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US 2002/0172080 A1Published application
Propagation delay independent sdram data capture device and method
AssigneeKoninklijke Philips Electronics N.V.
InventorDennis Koutsoures
Life of this patent
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Abstract
A method of indicating data availability is disclosed. According to the method a data read operation is commenced for retrieving data signals based on data stored within an SDRAM. The data is provided from the SDRAM device with a first propagation delay. The SDRAM device also provides a strobe signal having a propagation delay similar to the first propagation delay. Based on the strobe signal data is latched out of the SDRAM device, as it is available to be read.
Claims5
A method of indicating data availability comprising the steps of:
- commencing a data read operation for retrieving data signals based on data stored within a memory storage the data signals having a first propagation delay;
- providing a strobe signal having a propagation delay similar to the first data propagation delay from the memory device to an external circuit and returning to the memory device;
- and
- indicating data availability based on the returned strobe signal, wherein the returned signal, in response to manufacturing and environmental changes, is affected similarly to the retrieved data signals.
1 more element
A memory integrated circuit comprising:
- a memory storage;
- a plurality of data ports;
- a circuit for providing data signals of data read from within the memory storage to the plurality of data ports;
- a first strobe port;
- a circuit for providing a strobe signal to a circuit external the memory integrated circuit via the first strobe port, the strobe signal having similar delays to the provided data signals;
- a second strobe port;
- a circuit for receiving a returned strobe signal from a circuit external the memory integrated circuit via the second strobe port, the returned signal having a predetermined temporal relation to data availability of data retrieved from the memory storage,
- wherein in use the returned signal, in response to manufacturing and environmental changes, is affected similarly to the data signals.
5 more elements
Dependencies are inferred from the claim text.