SH7750_08 Datasheet, PDF (170/1162 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

Section 3 Memory Management Unit (MMU)
Note: In single virtual memory mode, entries with the same virtual page number (VPN) but
different ASIDs cannot be set in the TLB simultaneously.
3.4 TLB Functions
3.4.1 Unified TLB (UTLB) Configuration
The unified TLB (UTLB) is so called because of its use for the following two purposes:
1. To translate a virtual address to a physical address in a data access
2. As a table of address translation information to be recorded in the instruction TLB in the event
of an ITLB miss
Information in the address translation table located in external memory is cached into the UTLB.
The address translation table contains virtual page numbers and address space identifiers, and
corresponding physical page numbers and page management information. Figure 3.7 shows the
overall configuration of the UTLB. The UTLB consists of 64 fully-associative type entries. Figure
3.8 shows the relationship between the address format and page size.
Entry 0
Entry 1
Entry 2
ASID [7:0] VPN [31:10] V
ASID [7:0] VPN [31:10] V
ASID [7:0] VPN [31:10] V
PPN [28:10] SZ [1:0] SH C PR [1:0] D WT SA [2:0] TC
PPN [28:10] SZ [1:0] SH C PR [1:0] D WT SA [2:0] TC
PPN [28:10] SZ [1:0] SH C PR [1:0] D WT SA [2:0] TC
Entry 63 ASID [7:0] VPN [31:10] V PPN [28:10] SZ [1:0] SH C PR [1:0] D WT SA [2:0] TC
Figure 3.7 UTLB Configuration
Rev.7.00 Oct. 10, 2008 Page 86 of 1074
REJ09B0366-0700