparatus. In this computer system 600, the target board 60
1, a CPU 602, a ROM socket 603,
A RAM 604, an I / O circuit (not shown) and the like are mounted, a GND (ground) terminal, and an NMI (Non Mask).
Able Interrupt (non-maskable interrupt) terminal and a reset terminal are provided. The electronic computer development support device 61 includes an electronic computer development support device main body 62, a cable 63 derived therefrom, and a ROM probe 64 attached to an end of the cable 63. By fitting the ROM probe 64 into the ROM socket 603, the target board 6
01 is connected. By connecting the control probe 65 to each terminal on the target board 601, a GND level, an NMI signal, and a reset signal are given to the target board 601. This type of computer development support device 61 is called a ROM in-circuit debugger. As a result, the RO to be mounted on the ROM socket 603 is
The operation of M is emulated by the computer-aided development support apparatus 61, and debugging of the program is performed.

FIG. 7 is a perspective view showing an electronic computer system including still another example of a conventional development support apparatus for electronic computers. In the computer system 700, a CPU 702, a ROM 703,
AM704 and JTAG (Joint Test Action Group)
A socket 705 and an I / O circuit (not shown) and the like are mounted. The computer-based development support device 71 includes a computer-based development support device main body 72, a cable 73 derived therefrom, and a J attached to an end of the cable 73.
A TAG connector 74 is provided. By fitting the JTAG connector 74 into the JTAG socket 705, it is connected to the target board 701. Thus, the development support device 71 for the computer
Performs debugging using communication with a debugging function incorporated in the CPU 702, that is, on-chip debugging.

[0005]

The conventional computer development support device 51 has a problem that it is difficult to cope with an increase in the speed of the CPU and the mounting of a cache due to the CPU in-circuit method. Further, there is a problem that timely product release is hindered with the diversification of CPUs. Further, the conventional computer development support device 61 has a problem that it is difficult to cope with restrictions due to the occupation of the user memory space of the monitor area and the work memory and enhancement of the trace function because of the ROM in-circuit method. Further, the above-mentioned conventional computer development support device 71
However, there is a problem that it is difficult to perform real-time tracing of a memory around the CPU, input / output status, access status, and the like, and ROM emulation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a development support apparatus for a computer which can efficiently perform on-chip debugging using a JTAG port, real-time tracing, and memory emulation.

[0007]

SUMMARY OF THE INVENTION In a first aspect, the present invention provides a method for connecting to a JTAG port on a target board.
A development support device for an electronic computer, comprising: a TAG connector; and a dedicated connector having an extended function terminal used for real-time tracing and memory emulation of the target board. In the development support device for a computer according to the first aspect, the JTA
By connecting the G connector to the target board, JT
On-chip debugging using the AG port can be performed. Also, by connecting the dedicated connector to the target board, real-time tracing or memory emulation can be performed. As a result, on-chip debugging, real-time tracing, and memory emulation can be performed efficiently.

According to a second aspect, the present invention is a development support apparatus for a computer provided with a dedicated connector for connecting to a target board, wherein the dedicated connector is a JTA.
A development support device for a computer, comprising: a G terminal; and a terminal for an extended function used for real-time tracing and memory emulation. The second
In the development support system for computers from the viewpoint of the above, by connecting a dedicated connector to the target board, on-chip debugging using the JTAG port, real-time tracing using the terminal for extended functions, or memory emulation can be performed as necessary. And can be performed efficiently. In addition, since only one connector is required, it is convenient for miniaturization and cost reduction.

According to a third aspect of the present invention, in the development support apparatus for a computer having the above configuration, the extended function terminal controls the CPU mounted on the target board to acquire an operation status. A real-time trace signal terminal and a memory emulation signal terminal for emulating the operation of the memory by controlling the memory mounted on the target board to an active state or a standby state. Provide a development support device for an electronic computer. In the computer-aided development support apparatus according to the third aspect, real-time tracing can be performed using the real-time tracing signal terminal. Also, with the signal terminal for memory emulation,
Memory emulation can be performed.

