3 - connect zprobe (note: it currently inverts because it didn't have any
4 other chips around. this may change later.)
6 - capture the USB signals at an interesting moment with a sample rate of
9 - zoom into the frame(s) of interest
11 - download the data with
17 For manual decoding, set the coders to D+ and D- (we need D- for SE0
18 and SE1 detection), then click on a rising clock edge left of the
19 packet and move the cursor to the right.
21 - if there are problems with the clock, the analog signal and digital
22 signals derived from it can be examined after running dec.py with
25 (Note that the digital zprobe hides any analog anomalies.)