JPH01112334A - Controller - Google Patents

Abstract

PURPOSE:To use a control board used in common corresponding to a various kinds of application or grade-up commonly even when the same software is used by providing a ROM/RAM operation switching circuit. CONSTITUTION:On the control board 1 used in common, a system ROM 7 having a program transfer and a program execution functions, a RAM 8, and the ROM/RAM operation switching circuit 6 are provided. System software at the control board 2 side prepared at every kind of application in the system RAM 8 on the control board 1 is written by a system ROM operation, and after that, an operation can be switched from the system ROM operation to a system RAM operation by a command from the control board 2 at the ROM/ RAM operation switching circuit 6. In such a way, it is possible to use the control board 1 corresponding to the various kinds of application or grade-up even when the same software of the control board 1 used commonly is used.

Description

[Detailed Description of the Invention] [Technical Field 1] The present invention relates to a system that combines two control boards 1' into a pair.
This relates to a controller that performs two operations.

[Background Art 1] As a form of a controller using a microcomputer used in a control device, etc., there is a configuration in which a pair of two control boards 1 and 2 perform one operation, as shown in FIG.

For example, when this controller is a communication I/F board using a microcomputer, such a configuration is often adopted. For example, the control board 1 is commonly used, and the control boards 2 are prepared for various uses. These system software are fixed in the ROM 3.4 of each control board 1, 2.

In such a controller, it is necessary to prepare two ROMs 1.2 each for various purposes, and when upgrading the system functions, it is also necessary to prepare two ROMs 1.2 each for each purpose.
Change and Burno Yon ¥! It is necessary to do the following. In other words, the control board 1 as a common board has the same hardware but different software, so it is necessary to prepare ROMIs according to various uses. Therefore, with such a controller, there is a problem in that the management of product types becomes complicated.

[Objective of the Invention 1 The present invention has been made in view of the above-mentioned points, and its purpose is to use a commonly used control board for various purposes or for different purposes even if the software of the commonly used control board is the same. It is an object of the present invention to provide a controller that can be used in common in response to improved functions.

[Disclosure of the Invention] (Configuration) The present invention provides a controller in which two control boards are paired to perform one operation, and the commonly used control board includes a system ROM having a program transfer and program execution function, and an application. A system RAM to which programs related to system software are transferred from other control boards prepared according to the system, an I/F unit that exchanges data between the other control boards, and a system to the system RAM. It is equipped with a ROM/RAM operation switching circuit that switches from system ROM operation to system RAM operation in response to a command from another control board input via the I/F section after transferring a program related to software. The control board side system software prepared for each type of use is written into the system RAM of the control board used for the system by system ROM operation, and then the system is written to the ROM/E<AM operation switching circuit by commands from other control boards. By switching from ROM operation to System 11A M operation, even if the software of the commonly used control board is the same, the commonly used control board can be used in common for various purposes or for 7 functions. This is how it was done.

(Example) An embodiment of the present invention is shown in FIGS. 1 and 2. FIG.

The CPU 5 of the control board 1 of this embodiment is as follows:
An Intel one-chip microcomputer (for example, 8031) is used. In this embodiment, as shown in FIG. 1, a commonly used control board 1 includes a system ROM 7 having program transfer and program execution functions;
Other control boards 2 prepared according to usage etc.
(C) It includes a system RAM 8 to which a program related to system software is transferred, and a work RAM 9 used to cause the system RAM 8 to execute the program in a software manner after the program related to system software is transferred to the system RAM 8. The control board 1 also includes an I/F unit 10 for exchanging data between other control boards 2, and commands from other control boards 2 are input via this 1/F unit 10. This allows the control board to control whether to operate the system RAM or the system RAM. Note that this I/F unit 10 is composed of a shared memory, a FIFO memory, and the like. Further, after the program related to the system software is transferred to the system RAM 8, the control board 26 controls the system ROM and the system RAM 8 by hardware to switch the control board 1 from system ROM operation to system RAM operation. A ROM/RAM operation switching circuit 6 is provided. In addition to the above-mentioned components, the control board 1 includes an I/F section 12 used for a specific purpose.

