Flowchart Of Sync Detection/Usbclk Detector Operation - NEC switch User Manual

CHAPTER 8
Figure 8-29. Flowchart of Sync Detection/USBCLK Detector Operation
Idle state
N
Did state change
to K state?
Y
USB clock
oscillation start
Output 0
from NRZI decoder
Receive next bit
Y
Did bus state
change?
N
Output 1
from NRZI decoder
Detect last Sync bit
Y
Was EOP receive
signal set?
N
Receive next bit
N
Did bus state
change?
Y
Output 0
from NRZI decoder
User's Manual U12978EJ3V0UD
USB FUNCTION
USB clock stop
Output 1
from NRZI decoder
Idle state
149