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Section 6 Memory Management Unit (MMU)
Address field
Data field
6.6.4
UTLB Data Array
The UTLB data array is allocated to addresses H'F700 0000 to H'F70F 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, D, SH, and WT to be written to data array
are specified in the data field.
In the address field, bits [31:20] have the value H'F70 indicating UTLB data array and the entry is
specified by bits [13:8].
In the data field, bits [28:10] indicate PPN, bit [8] indicates V, bits [7] and [4] indicate SZ, bits
[6:5] indicate PR, bit [3] indicates C, bit [2] indicates D, bit [1] indicates SH, and bit [0] indicates
WT.
The following two kinds of operation can be used on UTLB data array:
1. UTLB data array read
PPN, V, SZ, PR, C, D, SH, and WT are read into the data field from the UTLB entry
corresponding to the entry set in the address field.
2. UTLB data array write
PPN, V, SZ, PR, C, D, SH, and WT specified in the data field are written to the UTLB entry
corresponding to the entry set in the address field.
Rev. 1.00 Oct. 01, 2007 Page 176 of 1956
REJ09B0256-0100
31
1 1 1 1 0 1 1 0 0 0 0 0
31
VPN:
Virtual page number
V:
Validity bit
E:
Entry
D:
Dirty bit
*:
Don't care
Figure 6.14 Memory-Mapped UTLB Address Array
20
19
14 13
E
* * * * *
*
10 9 8 7
VPN
ASID:
Address space identifier
A:
Association bit
:
Reserved bits (write value should be 0
and read value is undefined )
8 7
2 1
0
A
0 0
* * * * *
0
D
V
ASID
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