mcf5307cft90b Freescale Semiconductor, Inc, mcf5307cft90b Datasheet - Page 105
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mcf5307cft90b
Manufacturer Part Number
mcf5307cft90b
Description
Mcf5307 Coldfire Integrated Microprocessor User
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MCF5307CFT90B.pdf
(484 pages)
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The cache supports operation of copyback, write-through, or cache-inhibited modes. The
cache lock feature can be used to guarantee deterministic response for critical code or data
areas.
A nonblocking cache services read hits or write hits from the processor while a fill (caused
by a cache allocation) is in progress. As Figure 4-2 shows, instruction and data accesses
use a single bus connected to the cache.
All addresses from the processor to the cache are physical addresses. A cache hit occurs
when an address matches a cache entry. For a read, the cache supplies data to the processor.
For a write, the processor updates the cache. If an access does not match a cache entry
(misses the cache) or if a write access must be written through to memory, the cache
performs a bus cycle on the internal bus and correspondingly on the external bus by way of
the system integration module (SIM).
The SRAM module does not implement bus snooping; cache coherency with other possible
bus masters must be maintained in software.
4.8 Cache Organization
A four-way set associative cache is organized as four ways (levels). There are 128 sets in
the 8-Kbyte cache with each line containing 16 bytes (4 longwords). Entire cache lines are
loaded from memory by burst-mode accesses that cache 4 longwords of data or
instructions. All 4 longwords must be loaded for the cache line to be valid.
Figure 4-3 shows cache organization as well as terminology used.
Processor
ColdFire
Core
Control
Address
Data
Freescale Semiconductor, Inc.
Figure 4-2. Unified Cache Organization
For More Information On This Product,
Directory Array
Address Path
Control Logic
Chapter 4. Local Memory
Go to: www.freescale.com
Cache
Data Path
Data Array
Address
Control
Data
Integration
System
Module
(SIM)
Cache Organization
Address/
External
Control
Data
Bus
4-7
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