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Error Register
The Error register contains bits for each of the error sources in the USB. Each of these bits is
qualified with its respective error enable bits. The result is OR’ed together and sent to the
ERROR bit of the Interrupt Status register. Once an interrupt bit has been set it may only be
cleared by writing a one to the respective interrupt bit. Each bit is set as soon as the error
condition is detected. Therefore, the interrupt typically will not correspond with the end of a
token being processed. The Error register contains enable bits for each of the error interrupt
sources within the USB. Setting any of these bits enables the respective error interrupt source
in the ERROR register. This register contains the hex value 0000 after a reset (all errors
disabled).
Table 4-10. Error Interrupt Status Register
BIT
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
OFFSET
02h
Error Mask Error Status
FIELD
BITSERR
///
DMAERR
BTOERR
DFN8
CRC16
CRC5EOF
PIDERR
BITSERR
///
DMAERR
BTOERR
DFN8
CRC16
CRC5EOF
PIDERR
RESET
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
RW
R
W
R
W
R
W
R
W
R
W
R
W
R
W
R
W
R
W
R
W
R
W
R
W
R
W
R
W
R
W
R
W
Table 4-11. 16- Error Interrupt Status Register Definitions
Bits Field Name Description
15 BITSERR
Enable/Disable BITSERR Interrupt
1 = enable the BITSERR interrupt.
0 = disable the BITSERR interrupt (default).
14 ///
Reserved
13 DMAERR
Enable/Disable DMAERR Interrupt
1 = enable the DMAERR interrupt.
0 = disable the DMAERR interrupt (default).
12 BTOERR
Enable/Disable BTOERR Interrupt
1 = enable the BTOERR interrupt.
0 = disable the BTOERR interrupt (default).
11 DFN8
Enable/Disable DFN8 Interrupt
1 = enable the DFN8 interrupt.
0 = disable the DFN8 interrupt (default).
10 CRC16
Enable/Disable CRC16 Interrupt
1 = enable the CRC16 interrupt.
0 = disable the CRC16 interrupt (default).
9 CRC5\EOF
Enable/Disable CRC5/EOF Interrupt
1 = enable the CRC5/EOF interrupt.
0 = disable the CRC5/EOF interrupt (default).
8 PID_ERR
Enable/Disable PID_ERR Interrupt
1 = enable the PID_ERR interrupt.
0 = disable the PID_ERR interrupt (default).
7 BITSERR
Bit Stuff Error
1 = a bit stuff error has been detected. If this bit is set, the corresponding packet
will be rejected due to a bit stuff error.
0 = a bit stuff error has not been detected (default).
6 ///
Reserved