Rev. 1.50, 10/04, page 148 of 448
7.6.2 ITLB Data Array
The ITLB data array 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 and the entry is
specified by bits [9:8].
In the data field, bits [28:10] indicate PPN, bit [8] indicates V, bits [7] and [4] indicate SZ, bit [6]
indicates PR, bit [3] indicates C, and bit [1] indicates SH.
The following two kinds of operation can be used on ITLB data array:
1. ITLB data array 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 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.
Address field
31 23 0
11110
000011 E
Data field
PPN:
V:
E:
SZ[1:0]:
*
:
24
Physical page number
Validity bit
Entry
Page size bits
Don't care
10 9 8 7 2 1
PR:
C:
SH:
:
Protection key data
Cacheability bit
Share status bit
Reserved bits
(write value should be 0,
and read value is undefined )
31 210
V
10 9 8 730 29 28 4 365
SZ1 SZ0
SHPR
C
PPN
* * * * * * * * * * * * * * * * * *
Figure 7.13 Memory-Mapped ITLB Data Array
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