HD6417705 Datasheet, PDF (125/739 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperH RISC engine Family/SH7700 Series

The object compared varies depending on the page management information (SZ, SH) in the TLB
entry. It also varies depending on whether the system supports multiple virtual memory or single
virtual memory.
The page-size information determines whether VPN (11 to 10) is compared. VPN (11 to 10) is
compared for 1-kbyte pages (SZ = 0) but not for 4-kbyte pages (SZ = 1).
The sharing information (SH) determines whether the PTEH. ASID and the ASID in the TLB
entry are compared. ASIDs are compared when there is no sharing between processes (SH = 0) but
not when there is sharing (SH = 1).
When single virtual memory is supported (MMUCR.SV = 1) and privileged mode is engaged
(SR.MD = 1), all process resources can be accessed. This means that ASIDs are not compared
when single virtual memory is supported and privileged mode is engaged. The objects of address
comparison are shown in figure 3.10.
SH = 1 or
No
(SR.MD = 1 and
MMUCR.SV = 1)?
Yes
SZ = 0?
No (4 kbytes)
SZ = 0?
No (4 kbytes)
Yes (1 kbyte)
Yes (1 kbyte)
Bits compared:
VPN 31 to 17
VPN 11 to 10
Bits compared:
VPN 31 to 17
Bits compared:
VPN 31 to 17
VPN 11 to 10
ASID 7 to 0
Bits compared:
VPN 31 to 17
ASID 7 to 0
Figure 3.10 Objects of Address Comparison
Rev. 2.00, 09/03, page 79 of 690