hinglecringle

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  • April 27, 2018 at 7:01 AM in reply to: Finished Building OSSC, Both leds solid color, screen turns on shows nothing #21187
    hinglecringle
    Participant

      Oh man, to my surprise I think the FPGA might be functional! When I hit autodetect in the Quartus software it gives me options EP3C16 and EP4CE15. Why the option for EP3C16? I’m going to follow through with the rest of the instructions on that link to see if I can flash the firmware.

      edit: Nevermind I don’t want to press anything yet, I can only tick one set of boxes, doesn’t look the same as the tutorial. But at least it seems that something is detected. https://imgur.com/a/SXGxHA7

      edit2: If I hit the bottom set of check boxes, it checks the top one too and looks like the tutorial. I guess I successfully programmed it because it said it was completed successfully. But the unit still does the same thing, lights up and nothing else. So I guess there is a short somewhere?

      April 25, 2018 at 10:36 PM in reply to: About the tolerance of capacitors and resistors #21125
      hinglecringle
      Participant

        I believe the tolerance must be equal to or lower than what is on the BOM

        April 25, 2018 at 10:34 PM in reply to: Finished Building OSSC, Both leds solid color, screen turns on shows nothing #21124
        hinglecringle
        Participant

          Okay, so I’ve finally got the USB Blaster, and please forgive me for this noob question but, does the OSSC need to be powered on from the PSU while the USB Blaster is connected? Any suggestions on what older version of Quartus Prime I should use? I know there’s a forum post that mentions this old Quartus Prime version somewhere I’ll try and dig for it later.

          April 13, 2018 at 10:57 PM in reply to: Finished Building OSSC, Both leds solid color, screen turns on shows nothing #20773
          hinglecringle
          Participant

            A little update on this, I haven’t put it up for sale yet as I’ve been slowly trying to reflow the pins on the chips while I wait for the Chinese USB Blaster clone, which will be a while. I just want to know that I did everything within my reach before sending this OSSC off haha. So far I’ve tried reflowing the TVP7002 and the FPGA and still the same results. I’m using the solder wick method since it’s all I got. I have a couple more chips to go, and I guess I’ll update this when the USB Blaster clone comes in to see if I can access the FPGA.

            March 30, 2018 at 9:25 AM in reply to: Finished Building OSSC, Both leds solid color, screen turns on shows nothing #20499
            hinglecringle
            Participant

              Dang, I don’t have a microscope but I’ll check again for Bridges through the best magnifying glass that I have next week, and also I’ll look into interacting with the fpga via JTAG.

              March 23, 2018 at 8:21 PM in reply to: Finding parts substitutes, will these work? (caps, resistors, transistors) #20344
              hinglecringle
              Participant

                Awesome thanks! I think I’m good to go. Thanks for the help and the knowledge I appreciate it, can’t wait to give this a shot

                March 22, 2018 at 12:08 AM in reply to: Finding parts substitutes, will these work? (caps, resistors, transistors) #20300
                hinglecringle
                Participant

                  Ah okay, the temperature coefficient should be okay with the MCT0603MC1000FP500 because it is lower. The rest of the caps and resistors all meet the criteria so that should be good too!

                  As far as the diode goes the one that I chose as a substitute (SD05T1G) has a 0.55 higher breakdown voltage compared to the one listed on the BOM (SD05-7). Does this voltage value need to be the same? Is it okay if it is that much higher?

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