Renesas SH7781 - Manual (Page 175)

7. Memory Management Unit (MMU)
Rev.1.00 Jan. 10, 2008 Page 145 of 1658
REJ09B0261-0100
There are two methods by which the MMU can perform mapping from virtual memory to physical
memory: the paging method, using fixed-length address translation, and the segment method,
using variable-length address translation. With the paging method, the unit of translation is a
fixed-size address space called a page.
In the following descriptions, the address space in virtual memory in this LSI is referred to as
virtual address space, and the address space in physical memory as physical address space.
MMU
MMU
Process 1
Physical
Memory
(1)
(0)
(2)
(3) (4)
Physical
Memory
Physical
Memory
Physical
Memory
Virtual
Memory
Virtual
Memory
Physical
Memory
Process 1
Process 1
Process 2
Process 3
Process 1
Process 1
Process 2
Process 3
Figure 7.1 Role of MMU