•
•
1-kbyte page
31
Virtual address
10 9
Physical address
10 9
0
0
28
28
0
0
VPN
Offset
PPN
Offset
4-kbyte page
31
Virtual address
12 11
Physical address
12 11
VPN
Offset
PPN
Offset
•
•
64-kbyte page
Virtual address
16 15
Physical address
16 15
31
0
0
28
0
0
VPN
Offset
PPN
Offset
1-Mbyte page
Virtual address
20 19
Physical address
20 19
31
28
VPN
Offset
PPN
Offset
Figure 3.8 Relationship between Page Size and Address Format
•
VPN: Virtual page number
For 1-kbyte page: upper 22 bits of virtual address
For 4-kbyte page: upper 20 bits of virtual address
For 64-kbyte page: upper 16 bits of virtual address
For 1-Mbyte page: upper 12 bits of virtual address
•
•
ASID: Address space identifier
Indicates the process that can access a virtual page.
In single virtual memory mode and user mode, or in multiple virtual memory mode, if the SH
bit is 0, this identifier is compared with the ASID in PTEH when address comparison is
performed.
SH: Share status bit
When 0, pages are not shared by processes.
When 1, pages are shared by processes.
Rev. 6.0, 07/02, page 72 of 986
RENESAS [ RENESAS TECHNOLOGY CORP ]
