Altera External Memory PHY Interface Manual de usuario descargar pdf (Pagina 43)

Chapter 3: Functional Description—ALTMEMPHY (nonAFI) 3–27

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.

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Altera External Memory PHY Interface Manual de usuario Pagina 43