NEC switch User Manual
Page 118
CHAPTER 8 USB FUNCTION
User’s Manual U12978EJ3V0UD
118
Table 8-3. Conditions in Transmit Reservation (2/2)
(b) Transmit reservation for Endpoint1 and IN token packet
Type of Reservation
DT01EN
DT11EN
E1STEN
E1NAEN
Transmit reservation of data in transmit buffer 0
1
0
0
0
Transmit reservation of data in transmit buffer 1
0
1
0
0
Endpoint 1 STALL transmit reservation
(halt status)
0
0
1
0
Endpoint 1 NAK transmit reservation
(no transmit data)
0
0
0
1
Two or more reservations above
Setting prohibited
(c) Handshake transmit reservation for data packet
Type of Reservation
STALEN
DNAEN
STALL transmit reservation during occurrence
of length error
1
0
NAK transmit reservation during previous
receive data save
Note
0
1
Two or more reservations above
Setting prohibited
Type of Reservation
ACKEN
DNAEN
ACK transmit reservation during normal data
packet reception
1
0
NAK transmit reservation during previous
receive data save
Note
0
1
Two or more reservations above
Setting prohibited
Note When saving the receive data packet, set DWRMSK to 1 (bit 0 of the data/handshake packet
receive mode register (URXMOD)) at the same time.