On Wednesday 18 September 2019 16:09:48 Joe wrote: > On Wed, 18 Sep 2019 10:20:22 -0500 > > John Hasler <jhas...@newsguy.com> wrote: > > Your scope could show you eye patterns but that's probably of little > > use. You need to look at all three data channels and the clock > > (these are differential so you need eight inputs) and trigger on > > patterns. otherwise all you will learn is that the interface is > > clocking. > > I suspect that if all eight lines are waggling, that's good enough. > > By the way, I have a 40MHz scope whose response extends far enough to > show a thickening of the trace on 1.5Gb/s signals, which is good > enough for presence/absence. > > What would be a real pain is actually accessing HDMI signals while the > thing is running. It's no good just looking into a connector, it needs > to see something hanging on the end before it will power up and > activate.
IOW, disconnecting and looking into the connector with a scope probe is a waste of time. HDMI is post my time in the broadcast business by 15 years, so I know little about it from my former $dayjob. I had the obligatory turkey dinner and collected the Rolex in the middle of 2002, haveing sat in that chair, when I had time to sit, since Oct 1984 and monitors were just gettiing smart enough to tell the drivers what they needed, so I had suspected as much. Thank you Joe. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene>
