Motorola MCF5282, MCF5281 user manual CFM Array Memory Map

Memory Map

6.3Memory Map

Figure 6-2shows 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 6-2shows 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 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

0x0004 0008

0x0004 0004

0x0004 0000

0x0003 FFFF

Configuration Field (0x0000_0400– 0x0000_0417)

0x0000 000C

0x0000 0008

0x0000 0004

0x0000 0000

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)
Flash Physical Block 2					Flash Physical Block 3
	2H[31]	2L[31]				3H[31]		3L[31]
	Memory	Memory			Memory		Memory
	Array 2H	Array 2L			Array 3H		Array 3L
	2H[0]		2L[0]			3H[0]		3L[0]
		Logical Block 0 (256 Kbytes)
Flash Physical Block 0					Flash Physical Block 1
	0H[31]	0L[31]				1H[31]		1L[31]
	Memory	Memory			Memory		Memory
	Array 0H	Array 0L			Array 1H		Array 1L
	0H[0]		0L[0]			1H[0]		1L[0]
				Each memory array = 64 Kbytes
								(16 bits wide ⋅ 32K)
		Each physical block = 128 Kbytes
						(32 bits wide ⋅ 32K)

1The MCF5281 supports only Logical Block 0.

Figure 6-2. CFM Array Memory Map

6-4 MCF5282 User’s Manual MOTOROLA