ALTDQ_DQS2 IP Core User Guide

ID 683742
Date 5/08/2017
Public
Document Table of Contents
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DQS Enable Control

The goal of DQS enable calibration is to find settings that satisfy the following conditions:

  • The DQS enable signal rises before the first rising edge of DQS.
  • The DQS enable signal sets to 1 after the second-last falling edge of DQS.
  • The DQS enable signal falls before the last falling edge of DQS.

The ideal position for the falling edge of the DQS enable signal is centered between the second-last and last falling edges of DQS.