Table 4-3. Victim Index Field Selection - IBM PPC440X5 CPU Core User Manual

User's Manual
PPC440x5 CPU Core
The size of the victim index fields varies according to the size of the respective cache. Also, which field is
used varies according to the type of access, the size of the cache, and the address of the cache line.
Table 4-3 describes the correlation between the victim index fields and different access types, cache sizes,
and addresses.

Table 4-3. Victim Index Field Selection

3
Address 23:26
8KB Cache
0 xxV0[VNDXA] 3:7
1 xxV0[VNDXB] 3:7
2 xxV0[VNDXC] 3:7
3 xxV0[VNDXD] 3:7
4 xxV1[VNDXA] 3:7
5 xxV1[VNDXB] 3:7
6 xxV1[VNDXC] 3:7
7 xxV1[VNDXD] 3:7
8 xxV0[VNDXA] 3:7
9 xxV0[VNDXB] 3:7
10 xxV0[VNDXC] 3:7
11 xxV0[VNDXD] 3:7
12 xxV1[VNDXA] 3:7
13 xxV1[VNDXB] 3:7
14 xxV1[VNDXC] 3:7
15 xxV1[VNDXD] 3:7
Note 1: In the victim index field columns, the "xx" in the SPR name refers
to one of "IN", "IT", "DN", or "DT", depending on whether the
access is to the instruction or data cache, and whether it is a
"normal" or a "transient" access (See Cache Locking and
Transient Mechanism on page 99.)
Note 2: As shown in the table, the 8KB cache size only uses bits 3:7 of
the victim index fields to select a way, since there are only 32
ways. Similarly, the 16KB and 32KB cache sizes uses bits 2:7 of
the victim index fields, since those cache sizes have 64 ways. In
all cases, the unused bits of the victim index fields are reserved.
The size of the fields of the victim limit registers (IVLIM, DVLIM)
are similarly affected by the number of sets in the cache (See
Cache Locking and Transient Mechanism on page 99.)
Note 3: Since the 8KB and 16KB cache sizes only have 8 sets, they only
use Address
24:26
thus they do not use the xxV2 and xxV3 SPRs.
Page 98 of 589
Victim Index Field
16KB Cache
xxV0[VNDXA] 2:7
xxV0[VNDXB] 2:7
xxV0[VNDXC] 2:7
xxV0[VNDXD] 2:7
xxV1[VNDXA] 2:7
xxV1[VNDXB] 2:7
xxV1[VNDXC] 2:7
xxV1[VNDXD] 2:7
xxV0[VNDXA] 2:7
xxV0[VNDXB] 2:7
xxV0[VNDXC] 2:7
xxV0[VNDXD] 2:7
xxV1[VNDXA] 2:7
xxV1[VNDXB] 2:7
xxV1[VNDXC] 2:7
xxV1[VNDXD] 2:7
to select the set and the victim index field, and
1,2
32KB Cache
xxV0[VNDXA] 2:7
xxV0[VNDXB] 2:7
xxV0[VNDXC] 2:7
xxV0[VNDXD] 2:7
xxV1[VNDXA] 2:7
xxV1[VNDXB] 2:7
xxV1[VNDXC] 2:7
xxV1[VNDXD] 2:7
xxV2[VNDXA] 2:7
xxV2[VNDXB] 2:7
xxV2[VNDXC] 2:7
xxV2[VNDXD] 2:7
xxV3[VNDXA] 2:7
xxV3[VNDXB] 2:7
xxV3[VNDXC] 2:7
xxV3[VNDXD] 2:7
Preliminary
cache.fm.
September 12, 2002