cyclone III EP3C25 开发板原理图,包括flash, sdram, usb, ethernet 等接口电路，可作设计参考。,cyclone III EP3C25 development board schematic diagram, including flash, sdram, usb, ethernet interface circuit, etc., can be used for design.

ALTERA的SDRAM的控制器和时序文档说明，很详细也很简洁，是一份不可多得的SDRAM开发的参考文档-ALTERA and timing of the SDRAM controller documentation, very detailed but also very simple, is a rare development of reference documentation SDRAM

ALTERA SDR SDRAM controller 说明文档(Altera SDR SDRAM Controller pdf)