PCIE DMA寄存器出错

想用FPGA跟PC通过DMA通信: 

Qsys 配置如图:  

 

驱动写 DMA 代码: 

     

KdPrint(("  中断已经注册       \n"));

 

// 1. 设置DMA参数

WRITE_REGISTER_ULONG((PULONG)(g_MemRegister + 0x4000 + 0x04), (ULONG)0xffffffff); // DMA 读地址

WRITE_REGISTER_ULONG((PULONG)(g_MemRegister + 0x4000 + 0x08), (ULONG)0xffffffff); // DMA 写地址

//WRITE_REGISTER_ULONG((PULONG)(g_MemRegister + 0x4000 + 0x08), (ULONG)m_pycialAddressForImage.LowPart);

WRITE_REGISTER_ULONG((PULONG)(g_MemRegister + 0x4000 + 0x0C), (ULONG)0x0);  // DMA 长度

DumpBuffer(g_MemRegister + 0x4000 , 0x40);   // 打印日志

 

 

 

DumpBuffer 打印出来的,内容:

 

 

跟我想要的完全不一样,    这是什么原因啊?