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<body><div>Hi Scott.</div><div><br></div><div>There is nothing wrong with the link you sent me. I answered Dave before I received your mail. And I have always imagined that I get ALL mails on the Apache labs forum but when I read through the list I see when I followed your link, I have not got any of the mails concerning the Hermes Protocol 2. And if I try to answer or send a mail, all bounce back to me.</div><div><br></div><div>So I was not aware that there was a separate firmware developing team that was working with this. Anyway, all of the updates should be sent to the same place and not spread all over the net.</div><div><br></div><div>I have tested all versions of Hermes 16 bit firmware for protocol 2 and all works in RX mode. I can run 1,5 Mhz sampling with good results but in TX there are no sign of signals from the FPGA to the DAC. When I mentioned this for Phil, he was sure it is due to the FPGA speed in my Hermes boards.</div><div>I do not think I am the only one that has this problem but I have not seen anyone mention this.</div><div><br></div><div>Can you help me to be able to get the mails from Apache labs forum? I can not log into it using what I believe is my user name and password.</div><div><br></div><div>73, Kjell</div><div><br></div><div><br></div><div><br></div><div>På Tue, 18 Feb 2020 17:09:41 +0100, skrev Scott Traurig <scott.traurig@gmail.com>:<br></div><br><blockquote style="margin: 0 0 0.80ex; border-left: #0000FF 2px solid; padding-left: 1ex"><div dir="ltr"><div>Kjell,</div><div><br></div><div>What was wrong with the link I sent you?</div><div><br></div><div><a href="https://apache-labs.com/community/viewforum.php?f=32" target="_blank">https://apache-labs.com/community/viewforum.php?f=32</a> </div><div><br></div><div>In this case no one can spoon feed you the "one true link". There are many variants of the firmware that have been produced for each hardware platform. In your case you need to read the Hermes related thread at that link, understand which versions have been successful and for whom, and then start experimenting with various versions (all posted in the platform specific discussions) yourself.</div><div><br></div><div>The problem is not that the FPGA is not fast enough, or big enough (size is a problem on the 14-bit Hermes, though). The problem is that a universal timing closure that works for all serial numbers has not been discovered. This problem is essentially limited to the MAC logic in the FPGA, which is the only part of the build that runs at speeds higher than 125MHz. There is sufficient variability in the silicon, power supplies, and perhaps even board trace lengths, such that a build that works for Person A with serial number X may not work for Person B with serial number Y. Many people can even observe temperature related effects whereby the build will not be stable until the hardware warms up, or vice versa.<br></div><div><br></div><div>There just hasn't been sufficient hardware engineering on the design at GigE speeds, and using the free version of Quartus is also a significant handicap. All honor to Rick, N1GP, who took us out of a nasty Alpha test stage and has gotten us into a pretty good Beta state, But it's still not easy for everyone to run Protocol 2.</div><div><br></div><div>73,</div><div><br></div><div>Scott/w-u-2-o</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 18, 2020 at 4:43 AM Kjell Karlsen <<a href="mailto:la2ni@online.no">la2ni@online.no</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
<div><div>Hi Dave.</div><div><br></div><div>That is were I have been looking but the version 10.8 is not there. It was mentioned on the Apache labs forum but I am not able to find it.</div><div><br></div><div>I have problems with at least two of the Hermes boards that we bought from TAPR (or built ourself from the PCB´s we got). They works OK in RX but nothing out in TX. I asked Phil about this and he say that it is the FPGA that is not fast enough. </div><div><br></div><div>I had hoped that someone comes up with firmware for Hermes that solves this problem (if it is possible at all).</div><div><br></div><div>Thanks, </div><div>73, Kjell<br></div></div></blockquote></div></div>
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