MC68020 Motorola, MC68020 Datasheet - Page 254
MC68020
Manufacturer Part Number
MC68020
Description
(MC68020 / MC68EC020) MICROPROCESSORS USERS MANUAL
Manufacturer
Motorola
Datasheet
1.MC68020.pdf
(306 pages)
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8.2.18 Save and Restore Operations
The save and restore operations table indicates the number of clock periods needed for
the processor to perform the specified state save or return from exception, with complete
execution times and stack length given. No additional tables are needed to calculate total
effective execution time for these operations. The total number of clock cycles is outside
the parentheses; the number of read, prefetch, and write cycles is given inside the
parentheses as (r/p/w). These cycles are included in the total clock cycle number.
*
8-40
Bus Cycle Fault (Short)
Bus Cycle Fault (Long)
RTE (Normal)
RTE (Six Word)
RTE (Throwaway)
RTE (Coprocessor)
RTE (Short Fault)
RTE (Long Fault)
Add the time for RTE on second stack frame.
*
Operation
M68020 USER’S MANUAL
Best Case
42(1/0/10)
79(1/0/24)
42(10/0/0)
91(24/0/0)
20(4/0/0)
20(4/0/0)
15(4/0/0)
31(7/0/0)
Cache Case
43(1/0/10)
79(1/0/24)
43(10/0/0)
92(24/0/0)
21(4/0/0)
21(4/0/0)
16(4/0/0)
32(7/0/0)
Worst Case
50(1/2/10)
86(1/2/24)
45(10/2/0)
94(24/2/0)
24(4/2/0)
24(4/2/0)
39(4/0/0)
33(7/1/0)
MOTOROLA
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