Altera External Memory PHY Interface - Manual (Page 49)

Chapter 3: Functional Description—ALTMEMPHY (nonAFI) 3–33
Functional Simulation—the ModelSim Wave and Transcript Window
© January 2010 Altera Corporation External Memory PHY Interface (ALTMEMPHY) (nonAFI) Megafunction User Guide
Read Calibration Phase
Figure 3–9 on page 3–34 shows that the read data calibration stage closely follows the
write data stage. The calibration repeatedly performs the following steps:
1. Reads back the data pattern.
2. Records pass/fail.
3. Increments the PLL phase step. (360°/number of phase steps).
4. Repeats.