Hi, > Only about 2m. So let's test it again with the long cable. I will include a > 6N138 with the board I'm shipping you.
Great! Tks. > For the waveform test, I used a 24.4kHz squarewave generator inside the FPGA > (design files attached, just create a Spartan6 ISE project with those) and > looped back MIDI OUT to MIDI IN with the 2m cable, then measured the signal at > the output of the optoisolator (btw: it might be a good idea to include a test > point there on the next PCB run, even though this signal is already easy to > access due to the big size of the components). I got a square signal > oscillating between 0.3V and 3.0V approximately. The rise time was pretty > slow, but most of the "slowness" occurs above 2V which is the threshold of the > FPGA input, so it should be fine. Falling edges are OK. > > I also performed communication tests using real MIDI data between the board > and a computer using a USB/MIDI adapter. I'll try to learn and do the same as you did once I receive. Adam _______________________________________________ http://lists.milkymist.org/listinfo.cgi/devel-milkymist.org IRC: #milkym...@freenode Webchat: www.milkymist.org/irc.html Wiki: www.milkymist.org/wiki
