Memory Map/Register Definitions - NXP Semiconductors MKL27Z128VFM4 Reference Manual

Table of Contents

Table 33-6. USB responses to DMA overrun errors (continued)

Errors due to Memory Latency

• For host mode, the TOKDNE interrupt is generated and

the TOK_PID field of the BDT is 1111 to indicate the

DMA latency error. Host mode software can decide to

retry or move to next scheduled item.

• In device mode, the BDT is not written back nor is the

TOKDNE interrupt triggered because it is assumed that

a second attempt is queued and will succeed in the

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 definitions

This section provides the memory map and detailed descriptions of all USB interface

Peripheral ID register (USB0_PERID)

Peripheral ID Complement register (USB0_IDCOMP)

Peripheral Revision register (USB0_REV)

4007_200C Peripheral Additional Info register (USB0_ADDINFO)

Interrupt Status register (USB0_ISTAT)

Interrupt Enable register (USB0_INTEN)

Error Interrupt Status register (USB0_ERRSTAT)

4007_208C Error Interrupt Enable register (USB0_ERREN)

Status register (USB0_STAT)

Control register (USB0_CTL)

Address register (USB0_ADDR)

4007_209C BDT Page register 1 (USB0_BDTPAGE1)

Frame Number register Low (USB0_FRMNUML)

Frame Number register High (USB0_FRMNUMH)

BDT Page Register 2 (USB0_BDTPAGE2)

Freescale Semiconductor, Inc.

USB memory map

Table continues on the next page...

KL27 Sub-Family Reference Manual , Rev. 5, 01/2016

Chapter 33 Universal Serial Bus (USB) FS Subsystem

Errors due to Oversized Packets

The packet length field written back to the BDT is the

MaxPacket value that represents the length of the clipped

data actually written to memory.