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DDR3 register input bus termination measurement

Posted: 28 Apr 2010     Print Version  Bookmark and Share

Keywords:DDR3 register input  bus termination  IBT resistors 

This application report demonstrates how to accurately measure input bus termination (IBT) resistors in a simple way using the Texas Instruments Register Validation Board (RVB) Lite. The IBT is the term used in context of the DDR3 register. Similar functionality or the termination on the DRAM (DDR2 and DDR3) is called on die termination (ODT).

As the memory channel has many stubs (DIMM slots), to reduce the reflections from each stub, a termination is usually used at the end of the stub. This termination is usually very close to the input stage and is integrated on the chip. For the DDR3 register, all command address and control inputs have IBT resistors. The accuracy of this resistor has to be within the specified range, and the system or the memory channel is optimised or designed to work (with good signal Integrity) within the specified range for each specified termination value.

View the PDF document for more information.

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