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DDR3 TDQS feature

Posted: 29 Oct 2008     Print Version  Bookmark and Share

Keywords:DDR3  termination data strobe  signal integrity 

To simplify memory controller design for systems that simultaneously use both x4-based and x8-based registered DIMMs, Micron DDR3 provides the termination data strobe (TDQS) function. DIMMs that are x8-based only require one DQ strobe pair (DQS/DQS#) for each 8bit byte; x4-based DIMMs require a DQS pair for each 4bit nibble (a total of four strobe lines). When these two different DIMM configurations are mixed within the same system, the loading of the DQS lines differs. These loading differences can cause signal integrity issues.

TDQS is similar to the RDQS function in DDR2. However, TDQS provides only termination. RDQS provides both termination and an output strobe.

This technical note from Micron provides guidelines for using the TDQS feature to reduce signal integrity issues associated with mismatched DQS loading in combined x4-based/x8-based systems.

View the PDF document for more information.





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