i.mx27开发板的整套详细原理图，包括：DDR SDRAM, NAND FLASH, NOR FLASH, USB OTG, USB HOST,FEC PHY, UART,JTAG等等接口-i.MX27 development board schematic details of the package, including: DDR SDRAM, NAND FLASH, NOR FLASH, USB OTG, USB HOST, FEC PHY, UART, JTAG interface,