JPS6318444A - System for developing software development supporting system - Google Patents

Abstract

PURPOSE:To efficiently support software development, by providing a terminal emulate board having the same terminal function as a target microprocessor has to a personal computer. CONSTITUTION:The I/O access to the memory of a target microprocessor is made by storing data in the terminal register 222 of a terminal emulate board 220 corresponding to the terminal group of the target microprocessor in the case of output. In such case, exchange from the internal bus 210 of a personal computer 230 to a system bus 200 is performed through a bus exchanger 221 and the content of the register 222 is outputted through the bus 200. In the case of input, on the other hand, data of the bus 200 are stored in the register 222 through the exchanger 221 by actuating a bus cycle and necessary part of the register 222 is read out. In such way, an instruction code is fetched, decoded, and the instruction is executed so as to emulate the target micro device in the same way as that to the target microprocessor.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a development method for a software development support system for a processor, particularly when developing a microprocessor.

(Conventional technology) Conventional in-circuit emulator (In-circuit emulator)
The development of software development support systems (hereinafter referred to as development support systems) for microprocessors such as tEmulator (hereinafter abbreviated as rlcEJ), compilers, assemblers, etc. is carried out after the microprocessor has already been developed, or If a microprocessor is under development, it was done using a breadboard machine with functions equivalent to the microprocessor using TTL or an existing processor, or a simulator of the microprocessor on a mainframe. .

(Problems to be Solved by the Invention) The development of the conventional development support system described above had the following drawbacks.

First, a development support system is developed after the microprocessor is developed, but in this case, the development support system is shipped quite late after the microprocessor is shipped. Therefore, the actual development of the user system ends up waiting for the development support system, which delays the commercialization of the user's product.

In addition, regarding the development of a development support system using a breadboard machine, it is quite difficult to make a breadboard itself, as modern microprocessors are packed with as many as several million transistors per microprocessor. Moreover, it takes a considerable amount of time and money to create it.

Next is the development of a development support system using a simulator on the mainframe, but it takes a considerable amount of machine time to perform all the tests, which means it costs a lot of money, and the turnaround time is also quite poor, so it takes a long time. . Furthermore, in the development of hardware such as ICE, it is necessary to simulate a hardware environment other than a microprocessor, and the simulator itself becomes quite large-scale, making it quite difficult to implement.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the problems caused by the conventional development method of a software development support system for a microprocessor, and to provide an inexpensive and efficient method for developing a software development support system.

(Means for solving the problem) According to the present invention, when developing a microprocessor,
central processing unit, memory, secondary storage, i/.

A software development support system for the microprocessor is provided before the development of the microprocessor, wherein the system includes means having terminal functions equivalent to that of the microprocessor and means having instruction functions equivalent to the microprocessor. A software development support system development method that enables the development of software development is obtained.

(Example) Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention. /o0 is a personal computer with memory, secondary storage, and ILO, /o1 is a board that realizes terminal functions equivalent to the microprocessor used in Targetera 1-, /o2 is a system bus, /o3 is a target machine, /o4 is ICE, /o
5 indicates the ICE host machine.

Figure 2 is a microprocessor alternative to Figure 1.
/o0. It is a detailed diagram of /o1. 200 is a system bus, 2/o is a personal computer internal bus, 2
20 is a board that realizes the same terminal function as the target microprocessor, 221 is a bus exchanger between the personal computer internal bus and the system bus, and 222 is used to latch data on the terminals that are equivalent to the target microprocessor. A group of registers, 230 a personal computer, 231 a CPU section, 232 a memory section,
233 is a secondary storage section, and 234 is an i/0 section.

This embodiment emulates the target microprocessor by adding a board (hereinafter referred to as a terminal emulation board) that realizes the same terminal functions as the target microprocessor /o1 to an inexpensive personal computer /o0. It is something.

The emulated portion of the target microprocessor will be explained with reference to FIG. The personal computer 230 includes a CPυ section 231, a memory section 232, a secondary storage section 233, and an I/O section 234.

On this personal computer, a program that simulates the instructions of the target microprocessor (hereinafter referred to as an instruction simulator) and a program that accesses the target machine's memory, ilo, through the 220 terminal emulation board (hereinafter referred to as a bus simulator) are realized. . Actually, the instruction simulator and bus simulator are loaded into the memory section 232 from the secondary storage section 233. For memory and I/O access of the target machine, in the case of output, data is stored in a register group (hereinafter referred to as a terminal register) corresponding to a terminal group of the target microprocessor 222, and data is stored in a register group (hereinafter referred to as a terminal register) corresponding to a terminal group of the target microprocessor 222, and is accessed via the personal computer internal bus 2/o and the system bus. 200 conversions through bus exchanger 221, terminal register 2
This is done by outputting the contents of 22 to the system bus,
In the case of input, a bus cycle is started, data on the system bus is passed through the bus exchanger 221, and the data is transferred to the terminal register 22.
2 and reading the necessary terminal register 222. The above instruction simulator, path simulator, and terminal emulation board 222 of 222 are used to process instruction codes, decode instruction codes, and execute instructions in the same manner as the Tarp-Soto microprocessor. emulate. At this time, some information may be output to the screen of the personal computer through the I/O section 234.

As described above, by realizing the target microprocessor emulation section using the personal computer/o port and the terminal emulation board/o1, ICE, which is a hardware and software debugging tool, can be used.
/o4 development, operating system development on the target machine /o3, and inspection of machine language output from languages such as compilers and assemblers. The operating system can be developed using only a personal computer/o0, a target microprocessor emulation section using a terminal emulation board/o1, and a target machine/o3, or an ICE host/o5 for an ICE/o4 may be added. good.

(Effects of the Invention) As explained above, the present invention realizes a microprocessor emulator on an inexpensive personal computer, thereby making it possible to prepare a large number of emulator machines at a low cost when developing the microprocessor, and to emulate instruction emulators. Since the rate section is realized by software, changes in the microprocessor instruction specifications can be easily followed, which has the effect of allowing software and hardware for the microprocessor software development support system to be developed quickly and at low cost. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a detailed diagram of a microprocessor replacement section. In the figure, /o0... Personal computer /o1... A board that realizes the same terminal function as a microprocessor (terminal emulator 1 board) /o2... System bus /o3... Targetera 1-
Machine /o4...ICE /o5...ICE host machine 20G...System bus 2/o...Personal computer internal bus 220.
... A board that realizes the same terminal function as a microprocessor (terminal emulation board) 221 ... Bus exchanger between the personal computer internal bus and the system bus 222 ... Latch data on terminals equivalent to a microprocessor Register group (terminal register) 230...Personal computer 231...CPU section 232...Memory section 2
33...Secondary storage unit 234...I/O unit, respectively.

Claims (1)

[Claims] 1. When developing a microprocessor, a system that includes a central processing unit, memory, secondary storage, and I/O means,
A software development support system development method comprising: means having a terminal function equivalent to that of the microprocessor; and means having an instruction function equivalent to that of the microprocessor.