mc68ec060 Freescale Semiconductor, Inc, mc68ec060 Datasheet - Page 65

• Manufacturer Part Number: mc68ec060
• Description: Mc68060 Superscalar 68k Microprocessor Including The Lc060 And Ec060
• Manufacturer: Freescale Semiconductor, Inc

SECTION 3
INTEGER UNIT
This section describes the organization of the MC68060 integer unit and presents a brief
description of the associated registers. Refer to Section 4 Memory Management Unit for
details concerning the paged memory management unit (MMU) programming model and to
Section 6 Floating-Point Unit for details concerning the floating-point unit (FPU) program-
ming model.
3.1 INTEGER UNIT EXECUTION PIPELINES
The MC68060 integer unit execution pipelines are four-stage pipelines which perform final
instruction decode, effective address calculation, and execution or integer operations. The
operand execution pipelines (OEPs) are referred to individually as the primary OEP (pOEP)
and the secondary OEP (sOEP). Figure 3-1 shows the integer unit of the MC68060.
MOTOROLA
EXECUTION UNIT
EXECUTE
FETCH
FLOATING-
EA
FP
POINT
UNIT
OC
EX
BRANCH
CACHE
pOEP
DATA AVAILABLE
CALCULATE
EXECUTE
DECODE
WRITE-BACK
FETCH
INT
EA
EA
INSTRUCTION FETCH UNIT
INSTRUCTION
Figure 3-1. MC68060 Integer Unit Pipeline
INTEGER UNIT
BUFFER
OC
DS
AG
EX
sOEP
CALCULATE
EXECUTE
DECODE
INSTRUCTION
FETCH
CALCULATE
INT
DECODE
EA
EA
FETCH
EARLY
IA
M68060 USER’S MANUAL
OPERAND DATA BUS
AG
OC
EX
DS
IB
IAG
IED
IC
WB
DA
INSTRUCTION
INSTRUCTION MEMORY UNIT
ATC
DATA
ATC
DATA MEMORY UNIT
INSTRUCTION
CONTROLLER
CONTROLLER
CACHE
CACHE
DATA
INSTRUCTION
CACHE
CACHE
DATA
B
U
S
C
O
N
R
O
E
R
T
L
L
CONTROL
ADDRESS
DATA
3-1