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3.4.2
Instruction TLB (ITLB) Configuration
The ITLB is used to translate a virtual address to a physical address in an instruction access.
Information in the address translation table located in the UTLB is cached into the ITLB. Figure
3.9 shows the overall configuration of the ITLB. The ITLB consists of 4 fully-associative type
entries. The address translation information is almost the same as that in the UTLB, but with the
following differences:
1. D and WT bits are not supported.
2. There is only one PR bit, corresponding to the upper of the PR bits in the UTLB.
Entry 0
ASID [7:0]
Entry 1
ASID [7:0]
Entry 2
ASID [7:0]
Entry 3
ASID [7:0]
3.4.3
Address Translation Method
Figures 3.10 and 3.11 show flowcharts of memory accesses using the UTLB and ITLB.
Rev. 2.0, 03/99, page 42 of 396
VPN [31:10]
V
PPN [28:10]
VPN [31:10]
V
PPN [28:10]
VPN [31:10]
V
PPN [28:10]
VPN [31:10]
V
PPN [28:10]
Figure 3.9 ITLB Configuration
SZ [1:0]
SH
C
PR
SA [2:0]
SZ [1:0]
SH
C
PR
SA [2:0]
SZ [1:0]
SH
C
PR
SA [2:0]
SZ [1:0]
SH
C
PR
SA [2:0]
TC
TC
TC
TC
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