NXP Semiconductors K32 L2A Series, Reference Manual, Page: 648 / 1379

by the execution of the Erase All Blocks command. After completion of the Erase All
Blocks command, access control is disabled until the next reset of the flash module or the
Read 1s All Blocks command is executed and fails (FSTAT[MGSTAT0] is set).
Table 24-30. Erase All Blocks Command Error Handling
Error Condition Error Bit
Command not available in current mode/security FSTAT[ACCERR]
Any region of the program flash memory is protected FSTAT[FPVIOL]
Any errors have been encountered during the verify operation
1
FSTAT[MGSTAT0]
1. User margin read may be run using the Read 1s All Blocks command to verify all bits are erased.
24.4.11.11.1 Triggering an Erase All External to the Flash Memory Module
The functionality of the Erase All Blocks/Erase All Blocks Unsecure command is also
available in an uncommanded fashion outside of the flash memory. Refer to the device's
Chip Configuration details for information on this functionality.
Before invoking the external erase all function, the FSTAT[ACCERR and PVIOL] flags
must be cleared and the FCCOB0 register must not contain 0x44. When invoked, the
erase-all function erases all program flash memory and the program flash erasable IFR
space regardless of the protection settings. If the post-erase verify passes, access control
determined by the contents of the FXACC registers is disabled and the routine then
releases security by setting the FSEC[SEC] field register to the unsecure state. The
security byte in the Flash Configuration Field is also programmed to the unsecure state.
The status of the erase-all request is reflected in the FCNFG[ERSAREQ] bit. The
FCNFG[ERSAREQ] bit is cleared once the operation completes and the normal FSTAT
error reporting is available, except FPVIOL, as described in
Erase All Blocks Command /
Erase All Blocks Unsecure Command .
24.4.11.12 Verify Backdoor Access Key Command
The Verify Backdoor Access Key command only executes if the mode and security
conditions are satisfied (see
Flash Commands by Mode ). Execution of the Verify
Backdoor Access Key command is further qualified by the FSEC[KEYEN] bits. The
Verify Backdoor Access Key command releases security if user-supplied keys in the
FCCOB match those stored in the Backdoor Comparison Key bytes of the Flash
Configuration Field (see
Flash Configuration Field Description ). The column labelled
Flash Configuration Field offset address shows the location of the matching byte in the
Flash Configuration Field.
Functional Description
K32 L2A Reference Manual, Rev. 2, 01/2020
648 NXP Semiconductors