Table 17-24. Erase Flash Sector Command Error Handling (continued)
Error Condition
Error Bit
The selected program flash sector is located in an XA controlled segment and the Erase All
Blocks, Erase All Blocks Unsecure or the Read 1s All Blocks command has not successfully
completed since the last reset
FSTAT[FPVIOL]
Any errors have been encountered during the verify operation
FSTAT[MGSTAT0]
1. User margin read may be run using the Read 1s Section command to verify all bits are erased.
17.5.11.7.1 Suspending an Erase Flash Sector Operation
To suspend an Erase Flash Sector operation set the FCNFG[ERSSUSP] bit when CCIF,
ACCERR, and FPVIOL are clear and the CCOB command field holds the code for the
Erase Flash Sector command. During the Erase Flash Sector operation (see
), the flash samples the state of the ERSSUSP bit at convenient points. If
the FTFE detects that the ERSSUSP bit is set, the Erase Flash Sector operation is
suspended and the FTFE sets CCIF. While ERSSUSP is set, all writes to flash registers
are ignored except for writes to the FSTAT and FCNFG registers.
If an Erase Flash Sector operation effectively completes before the FTFE detects that a
suspend request has been made, the FTFE clears the ERSSUSP bit prior to setting CCIF.
When an Erase Flash Sector operation has been successfully suspended, the FTFE sets
CCIF and leaves the ERSSUSP bit set. While CCIF is set, the ERSSUSP bit can only be
cleared to prevent the withdrawal of a suspend request before the FTFE has
acknowledged it.
17.5.11.7.2 Resuming a Suspended Erase Flash Sector Operation
If the ERSSUSP bit is still set when CCIF is cleared to launch the next command, the
previous Erase Flash Sector operation resumes. The FTFE acknowledges the request to
resume a suspended operation by clearing the ERSSUSP bit. A new suspend request can
then be made by setting ERSSUSP. A single Erase Flash Sector operation can be
suspended and resumed multiple times.
There is a minimum elapsed time limit of 4.3 msec between the request to resume the
Erase Flash Sector operation (CCIF is cleared) and the request to suspend the operation
again (ERSSUSP is set). This minimum time period is required to ensure that the Erase
Flash Sector operation will eventually complete. If the minimum period is continually
violated, i.e. the suspend requests come repeatedly and too quickly, no forward progress
is made by the Erase Flash Sector algorithm. The resume/suspend sequence runs
indefinitely without completing the erase.
Chapter 17 Flash Memory Module (FTFE)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
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