On Die Termination in DDR3

[tramu]

Dear sir,

I would like to know what is the purpose/use of On Die Termination control pin in DDR3 memory chip.

When will it get asserted by controller (during read/write)?

Can this pin be permanently pulled HIGH at DDR3 chip to enable On Die Termination ?

Please answer my query.....

Regards,
Thulasi

 

[shaiko]

From what I know ODT is parallel and switched off during the write - hence, when the DDR is receiving data - the ODT is switched off all other times.