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US 6,715,096 B2Granted
Interface circuit device for performing data sampling at optimum strobe timing by using stored data window information to determine the strobe timing
AssigneeRenesas Technology Corp.
InventorShigehiro Kuge
Life of this patent
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Abstract
An interface unit includes a timing control circuit for extracting an effective data window by detecting a point of change in a transferred data, and determining strobe timing for taking in the data in accordance with the extracted effective window; and a strobe clock generating circuit for generating a strobe clock signal for taking in the data under control of the timing control circuit. Regardless of the system structure, accurate data transfer is achieved between any semiconductor devices in the system.
Claims29
An interface circuit comprising:
- production/storage circuitry for detecting a point of change in data on a data line, producing effective window information indicating an effective period of said data in accordance with a result of detection, and storing said effective window information;
- strobe timing determining circuitry for determining a strobe timing for taking in data on said data line in accordance with the effective window information stored in said production/storage circuitry;
- and
- clock producing circuitry for producing a clock signal for taking in the data on said data line in accordance with the strobe timing determined by said strobe timing determining circuitry.
1 more element
An interface circuit comprising:
- transition point detecting circuitry for detecting a point of transition in data on a data line;
- producing circuitry for producing effective window information indicating an effective period of said data in accordance with the point of transition detected by said transition point detecting circuitry;
- determining circuitry for determining whether a width of said effective window satisfies a first condition;
- and
- storage circuitry for storing an address and a data pattern of said data when said determining circuitry determines that said first condition is satisfied.
2 more elements
An interface circuit comprising:
- effective window extracting circuitry for detecting a point of change in data on a data line, and producing an effective window signal indicating an effective period of said data in accordance with a result of the detection;
- effective window width detecting circuitry for detecting an effective period width of said effective window signal using a reference clock signal, and storing a result of the detection;
- strobe timing storing circuitry for determining a strobe timing for said data from the effective window width information detected by said effective window width detecting circuitry, and storing the determined strobe timing;
- and
- strobe signal producing circuitry for producing a strobe signal for the data on said data line in accordance with the strobe timing stored in said strobe timing storing circuitry.
2 more elements
Dependencies are inferred from the claim text.