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Bus Operation
7-22 M68060 USER’S MANUAL MOTOROLA
Figure 7-18. Byte, Word, and Long-Word Write Transfer Flowchart
1) SET R/W TO WRITE
2) DRIVE ADDRESS ON A31–A0
3) DRIVE UPA1–UPA0, TT1–TT0, TM2–TM0,
CIOUT, TLN1–TLN0, LOCK, LOCKE, BS3–BS0
4) DRIVE SIZ1–SIZ0 TO BYTE, WORD, OR LONG
5) ASSERT TS FOR ONE BCLK
6) ASSERT TIP
7) ASSERT SAS IMMEDIATELY IF
ACKNOWLEDGE TERMINATION IGNORE
STATE CAPABILITY DISABLED. ELSE,
ASSERT SAS AFTER WRITE PRIMARY
IGNORE STATE COUNTER HAS EXPIRED
8) DRIVE D31–D0 WITH APPROPRIATE DATA
1) THREE-STATE DATA BUS
2) NEGATE LOCK, LOCKE IF NECESSARY
1) NEGATE TIP OR START NEXT CYCLE
1) DECODE ADDRESS
2) LATCH DATA FROM APPROPRIATE BYTE
LANES BASED ON SIZ1–SIZ0, A1–A0, OR
BS3–BS0
3) ASSERT TA FOR ONE BCLK
PROCESSOR SYSTEM
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