WM8850
Pre-Production
Under default conditions, the WM8850 will pack the S/PDIF Tx Channel Status Data with the correct
values of Sampling Frequency and Sample Word Length automatically, taking into account the
various routing options through the chip. This means the Channel Status Data always reflects the
same rate as the physical S/PDIF stream.
If required, this behaviour can be disabled using the vendor-specific Channel Status Data Packing
Configuration Verb. When CSD_MODE is set to 0, the S/PDIF Tx Channel Status Data is completely
defined using the vendor-specifc Tx Channel Status Control Verb.
SET VERB
BIT
BITFIELD
NAME
DEFAULT
DESCRIPTION
785h
0
CSD_MODE
1
S/PDIF Transmitter Channel Status Data
Packing Mode:
0 = Manual mode: sample rate and data width
channel status data packed from data sourced
from the Tx Channel Status Control Verb
1 = Automatic mode: sample rate and data
width channel status data packed from data
sourced from the Stream Verb, S/PDIF Verb or
S/PDIF Rx Rate Detector (depending on
routing through device)
Note that the vendor-specific S/PDIF Verb supported by the S/PDIF Tx node is described in the
“S/PDIF Transmit using SRC2” section below.
S/PDIF OUT (NID = 0Fh)
Table 30 gives a summary of the S/PDIF Out node:
NODE SUMMARY INFORMATION
NID
0Fh
Widget Type
Pin Complex
Supported Get Verbs
Supported Set Verbs
Unsolicited Responses
Vendor-Specific Verbs
F00h, F02h, F07h, F08h, F09h, F1Ch, F73h, F8Eh
707h, 708h, 71Ch, 71Dh, 71Eh, 71Fh, 773h, 78Eh
Presence Detect
F73h, 773h : Internal Path Verb
F8Eh, 78Eh : Unsolicited Response Priority Control Verb
Table 29 S/PDIF Out Node Summary Information
The S/PDIF Out node controls the physical output to the SPDIFOUT1 pin.
Under default conditions, the S/PDIF Out node will output data from the S/PDIF Tx 1 node. It is also
possible to select S/PDIF In as the data source, using the vendor-specific Internal Path Verb.
SET VERB
BIT
BITFIELD
NAME
DEFAULT
DESCRIPTION
773h
7:0
Path Sel
04h
Selects the source of the S/PDIF Out node:
04h = S/PDIF Tx 1
10h = S/PDIF In
All other values of Path Sel are reserved.
Note: This verb will override the path indicated by the Get Connection List Entry Verb.
PP, April 2011, Rev 3.2
68
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
