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SS5's avatar
SS5
Icon for Occasional Contributor rankOccasional Contributor
8 years ago

FIFO:How to slow down the clock Frequency from 50 Mhz

once I enable your counter, it is writing at full clock speed to the fifo once the fifo is full, the counter just continues counting by the time it start reading and printing the first value to the...
SS5's avatar
SS5
Icon for Occasional Contributor rankOccasional Contributor
8 years ago

Hi

On-Chip Memory Size is 4096

FIFO Depth : 1024

So, have i have set the 

 # define ALMOST_EMPTY 1
 # define ALMOST_FULL 1000               //FIFO Depth 1024

The ALMOSTEMPTY and ALMOSTFULL printed in the console are correct.

# define ALMOST_EMPTY 1
 # define ALMOST_FULL 1000               //FIFO Depth 1024
 
int main()
{
 
       	 int result,i=0;
      // 	Reset the FIFO's IRQ History register. *
       	altera_avalon_fifo_clear_event(FIFO_0_IN_CSR_BASE, ALTERA_AVALON_FIFO_EVENT_ALL);
 
    	  int code = ALTERA_AVALON_FIFO_OK;
    	  code= altera_avalon_fifo_init(FIFO_0_IN_CSR_BASE, 0x3F,ALMOST_EMPTY,ALMOST_FULL);
 
    	 IOWR(ENABLE_PIO_BASE, 0, 0x1);
    	 printf("STATUS = %u\n", altera_avalon_fifo_read_status(FIFO_0_IN_CSR_BASE,altera_avalon_fifo_read_status));
    	 while(1)
    	 {
    	 result=altera_avalon_fifo_read_fifo(FIFO_0_OUT_BASE,FIFO_0_IN_CSR_BASE);
     printf("%d\n",result);
    
    	 }
	return 0;
}

In NIOS console,

STATUS =16

result: 0

Suggestion Please