Here is an app note with some information to help you understand the differences.
Are you looking for a DDR2 Register or PLL or both? All devices are active status.
Alan
Other Parts Discussed in Thread: CDCU877 , CDCU2A877 Dear expert:
One customer want to use CDCU877 to drive 4 Rank DDR2 memory. But two in Main board, others two on the extend card is this ok? what need to takecare? thanks.
regards
Robin