Method and device for masking ringing in a DDR SDRAM

Details Method and device for masking ringing in a DDR SDRAM Method and device for masking ringing in a DDR SDRAM

2006-11-28

2006-11-28

Peugh, Brian R. (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Access timing

C365S233100

Reexamination Certificate

active

07143258

ABSTRACT:
A DDR SDRAM operates at a double data rate by accessing the bursts of data having a burst length in accordance with the rising and falling edges of each pulse of a DQS signal. A ringing may occur in the DQS signal causing write failures. To mask the ringing, a DQS buffer generates a first access signal at the rising edge of each DQS pulse generated in presence of the data burst. The DQS buffer also generates a second access signal at the falling edge of each DQS pulse. Each of the first and second access signals includes a finite number of pulses based on the total number of rising and falling edges of the DQS signal. Two consecutive data bursts are accessed together for a write operation for each pair of the consecutive first and second access signals. After accessing all data bursts, a mask time is calculated to disable the DQS buffer, by which the ringing is masked.

REFERENCES:
patent: 6134179 (2000-10-01), Ooishi
patent: 6560669 (2003-05-01), Ryan
patent: 2004/0052151 (2004-03-01), Jacobs et al.
patent: 2004/0268028 (2004-12-01), Lee
patent: 2005002521 (2005-06-01), None

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