Hardware Itlb Miss Handling - Hitachi SH7750 series Hardware Manual

MMUCR
31
Entry specification
PTEH
31
VPN
Entry 0 ASID [7:0]
Entry 1 ASID [7:0]
Entry 2 ASID [7:0]
Entry 63 ASID [7:0] VPN [31:10] V
3.5.4

Hardware ITLB Miss Handling

In an instruction access, the SH7750 Series searches the ITLB. If it cannot find the necessary
address translation information (i.e. in the event of an ITLB miss), the UTLB is searched by
hardware, and if the necessary address translation information is present, it is recorded in the
ITLB. This procedure is known as hardware ITLB miss handling. If the necessary address
translation information is not found in the UTLB search, an instruction TLB miss exception is
generated and processing passes to software.
Rev. 4.0, 04/00, page 46 of 850
26 25 24 23
LRUI — URB
10 9 8 7
— ASID
VPN [31:10] V
VPN [31:10] V
VPN [31:10] V
Figure 3.12 Operation of LDTLB Instruction
18 17 16 15 10 9 8 7
— URC
PTEL
31
—
0
PTEA
31
Write
PPN [28:10] SZ [1:0]
PPN [28:10] SZ [1:0]
PPN [28:10] SZ [1:0]
PPN [28:10] SZ [1:0] SH C PR [1:0]
UTLB
3 2 1 0
SV — TI — AT
SQMD
29 28 10 9 8 7 6 5 4 3 2 1 0
PPN — V SZ PR SZ C D SHWT
—
SH C PR [1:0] D WT
SH C PR [1:0] D WT
SH C PR [1:0] D WT
D WT
4 3 2 0
TC SA
SA [2:0] TC
SA [2:0] TC
SA [2:0] TC
SA [2:0] TC