摘要： 随着近年来高速计算机的快速发展，人们对存储器频宽及性能的要求越来越高。作为第2代DDR存储器的DDR2 SDRAM具有高速、低功耗、高密度、高稳定性等特点，在未来的一二年里，它将逐步取代DDR SDRAM而成为内存的主流。尽管DDR2的地位正在不断上升，但DDR仍是当前流行的高速存储器。该文通过对这两种存储器的分析比较，基于WISHBONE总线，提出并实现了一种可兼容DDR与 DDR2存储器的控制器。

关键词: DDR SDRAM, DDR2 SDRAM, WISHBONE, 控制器

Abstract: With the rapid increases of computer performance in recent years, designers face great challenges such as increasing the frequency and increasing the performance of memory. Compared with the DDR SDRAM, DDR2 SDRAM has higher speed, lower power, higher efficiency and higher stability. A recent statistics shows that DDR2 will become popular in one or two years, but DDR still prevails today. For this reason, this article deals with the design and implementation of the DDR/DDR2 SDRAM compatible controller based on a common standard bus interface.

Key words: DDR SDRAM, DDR2 SDRAM, WISHBONE, Controller