Semiconductor integrated circuit

Details Semiconductor integrated circuit Semiconductor integrated circuit

2004-07-21

2008-08-12

Perveen, Rehana (Department: 2116)

Electrical computers and digital processing systems: support

Synchronization of clock or timing signals, data, or pulses

Using delay

Reexamination Certificate

active

07412616

ABSTRACT:
A memory interface circuit is connectable to a DDR-SDRAM which outputs read data in synchronization with a data strobe signal together with the data strobe signal. A clock generator generates internal clock signals and memory clock signals supplied to the DDR-SDRAM. The memory interface circuit determines a delay of arrival of the data strobe signal relative to the corresponding internal clock signal by using a data strobe signal inputted in a read cycle with respect to the DDR-SDRAM, samples the arrived read data, based on a signal obtained by shifting the phase of the arrived data strobe signal, and synchronizes the sampled read data to the corresponding internal clock signal on the basis of the result of determination of the arrival delay.

REFERENCES:
patent: 6529993 (2003-03-01), Rogers et al.
patent: 6643732 (2003-11-01), Shih
patent: 6707723 (2004-03-01), Jeong
patent: 6760856 (2004-07-01), Borkenhagen et al.
patent: 2001-014213 (2001-01-01), None

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