JPH02161684A - Method for judging package of read only memory - Google Patents

Abstract

PURPOSE:To judge the package of a user table ROM by instructing this address of the user table ROM, and reading set data corresponding to the address. CONSTITUTION:A package judging processing for a table ROM 3 classified by user is performed by setting an I/O address in OUTPUT, and by performing data input to the table ROM 3 classified by user in INPUT by data inputted/ outputted in an I/O device image from a CPU 1 by a ROM device processing part 2. Also, bus control at the time of opening an I/O address bus 9 is performed by a pull-up resistor 4. Then, information required for the judgement of the package of the table ROM 3 classified by user is delivered to a software side(CPU program processing). In such a way, it is possible to easily read the user table and to simplify the judgement for the package of the user ROM 3 based on the content of the table.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a ROM (read only memory) for user-specific tables when setting user-specific tables in a processing device such as a telemeter device that performs data processing by program processing. The present invention relates to a mounting state determination method.

[Prior art]

Conventionally, user-specific table data in this type of processing device is placed on the same address as the system (processing program) ROM, and the user-specific table data and processing program are set separately based on address correspondence. When using data, a corresponding address is set, and the necessary data is read and used.

[Problem to be solved by the invention]

However, in the conventional processing method described above, when the system (processing program) becomes large and uses a large amount of address area, the table address area becomes small and it becomes necessary to downsize the processing program or change the table structure. Otherwise, in order to expand the address space, it was necessary to use a bank switching method to switch banks on the hardware.6 As a result, the 8-1 card (circuit) became more complex and the software needed to be redesigned12. There was a problem with it.

The present invention has been made in view of the above-mentioned points, and eliminates the conventional problems of complication of hardware + redesign of software, allows easy reading of user data, and allows implementation of user ROM by its contents. An object of the present invention is to provide a read-only memory implementation determination method that allows easy determination.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a table data reading means in a processing device and a method for determining the implementation of a knee-the-ROM by determining the data read by the table data reading means. Instead of the conventional method of reading ROM data using address control, we use a method of reading user ROM as an input/output image, and also read different data depending on whether the ROM is installed or not installed on the data bus so that it can be determined whether the ROM is installed or not. A circuit is provided, and the content of the data read in the user double ROM is determined by the circuit. It is characterized by:

[Effect]

By performing the node-only memory implementation determination method as described above, it is possible to determine whether the user table ROM is installed by specifying the device address of the user table ROM and reading the setting f-2 corresponding to that address.
System addresses can be used effectively, the processing program and the user table ROM can be easily distinguished, and processing problems such as runaway processing and stoppage that occur when processing is executed using the table section as a processing program can be avoided. It can be avoided.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1(a) is a block diagram showing the system configuration of a processing device necessary to implement the ROM mounting determination method according to the present invention, and FIG. 1(b) shows the configuration of one bit of the I10 address bus line. It is a diagram. As shown in the figure, the processing device includes a CPUI, ROM device processing sections 2, 2, user table ROM 3, and system ROM 5, which are connected by a data bus 6, a control line 7.8, and an I10 address bus 9. .

The CPU performs system program processing and processing for determining the installation of the user-specific table ROM3, but in the installation determination process for the user-specific table ROM3, the ROM device processing unit 2 performs INPUTloUTPUT from cPU1 using the I10 device image.
Necessary processing (I10 address setting for OUTPUT,
At INPUT, data is input into the user-specific table ROM 3). It only controls the user table ROM 3 (I10 address instruction) and relays data input processing. Also, due to the pull-up resistor 4, I1
0 When address bus 9 (becomes a data bus during INPUT) is open (user-specific table ROM 3 is not installed)
bus control (H4gh level = CPU input “1’)
), and the information necessary for determining the implementation of the user-specific table ROM3 is passed to the software side (CPU program processing) [7
, create a user-specific table R using program processing based on that information.
Performs OM3 implementation determination.

FIG. 2 is a flowchart showing the flow of this user-specific table ROM installation determination process.

In FIG. 2, first, by I10 processing on the CPUI,
Performs user ROM address setting processing necessary to perform ROM device processing for the user-specific table ROM 3 (step 1゜1), and the ROM device processing section 2
Address data is output to the address data using 0UTPUT processing, and a ROM device address is set (steps 1 and 2). After setting this ROM device address, the user RO
The M data is subjected to INPUT processing, and user ROM installation determination data for determining the installation of the user-specific table ROM3 is input (step 103). In this case, as a general rule, the ROM mounting determination address is set to address 0''.Therefore, the table data at address 0 is assumed to be a table without the setting of FFH''. Next, the user-specific table ROM3 is subjected to implementation determination processing based on the input determination data (step 104), and the presence or absence of implementation is determined, and based on the result, the RO
Setting process of user-specific table ROM3 by M implementation (
Step 105) or the setting process of the user-specific table ROM3 due to the ROM not being installed (step 106),
Return to general processing.

Regarding implementation determination, since input data is High (FFM) regardless of the user ROM address when it is not installed, implementation determination is performed based on the data.

〔Effect of the invention〕

As explained above, according to the present invention, the user table R
Since the installation of the user table ROM can be determined by specifying the OM dis-address and reading the setting data corresponding to that address, the system address can be used effectively, and the processing program and user
This provides an excellent effect in that it is possible to easily distinguish between M and to avoid processing troubles such as processing runaway and stoppage that occur when processing is performed using the table section as a processing program.

In addition, since the processing itself is programmed, an excellent effect can be obtained in that it can be applied to a processing device using a separate ROM without the need for complicating the hardware or redesigning the software.

[Brief explanation of the drawing]

FIG. 1(a) is a block diagram showing the system configuration of a processing device for implementing the ROM mounting determination method according to the present invention;
FIG. 2B is a diagram showing the configuration of one bit of the I10 address bus line, and FIG. 2 is a 4-yard diagram showing the flow of the mounting determination process for this user-specific table ROM. In the figure, 1... CPU, 2... ROM device processing unit, 3... user-specific table ROM, 4...
Pull-up resistor, 5... System ROM, 6...
・Data bus, 7.8...Control line, 9...
Engineering 10 address bus.

Claims (1)

[Claims] A read-only memory implementation determination method includes a data reading means and determines read-only memory implementation based on determination of the read data, the read-only memory device processing circuit comprising: a read-only memory device processing circuit; To access read-only memory, set a read-only memory address during output processing as an input/output device, input read-only memory data during input processing as an input/output device, and depending on the contents, read-only memory may be implemented or unimplemented. A read-only memory implementation determination method characterized by determining.