mcf5407 Freescale Semiconductor, Inc, mcf5407 Datasheet - Page 53
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mcf5407
Manufacturer Part Number
mcf5407
Description
Mcf5407 Coldfire Integrated Microprocessor User
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MCF5407.pdf
(546 pages)
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ColdFire Module Description
1.3.2.1 16-Kbyte Instruction Cache/8-Kbyte Data Cache
The MCF5407 Harvard architecture includes a 16-Kbyte instruction cache and an 8-Kbyte
data cache. These four-way, set-associative caches provide pipelined, single-cycle access
on cached instructions and operands.
As with all ColdFire caches, the cache controllers implement a non-lockup, streaming
design. The use of processor-local memories decouples performance from external
memory speeds and increases available bandwidth for external devices or the on-chip
4-channel DMA.
Both caches implement line-fill buffers to optimize 16-byte line burst accesses.
Additionally, the data cache supports copyback, write-through, or cache-inhibited modes.
A 4-entry, 32-bit buffer is used for cache line push operations and can be configured for
deferred write buffering in write-through or cache-inhibited modes.
The INTOUCH instruction can be used to prefetch instructions that, when used with the
cache locking feature, cannot be displaced from the instruction cache by instruction cache
misses. This function may be desirable in systems where deterministic real-time
performance is critical.
1.3.2.2 Internal 2-Kbyte SRAMs
Two 2-Kbyte on-chip SRAM modules are also connected to the Harvard memory
architecture and provide pipelined, single-cycle access to memory regions mapped to these
devices. Each memory can be independently mapped to any 0-modulo-2K location in the
4-Gbyte address space and can be configured either for instruction or data accesses.
Time-critical functions can be mapped onto the instruction memory bus, while the system
stack or heavily-referenced data operands can be mapped onto the data bus.
1.3.3 DRAM Controller
The MCF5407 DRAM controller provides a direct interface for up to two blocks of DRAM.
The controller supports 8-, 16-, or 32-bit memory widths and can easily interface to PC-100
DIMMs. A unique addressing scheme allows for increases in system memory size without
rerouting address lines and rewiring boards. The controller operates in normal mode or in
page mode and supports SDRAMs and EDO DRAMs.
1.3.4 DMA Controller
The MCF5407 provides four fully programmable DMA channels for quick data transfer.
Dual- and single-address modes support bursting and cycle steal. Data transfers are 32 bits
long with packing and unpacking supported along with an auto-alignment option for
efficient block transfers. Automatic block transfers from on-chip serial UARTs are also
supported through the DMA channels.
Chapter 1. Overview
1-9
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