5- 18 M68020 USER’S MANUAL MOTOROLA
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Figure 5-14. Misaligned Word Operand Read from Word Bus Example
Figures 5-15 and 5-16 show an example of a long-word transfer (write) to an odd address
in long-word-organized memory. In this example, a long-word access is attempted
beginning at the least significant byte of a long-word-organized memory. Only one byte
can be transferred in the first bus cycle. The second bus cycle then consists of a three-
byte access to a long-word boundary. Since the memory is long word organized, no
further bus cycles are necessary. Figure 5-17 shows the equivalent operation for a data
read cycle.
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Figure 5-15. Misaligned Long-Word Operand Write
to Long-Word Port Example
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