Method and apparatus for calibrating DQS qualification in a memory controller
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United States of America Patent
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Jul 29, 2003
Grant Date -
N/A
app pub date -
Jun 10, 2002
filing date -
Jun 10, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method an apparatus are provided for calibrating a mask signal which is used for masking a data strobe signal that is received from a memory device with read data. According to the method, one or more read operations are performed with the memory device, and the data strobe signal is sampled at a plurality of different time delays relative to a local clock signal to produce a plurality of data strobe sample values. The plurality of data strobe sample values are searched to identify a temporal location within a preamble phase of the data strobe sample values and one of the time delays that corresponds to the temporal location. A delay at which the mask signal is disabled in response to a read operation is then set relative to the local clock signal based on the time delay corresponding to the temporal location.
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