According to a fourth aspect of the present invention, in the development support apparatus for a computer having the above configuration, the signal terminal for real-time tracing includes an address, data,
The memory emulation signal terminal includes an address, data, and data of the CPU.
A development support device for an electronic computer, comprising: signal terminals for chip select for the memory and reset of the target board. In the computer-aided development support apparatus according to the fourth aspect, real-time tracing can be suitably performed by the CPU address, data, and status signals. Further, the memory emulation can be suitably performed by the CPU address, data, chip select, and reset signals.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the drawings. Note that the present invention is not limited by this.

First Embodiment FIG. 1 is an explanatory diagram showing an electronic computer system including an electronic computer development support apparatus according to a first embodiment of the present invention. In this computer system 100, a CPU 102, a ROM 10
3, the RAM 104, and the C using the JTAG port.
A JTAG socket 105 for exchanging signals required for on-chip debugging of the PU 102, a dedicated socket 106 for exchanging signals required for real-time tracing or ROM emulation, and an I / O circuit (not shown) are mounted. . The ROM 103 is
For example, a flash ROM. The RAM
104 is, for example, an SDRAM (Synchronous Dynamic Ra).
ndom Access Memory).

An electronic computer development support apparatus 1 comprises an electronic computer development support apparatus main body 2 and cables 3 and 4 derived from the electronic computer development support apparatus main body 2.
And a JTAG connector 5 attached to the end of the cable 3 and a dedicated connector 6 having an extended function terminal (6a in FIG. 2). The main body 2 of the development support device for a computer includes an on-chip debug support section 2 a for performing on-chip debugging through the JTAG connector 5 and a real-time trace for real-time tracing the operation of the target board 101 through the dedicated connector 6 And a ROM emulation unit 2c for emulating the operation of the ROM 103 through the dedicated connector 6. By fitting the JTAG connector 5 into the JTAG socket 105 and fitting the dedicated connector 6 into the dedicated socket 106, the computer development support apparatus 1 and the target board 101 are connected.

The JTAG connector 5 has JTAG test terminals, ie, TCK (test clock), TMS
(Test mode selector), TDI (test data in), TDO (test data out), and TRST (asynchronous test reset) signal terminals, as well as a dedicated signal terminal for on-chip debugging. The CPU
Depending on the type of 102, the dedicated signal terminal for on-chip debugging is unnecessary.

FIG. 2 is an explanatory view of a terminal portion of the dedicated connector 6. Note that the terminal arrangement and the number of terminals may be different from those shown. Further, a GND terminal and a power supply terminal may be further provided. The extended function terminal 6a is a real-time trace signal terminal 6r used for real-time trace.
And a ROM emulation signal terminal 6e used for ROM emulation. The signal terminal 6r for real-time tracing and the signal terminal 6e for ROM emulation include an “address terminal” for receiving an address from the CPU 102, a “data terminal” for exchanging data, and a signal ( For example, a “CPU unique signal terminal” for transmitting a control signal to the RAM 104 and a “clock terminal” of the CPU 102 are shared. The real-time trace signal terminal 6e further has a “status terminal” for receiving a status from the CPU 102.
The ROM emulation signal terminal 6e is connected to the R
A “chip select terminal” for sending a chip select signal for controlling the OM 103 to an active state or a standby state;
A “reset terminal” for sending a reset signal to the target board 101 is further provided.

According to the computer-aided development support apparatus 1 according to the first embodiment, it is possible to perform on-chip debugging using a JTAG port through the JTAG connector 5. Thereby, the original CPU 10
2 and the ROM 103 can be debugged in hardware or software in an operating environment, that is, a condition of 100% transparency. In addition, a CPU is connected through a real-time trace signal terminal 6r of the dedicated connector 6.
It is possible to perform real-time tracing on the operation status (for example, read / write status, input / output status, access status) of the RAM 102, ROM 103, and RAM 104. The function of a bus analyzer corresponding to a system bus clock frequency of, for example, about 100 MHz can also be realized by using the same signals as those used in real-time tracing. Further, emulation of the ROM 103 can be performed through the ROM emulation signal terminal 6e of the dedicated connector 6.

