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Bus Operation
MOTOROLA
M68060 USER’S MANUAL
7-17
edges has expired. The signal SAS is provided as a status output to indicate which BCLK
rising edge the processor begins to sample the termination signals. If this mode is dis-
Figure 7-14. Line Read Cycle Flowchart
1) SET R/W TO READ
2) DRIVE ADDRESS ON A31–A0
3) DRIVE UP A1–UPA0, TT1–TT0, TM2–TM0,
CIOUT, TLN1–TLN0, LOCK, LOCKE, BS3–BS0
4) DRIVE SIZ1–SIZ0 TO LINE
5) ASSERT TS FOR ONE BCLK
6) ASSERT TIP
7) ASSERT SAS IMMEDIATELY IF
ACKNOWLEDGE TERMINATION IGNORE
STATE CAPABILITY DISABLED. ELSE,
ASSERT SAS AFTER READ PRIMARY
IGNORE STATE COUNTER HAS EXPIRED
1) REGISTER DATA
2) SAMPLE TBI AND TCI
3) INCREMENT A3–A2 IF CLA ASSERTED
1) ASSERT SAS IMMEDIATELY IF
ACKNOWLEDGE TERMINATION
IGNORE STATE CAPABILITY
DISABLED. ELSE, ASSERT SAS
AFTER READ SECONDARY
IGNORE STATE COUNTER HAS
EXPIRED. 1) DECODE ADDRESS
2) PLACE DATA ON D31–D0
3) ASSERT TA FOR ONE BCLK
4) ASSERT CLA TO INCREMENT A3–A2
1) DECODE ADDRESS
2) PLACE DATA ON D31–D0
3) ASSERT TA FOR ONE BCLK
4) ASSERT CLA TO INCREMENT A3–A2
5) ASSERT TBI OR TCI AS NEEDED
PROCESSOR SYSTEM
TBI ASSERTED TBI NEGATED
1) REGISTER DATA
2) INCREMENT A3–A2 IF CLA
ASSERTED
4 LW DONE 4 LW NOT DONE
1) NEGATE LOCK, LOCKE IF
NECESSARY
1) NEGATE TIP OR START NEXT
CYCLE 1) THREE-STATE D31–D0
CONTINUE WITH FIG. 7-16
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