  
		demoʹDMAУݰCRCни
		CRC㣬ȷڴͨ
		ȷҲڴͨѶϢ		
	
  ע
		Ҫ޸Уݰĳȣעͬ޸DMA
		ݳȣDMATestPattern.DMATransferNUM
			
