Generating different delay ratios for a strobe delay

Details Generating different delay ratios for a strobe delay Generating different delay ratios for a strobe delay

2006-09-19

2006-09-19

Nguyen, Linh My (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S149000

Reexamination Certificate

active

07109767

ABSTRACT:
A digital delay-locked loop has been discovered having a reduced area as compared to typical register-controlled delay-locked loops (RDLLs) used to control strobe delay lines that provide delay to strobe signals driving asynchronous FIFOs. This result is achieved by reducing ratio computation (i.e. gear logic) circuitry of the RDLL. A master delay line receives a control code to delay a reference clock by one clock period. A slave delay line receives the control code to delay a strobe signal by a predetermined fraction of the clock period. The master delay line may include individual sections responsive to the control code which effectively delay a signal by a portion of the clock period, the delay having a fixed relationship to a delay associated with individual sections of the slave delay line.

REFERENCES:
patent: 6181168 (2001-01-01), Zarubinsky et al.
patent: 6289068 (2001-09-01), Hassoun et al.
patent: 6483871 (2002-11-01), Dawe
Satoshi Eto, et al., “A 1Gb SDRAM with Ground Level Precharged Bitline and Non-Boosted 2.1V Word Line,” IEEE International Solid-State Circuits Conference, 1998, pp. 82-83.
Atsushi Hatakeyama, et al., “A 256-Mb SDRAM Using a Register-Controlled Digital DLL,” IEEE Journal of Solid-State Circuits, vol. 32, No. 11, Nov. 1997, pp. 1728-1734.
Georgios Konstadinidis, et al., “Implementation of a Third-Generation 1.1GHz 64b Microprocessor,” ISSCC 2002, Feb. 6, 2002, 3 pages.
Feng Lin, et al., “A Register-Controlled Symmetrical DLL for Double-Data-Rate DRAM,” IEEE Journal of Solid-State Circuits, vol. 34, No. 4, Apr. 1999, pp. 565-568.
Kevin Ryan, “DDR SDRAM Functionality and Controller Read Data Capture,” DesignLine, vol. 8, Issue 3, 3rdQuarter 1999, pp. 1-24.

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