这是xilinx应用指南xapp851的中文版本。本应用指南描述了在 Virtex™ -5 器件中实现的 200 MHz DDR SDRAM （JEDEC DDR400

(PC3200) 标准）控制器。本设计实现使用 IDELAY 单元调整读数据时序。读数据时序校准和调整在此控制器中完成。-This is the xilinx application note xapp851 the Chinese version. This application note describes the Virtex ™ -5 devices to achieve 200 MHz DDR SDRAM (JEDEC DDR400

(PC3200) standard) controller. The Design and Implementation of the use of IDELAY unit to adjust read data timing. Reading the data calibration and adjust the timing for completion of this controller.