Fft In Sopc

Hi

I want to speak about connect SGDMA and start transmit data.

SGDMA has 4 Signal

1 - read/write Descriptor Signal: this Signal Should be connected to the memory where you write your Descriptor, for example:

- in Sopc builder i will connect read/write Descriptor Signal to The (On_Chip_Memory) it name : "INPUT_RAM".

-so in Nios II Program I should add Descriptor as following:

alt_sgdma_descriptor *desc = (alt_sgdma_descriptor*)input_ram_base ;

****************

2 - read or In Signal: connected to the memory where I write my input Data

in Nios II Program:

alt_u32 *tx_ptr = (alt_u32 *) (INPUT_RAM_BASE+ ALTERA_AVALON_SGDMA_DESCRIPTOR_SIZE);

where tx_ptr is a pointer of memory where data will be read from.

*****************

3 - CSR Signal: should connected to the CPU, it is needed to asked SGDMA about its status.

*****************

4 - write or out Signal: connected to the memory where i want to write output data:

alt_u32 * rx_ptr = (alt_u32 *) (OUTPUT_RAM_BASE+ ALTERA_AVALON_SGDMA_DESCRIPTOR_SIZE);

where tx_ptr is a pointer of memory where data is written