r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 175

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

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.
Process 1
Physical
Memory
(0)
Process 1
Process 2
Process 3
Process 1
Figure 7.1 Role of MMU
Physical
Memory
Physical
Memory
(1)
(3)
Process 1
Process 1
Process 2
Process 3
Rev.1.00 Jan. 10, 2008 Page 145 of 1658
7. Memory Management Unit (MMU)
Virtual
Memory
Virtual
Memory
MMU
MMU
REJ09B0261-0100
Physical
Memory
Physical
Memory
(2)
(4)