TC1784
Program Memory Unit (PMU)
User´s Manual
5-26
V1.1, 2011-05
PMU, V1.47
5.6.3
Functional Description
In the following chapters, the detailed Flash functions and the related user interface are
described.
5.6.3.1
Address Mapping
The total address range of 4 Gbyte (addresses A31–A0) is divided into 16 segments of
each 256 Mbyte, which are addressed by A31–A28. The Program Flash as well as the
Data Flash are located in segment A
H
for non-cached accesses, and in segment 8
H
for
cached accesses. Thus the segment address bits are:
•
A31–A28 = 8
H
for all cached Flash accesses, and
•
A31–A28 = A
H
for all non-cached Flash accesses.
Note: Data accesses to Overlay Memory shall only be performed in the non-cached
address space to bypass the cache/line buffer in the DMI module (necessary for
data consistency after write).
Note: Command sequence cycles to the Flash shall be mapped always to the non-
cached address space of the Flash which shall be operated on.
The following table
presents a summary of address mappings for the Program
Flash and Data Flash, and of related Flash register address mappings in PMU0.
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