2 Replies Latest reply on Feb 19, 2017 9:31 PM by jimmjimmshen_1759911

    AN75779 UVC example with GPIF 32bit mode

    jimmjimmshen_1759911

      I had download AN75779.zip(http://www.cypress.com/file/123501/download) 03/24/2016 

         

      use fpga to creat data

         

      the example is 8bit with 30fps works fine then i change to 16bit with 60fps still works fine

         

      but when i change to 32bit (60fps and 120fps) the problem occur the data didn't transfer thought usb

         

      follow the pdf i sure isDQ32bit is true both counters is 4091 and SPI is false

         

      this is the list what i changed:

         

      X,Y dimension ratio to 5:4

         

      height to 1024

         

      fps to 120

         

      frame size to 2621440 (1280*1024*2)

         

      which those in VS format descriptor / VS frame descriptor / UVC Probe control settings

         

      In GPIF setting

         

      change data bus width to 32bit

         

      delete sensor_reset pin

         

      change LD_data_counter/LD_addr_counter to 4091

         

       

         

      So why this problem happen and whats special for 32bit mode?