mcf5407 Freescale Semiconductor, Inc, mcf5407 Datasheet - Page 68
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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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Features and Enhancements
2.1.1 Clock-Multiplied Microprocessor Core
The MCF5407 incorporates a clock-multiplying phase-locked loop (PLL). Increasing the
internal speed of the core also allows higher performance while providing the system
designer with an easy-to-use lower speed system interface.
The frequency of the processor complex is an integer multiple of the external bus speed.
Chapter 20, “Electrical Specifications,” lists the supported clock ratios.
The processor, instruction and data caches, integrated SRAMs, and misalignment module
operate at the higher speed clock (PCLK); other system integrated modules operate at the
speed of the input clock (CLKIN). When combined with the enhanced pipeline structure of
the Version 4 ColdFire core, the processor and its local memories provide a high level of
performance for today’s demanding embedded applications.
PCLK can be disabled to minimize dissipation when a low-power mode is entered. This is
described in Section 7.2.3, “Reduced-Power Mode.”
2.1.2 Enhanced Pipelines
The IFP prefetches instructions. The OEP decodes instructions, fetches required operands,
then executes the specified function. The two independent, decoupled pipeline structures
maximize performance while minimizing core size. Pipeline stages are shown in Figure 2-1
and are summarized as follows:
2-2
• Vector base register to relocate exception-vector table
• Optimized for high-level language constructs
• Four-stage IFP (plus optional instruction buffer stage)
• Five-stage OEP with two optional processor bus write cycles.
— Instruction address generation (IAG) calculates the next prefetch address.
— Instruction fetch cycle 1 (IC1) initiates prefetch on the processor’s local
— Instruction fetch cycle 2 (IC2) completes prefetch on the processor’s instruction
— Instruction early decode (IED) generates time-critical decode signals needed for
— Instruction buffer (IB) optional stage uses FIFO queue to minimize effects of
— Decode stage (DS/secDS) decodes and selects for two sequential instructions.
— Operand address generation (OAG) generates the address for the data operand.
— Operand fetch cycle 1 and 2 (OC1 and OC2) fetch data operands.
— Execute (EX) performs prescribed operations on previously fetched data
instruction bus.
local bus.
the OEP.
fetch latency.
operands.
MCF5407 User’s Manual
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