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Digital Control Subsystem
when the RESUME control bit is set to 0. Situation S7 (Figure 27-29) shows that when
pause operation is not used with queue 2, queue 2 suspension works the same way.
IDLE
Q1:
IDLE
Q2:
0000
QS
.
T2
Q2:
C1
C1
IDLE
Q1:
Q2:
IDLE
ACTIVE
QS:
0000
0010
Situations S8 and S9 (Figure 27-30 and Figure 27-31) repeat the same two situations with
the RESUME bit set to a 1. When the RESUME bit is set, following suspension, queue 2
resumes execution with the aborted CCW, not the first CCW, in the queue.
27-44
T1
Q1:
C1
C2
T2
PF1
Q2:
C1
ACTIVE
PAUSE
ACTIVE
1000
0100
Figure 27-28. CCW Priority Situation 6
T1
Q1:
C1
C2
PF1
C1
C2
ACTIVE
PAUSE
ACTIVE
SUSPEND
1010
0110
Figure 27-29. CCW Priority Situation 7
MCF5282 User's Manual
T1
C3
C4
CF1
C2
C1
ACTIVE
ACTIVE
SUSPEND
0110
1010
T1
C3
C4
T2
CF1
C3
PF2
ACTIVE
PAUSE
ACT
SUSPEND
0101
0110
1010
RESUME = 0
C2
C3
C4
CF2
IDLE
ACTIVE
IDLE
0010
0000
C4
C3
CF2
IDLE
ACTIVE
IDLE
0010
0000
MOTOROLA
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