AN2797 Freescale Semiconductor / Motorola, AN2797 Datasheet - Page 8

• Manufacturer Part Number: AN2797
• Description: Migrating from IBM 750GX to MPC7447A
• Manufacturer: Freescale Semiconductor / Motorola

Feature Overview
2.3
Table 2
2.4
Figure 5
(TLB) and page table search logic is optional although both implementations incorporate them.
8
Cache Description
L1
L2
summarizes the differences if L1 and L2 cache configuration.
L1 and L2 Cache
MMU
shows the standard PowerPC MMU translation method. The presence of translation lookaside buffers
Size, configuration
Memory Coherency
Locking
Replacement policy
Per page/block write configuration
Size, configuration
Memory Coherency
Locking
Replacement policy
Parity
Migrating from IBM 750GX to MPC7447A, Rev. 1.0
Table 2. L1 and L2 Cache Configurations
IBM 750GX
32 Kbyte Instruction, 32 Kbyte Data
8-way set associative
MEI (Data only)
Completely
Pseudo-least-recently used (PLRU) Pseudo-least-recently used (PLRU)
Write-back or write-through (Data)
1MB, 4-way set associative
Two 32 byte blocks/line
MEI
By way
Pseudo-least-recently used (PLRU) 3 bit counter or pseudo random
8 bits/64 bytes on tags
MPC7447A
32 Kbyte Instruction, 32 Kbyte Data
8-way set associative
MESI (Data only)
By way
Write-back or write-through (Data)
512KB, 8-way set associative (7447A)
1MB, 8-way set associative (7448)
Two 32 byte blocks/line
MESI
Completely
8 bits/64 bytes on tags and data
Freescale Semiconductor