MC68EC040FE40A Freescale Semiconductor, MC68EC040FE40A Datasheet - Page 320

• Manufacturer Part Number: MC68EC040FE40A
• Description: IC MPU 32BIT 40MHZ 184-CQFP
• Manufacturer: Freescale Semiconductor

Specifications of MC68EC040FE40A

• Processor Type: M680x0 32-Bit
• Speed: 40MHz
• Voltage: 5V
• Mounting Type: Surface Mount
• Package / Case: 184-CQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

10.7 FLOATING-POINT UNIT INSTRUCTION TIMINGS
For floating-point instructions in the MC68040, the integer pipeline passes the decoded
instruction to the floating-point unit for execution, then supports the floating-point unit by
calculating effective addresses and transferring operands to and from this unit. For these
instructions, the execution times listed in the integer unit timing section show the overhead
required by the integer unit to support the floating-point unit, assuming the floating-point
unit is not busy with the previous floating-point instructions.
Times in parentheses are the total time that that stage uses to execute an instruction even
though the stage can pass data to the next stage early. The order of operands is generally
not significant for timing purposes. Different rounding modes (i.e., round to zero, etc.)
never incur a time penalty. Instructions with an S or D (e.g., FSADD) have the same effect
as setting the rounding precision to S or D. All FMOVEM instructions wait for the pipe to
idle before starting. Refer to Section 9 Floating-Point Unit (MC68040 Only) for details
on the operation of the floating-point unit pipeline.
10.7.1 Miscellaneous Integer Unit Support Timings
MOTOROLA
FBcc
FDBcc
FNOP
FTRAPcc
Instruction
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M68040 USER’S MANUAL
Condition
Not Taken
Not Taken
FPU Idle
cc False
cc True
Taken
<ea> Calculate
11
7
6
9
6
6
Execute
1 L + 7
1 L + 9
1 L + 5
7
6
6
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