PXD20RM Datasheet, PDF (1253/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

Table 35-35. 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
IPAEF
no -> TFF not asserted in conjunction
with that command
Attempt to trigger IP Command
not be executed.
• IP Command already running,
write attempt to QSPI_IC
register.
• IP Command running,
attempt to write QSPI_SFAR
register.
• IP Command running,
attempt to write QSPI_RBCT
register.
• AHB Command already
running, another IP
Command could not be
executed.
• AHB Command already
running, write attempt to
QSPI_ICR[IC] field.
IPGEF
• Exclusive access to the serial
flash granted for AHB
Commands, write attempt to
QSPI_ICR[IC] field.
AHB Command Errors
IP Command Errors
ABCEF
ABMEF
IUEF
ICEF
IMEF
no -> TFF not asserted in conjunction
with that command
• AHB Command Error
• AHB Command Mode Error¹
• IP Command Usage Error
• IP Command Error
• IP Command Mode Error¹
Buffer Related Errors
RBOF
TBUF
• RX Buffer Overrun
yes -> TFF is asserted on completion
• TX Buffer Underrun
1 _{Refer to Section 35.6.6, Continuous Mode Commands, 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.
35.6.2.4 IP bus and AHB access command collisions
There are two flags related to this topic, the QSPI_SFMFR[IPAEF] and QSPI_SFMFR[IPIEF]. See
Section 35.5.3.3.1, Reading Serial Flash Data into the QuadSPI Module, for a description of the flags itself
and to Section 35.6.4, Command arbitration, for details about possible command collisions.
Freescale Semiconductor
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
35-43