Memory testing method and apparatus, and computer-readable recording medium
AssigneeFujitsu Limited
InventorNoriyuki Matsui
Life of this patent
Estimating the term…
Abstract
A memory testing method tests a memory by writing test data to and reading test data from the memory. Data is successively read from the memory is synchronism with a clock and the data is compared. The memory testing method then judges a defect in the memory based on a result of the comparison.
Claims15
A method for testing a memory by writing test data to and reading the test data from the memory, comprising the steps of:
- (a) designating a predetermined sequence of a data of the test data for writing to the memory;
- (b) out of data successively read from the memory in synchronism with a clock, comparing pairs of data consecutively read from adjacent addresses of the memory as an anticipated data;
- and
- (c) judging a defect in the memory based on a result of a comparison made in step (b) in consideration of the predetermined sequence in step (a).
A memory testing apparatus comprising:
- writing and reading means for writing a designated sequence of test data to and reading the test data from the memory;
- comparing means for comparing pairs of data consecutively read from adjacent addresses of the memory as an anticipated data, out of data successively read from the memory by said writing and reading means in synchronism with a clock, and outputting a comparison result;
- and
- judging means for judging whether or not the memory is defective based on the comparison result obtained from said comparing means and in consideration of the designated sequence of test data.
A computer-readable recording medium which stores a program for causing a computer to test a memory by writing a designated sequence of test data to and reading test data from the memory, said computer-readable recording medium comprising:
- means for causing the computer to compare pairs of data consecutively read from adjacent addresses of the memory as an anticipated data, out of data successively read from the memory in synchronism with a clock, and outputting a comparison result;
- and
- means for causing the computer to judge whether or not the memory is defective based on the comparison result and in consideration of the designated sequence of test data.
A memory testing method for testing a memory by writing test data to and reading the test data from the memory, comprising:
- successively reading data from the memory in synchronism with a clock;
- making a comparison by comparing two data which are consecutively read from the memory by using one of the two data as an anticipated data;
- and
- judging a defect in the memory based on a result of the comparison.
A memory testing apparatus comprising:
- a writing and reading section writing test data to and reading the test data from the memory;
- a comparing section comparing two data which are consecutively read from the memory by said writing and reading section, using one of the two data as an anticipated data;
- and
- (a) designating a predetermined sequence of a data of the test data for writing to the memory;
- (b) out of data successively read from the memory in synchronism with a clock, comparing pairs of data consecutively read from adjacent addresses of the memory as an anticipated data;
- and
- (c) judging a defect in the memory based on a result of a comparison made in said step (b) in consideration of the predetermined sequence in step (a).
A computer-readable recording medium which stores a program for causing a computer to test a memory by writing test data to and reading the test data from the memory, said program comprising:
- a procedure which causes the computer to successively read data from the memory in synchronism with a clock;
- a procedure which causes the computer to make a comparison by comparing two data which are consecutively read from the memory by using one of the two data as an anticipated data;
- and
- a procedure which causes the computer to judge a defect in the memory based on a result of the comparison.
Dependencies are inferred from the claim text.