Rev. 5.00, 09/03, page 67 of 760
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 sh aring between processes (SH = 0) but not
when there is sharing (SH = 1).
When s ing l e virt ual memory is supported (MMUCR. S V = 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 ob jects of address
comparis on are shown in f igure 3.8.
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 3.8 Objects of Address Comparison