请教FSMC驱动外部sram

Question

    pa = 6;
            pa=pa<<1;
            (*((volatile unsigned short *) (0x64000000|pa)))=InitValue;

结果发现，实际的效果为pa=1，和pa反向，无论pa送什么值都是这样，觉得和FSMC的设置有关，请大侠帮看看
static void Board_FSMCConfig(void)
{
FSMC_NORSRAMInitTypeDef FSMC_NORSRAMInitStructure;
FSMC_NORSRAMTimingInitTypeDef FSMC_NORSRAMTimingInitStructure;
/* FSMC读速度设置 /
FSMC_NORSRAMTimingInitStructure.FSMC_AddressSetupTime = 0x0f; / 地址建立时间 /
FSMC_NORSRAMTimingInitStructure.FSMC_AddressHoldTime = 0x0f;

FSMC_NORSRAMTimingInitStructure.FSMC_DataSetupTime = 0x0f; / 数据建立时间 /
FSMC_NORSRAMTimingInitStructure.FSMC_BusTurnAroundDuration = 0x00;
FSMC_NORSRAMTimingInitStructure.FSMC_CLKDivision = 0x00;
FSMC_NORSRAMTimingInitStructure.FSMC_DataLatency = 0x00;
FSMC_NORSRAMTimingInitStructure.FSMC_AccessMode = FSMC_AccessMode_B; / FSMC 访问模式 */

FSMC_NORSRAMInitStructure.FSMC_Bank = FSMC_Bank1_NORSRAM2;
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_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_AsynchronousWait = FSMC_AsynchronousWait_Disable;
FSMC_NORSRAMInitStructure.FSMC_ExtendedMode = FSMC_ExtendedMode_Disable;
FSMC_NORSRAMInitStructure.FSMC_WriteBurst = FSMC_WriteBurst_Disable;
FSMC_NORSRAMInitStructure.FSMC_ReadWriteTimingStruct = &FSMC_NORSRAMTimingInitStructure;
FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure); 
/* FSMC写速度设置 */

FSMC_NORSRAMInit(&FSMC_NORSRAMInitStructure); 

/* Enable FSMC Bank4_SRAM Bank */
FSMC_NORSRAMCmd(FSMC_Bank1_NORSRAM2, ENABLE);  

}