SH7751 Datasheet, PDF (180/1224 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

3. Memory Management Unit (MMU)
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] VPN [31:10] V
Entry 1 ASID [7:0] VPN [31:10] V
Entry 2 ASID [7:0] VPN [31:10] V
Entry 3 ASID [7:0] VPN [31:10] V
PPN [28:10] SZ [1:0] SH C PR SA [2:0] TC
PPN [28:10] SZ [1:0] SH C PR SA [2:0] TC
PPN [28:10] SZ [1:0] SH C PR SA [2:0] TC
PPN [28:10] SZ [1:0] SH C PR SA [2:0] TC
Figure 3.9 ITLB Configuration
3.4.3 Address Translation Method
Figures 3.10 and 3.11 show flowcharts of memory accesses using the UTLB and ITLB.
Rev.4.00 Oct. 10, 2008 Page 82 of 1122
REJ09B0370-0400