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Atari coding BBS
| Re: read/write cycles on 68000 |
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Posted by: Kalms
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May,14.2006-01:22
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on 68000:
ADDX.W dn,dm is 4 cycles
ADDX.L dn,dm is 8 cycles
There is no instruction on the 68000 that takes less than 4 cycles to execute, and because the bus interface is set up the way it is on the ST (CPU can do one memory access every 4 cycles), the minimum execution time for a sequeunce of instructions is equivalent to 4x the number of memory accesses (instruction+data) that are required to fulfill the operations.
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