Memory Map; Cfm Array Memory Map - Motorola ColdFire MCF5281 User Manual

Memory Map

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.
The CFM on the MCF5281 is constructed with four banks of
32K x 16-bit Flash arrays to generate 256 Kbytes of 32-bit
Flash memory.
0x0007 FFFF
0x0004 000C 3H[1]
0x0004 0008 2H[1]
0x0004 0004 3H[0]
0x0004 0000 2H[0]
0x0003 FFFF
Configuration Field
(0x0000_0400–
0x0000_0417)
0x0000 000C 1H[1]
0x0000 0008 0H[1]
0x0000 0004 1H[1]
0x0000 0000 0H[0]
1
The MCF5281 supports only Logical Block 0.
6-4
NOTE
Flash Physical Block 2
3L[1]
2L[1]
3L[0]
2L[0]
Flash Physical Block 0
1L[1]
0L[1]
1L[1]
0L[0]
Figure 6-2. CFM Array Memory Map
MCF5282 User's Manual
Logical Block 1 (256 Kbytes)
Flash Physical Block 3
2H[31] 2L[31]
Memory Memory
Memory
Array 2H Array 3H
Array 2L
2H[0] 2L[0]
Logical Block 0 (256 Kbytes)
Flash Physical Block 1
0H[31] 0L[31]
Memory Memory
Memory
Array 0H Array 0L Array 1H
0H[0] 0L[0]
Each memory array = 64 Kbytes
Each physical block = 128 Kbytes
3H[31] 3L[31]
Memory
Array 3L
3H[0] 3L[0]
1H[31] 1L[31]
Memory
Array 1L
1H[0] 1L[0]
(16 bits wide × 32K)
(32 bits wide × 32K)
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