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The new 'usb_signalling' and the 'usb_protocol' PD which stacks on top
of it, replace the old 'usb' decoder.
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Also, add missing ones which are mentioned in the USB spec. However, not
all may be relevant for LS/FS signalling. But they're still useful to
have in the table, so we can output warnings like
"Warning: HS PID encountered, but device is FS???"
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Some of the differences of USB low-speed (compared to full-speed) are:
- 1.5Mb/s datarate, not 12MBit/s.
- The J and K states are swapped/inverted.
Note: This is work in progress, further changes may still be needed.
Add a 'signalling' option, which allows the user to select whether the
PD should decode using the low-speed or full-speed signalling protocol.
If unspecified, the default is full-speed.
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