Altera External Memory PHY Interface - Manual (Page 43)

Chapter 3: Functional Description—ALTMEMPHY (nonAFI) 3–27
Functional Simulation—the ModelSim Wave and Transcript Window
© January 2010 Altera Corporation External Memory PHY Interface (ALTMEMPHY) (nonAFI) Megafunction User Guide
Functional Simulation—the ModelSim Wave and Transcript Window
To better understand the operation of the ALTMEMPHY megafunction and the
memory controllers, identify the various stages of operation, the expected results, and
the behavior of the IP. The following sections describe each of these stages in greater
detail.
■ “Full Window Stage Identification” on page 3–27
■ “Initialization Stage” on page 3–29
■ “Write Training Data Stage” on page 3–31
■ “Read Calibration Phase” on page 3–33
■ “Functional Memory Use Stage” on page 3–37
Full Window Stage Identification
Figure 3–6 on page 3–28 shows a standard appearance of an example testbench in the
ModelSim ® -Altera software.
1
The total simulation time around 270 µs to 203 µs is used for the memory initialization
requirements, and in this example 61 µs is used by the calibration routine to calibrate
using just a single DQ pin. In general, the PLL initialization phase has negligible
impact on the overall simulation time.
f
For further information on simulating the PLL, refer to Phase-Locked Loop (ALTPLL)
Megafunction User Guide .