WM8850GEFLSLASHV datasheet(57/223 Pages) WOLFSON

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Pre-Production

WM8850

PP, April 2011, Rev 3.2

S/PDIF RECEIVE

S/PDIF Receive functionality is supported using the SPDIFIN pin; this provides an IEC-60958-3

compatible S/PDIF input through the S/PDIF Rx node.

The S/PDIF receiver accepts all common audio sample frequencies from 32kHz to 96kHz, and an on-

chip fully-asynchronous sample rate coverter (SRC) provides the flexibility to interface any supported

incoming S/PDIF rate to the HDA interface without loss of quality. The S/PDIF receiver supports

readback of all 40-bits of the S/PDIF channel status information, but does not decode the user

channel data.

The WM8850 nodes associated with this function are shown in Figure 13:

Figure 13 S/PDIF Receive Path

This section provides a summary of the S/PDIF In and S/PDIF Rx nodes, and describes the vendor-

specific verb functions associated with each.

S/PDIF IN (NID = 10h)

Table 26 gives a summary of the S/PDIF In node:

NODE SUMMARY INFORMATION

NID

10h

Widget Type

Pin Complex

Supported Get Verbs

F00h, F07h, F08h, F09h, F1Ch, F8Eh, FA0h, FA1h

Supported Set Verbs

707h, 708h, 71Ch, 71Dh, 71Eh, 71Fh, 78Eh, 7A1h

Unsolicited Responses

Presence Detect

Lock Status

Recovered Rate Change

Vendor-Specific Verbs

F8Eh, 78Eh : Unsolicited Response Priority Control Verb

FA0h : Get S/PDIF In Status Verb

FA1h, 7Ah : S/PDIF In Control Verb

Table 26 S/PDIF In Node Summary Information

The S/PDIF In node provides control over the physical connection of the input to the S/PDIF receiver.

The node also provides basic status information from the S/PDIF receiver circuitry, such as lock

status and recovered sample rate.

The S/PDIF input circuitry accepts signal levels as described in IEC-60958-3, as well as CMOS

compatible and low-amplitude CMOS compatible signals. This allows for a wide range of external

connectivity to the WM8850 depending on the application, which may range from direct connection of

electrical signals from a coaxial cable through a matching network or from another CMOS device like

an optical receiver or DSP.

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