Flash Access Protection - NXP Semiconductors freescale KV4 Series Reference Manual

32.4.2 Flash Access Protection

Individual segments within the program flash memory can be designated for restricted
access. Specific flash commands (Program Check, Program Longword, Erase Flash
Sector) monitor FXACC contents to protect flash memory but the FSACC contents do
not impact flash command operation. Access is controlled by the following registers:
• FTFA_XACC —
n
• For 2 program flash sizes greater than 128KB, eight registers control 64
segments of the program flash memory as shown in the following figure
Last program flash address
Figure 32-45. Program flash access control (256KB or 512KB of program flash)
• FTFA_SACC —
n
• For 2 program flash sizes greater than 128KB, eight registers control 64
segments of the program flash memory as shown in the following figure
Freescale Semiconductor, Inc.
Program flash
0x0_0000
Program flash size / 64
Program flash size / 64
Program flash size / 64
Program flash size / 64
Program flash size / 64
Program flash size / 64
Program flash size / 64
Program flash size / 64
Program flash size / 64
Program flash size / 64
Program flash size / 64
Program flash size / 64
KV4x Reference Manual, Rev. 2, 02/2015
Preliminary
Chapter 32 Flash Memory Module (FTFA)
XACCL3[XA0]
XACCL3[XA1]
XACCL3[XA2]
XACCL3[XA3]
XACCL3[XA4]
XACCL0[XA31]
XACCH3[XA32]
XACCH0[XA59]
XACCH0[XA60]
XACCH0[XA61]
XACCH0[XA62]
XACCH0[XA63]
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