Second Embodiment FIG. 3 is an explanatory diagram showing an electronic computer system including an electronic computer development support apparatus according to a second embodiment of the present invention. In this computer system 200, a CPU 102 and a ROM 10
3, a RAM 104, a dedicated socket 206 for exchanging signals necessary for on-chip debugging, real-time tracing, and ROM emulation, and an I / O circuit (not shown) and the like.

The computer-aided development support apparatus 10 comprises a computer-aided development support apparatus body 20, a cable 24 derived from the computer development aid apparatus body 20, and a dedicated connector attached to an end of the cable 24. 26. The development support device body 20 for a computer is connected to the JT through the dedicated connector 26.
An on-chip debugging unit 20a for performing on-chip debugging using an AG port; a real-time trace unit 20b for real-time tracing the operation of the target board 201; and a ROM emulation unit for emulating the operation of the ROM 103 20c. By fitting the dedicated connector 26 into the dedicated socket 206, the computer development support device 10 and the target board 201 are connected.

FIG. 4 is an explanatory view of a terminal portion of the dedicated connector 26. The JTAG terminal 26a has a JTAG test terminal and a dedicated signal terminal for on-chip debugging. The extended function terminal 6a is connected to a real-time trace signal terminal 6r used for real-time trace and a RO.
And a ROM emulation signal terminal 6e used for M emulation (the contents of each terminal are as described above with reference to FIG. 2).

According to the development support apparatus 10 for a computer according to the second embodiment, the target board 201
By simply connecting the dedicated connector 26 to the CPU, any of on-chip debugging, real-time tracing, and memory emulation can be arbitrarily performed. Also, since only one connecting cable and one connector are required (only the cable 24 and the dedicated connector 26 are required), it is convenient for miniaturization and cost reduction.

[0021]

According to the computer aided development support system of the present invention, the JTAG connector and the dedicated connector are connected to the target board, or the on-chip debugging, real-time trace,
Memory emulation can be performed flexibly, and development efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an electronic computer system including an electronic computer development support device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a terminal portion of a dedicated connector in the computer-aided development support device of FIG. 1;

FIG. 3 is an explanatory diagram showing an electronic computer system including an electronic computer development support device according to a second embodiment of the present invention.

FIG. 4 is an explanatory diagram of a terminal portion of a dedicated connector in the computer-aided development support device of FIG. 3;

FIG. 5 is a perspective view showing an electronic computer system including an example of a conventional development support device for electronic computers.

FIG. 6 is a perspective view showing an electronic computer system including another example of a conventional electronic computer development support device.

FIG. 7 is a perspective view showing an electronic computer system including still another example of the conventional computer development support device.

[Explanation of symbols]

 1,10 Computer development support device 2,20 Computer development support device main body 2a, 20a On-chip debug support unit 2b, 20b Real-time trace unit 2c, 20c ROM emulation unit 3, 4, 24 Cable 5 JTAG connector 6, 26 Dedicated connector 6a Extension function terminal 6e ROM emulation signal terminal 6r Real-time trace signal terminal 26a JTAG terminal 100,200 Computer system 101,201 Target board 102 CPU 103 ROM 104 RAM 105 JTAG socket 106,206 Dedicated socket

Claims (4)

[Claims] 1. A development for a computer, comprising: a JTAG connector connectable to a JTAG port of a target board; and a dedicated connector having an extended function terminal used for real-time tracing and memory emulation of the target board. Support equipment. 2. A development support device for a computer having a dedicated connector for connecting to a target board, wherein the dedicated connector has a JTAG terminal and a terminal for an extended function used for real-time tracing and memory emulation. A computer-aided development support device. 3. The development support device for a computer according to claim 1, wherein said extended function terminal comprises:
A real-time tracing signal terminal for controlling a CPU mounted on the target board to obtain an operation status, and controlling the operation of the memory by controlling a memory mounted on the target board to an active state or a standby state; And a memory emulation signal terminal for emulating a computer. 4. The development support device for a computer according to claim 3, wherein the real-time trace signal terminal includes an address, data, and status signal terminals of the CPU, and the memory emulation signal terminal includes: The CPU
An address, data, a chip select for the memory, and a signal terminal for resetting the target board.