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US 7,443,741 B2Granted
DQS strobe centering (data eye training) method
AssigneeLSI Corporation
InventorsDerrick Sai-Tang Butt, Hui-Yin Seto
Life of this patent
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Abstract
A method for calibrating a data valid window including the steps of: (A) setting a base delay of one or more datapaths to a predetermined value, (B) determining an optimum offset delay value for each of the one or more datapaths based upon actual memory accesses and (C) delaying a read data strobe signal based upon the base delay and the optimum offset delay value for each of the one or more datapaths.
Claims20
A method for calibrating a data valid window comprising the steps of:
- determining an optimum offset delay value for each of one or more datapaths based upon actual memory accesses, wherein determining said optimum offset delay value comprises averaging a maximum offset delay value and a minimum offset delay value of each of said one or more datapaths;
- and
- delaying a read data strobe signal based upon a base delay and said optimum offset delay value for each of said one or more datapaths.
An apparatus comprising:
- a first circuit configured to determine an optimum offset delay value for each of one or more datapaths based upon actual memory accesses, wherein said first circuit is further configured to average a maximum offset delay value and a minimum offset delay value for each of said one or more datapaths;
- and
- a second circuit configured to delay a data strobe signal based on a base delay and said optimum offset delay for each of said one or more datapaths.
A memory interface circuit comprising:
- means for determining an optimum offset delay value for each of one or more datapaths using actual memory accesses, wherein determining said optimum offset delay value comprises averaging a maximum offset delay value and a minimum offset delay value for each of said one or more datapaths;
- and
- means for delaying a read data strobe signal based on a base delay and said optimum offset delay for each of said one or more datapaths.
Dependencies are inferred from the claim text.