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Table 28-65. Verify Backdoor Access Key Command Error Handling
Error Condition Error Bit
The supplied key is all-0s or all-Fs FSTAT[ACCERR]
An incorrect backdoor key is supplied FSTAT[ACCERR]
Backdoor key access has not been enabled (see the description of the FSEC register) FSTAT[ACCERR]
This command is launched and the backdoor key has mismatched since the last power down
reset
FSTAT[ACCERR]
28.4.11.14 Program Partition Command
The Program Partition command prepares the FlexNVM block for use as data flash,
EEPROM backup, or a combination of both and initializes the FlexRAM. The Program
Partition command must not be launched from flash memory, since flash memory
resources are not accessible during Program Partition command execution.
CAUTION
While different partitions of the FlexNVM are available, the
intention is that a single partition choice is used throughout the
entire lifetime of a given application. The FlexNVM Partition
Code choices affect the endurance and data retention
characteristics of the device.
Table 28-66. Program Partition Command FCCOB Requirements
FCCOB Number FCCOB Contents [7:0]
0 0x80 (PGMPART)
1 Not Used
2 Not Used
3 Not Used
4 EEPROM Data Size Code
1
5 FlexNVM Partition Code
2
1. See Table 28-67 and EEPROM Data Set Size
2. See Table 28-68 and
Table 28-67. Valid EEPROM Data Set Size Codes
EEPROM Data Size Code (FCCOB4)
1
EEPROM Data Set Size (Bytes)
FCCOB4[5:4] FCCOB4[EEESIZE]
11 0xF 0
2
11 0x9 32
11 0x8 64
Table continues on the next page...
Chapter 28 Flash Memory Module (FTFL)
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
Freescale Semiconductor, Inc.
Preliminary
635
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