Pre-Production
WM8850
AFG PS-Act
GPIO2 Output
Logic 1
0
1
2
3
4
Logic 1
Logic 0
Logic 0
Logic 0
Table 33 GPIO2 Automatic Control Mode Summary
Unsolicited Response Priority Control Verb
The Unsolicited Response Priority Control Verb is supported by multiple nodes within the WM8850,
including the Audio Function Group (AFG) node. This verb allows the Unsolicited Responses
associated with each node to be prioritised relative to the other nodes.
The priority level for each node is set using the Priority field within the Unsolicited Response Priority
Control Verb. When more than one Unsolicited Response is awaiting transmission, the node with the
lowest Priority is placed at the front of the queue. Nodes that have the same Priority setting are
queued on a ‘first to trigger’ basis.
Note that the lowest value of Priority represents the highest position in the queue.
The Unsolicited Response Priority Control Verb is defined as follows.
SET VERB
BIT
BITFIELD
NAME
DEFAULT
DESCRIPTION
78Eh
4:0
Priority
00h
Assigns a priority setting for queued
Unsolicited Responses. Nodes with the lowest
value have the highest priority, and so go to
the front of the Unsolicited Response queue.
Nodes with the same value for priority are
queued on first-to-trigger basis.
00h = Highest priority
…
1Fh = Lowest priority.
PP, April 2011, Rev 3.2
75
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
