SH7713 datasheet(237/904 Pages) RENESAS

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Section 5 Memory Management Unit (MMU)

Rev.1.50 Aug. 30, 2006 Page 197 of 860

REJ09B0288-0150

registered in index mode. When memory is shared by several processings, different pages must

be registered in each ASID.

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 5.10.

SH = 1 or

(SR.MD = 1 and

MMUCR.SV = 1)?

SZ = 0?

No (4-kbyte)

Yes

Yes (1-kbyte)

No (4-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 5.10 Objects of Address Comparison

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