mcf5307cft90b Freescale Semiconductor, Inc, mcf5307cft90b Datasheet - Page 107

• Manufacturer Part Number: mcf5307cft90b
• Description: Mcf5307 Coldfire Integrated Microprocessor User
• Manufacturer: Freescale Semiconductor, Inc

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[CINVA] 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
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