看原子的资料，驱动了DM9000，地址线就用了一根，其他的引脚想做普通的IO接口，但是实验了一下好像不行，FSMC配置如下        FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM2;        //NE2
        FSMC_NORSRAMInitStructure.FSMC_DataAddressMux = FSMC_DataAddressMux_Disable;
        FSMC_NORSRAMInitStructure.FSMC_MemoryType = FSMC_MemoryType_SRAM;
        FSMC_NORSRAMInitStructure.FSMC_MemoryDataWidth = FSMC_MemoryDataWidth_16b;
        FSMC_NORSRAMInitStructure.FSMC_BurstAccessMode = FSMC_BurstAccessMode_Disable;
        FSMC_NORSRAMInitStructure.FSMC_AsynchronousWait = FSMC_AsynchronousWait_Disable;
        FSMC_NORSRAMInitStructure.FSMC_WaitSignalPolarity = FSMC_WaitSignalPolarity_Low;
        FSMC_NORSRAMInitStructure.FSMC_WrapMode = FSMC_WrapMode_Disable;
        FSMC_NORSRAMInitStructure.FSMC_WaitSignalActive = FSMC_WaitSignalActive_BeforeWaitState;
        FSMC_NORSRAMInitStructure.FSMC_WriteOperation = FSMC_WriteOperation_Enable;
        FSMC_NORSRAMInitStructure.FSMC_WaitSignal = FSMC_WaitSignal_Disable;
        FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Disable;
        FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;
        FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &ReadWriteTiming;
        FSMC_NORSRAMInitStructure.FSMC_WriteTimingStruct = &ReadWriteTiming;
        FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure);
        FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM2,ENABLE); //使能FSMC的Bank1_Bank1_NORSRAM2