71
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 3.9.
Bits compared:
VPN (31–17)
VPN (11–10)
SZ = 0?
Yes
No
Yes (1 kbyte)
No (4 kbytes)
Bits compared:
VPN (31–17)
Bits compared:
VPN (31–17)
VPN (11–10)
ASID (7–0)
SZ = 0?
Yes (1 kbyte)
No (4 kbytes)
Bits compared:
VPN (31–17)
ASID (7–0)
SH = 1 or
(SR.MD = 1 and
MMUCR.SV = 1)?
Figure 3.9 Objects of Address Comparison
Содержание SH7709S
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Страница 292: ...273 T1 CKIO A25 to A0 CSn RD WR RD D31 to D0 WEn D31 to D0 BS T2 Read Write Figure 10 6 Basic Timing of Basic Interface ...
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