Motorola ColdFire MCF5282 User Manual download pdf (Page 19)

Chapter 1. M5282EVB 1-7

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

System Memory

performed under CPU control through a command driven interface to an internal state machine.

All Flash physical blocks can be programmed or erased at the same time; however, it is not possible

to read from a Flash physical block while the same block is being programmed or erased. The array

used in the MCF5282 makes it possible to program or erase one pair of Flash physical blocks under

the control of software routines executing out of another pair.

Please refer to the MCF5282 User’s Manual for more details.

1.2.6 M5282EVB Memory Map

Interface signals to support interface to external memory and peripheral devices are generated by

the memory controller. The MCF5282 supports 7 external chip selects, however three of them are

multiplexed with external address lines. CS[1:0]

are used with external memories and CS[3:2] are

easily accessible to users through the daughter card expansion connectors. CS[0] also functions as

the global (boot) chip-select for booting out of external flash.

Since the MCF5282 chip selects are fully programmable, the memory banks may be located at any

any 64-KByte boundary within the processor’s four gigabyte address space.

Following is the default memory map for this board as configured by the Debug Monitor located

in the external Flash bank. The internal memory space of the MCF5282 is detailed further in the

MCF5282 Users Manual. Chip Selects 0-3 can be changed by user software to map the external

memory in different locations but the chip select configuration such as wait states and transfer

acknowledge for each memory type should be maintained.

Possible Chip Select usage:

External FLASH Memory CS0 or CS1 default CS0 (JP6 =1&2,3&4)

External SRAM Memory CS0 or CS1 default CS1 (JP6 =1&2,3&4)

Table 1-1 shows the M5282EVB memory map.

1.2.6.1 CS0 selection

When booting from an external device, the MCF5282 accesses this device using CS0. CS0 can be

configured to connect to the external flash or external SRAM.

Table 1-1. The M5282EVB Default Memory Map

Address Range Signal and Device

0x0000_0000 - 0x00FF_FFFF 16 Mbyte SDRAM

0x2000_0000 - 0x2000_0000 64 Kbytes Internal SRAM

0x3000_0000 - 0x3000_0000 External SRAM (not fitted)

0xF000_0000 - 0xF007_FFFF 512 Kbytes Internal Flash

0xFFE0_0000 - 0xFFFF_FFFF 2 Mbytes External Flash

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 103 104

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Motorola ColdFire MCF5282 User Manual Page 19