Figure 3.8 Relationship Between Page Size And Address Format - Hitachi SH7750 Hardware Manual

• 1-kbyte page
Virtual address
31
VPN
• 4-kbyte page
Virtual address
31
VPN
• 64-kbyte page
Virtual address
31
VPN
• 1-Mbyte page
Virtual address
31 20 19
VPN

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
10 9
Offset
12 11
Offset
16 15
Offset
Offset
0 28
0 28
0 28
PPN
0 28
PPN
Physical address
10 9
PPN Offset
Physical address
12 11
PPN Offset
Physical address
16 15
Offset
Physical address
20 19
Offset
0
0
0
0