CHAPTER 3 CPU FUNCTIONS
3.4.2 Image
Up to 16 MB of external memory area in a linear address space (program area) of up to 16 MB, internal ROM area,
and internal RAM area are supported for instruction address addressing. During operand addressing (data access),
up to 4 GB of linear address space (data space) is supported. However, the 4 GB address space is viewed as 64
images of a 64 MB physical address space. In other words, the same 64 MB physical address space is accessed
regardless of the value of bits 31 to 26.
Figure 3-2. Address Space Image
Image 63
4 GB
•
•
•
Data space
On-chip peripheral I/O area
Program space
Image 1
Internal RAM area
Reserved area
Internal RAM area
Access-prohibited area
64 MB
Access-prohibited area
External memory area
64 MB
External memory area
Image 0
Internal ROM area
(external memory)
16 MB
Internal ROM area
(external memory)
User’s Manual U15862EJ3V0UD
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NEC [ NEC ]
