NEC switch - Manual (Page 145)

CHAPTER 8 USB FUNCTION
User’s Manual U12978EJ3V0UD
145
Figure 8-25. Flowchart of Transmit/Receive Pointer Operation (6/7)
(3) Data packet transmit (2/2)
Y
Y
N
N
N
2
3
3
USBPOB
overflow?
Y
N
USBPOB
overflow?
Y USBPOW
= 71H?
USBPOB increment
USBPOB increment
USBPOW increment
Bit Read
Set USBPOW to 70H
Read CRC
redundant bit
Does bit stuff
signal = 1?
Y
N
Does bit stuffing
signal = 1?
Set EOP
transmit signal
Idle state