王剑翰

Is ODT(on-die termination) not necessary for T topology?

Discussion created by 王剑翰 on Jul 28, 2014
Latest reply on Jul 28, 2014 by jamesbone

In IMX6SLHDG.pdf, Page 30:

2.5.2 DDR3 (32 bits) T topology considerations

Be sure to take into account the following when designing a T-topology system.

• Follow the routing rules described in  Table 2-3 .

• Termination resistors not required.

• Short routing lengths and on -chip drive strength control.

• Your design is limited to 4 DDR chips.

• DDR3, 2 GBytes using latest memories (4 GBytes coming).

 

As above claimed,  termination resistors is not necessary for T topology. So ODT is NOT required for T topology? I can not understand it. Please kindly explain it or correct me if my understanding is wrong. Thank you!

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