NEC switch - Manual (Page 114)

CHAPTER 8 USB FUNCTION
User’s Manual U12978EJ3V0UD
114
Figure 8-14. Format of Token Packet Receive Result Store Register
Symbol <6> <7> <5> <4> <3> <2> <1> <0>
CRC5ER TBITER TBYER END1RX END0RX ADRRST TIDRST SETRX
CRC5ER CRC error detection (5-bit mode)
0
1
FF62H
Address
TRXRSL
After reset
00H
R/W
R/W
CRC error did not occur in received token packet.
CRC error occurred in received token packet.
TBITER Bit stuffing error detection
0
1
Bit stuffing error did not occur in received token packet.
Bit stuffing error occurred in received token packet.
TBYER Received token packet length error detection
0
1
Packet length of received token packet is normal.
Packet length of received token packet is abnormal.
END1RX Endpoint 1 reception detection
0
1
No token packet corresponding to Endpoint 1 is received.
Token packet corresponding to Endpoint 1 was received.
END0RX Endpoint 0 reception detection
0
1
No token packet corresponding to Endpoint 0 is received.
Token packet corresponding to Endpoint 0 was received.
ADRRST Token packet address compare result
0
1
Received token packet address and value of token address compare register (ADRCMP) do not match.
Received token packet address and value of ADRCMP match.
TIDRST Token packet ID compare result detection
0
1
Received token packet ID and value of token PID compare register (TIDCMP) do not match.
Received token packet ID and value of TIDCMP match.
SETRX Setup token packet reception detection
0
1
Received token packet ID is other than Setup packet.
Received token packet ID is Setup packet Note .
Note If SETRX is set to 1, the following occurs.
• All reservations are cleared
• DNAEN (bit 1 of the handshake packet transmit reservation register (HTXRSV)) is cleared
• DWRMSK (bit 0 of the data/handshake packet receive mode register (URXMOD)) is cleared