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Virtium Technology, Inc.


what is ODT - On-Die Termination (ODT) is a semiconductor based termination scheme to reduce electrical 'noise' in the signal of the memory bus, specifically reflections on the data bus of a memory subsystem and eliminate bounce back of electrical signals on the high speed transmission lines for these electrical traces/connections.  Electrical signals can be reflected at points where impedance differs, such as at the bus and at DRAM connection points. ODT resistors are built into each DDR2 memory chip and eliminates the need for having terminating resistors built into the motherboard. The ODT resistors in the chip, are deactivated when the chip is in use and reactivatedwhen the chip is in standby mode.  (Refer to a technical paper on this subject)

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