NEC switch - Manual (Page 147)

CHAPTER 8 USB FUNCTION
User’s Manual U12978EJ3V0UD
147
8.8.2 Receive bank switching ID detection buffer operation
Figure 8-26. Flowchart of Receive Bank Switching ID Detection Buffer Operation
Y
Y
Y
01B
00B
N
Idle state
Idle state
2-bit store & shift
1-bit store & shift
Set buffer to 00H
Bit judgment enable
Set TOSTAT
Bit judgment mask
Sync1 detection
signal = 1?
EOP received?
Store bit ?
Set DASTAT Set HSSTAT
11B 10B
TOSTAT: Bit 0 of packet receive status register (RXSTAT)
DASTAT: Bit 1 of packet receive status register (RXSTAT)
HSSTAT: Bit 2 of packet receive status register (RXSTAT)