Motorola MVME2400 Series Wartungshandbuch Seite 205

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Functional Description
http://www.mcg.mot.com/literature 3-19
3
b. all reads are allowed (multiple accesses are performed to the
ROM/Flash devices when the read is for greater than one byte).
When the width status bit is set, the block’s ROM/Flash is
considered to be 64 bits wide, where each half of the SMC interfaces
with 32 bits. In this mode, the following rules are enforced:
a. only aligned, 4-byte writes should be attempted (all other sizes
are ignored), and
b. all reads are allowed (multiple accesses to the ROM/Flash
device are performed for burst reads).
More information about ROM/Flash is found in the section on SMC
Registers in this chapter.
In order to place code correctly in the ROM/Flash devices, address
mapping information is required. Table 3-7 shows how PowerPC 60x
addresses map to the ROM/Flash addresses when ROM/Flash is 16 bits
wide. Table 3-8 shows how they map when Flash is 64 bits wide.
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