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| 型號： | QADCRM |
| 英文描述： | Queued Analog-to-Digital Converter Reference Manual |
| 中文描述： | 排隊模擬到數(shù)字轉(zhuǎn)換器參考手冊 |
| 文件頁數(shù)： | 70/122頁 |
| 文件大小： | 940K |
| 代理商： | QADCRM |
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MOTOROLA
7-24
DIGITAL CONTROL
QADC
REFERENCE MANUAL
QS[9:6] — Queue Status
The 4-bit read-only QS field indicates the current condition of queue 1 and queue 2.
The following are the five queue status conditions:
Idle
Active
Paused
Suspended
Trigger pending
The two most significant bits are associated primarily with queue 1, and the remaining
two bits are associated with queue 2. Since the priority scheme between the two
queues causes the status to be interlinked, the status bits are considered as one 4-bit
field.
Table 7-6
shows the bits in the QS field and how they affect the status of queue 1 and
queue 2. Refer to
SECTION 9 QUEUE PRIORITY EXAMPLES
, which shows the 4-bit
queue status field transitions in typical situations.
One or both queues may be in the idle state. When a queue is idle, CCWs are not be-
ing executed for that queue, the queue is not in the pause state, and there is not a trig-
ger pending.
The idle state occurs when a queue is disabled, when a queue is in a reserved mode,
or when a queue is in a valid queue operating mode awaiting a trigger event to initiate
queue execution.
A queue is in the active state when a valid queue operating mode is selected, when
the selected trigger event has occurred, or when the QADC is performing a conversion
specified by a CCW from that queue.
Table 7-6 Queue Status
QS[9:6]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Queue 1/Queue 2 States
Queue 1 idle, Queue 2 idle
Queue 1 idle, Queue 2 paused
Queue 1 idle, Queue 2 active
Queue 1 idle, Queue 2 trigger pending
Queue 1 paused, Queue 2 idle
Queue 1 paused, Queue 2 paused
Queue 1 paused, Queue 2 active
Queue 1 paused, Queue 2 trigger pending
Queue 1 active, Queue 2 idle
Queue 1 active, Queue 2 paused
Queue 1 active, Queue 2 suspended
Queue 1 active, Queue 2 trigger pending
Reserved
Reserved
Reserved
Reserved
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
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