Quad Serial Peripheral Interface (QuadSPI)MPC5606S Microcontroller Reference Manual, Rev. 71062 Freescale Semiconductor30.6.6.3 Overview of error flagsTable 30-50 below gives an overview of the different error flags in the QSPI_SFMFR register andadditional error-related details.Note that only the buffer related errors are related to a transaction on the external serial flash. All the othererrors do not trigger an actual transaction.30.6.6.4 IP bus and AHB Access command collisionsThere are two flags related to this topic, the QSPI_SFMFR[IPAEF] and QSPI_SFMFR[IPIEF]. Refer toSection 30.5.3.3.1, Reading Serial Flash Data into the QuadSPI Module, for a description of the flags itselfand to Section 30.6.7, Command arbitration—SFM mode only, for details about possible commandcollisions.30.6.7 Command arbitration—SFM mode onlyIn case of coinciding or overlapping commands the arbitration scheme is as follows: During the executionof an IP Bus related command the running command can’t be terminated by issuing another IP Bus or AHBTable 30-50. Overview of QSPI_SFMFR error flagsError category Error flag inQSPI_SFMFRCommand Execution on serial flashdeviceTFF BehaviorDescriptionCommand arbitrationerrorsIPIEFno TFF not asserted in conjunctionwith that command• IP Command alreadyrunning, another IPCommand could not beexecuted.• IP Command alreadyrunning, write attempt toQSPI_ICR register.• IP Command alreadyrunning, write attempt toQSPI_SFAR register.IPAEF • AHB Command alreadyrunning, another IPCommand could not beexecuted.• AHB Command alreadyrunning, write attempt toQSPI_ICR[IC] field.Instruction code error ICEF no TFF not asserted in conjunctionwith that command• Instruction Code Error orMode Bit Collision11 Refer to Section 30.4.3.19, Serial Flash Mode Status Register (QSPI_SFMSR), SFMSR[CONTMODE] for thedescription of a mode bit collisionBuffer related errorsRBOFyes TFF is asserted on completion• RX Buffer OverrunTBUF • TX Buffer UnderrunABOF • AHB Buffer Overrun
