MC68LC060RC66 Freescale Semiconductor, MC68LC060RC66 Datasheet - Page 120

• Manufacturer Part Number: MC68LC060RC66
• Description: IC MPU 32BIT 66MHZ 206-PGA
• Manufacturer: Freescale Semiconductor

Specifications of MC68LC060RC66

• Processor Type: M680x0 32-Bit
• Speed: 66MHz
• Voltage: 3.3V
• Mounting Type: Surface Mount
• Package / Case: 206-PGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

Floating-Point Unit
The MC68060 FPU has been optimized for the most frequently used instructions and data
types. The MC68060 fully conforms to the ANSI/IEEE 754–1985 Standard for Binary Float-
ing-Point Arithmetic . In addition, the MC68060 processor maintains compatibility with the
Motorola extended-precision architecture and is user object code compatible with the
MC68881/MC68882 floating-point coprocessors and the MC68040 microprocessor FPU.
With the inclusion of the M68060SP, the MC68060 provides MC68881/MC68882-compati-
ble software functions. Details on the M68060SP are provided in Appendix C MC68060
Software Package .
6.1 FLOATING-POINT USER PROGRAMMING MODEL
Figure 6-2 illustrates the floating-point portion of the user programming model. The following
paragraphs describe the FPU portion of the user programming model for the MC68060. The
model, which is identical to the programming model for the MC68881/MC68882 floating-
point coprocessors, consists of the following registers:
6-2
EXECUTION UNIT
• Eight 80-Bit Floating-Point Data Registers (FP7–FP0)
• 16-Bit Floating-Point Control Register (FPCR)
• 32-Bit Floating-Point Status Register (FPSR)
• 32-Bit Floating-Point Instruction Address Register (FPIAR)
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
Figure 6-1. Floating-Point Unit Block Diagram
INSTRUCTION
INTEGER UNIT
BUFFER
AG
OC
EX
DS
sOEP
CALCULATE
EXECUTE
DECODE
INSTRUCTION
FETCH
CALCULATE
DECODE
EA
INT
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
O
O
MOTOROLA
B
U
S
C
N
T
R
L
L
E
R
CONTROL
ADDRESS
DATA