Semiconductor memory device capable of concurrently diagnosing a plurality of memory banks and method thereof
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Dec 31, 2002
Grant Date -
Apr 26, 2001
app pub date -
Dec 7, 2000
filing date -
Dec 8, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A memory diagnostic circuit includes: a diagnostic circuit which sets a plurality of memory banks to an access/enable state at one time, writes predetermined common data into the memory banks, and parallelly reads out storage data of the plurality of memory banks; a comparison circuit which compares the data read out from the plurality of memory banks with the data written into the memory banks; and a discrimination circuit which discriminates whether or not there is any defect in the plurality of memory banks based on a comparison result.
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