Rev. 3.0, 03/01, page 308 of 390
When a transaction completes, the completion status is reported to the List Processor. The SIE
can compile all error information to create the CompletionCode field for the TD writeback,
but may be overridden by the List Processor. Table 18-17 shows the transaction status (nearly
identical to the CompletionCode) definitions generated by the SIE to the List Processor. Table
18-18 and Table 18-19 show the prioritization of transaction status used by the SIE to create the
encoding.
Table 18.17 SIE Completion Status
Completion Code
Definition
Description
0000
N
O
E
RROR
ACK handshake for general TD, Successful data
packet transfer for isochronous TD.
0001
CRC
CRC Error detected in the received data packet.
0010
B
IT
S
TUFFING
Bit Stuff violation occurred in received packet.
0011
D
ATA
T
OGGLE
M
ISMATC
H
Data toggle state of the PID did not match in received
data packet.
0100
STALL
STALL handshake received. Additionally, a NAK
handshake following an isochronous IN token.
0101
D
EVICE
N
OT
R
ESPONDIN
G
Endpoint did not respond the token request and
timed-out.
0110
PIDC
HECK
F
AILURE
The PID check bits did not match in received packet.
0111
U
NEXPECTED
PID
Received a PID which did not match the packet size
or protocol or is not defined.
1000
D
ATA
O
VERRUN
Number of data bytes received exceeded the
expected.
1001
D
ATA
U
NDERRUN
Number of data bytes received is less than expected
1010
Reserved
1011
Reserved
1100
B
UFFER
O
VERRUN
Internal data buffer is full resulting in lost IN data.
1101
B
UFFER
U
NDERRUN
Internal data buffer is empty resulting in bad OUT
data.
1110
N
OT
A
CCESSED
Transaction aborted due to EOF.
1111
N
OT
A
CCESSED
NAK handshake received.
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