Programmable DQS preamble

Details Programmable DQS preamble Programmable DQS preamble

2008-03-25

2008-03-25

Nguyen, Viet Q. (Department: 2827)

Static information storage and retrieval

Read/write circuit

Signals

C365S189070, C365S194000, C365S233100

Reexamination Certificate

active

11216489

ABSTRACT:
A method and apparatus for programming a data strobe (DQS) preamble in a memory by loading a defined set of bits into one or more registers of the memory, where one or more bits are formatted specifically for enabling the data strobe preamble. At least one of the bits is used to enable a data strobe preamble as either a default data strobe preamble of the memory or as a reduced data strobe preamble with a time length set equal to a fraction of the default preamble or a fraction of a clock cycle. The enabling bit can be used to provide a input for generating a delay that provides a delayed signal to drivers of the memory for producing a reduced data strobe preamble and for sequencing or driving data to be read out of the memory. The reduced data strobe preamble can also be used for writing data into the memory.

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