mcf5407 Freescale Semiconductor, Inc, mcf5407 Datasheet - Page 133

• Manufacturer Part Number: mcf5407
• Description: Mcf5407 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

Cache Organization
4.8.2 The Cache at Start-Up
As Figure 4-4 (A) shows, after power-up, cache contents are undefined; V and M may be
set on some lines even though the cache may not contain the appropriate data for start up.
Because reset and power-up do not invalidate cache lines automatically, the cache should
be cleared explicitly by setting CACR[DCINVA,ICINVA] before the cache is enabled (B).
After the entire cache is flushed, cacheable entries are loaded first in way 0. If way 0 is
occupied, the cacheable entry is loaded into the same set in way 1, as shown in Figure 4-4
(D). This process is described in detail in Section 4.9, “Cache Operation.”
Chapter 4. Local Memory
4-9