+# After a PREamble PID, the bus segment between Host and Hub uses LS signalling
+# rate and FS signalling polarity (USB 2.0 spec, 11.8.4: "For both upstream and
+# downstream low-speed data, the hub is responsible for inverting the polarity of
+# the data before transmitting to/from a low-speed port."
+ 'low-speed-rp': {
+ # (<dp>, <dm>): <symbol/state>
+ (0, 0): 'SE0',
+ (1, 0): 'J',
+ (0, 1): 'K',
+ (1, 1): 'SE1',
+ },