[SI-LIST] DDR Eye diagrams

For measuring DDR eye diagrams, the best location to measure reads is at =
the memory controller and the best place to measure writes is at the =
DDR. For example, measuring reads at the DDR will show more reflections =
than actually seen by the memory controller (I should mention that I =
have only series termination).

This sounds simple, but I cannot think of a way to make the scope =
differentiate between reads and writes. You might suggest that I create =
a memory test which only does reads or only does writes. However, my =
worst case signals are when the entire system is running.

Can anyone tell me how to make the scope trigger only on reads or only =
on writes?

Thanks,
David
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