【应用笔记】Stratix II器件和DDR SDRAM的接口(Interfacing DDR SDRAM with Stratix II Devices)
DDR SDRAM器件如今广泛使用在各个应用领域，如嵌入式处理器系统、图像处理、存储、通信和网络。
DDR SDRAM devices are widely used today for a broad range of
applications, such as embedded processor systems, image processing,
storage, communications and networking. In addition, the universal
adoption of DDR SDRAM in PCs made DDR SDRAM memory a
compelling, cost effective DRAM solution for high-bandwidth
applications.
Stratix® II devices support two modes of DDR SDRAM interfacing: with
and without dedicated DQS circuitry. In addition, Stratix II and Stratix II
GX device families offer two different data paths or physical interfaces
(PHYs) with the dedicated DQS phase-shift circuitry: the legacy
integrated static data path and controller (referred to as the legacy
controller in this document) and ALTMEMPHY. With dedicated circuitry
and ALTMEMPHY, Stratix II devices can interface with 233-MHz DDR
SDRAM. Without dedicated circuitry, Stratix II devices can interface with
150-MHz DDR SDRAM.an327.pdf