Circuit Board Reference Manual

MCF548x Reference Manual, Rev. 3
29-24 Freescale Semiconductor
29.2.3.2 USB Dropped Packet Counter Register (DPCNT)
29.2.3.3 USB CRC Error Counter Register (CRCECNT)
29.2.3.4 USB Bitstuffing Error Counter Register (BSECNT)
1514131211109876543210
R DPCNT
W
Reset0000000000000000
Reg
Addr
MBAR + 0xB082
Figure 29-19. USB Dropped Packet Counter Register (DPCNT)
Table 29-19. DPCNT Field Descriptions
Bits Name Description
15–0 DPCNT Packet dropped counter. This register counts the number of packets that have been
dropped by the USB due to errors.
1514131211109876543210
R CRCECNT
W
Reset0000000000000000
Reg
Addr
MBAR + 0xB084
Figure 29-20. USB CCR Error Counter Register (CRCECNT)
Table 29-20. CRCECNT Field Descriptions
Bits Name Description
15–0 CRCECNT CRC error counter. This register counts the occurrences of CRC errors in token and data
packets received by the USB.
1514131211109876543210
R BSECNT
W
Reset0000000000000000
Reg
Addr
MBAR + 0xB086
Figure 29-21. USB Bitstuffing Error Counter Register (BSECNT)