MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 125

• Manufacturer Part Number: MPC555CME
• Description: KIT EVALUATION FOR MPC555
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC555CME

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC555
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: MPC555
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

3.3 Instruction Sequencer
MPC555
USER’S MANUAL
The instruction sequencer provides centralized control over data flow between execu-
tion units and register files. The sequencer implements the basic instruction pipeline,
fetches instructions from the memory system, issues them to available execution
units, and maintains a state history so it can back the machine up in the event of an
exception.
The instruction sequencer fetches instructions from the burst buffer controller into the
instruction pre-fetch queue. The BPU extracts branch instructions from the pre-fetch
queue and uses static branch prediction on unresolved conditional branches to allow
the instruction unit to fetch instructions from a predicted target instruction stream while
a conditional branch is evaluated. The BPU folds out branch instructions for uncondi-
tional branches or conditional branches unaffected by instructions in the execution
stage.
Instructions issued beyond a predicted branch do not complete execution until the
branch is resolved, preserving the programming model of sequential execution. If
branch prediction is incorrect, the instruction unit flushes all predicted path instruc-
tions, and instructions are issued from the correct path.
/
MPC556
CENTRAL PROCESSING UNIT
Rev. 15 October 2000
MOTOROLA
3-3