I might be redundant here, yet I just had to do this - seeing how many people refer to some old/unknown/txt/wherever_found papers or just something that somebody told - regarding MC68000 operation details, instruction timing and even bus access cycle states.
Also when there some bitwidth arguing takes place - just take a peak or two into the manual. The real one!
Here's the most recent and updated paper (2006) from Motorola about the chip, it's timing, instruction set and all the stuff you might wanna know.
www.dtech.lv/sega_dev/MC68000UM.pdf
Most of you are likely to have it, yet it's better if everybody can easily find it (searching the forum) and clear out some things.
MC68000 authoritative reference
MC68000 authoritative reference
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www.dtech.lv
www.dtech.lv