MPC8544COMEDEV Freescale Semiconductor, MPC8544COMEDEV Datasheet - Page 193

• Manufacturer Part Number: MPC8544COMEDEV
• Description: KIT DEV EXPRESS MPC8544COM
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8544COMEDEV

• Contents: Board
• For Use With/related Products: MPC8544
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Freescale Semiconductor
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Completion unit
— As many as 14 instructions allowed in 14-entry completion queue (CQ)
— In-order retirement of as many as two instructions per cycle
— Completion and refetch serialization control
— Synchronization for all instruction flow changes—interrupts, mispredicted branches, and
Issue queues
— Two-entry branch instruction issue queue (BIQ)
— Four-entry general instruction issue queue (GIQ)
Branch unit—The branch unit (BU) is an execution unit and is distinct from the BPU. It executes
(resolves) all branch and CR logical instructions.
Two simple units (SU1 and SU2)
— Add and subtract
— Shift and rotate
— Logical operations
— Support for 64-bit SPE instructions in SU1
Multiple-cycle unit (MU)—The MU is shown in
The MU has the following features:
— Four-cycle latency for all multiplication, including SPE integer and fractional multiply
— Variable-latency divide: 4, 11, 19, and 35 cycles for all integer divide instructions. If rA or rB
context-synchronizing instructions
instructions and embedded scalar and vector floating-point multiply instructions
is zero, floating-point divide instructions take 4 cycles; all others take 29. Note that although
most divide instructions take more than 4 cycles to execute, the MU allows subsequent
multiply instructions to execute through all four MU stages in parallel with the divide.
MPC8544E PowerQUICC III Integrated Host Processor Family Reference Manual, Rev. 1
Figure 5-3. Four-Stage MU Pipeline, Showing Divide Bypass
Upper
Reservation
Station
MU-1
MU-2
MU-3
MU-4
Lower
From GIQ0 or GIQ1
Divide Bypass Path
Postdivide
Divide
Figure
5-3.
Core Complex Overview
5-7