Motorola ColdFire MCF5281 - Manual (Page 116)

ColdFire Flash Module (CFM)
6-4 Freescale Semiconductor
6.3 Memory Map
Figure 6-2 shows the memory map for the CFM array. The CFM array can reside anywhere in the memory
space of the MCU. The starting address of the array is determined by the CFM array base address which
must reside on a natural size boundary; that is, the CFM array base address must be an integer multiple of
the array size. The CFM register space must reside on a 64 byte boundary as determined by the CFM
register base address.
Figure 6-2 shows how multiple 32,768 by 16-bit Flash physical blocks interleave to
form a contiguous non-volatile memory space. Each pair of 32-bit blocks (even and odd) interleave every
4 bytes to form a 256-Kbyte section of memory.
NOTE
The CFM on the MCF5281 and MCF5214 is constructed with four banks of
32K x 16-bit Flash arrays to generate 256 Kbytes of 32-bit Flash memory.
Figure 6-2. CFM Array Memory Map
The CFM module has hardware interlocks to protect data from accidental corruption. The <<BLOCK
NAME>> memory array is logically divided into 16-Kbyte sectors for the purpose of data protection and
access control. A flexible scheme allows the protection of any combination of logical sectors (see
Section 6.3.4.4, “CFM Protection Register (CFMPROT) ”). A similar mechanism is available to control
supervisor/user and program/data space access to these sectors.
0x0007 FFFF
0x0004 000C
0x0000 0000
0x0000 0004
0x0000 0008
0x0000 000C
0x0003 FFFF
0x0004 0000
0x0004 0004
0x0004 0008
3H[1] 3L[1]
2H[1] 2L[1]
3H[0] 3L[0]
2H[0] 2L[0]
1H[1] 1L[1]
0H[1] 0L[1]
1H[1] 1L[1]
0H[0] 0L[0]
Logical Block 1 (256 Kbytes)
Memory
Array 2H
2H[31] 2L[31]
Memory
Array 2L
2H[0] 2L[0]
Flash Physical Block 2 Flash Physical Block 3
3H[31] 3L[31]
3H[0] 3L[0]
Memory
Array 3H
Memory
Array 3L
Logical Block 0 (256 Kbytes)
Memory
Array 0H
0H[31] 0L[31]
Memory
Array 0L
0H[0] 0L[0]
Flash Physical Block 0 Flash Physical Block 1
1H[31] 1L[31]
1H[0] 1L[0]
Memory
Array 1H
Memory
Array 1L
Each memory array = 64 Kbytes
(16 bits wide × 32K)
Each physical block = 128 Kbytes
(32 bits wide
× 32K)
Configuration Field
(0x0000_0400–
0x0000_0417)
1 The MCF5281 and MCF5214 support only Logical Block 0.
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3