NEC switch User Manual page 118

(b) Transmit reservation for Endpoint1 and IN token packet
Type of Reservation
Transmit reservation of data in transmit buffer 0
Transmit reservation of data in transmit buffer 1
Endpoint 1 STALL transmit reservation
(halt status)
Endpoint 1 NAK transmit reservation
(no transmit data)
Two or more reservations above
(c) Handshake transmit reservation for data packet
Type of Reservation
STALL transmit reservation during occurrence
of length error
NAK transmit reservation during previous
receive data save
Two or more reservations above
Type of Reservation
ACK transmit reservation during normal data
packet reception
NAK transmit reservation during previous
receive data save
Two or more reservations above
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.
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CHAPTER 8
Table 8-3. Conditions in Transmit Reservation (2/2)
Note
Note
User's Manual U12978EJ3V0UD
USB FUNCTION
DT01EN DT11EN
1 0
0 1
0 0
0 0
Setting prohibited
STALEN DNAEN
1 0
0 1
Setting prohibited
ACKEN DNAEN
1 0
0 1
Setting prohibited
E1STEN E1NAEN
0 0
0 0
1 0
0 1