PXD10RM Datasheet, PDF (1074/1332 Pages) Freescale Semiconductor, Inc – PXD10 Microcontroller

30.6.6.3 Overview of Error Flags
Table 30-50 below gives an overview of the different error flags in the QSPI_SFMFR register and
additional error-related details.
Table 30-50. Overview of QSPI_SFMFR Error Flags
Error Category
Error Flag in
QSPI_SFMFR
Command Execution on Serial Flash
Device
TFF Behavior
Description
Command Arbitration
Errors
IPIEF
no  TFF not asserted in conjunction
with that command
• IP Command already
running, another IP
Command could not be
executed.
• IP Command already
running, write attempt to
QSPI_ICR register.
• IP Command already
running, write attempt to
QSPI_SFAR register.
Instruction Code Error
IPAEF
ICEF
• AHB Command already
running, another IP
Command could not be
executed.
• AHB Command already
running, write attempt to
QSPI_ICR[IC] field.
no  TFF not asserted in conjunction • Instruction Code Error or
with that command
Mode Bit Collision¹
Buffer Related Errors
RBOF
TBUF
• RX Buffer Overrun
yes  TFF is asserted on completion • TX Buffer Underrun
ABOF
• AHB Buffer Overrun
1 _{Refer to Section 30.4.3.19, Serial Flash Mode Status Register (QSPI_SFMSR)” SFMSR[CONTMODE] for the}
description of a Mode Bit collision
Note that only the buffer related errors are related to a transaction on the external serial flash. All the other
errors do not trigger an actual transaction.
30.6.6.4 IP Bus and AHB Access Command Collisions
There are two flags related to this topic, the QSPI_SFMFR[IPAEF] and QSPI_SFMFR[IPIEF]. Refer to
Section 30.5.3.3.1, Reading Serial Flash Data into the QuadSPI Module” for a description of the flags
itself and to Section 30.6.7, Command Arbitration - SFM Mode Only” for details about possible command
collisions.
30.6.7 Command Arbitration - SFM Mode Only
In case of coinciding or overlapping commands the arbitration scheme is as follows: During the execution
of an IP Bus related command the running command can’t be terminated by issuing another IP Bus or AHB
30-70
PXD10 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
Freescale Semiconductor