NXP Semiconductors MWCT101 S Series, Reference Manual

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32.5.13.13 CMD_LOAD_KEY
The LOAD KEY command updates an internal key per the SHE specification. If a
protected key is loaded into the RAM_KEY, the function has to disable the plain key
status bit.
Table 32-72. LOAD_KEY command details
Parameter Direction Width
KEY_ID IN 5
M1 IN 128
M2 IN 256
M3 IN 128
M4 OUT 256
M5 OUT 128
Error Codes: ERC_NO_ERROR, ERC_SEQUENCE_ERROR, ERC_KEY_NOT_AVAILABLE,
ERC_KEY_INVALID,ERC_KEY_WRITE_PROTECTED, ERC_KEY_UPDATE_ERROR, ERC_KEY_EMPTY,
ERC_MEMORY_FAILURE, ERC_BUSY, ERC_GENERAL_ERROR
NOTE
1. Due to extension of the maximum number of keys (beyond
SHE specification) and the usage of KBS to identify the
higher and lower order keys, M1 entry will follow the
traditional SHE specifications (requiring the two 4-bit ID
and AuthID entries along with UID), but the command will
need more information showing which KBS (0 or 1) is
requested. This will be communicated by an additional
requirement of entering the KEY_ID ({KBS,KeyIDx[3:0]}.
Lastly, the KeyIDx[3:0] in M1 must be consistent with the
KeyIDx[3:0] in the 5-bit KEY_ID entry in the command
header.
2. If the key AuthID is empty, the key update can work with
AuthID = ID and Auth_value = all F's; otherwise
ERC_KEY_UPDATE_ERROR is returned.
3. When updating BOOT_MAC, KBS must be set to 0
(KBS=1 will generate an error)
The PGMPART configuration (see Program Partition Command) allows for an extension
to the SHE specification in which the user may enable a VERIFY_ONLY flag for the
GENERATE_MAC to take into consideration. For the VERIFY_ONLY attribute, if set,
the associated memory key slot will be treated as invalid by the
CMD_GENERATE_MAC command (only valid for CMD_VERIFY_MAC). The
VERIFY_ONLY attribute has no effect if KEY_USAGE == 0.
Chapter 32 Flash Memory Module (FTFC)
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
NXP Semiconductors 801