Can Nios Read 128-bit-wide data?

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No. NIOS has a 32-bit wide data bus. If you perform a 128-bit read, the NIOS will actually perform 4 reads to get the data.

Jake

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So , what if I use a DMA component to read 128-bit-wide data?

For example :

//////// Code start////////////# define TRANSFER_SIZE 2

int return_code ;

alt_dma_rxchan tx, rx ;

if( (tx= alt_dma_txchan_open("/dev/dma")) == 0 )

{

printf( "create dma failed" ) ;

return -1 ;

} if( (rx= alt_dma_rxchan_open("/dev/dma")) == 0 )

{

printf(" create dma failed" ) ;

return -1 ;

}

//// configure the DMA

alt_dma_txchan_ioctl( tx , ALT_DMA_SET_MODE_128 , (void*) (RAM_BASE) ) ;

alt_dma_rxchan_ioctl( rx , ALT_DMA_SET_MODE_128 , (void*)(DEST_BASE) ) ;

///// start transfer

return_code = alt_dma_txchan_send( tx , RAM_BASE , TRANSFER_SIZE , 0 , 0 ) ;

return_code = alt_dma_rxchan_prepare( rx , DEST_BASE , TRANSFER_SIZE , 0 , 0 ) ;

//////// Code end

Could I make it work?