Programmable data strobe offset with DLL for double data...

Details Programmable data strobe offset with DLL for double data... Programmable data strobe offset with DLL for double data...

2005-09-06

2005-09-06

Lam, David (Department: 2827)

Static information storage and retrieval

Read/write circuit

Testing

C365S194000, C365S233100

Reexamination Certificate

active

06940768

ABSTRACT:
A double data rate (DDR) synchronous dynamic RAM (SDRAM), or DDR-SDRAM, memory controller employing a delay locked loop (DLL) circuit to delay an SDRAM data strobe (DQS) signal to the center, or ‘eye’ of the read data window. However, in distinction from conventional techniques, the initial delay determined by the DLL is fine tuned with an offset determined by a memory test. Moreover, in an additional embodiment, the delay may be further adjusted during operation to compensate for environmental conditions by a PVT (process, value, temperature) circuit.

REFERENCES:
patent: 6286077 (2001-09-01), Choi et al.
patent: 6327217 (2001-12-01), Chung
patent: 6330636 (2001-12-01), Bondurant et al.
patent: 6373301 (2002-04-01), Chen et al.
patent: 6426900 (2002-07-01), Maruyama et al.
patent: 6438067 (2002-08-01), Kuge et al.
patent: 6438670 (2002-08-01), McClannahan
patent: 6442102 (2002-08-01), Borkenhagen et al.
patent: 6453381 (2002-09-01), Yuan et al.
patent: 6484232 (2002-11-01), Olarig et al.
patent: 6487648 (2002-11-01), Hassoun
patent: 6529424 (2003-03-01), Koutsoures
patent: 6553452 (2003-04-01), Garlepp et al.
patent: 6553472 (2003-04-01), Yang et al.
patent: 6556489 (2003-04-01), Gomm et al.
patent: 6563747 (2003-05-01), Faue
patent: 6570815 (2003-05-01), Kashiwazaki
patent: 6581017 (2003-06-01), Zumkehr
patent: 6584578 (2003-06-01), Faue
patent: 2001/0054135 (2001-12-01), Matsuda
patent: 2002/0013881 (2002-01-01), Delp et al.
patent: 2002/0172079 (2002-11-01), Hargis et al.
patent: 2002/0178322 (2002-11-01), Gans et al.
patent: 2003/0001650 (2003-01-01), Cao et al.
patent: 2003/0005250 (2003-01-01), Johnson et al.
patent: 2003/0011414 (2003-01-01), Bell
patent: 2003/0070052 (2003-04-01), Lai
patent: 2003/0076712 (2003-04-01), Jang

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