NXP Semiconductors K32 L2A Series, Reference Manual, Page: 651 / 1379

24.4.11.14 Read 1s All Execute-only Segments Command
The Read 1s All Execute-only Segments command checks if the program flash execute-
only segments defined by the FXACC registers have been erased to the specified read
margin level, if applicable, and releases flash access control if the readout passes, i.e. all
data reads as '1'.
Table 24-35. Read 1s All Execute-only Segments Command FCCOB Requirements
FCCOB Number FCCOB Contents [7:0]
0 0x4A (RD1XA)
1 Read-1 Margin Choice
After clearing CCIF to launch the Read 1s All Execute-only Segments command, the
flash memory module :
• sets the read margin for 1s according to Table 24-36 ,
• checks the contents of the program flash execute-only segments are in the erased
state.
If the flash memory module confirms that these segments are erased, flash access control
is disabled until the next reset or, after programming any of the execute-only segments,
the Read 1s All Execute-only Segments command is executed and fails with the
FSTAT[MGSTAT0] bit set. If the read fails, i.e. all segments are not in the fully erased
state, the FSTAT[MGSTAT0] bit is set.
The CCIF flag sets after the Read 1s All Execute-only Segments operation has
completed.
Table 24-36. Margin Level Choices for Read 1s All Execute-only Segments
Read Margin Choice Margin Level Description
0x00 Use the 'normal' read level for 1s
0x01 Apply the 'User' margin to the normal read-1 level
0x02 Apply the 'Factory' margin to the normal read-1 level
Table 24-37. Read 1s All Execute-only Segments Command Error Handling
Error Condition Error Bit
Command not available in current mode/security FSTAT[ACCERR]
An invalid margin choice is specified FSTAT[ACCERR]
Sector size is larger than segment size FSTAT[ACCERR]
Read-1s fails FSTAT[MGSTAT0]
Chapter 24 Flash Memory Module (FTFA)
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors 651