NXP Semiconductors QorIQ LS1012A Reference Manual

26.8.2.2 AHB CommandsRefer to Section 1, Reading Serial Flash Data into the QuadSPI Module, in Flash Readfor additional details not explicitly covered in this paragraph.• AHB Commands - Normal OperationMemory mapped read access to a serial flash address not contained in the AHBBuffer, triggers the execution of an AHB Command. Given that this is a legalcommand the QSPI_SR[AHBACC] and the QSPI_SR[BUSY] bits are assertedsimultaneously immediately after the execution is started. When the instruction onthe serial flash device has been finished these bits are de-asserted.• IP Commands - Error SituationsRefer to Table 26-25 below.26.8.2.3 Overview of Error FlagsThe following table gives an overview of the different error flags in the QSPI_FR registerand additional error-related details.Table 26-25. Overview of QSPI_FR Error FlagsError Category Error Flag inQSPI_FRCommand Execution on Serial FlashDeviceTFF Behavior (in case of IP commandsonly)DescriptionAHB Error Flag ABSEF Flash transaction is aborted AHB sequence contains• WRITE instructionAHB Error Flag ABOF Flash transaction continues until it finishesSet when the module tried to pushdata into the AHB buffer thatexceeded the size of the AHB buffer.Only occurs due to wrongprogramming of theQSPI_BUFxCR[ADATSZ].Miscellaneous ErrorFlag ILLINE Flash transaction abortedIllegal instruction Error Flag – Setwhen an illegal instruction isencountered by the controller in anyof the sequences.Command ArbitrationError IPIEF TFF not asserted in conjunction with thatcommandIP Command Error - caused whenIP access is currently in progress(IP_ACC set) and• write attempt to QSPI_IPCRregister.Table continues on the next page...Initialization/Application InformationQorIQ LS1012A Reference Manual, Rev. 1, 01/20181496 NXP Semiconductors