mcf5307cft90b Freescale Semiconductor, Inc, mcf5307cft90b Datasheet - Page 62
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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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Features and Enhancements
2.1.1 Clock-Multiplied Microprocessor Core
The MCF5307 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 can be 2x, 3x, or 4x the external bus speed.
The processor, cache, integrated SRAM, and misalignment module operate at the higher
speed clock (PCLK); other system integrated modules operate at the speed of the bus clock
(BCLKO). When combined with the enhanced pipeline structure of the Version 3 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:
2-22
• Four-stage IFP (plus optional instruction buffer stage)
• Two-stage OEP
— 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, select/operand fetch (DSOC) decodes the instruction and selects the
— Address generation/execute (AGEX) Calculates the oeprand address, or
instruction bus.
local bus.
the OEP.
fetch latency.
required components for the effective address calculation, or the operand fetch
cycle.
performs the execution of the instruction.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
MCF5307 User’s Manual
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