参考系统：决定 DDR 反馈时钟的最佳 DCM 相移 Application Note: Embedded Processing R Reference System: Determining the Optimal DCM Phase Shift for the DDR XAPP977 (v1.1) June 1, 2007 Feedback Clock for Spartan-3E Author: Ed Hallett Abstract This application note describes how to build a Spartan-3E embedded system that is used to determine the optimal phase shif……