Table 33-6. USB responses to DMA overrun errors (continued)Errors due to Memory Latency Errors due to Oversized Packets• For host mode, the TOKDNE interrupt is generated andthe TOK_PID field of the BDT is 1111 to indicate theDMA latency error. Host mode software can decide toretry or move to next scheduled item.• In device mode, the BDT is not written back nor is theTOKDNE interrupt triggered because it is assumed thata second attempt is queued and will succeed in thefuture.The packet length field written back to the BDT is theMaxPacket value that represents the length of the clippeddata actually written to memory.From here, the software can decide an appropriate course of action for future transactions such as stalling the endpoint,canceling the transfer, disabling the endpoint, etc.33.5 Memory map/Register definitionsThis section provides the memory map and detailed descriptions of all USB interfaceregisters.USB memory mapAbsoluteaddress(hex)Register name Width(in bits) Access Reset value Section/page4007_2000 Peripheral ID register (USB0_PERID) 8 R 04h 33.5.1/5434007_2004 Peripheral ID Complement register (USB0_IDCOMP) 8 R FBh 33.5.2/5434007_2008 Peripheral Revision register (USB0_REV) 8 R 33h 33.5.3/5444007_200C Peripheral Additional Info register (USB0_ADDINFO) 8 R 01h 33.5.4/5444007_2080 Interrupt Status register (USB0_ISTAT) 8 R/W 00h 33.5.5/5454007_2084 Interrupt Enable register (USB0_INTEN) 8 R/W 00h 33.5.6/5464007_2088 Error Interrupt Status register (USB0_ERRSTAT) 8 R/W 00h 33.5.7/5474007_208C Error Interrupt Enable register (USB0_ERREN) 8 R/W 00h 33.5.8/5484007_2090 Status register (USB0_STAT) 8 R 00h 33.5.9/5494007_2094 Control register (USB0_CTL) 8 R/W 00h 33.5.10/5504007_2098 Address register (USB0_ADDR) 8 R/W 00h 33.5.11/5514007_209C BDT Page register 1 (USB0_BDTPAGE1) 8 R/W 00h 33.5.12/5514007_20A0 Frame Number register Low (USB0_FRMNUML) 8 R/W 00h 33.5.13/5524007_20A4 Frame Number register High (USB0_FRMNUMH) 8 R/W 00h 33.5.14/5524007_20B0 BDT Page Register 2 (USB0_BDTPAGE2) 8 R/W 00h 33.5.15/553Table continues on the next page...Chapter 33 Universal Serial Bus (USB) FS SubsystemKL27 Sub-Family Reference Manual , Rev. 5, 01/2016Freescale Semiconductor, Inc. 541
