利用直接时钟控制技术实现 DDR2 SDRAM 物理层 Application Note: Virtex-4 Family R DDR2 SDRAM Physical Layer Using Direct-Clocking Technique XAPP701 (v2.0) March 12, 2007 Author: Tze Yi Yeoh Summary This application note describes the DDR2 SDRAM physical layer design using the direct-clocking technique in a VirtexTM-4 device. The direct-clocking technique utilizes some of the architectural features unique to the Virtex-4 family, for ……