SH7751 Datasheet, PDF (193/1224 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

3. Memory Management Unit (MMU)
31
24 23
Address field _{1 1 1 1 0 0 1 0}
10 9 8 7
0
E
31
Data field
VPN
10 9 8 7
0
V
ASID
Legend:
VPN: Virtual page number
V: Validity bit
E: Entry
ASID: Address space identifier
: Reserved bits (0 write value, undefined read value)
Figure 3.13 Memory-Mapped ITLB Address Array
3.7.2 ITLB Data Array 1
ITLB data array 1 is allocated to addresses H'F300 0000 to H'F37F FFFF in the P4 area. A data
array access requires a 32-bit address field specification (when reading or writing) and a 32-bit
data field specification (when writing). Information for selecting the entry to be accessed is
specified in the address field, and PPN, V, SZ, PR, C, and SH to be written to the data array are
specified in the data field.
In the address field, bits [31:23] have the value H'F30 indicating ITLB data array 1, and the entry
is selected by bits [9:8].
In the data field, PPN is indicated by bits [28:10], V by bit [8], SZ by bits [7] and [4], PR by bit
[6], C by bit [3], and SH by bit [1].
The following two kinds of operation can be used on ITLB data array 1:
1. ITLB data array 1 read
PPN, V, SZ, PR, C, and SH are read into the data field from the ITLB entry corresponding to
the entry set in the address field.
2. ITLB data array 1 write
PPN, V, SZ, PR, C, and SH specified in the data field are written to the ITLB entry
corresponding to the entry set in the address field.
Rev.4.00 Oct. 10, 2008 Page 95 of 1122
REJ09B0370-0400