JPH04243086A - Storage device - Google Patents

Abstract

PURPOSE:To decrease the number of writing operations for writing the information in a DRAM at a specified value by making the request for setting a memory section at a test mode from the outside. CONSTITUTION:A memory control section 10 can read and write data out of and into the memory section 20 by the reading out request and the writing request. The memory section 20 has plural bit parallel test functions. A request means makes the request for setting the memory section 20 at the test mode from the outside. The number of the write operations for writing the information in the DRAM at a specific value is decreased in this way.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage device.

0002

2. Description of the Related Art Conventionally, in this type of storage device, when writing information in a DRAM to a constant value, in other words, a write operation such as memory clearing is performed by writing an address of a DRAM, for example, an IMD.
It is necessary to perform this process 220 times (=1048576 times) in RAM. In addition, in the storage device, this amount has been multiplied many times depending on the BANK configuration and the implementation of expansion units.

0003

[Problems to be Solved by the Invention] In the conventional storage device described above, when writing information in DRAM to a constant value, that is, write operations such as memory clearing are performed 220 times (=1048576 times) for the address of DRAM, for example, in the case of IMDRAM. There is a need. Moreover, this amount can be multiplied many times depending on the BANK configuration and the implementation of expansion units, so there is a drawback that it takes an enormous amount of time just to write.

0004

[Means for Solving the Problems] A storage device of the present invention includes a memory control unit that can read and write data from a memory unit in response to a read request and a write request;
It has a memory section having a multi-bit parallel test function, and a request means that can issue a request to set the memory section to a test mode from the outside.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. The memory control unit 10 receives the test mode request signal 40
When receiving 0, it outputs a control signal 500 for setting the test mode to the memory section 20. After that, the memory section 20
The operation is in a multi-bit parallel test state, and at the time of a write request, the memory control unit 10 receives the address signal 100, data signal 200, and control signal 300, and outputs a write-related control signal 500 to the memory unit 20.

[0007] This is the same as normal operation when the test mode is not set. This allows multiple bits to be written in parallel. When a request to reset the test mode is received, a control signal 500 for resetting the test mode is output to the memory section 20, and the process ends.

[0008]

[Effects of the Invention] The storage device of the present invention is useful for writing information in DRAM to a constant value (i.e., memory clearing, etc.)
This has the effect of reducing the number of write operations and time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention.

[Explanation of symbols]

10 Memory control section 20 Memory section 100 Address signal 200 Data signal 300 Control signal 400 Test mode request signal 500 Control signal

Claims (1)

[Claims] 1. A memory control unit that can read and write data from a memory unit in response to a read request and a write request, a memory unit that has a multi-bit parallel test function, and a memory unit that can set the memory unit to a test mode. 1. A storage device comprising a request means that can make a request from outside.