mc68ec060 Freescale Semiconductor, Inc, mc68ec060 Datasheet - Page 317

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

10.11 BRANCH INSTRUCTION EXECUTION TIMES
Table 10-17, Table 10-18, and Table 10-19 indicate the number of clock cycles required for
execution of the branch, jump, and return instructions. The number of operand read and
write cycles is shown in parentheses (r/w). Where indicated, the number of clock cycles and
r/w cycles must be added to those required for effective address calculation.
1
MOTOROLA
Remaining JMP
Remaining JSR
Add the effective address calculation time for each entry.
JMP (d16,PC)
JSR (d16,PC)
JMP xxx.WL
JSR xxx.WL
Instruction
Instruction
DBRA
DBcc
FBcc
BRA
BSR
Bcc
Predicted,
Predicted,
Forward,
Forward,
Taken
Taken
7(0/0)
3(0/0)
3(0/1)
3(0/0)
3(0/0)
8(0/0)
3(0/0)
3(0/0)
5(0/0)
3(0/1)
3(0/1)
5(0/1)
Not
Not
Table 10-19. Return Instruction Execution Times
Table 10-18. JMP, JSR Execution Times
Table 10-17. Branch Execution Times
Predicted,
Not Taken
Predicted,
Not Taken
Forward,
Forward,
1(0/0)
2(0/0)
Instruction
8(0/0)
7(0/0)
Not
Not
—
—
—
—
—
—
—
—
RTD
RTE
RTR
RTS
M68060 USER’S MANUAL
Backward,
Backward,
Predicted,
Predicted,
Taken
Taken
3(0/0)
3(0/0)
3(0/1)
3(0/0)
3(0/0)
8(0/0)
3(0/0)
3(0/0)
5(0/0)
3(0/1)
3(0/1)
5(0/1)
Not
Not
Backward,
Backward,
Predicted,
Not Taken
Predicted,
Not Taken
7(0/0)
8(0/0)
7(0/0)
2(0/0)
——
Not
Not
—
—
—
—
—
—
—
Execution Time
17(3/0)
7(1/0)
8(2/0)
7(1/0)
Correctly as
Correctly as
Predicted
Predicted
Taken
Taken
0(0/0)
0(0/0)
1(0/1)
2(0/0)
1(0/0)
2(0/0)
0(0/0)
0(0/0)
5(0/0)
1(0/1)
1(0/1)
5(0/1)
Instruction Execution Timing
1
Correctly as
Correctly as
Not Taken
Not Taken
Predicted
Predicted
1(0/0)
2(0/0)
1(0/0)
2(0/0)
—
—
—
—
—
—
—
—
Incorrectly
Incorrectly
Predicted
Predicted
7(0/0)
8(0/0)
7(0/0)
8(0/0)
—
—
—
—
—
—
—
—
10-21