The problem of SGDMA descriptor

thank you for your suggestion.

but i want to know the Scatter-Gather DMA Controller Core PDF shows the mode of the descriptor data struct is:

typedef struct {

alt_u32 *read_addr;

alt_u32 read_addr_pad;

alt_u32 *write_addr;

alt_u32 write_addr_pad;

alt_u32 *next;

alt_u32 next_pad;

alt_u16 bytes_to_transfer;

alt_u8 read_burst; /* Reserved field. Set to 0. */

alt_u8 write_burst;/* Reserved field. Set to 0. */

alt_u16 actual_bytes_transferred;

alt_u8 status;

alt_u8 control;

} alt_avalon_sgdma_packed alt_sgdma_descriptor;

but in the code i didn't find the structure.

thank you very much.