Altera QDRII SRAM Controller MegaCore Function Manuel d'utilisateur télécharger pdf (Page 37)

Altera Corporation MegaCore Version 9.1 3–5

November 2009 QDRII SRAM Controller MegaCore Function User Guide

Functional Description

When this initialization time has elapsed, the training group module

monitors the data coming back and checks for its validity.

When the training group module detects a pattern, it checks to see if it is

too early, too late, or on time. If the pattern is too early, the pointer moves

by one; too late, the pointer moves by one in the other direction. The

training group module retrains until the pointer is correct.

The RAM size ensures there is minimal latency, but there is enough slack

to compensate for the training pattern realignment.

Datapath

Figure 3–4 on page 3–6 shows the datapath block diagram.

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Altera QDRII SRAM Controller MegaCore Function Manuel d'utilisateur Page 37