NEC switch - Manual (Page 152)

CHAPTER 8 USB FUNCTION
User’s Manual U12978EJ3V0UD
152
Figure 8-33. Flow Chart of Bit Stuffing Control Operation
Y
Y
Y
N
N
Idle state
Idle state
Transmit bit input
Shift bit
stuffing register
Disable save
of next transmit bit
Reset bit
stuffing register
Disable
USBPOB increment
Transmission start?
Transmit bit = 1?
Y
N
Bit stuffing register
= 3FH?
Was
EOP receive signal
set?
Reset bit
stuffing register
N