The operation of this embodiment will be explained below. In this embodiment, when the power is turned on after reset, the output enable terminal OE of the ROM/RAM switching circuit 6 outputs a signal PS, which is a signal for reading the program area (code area).
An EN signal is output, and a read signal RD for reading the data area is output from the output enable terminal OE2. Therefore, after the power is turned on, the program is executed based on the contents of the system ROM 7. At this time, system RO
A program related to the system software of the control board 2 is transferred to the system RAM 8 via the I/F unit 10 by the program 2 of the M7. When the transfer of this program is completed, the operation is switched to ROM/RAM operation. The ROM/RAM operation switching circuit 6 has a second
It has the configuration shown in the figure, and by writing "1" to the input Do of the D7 block 70 block 13, the NOR circuit 1
From 4 to 19! Through the pI switching circuit, output signal is output, that is, the control board IgA is hardware-wise switched from system ROM operation to system RAM operation.
Switch to driving. Then, in order to actually start the system RAM operation in terms of software, the system jumps to the start address in response to the jump to start address (JMP) command, which is an operation command from the control board 2 written in the work RAM 9. RAM operation is started. In order to switch from this system ROM operation to system RAM operation, the work RA
An example of a program written to M is shown below.

MOV DPTR, #Add, ...■MOV
A, $1...■MOVX @DPT
R, 1... ■ JMP 5tart add, -■ Note that Add is the address of the ROM/RAM operation switching circuit 6, and add is the start address of the system RAM operation. That is, "1" is written in Do of the ROM/RAM operation switching circuit 6 in steps (1) to (2) above, and the system ROM operation is switched from the system ROM operation to the system RAM operation in terms of hardware. That is, ■ to ■ are ROM/RAM operation switching commands. Then, the system RAM operation is started by jumping to the start address of the system RAM 8 at (■). Note that at this time, the system ROM area can be used as data. Further, in the above description, a case has been described in which the system ROM operation is switched to the system RAM operation, but the system ROM operation can also be maintained by a command from the other control board 2. At this time, the system RAM area is used as data. By the way, in the above explanation, we explained the case where an Intel CPU (8031) was used, but like other CPUs, the code RD
The present invention can also be applied to a case where the data RD is not separated into a data RD (PSEN in 8031) and a data RD. However, at this time, the situation is the same as when the PSEN signal is always at a high level.

[Effect of the Invention 1] As described above, the present invention includes a system ROM having a program transfer and program execution function on a commonly used control board, and programs related to system software from other control boards prepared according to the application. I/F that exchanges data between the system RAM to be transferred and the other control boards mentioned above.
After transferring the program related to the system software to the system RAM, the R controller switches from system ROM operation to system RAM operation in response to a command from another control board input via the I/F section.
Since it is equipped with an OM/RAM operation switching circuit, system software on the control board side used for various purposes is written to the system RAM of the commonly used control board by system ROM operation, and then it can be written from other control boards. It is possible to switch from system ROM operation to system RAM operation using the OM/RAM operation switching circuit with the command .This means that even if the software of the commonly used control board is the same, the commonly used control board can be used for various purposes or It has the advantage that it can be used in common in response to increased functionality, and therefore a flexible system can be constructed, and software management can also be handled on the other control board side.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a circuit diagram of an embodiment of the present invention.
A specific circuit diagram of the OM/RAM switching circuit, FIG. 3, is a schematic configuration diagram of a conventional example. 1.2 is the control board, 5 is the CPU, 6 is the ROM
7 is a system ROM, 8 is a system RAM, and 10 is an I/F section. Agent Patent Attorney Ishi 1) Chief 7 Figure 1 Figure 2 Figure 3 Procedural amendment (voluntary) 1. Indication of the case 1985 Patent IR No. 269575 2. Name of the invention Controller 3. Person making the amendment Case Relationship with Patent Applicant Address 1048 Kadoma, Kadoma City, Osaka Name (58
3) Matsushita Electric Works Co., Ltd. Representative: Sadao Fujii 4, Agent postal code: 530 Address: 1-12-17-5 Umeda, Kita-ku, Osaka City Date of amendment order: 6 Number of inventions increased by amendment: None 7. Specification subject to amendment 8. Contents of amendment [11 "Let" at the beginning of the 5th line of page 7 of the specification of the present application.
Correct it to "will be." [21 Same as above, page 8, mlo line [add, J to [5t
Artadd, correct J. Agent Patent Attorney Ishi 1) Choshichi

Claims (1)

[Claims] (1) In a controller that pairs two control boards to perform one operation, the commonly used control board includes a system ROM that has program transfer and program execution functions, and other controls prepared according to the purpose. A system RAM to which programs related to system software are transferred from the board, an I/F unit that exchanges data between the other control boards mentioned above, and an I/F section that transfers programs related to system software to the system RAM. 1. A controller comprising: a ROM/RAM operation switching circuit that switches from system ROM operation to system RAM operation in response to a command from another control board input via the /F unit.