Altera DDR Timing Wizard - Manual (Page 77)

Altera Corporation 3–17
November 2007 DDR Timing Wizard User Guide
Using the dtw_timing_analysis.tcl Script
Figure 3–8. Initial Resynchronization, Postamble Clock Cycle, and Phase Shift Selections
The legacy controller MegaWizard has the intermediate registers for
resynchronization turned on and the intermediate registers for postamble
turned off by default.
The intermediate resynchronization registers do not affect the
resynchronization clock cycle and phase shift selections in the legacy
controller MegaWizard as they are inserted between the second
resynchronization registers and user logic. These registers are needed if
the outputs of the second resynchronization registers cannot meet setup