JPH0289296A - Nonvolatile memory circuit - Google Patents

Abstract

PURPOSE:To shorten the initialization time of a nonvolatile part by writing data to be written in the nonvolatile part into an ROM part and switching to whether the data of an RAM part are written into the nonvolatile part or whether the data of an ROM part are written into the nonvolatile part. CONSTITUTION:This circuit is constituted of an RAM part 13, nonvolatile part 16, control part 17, ROM part 14 and a switching circuit 15. This RAM part 13 holds data by an ordinary access and the nonvolatile part 16 holds the data when power source is cut off. A control 17 controls the read/write of the data of the RAM part 13 and the nonvolatile part 16 by an external control and the ROM part 14 previously writes the data to be written into the nonvolatile part 16. The switching circuit 15 switches to whether the data of the RAM part 13 are written into the nonvolatile part 16 or whether the data of the ROM part 14 are written into the nonvolatile part. Thus, the data can be easily and shortly written into the nonvolatile part 16.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is concerned with improving non-volatile memory circuits, and particularly relates to writing data into the non-volatile portion thereof.

(Prior art) Conventionally, this type of non-volatile memory has the following characteristics, as shown in FIG.
A data buffer 21, a controller unit 22, an address buffer 23, and a RAM unit 2 for storing data through normal access; I am loved for my preparation. The control unit 22 controls the RA by external control.
It controls data writing and output between the M section 24 and the non-volatile section 25.

When writing data to the non-volatile part 2S, first write the 4 constant address VCill:pressure data on the RAM part 2 through the processor for controlling the non-volatile memory, and then write the data to the external user:@l. Data t- to non-volatile section 25
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When using the data again after the source has been input,
Due to external control, data from source 25 was transferred to RAM section 2, upper 4!, F included, and data from RAM section 24 was used by the processor.

(The invention is about to end.iii'+:!) In the conventional non-volatile memory described above, data cannot be written to the non-volatile part from anything other than the RAM part, so the initial data is not stored in the non-volatile part. When writing, it is necessary to sequentially write data to specified addresses in the RAM section through a processor that accesses the nonvolatile memory, and then write the data to the nonvolatile section.

Therefore, there is a drawback that it takes a long time to initialize the nonvolatile part.

An object of the present invention is to write data to be written into a non-volatile part by RO
In addition to writing to the M section, the data in the RAM section is
A non-volatile memory configured to eliminate the above-mentioned drawbacks and shorten the initialization time of the non-volatile part by switching between writing to the volatile part or writing data from the ROM part to the non-volatile part. The purpose is to provide circuits.

(Section!+Li-Means for Solving) A non-volatile memory circuit according to the present invention includes a RAM section, a non-volatile section, a control section, a ROM section, and a switching circuit.

The RAM section is for holding data during normal access, and the non-volatile section is for holding data when the power is turned off.

The control section is a part that controls writing/reading of data in the RAM section and the nonvolatile section by external control.

The ROM section is for writing data to be written into the non-volatile section in advance.

The switching circuit is for switching between writing data in the RAM section to the nonvolatile section or writing data in the ROM section to the nonvolatile section.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of a nonvolatile memory circuit according to the present invention.

In FIG. 1, 11 is an address buffer, 12 is a data buffer, 13 is a RAM section, 14 is a ROM section, 1S is a switching circuit, 16 is a nonvolatile section, and 1F is a control section.

The ROM 14 writes initial data to be written into the non-volatile section 16, and the switching circuit 15 determines whether to write the data in the RAM section 13 to the non-volatile section 16 or the data in the ROM 14 to the non-volatile section 16. control the flow of data.

The control unit 17 performs normal access and the R of the festival.
Read/write 1j@ to AM section 13, write control signal of initial data to 80M section 14, RAM by external signal
Non-volatile part 1 of data to part 13 or 80M part 14
It generates a write control @ signal for writing to the RAM section 6 and a signal for reading the data from the non-volatile section 16 to the RAM section 13.

When writing the initialization data of the nonvolatile section 16 to the ROMrff 114, set the switching circuit 1S to the ROM 14 side, access the control section 17, and write the initialization data to the nonvolatile section 16. .

When accessing the control section 17 and reading the data of the non-starting section 16 into the RAM section 13, the switching circuit 1S is set to the RAMI 3 side, and the data of the RAM g13 is read/loaded.

After that, when loading data into the non-volatile section 16, the switching circuit 15 is set to the RAM 13 side, so
Data in the RAM section 13 is written to the nonvolatile section 16.

After that, 1! Even when the power is turned off and then turned on again, the data in the non-volatile section 16 can be read into the RAM section 1 by accessing the control section 1.

If the data in the non-volatile section 16 is destroyed during the process, or if no effort is made to restore the initialized data, the switching circuit 15
is switched to the ROM 14 side, the data in the 80M section 14 is written to the nonvolatile section 16, and is read out to the RAM section 13.

By using the 80M section 14 as an electrically rewritable memory such as an E PROM, data can be changed by a program.
Including the use of PROMs.

(Effects of the Invention) As explained above, the present invention allows data to be written to a non-volatile memory. This switching has the effect that data can be easily written to the non-volatile part within a short period of time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a nonvolatile memory circuit according to the present invention. FIG. 2 is a block diagram showing an example of a nonvolatile memory circuit according to the prior art. 11.22...Address buffer 12.21...Data buffer 13.23...RAM section 14...ROM section 15...Switching mode 16.24...Non-volatile section 17.25...・Control section

Claims (1)

[Claims] A RAM section for holding data through normal access, a non-volatile section for holding the data when the power is turned off, and external control to control data writing/reading between the RAM section and the non-volatile section. a ROM section for writing data to be written into the non-volatile section in advance; 1. A nonvolatile memory circuit comprising a switching circuit for switching whether to write to a nonvolatile part.