Digi NS9215 User Manual
Page 132
W O R K I N G W I T H T H E C P U
Cache MVA and Set/Way formats
132
Hardware Reference NS9215
ARM926EJ-S
cache format
ARM926EJ-S
cache
associativity
The following points apply to the ARM926EJ-S cache associativity:
The group of tags of the same index defines a set.
The number of tags in a set is the associativity.
The ARM926EJ-S caches are 4-way associative.
The range of tags addressed by the index defines a way.
The number of tags is a way is the number of sets, NSETS.
This table shows values of S and NSETS for an ARM926EJ-S cache.
Set/way/word
format for
ARM926EJ-S
caches
0
1
2
3
4
5
6
7
n
TAG
1
2
31
0
Tag
Index
Word
Byte
S+5
1
S+4
2
4
5
0
3
ARM926EJ-S
S
NSETS
4 KB
5
32
8 KB
6
64
16 KB
7
128
32 KB
8
256
64 KB
9
512
128 KB
10
1024
31
0
Way
31-A
32-A
S+5 S+4
5
4
2 1
SBZ
SBZ
Word
Set select
(= Index)