WM8580AGEFTV datasheet(71/106 Pages) WOLFSON

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WM8580A

PD, Rev 4.9, November 2013

ERROR HANDLING IN SOFTWARE MODE

When the TRANS_ERR flag is asserted, it indicates that the recovered Rx S/PDIF sub-frame

is corrupted. This corruption can due to a BI-Phase error, a parity error or a pre-amble error.

When the INVALID flag is asserted, it indicates that the recovered Rx S/PDIF sub-frame has

been marked as being invalid by the source of the S/PDIF data. Both TRANS_ERR and

INVALID indicate an error.

The S/PDIF receiver has two modes of handling for these errors, manual and automatic. The

mechanism for each flag is similar. The mechanisms are described below.

MANUAL ERROR HANDLING

This manual handling of errored Rx S/PDIF data can be used when an application processor

is being interrupted via the INT_N signal. Appropriate action should be taken by the

application processor to handle the error condition

If the TRANS_ERR and INVALID error flags are not masked using the MASK register, the

recovered S/PDIF Rx data is passed to the digital audio interface and DAC1 or to the S/PDIF

transmitter irrespective of the state of the flag and the data content of the recovered

stream.(Also refer to note 1 below). In this case, the application processor will be interrupted

via the INT_N signal.

AUTOMATIC ERROR HANDLING

This automatic handling of errored Rx S/PDIF data can be used when an application

processor is not being interrupted via the INT_N signal leaving the WM8580A to handle the

error condition.

If the TRANS_ERR and INVALID error flags are masked using the MASK register, the

WM8580A output data from the S/PDIF Rx interface depends on the setting of FILLMODE. If

FILLMODE=1, then the incoming data (which is errored) is overwritten with 0’s. If

FILLMODE=0, then the last valid data sample is repeatedly output.

For the INVALID flag, the automatic error handling can be disabled if ALWAYSVALID =1. If

ALWAYSVALID is set, then the recovered Rx S/PDIF data, which is marked as invalid, will be

allowed to pass to the digital audio interface or to the S/PDIF transmitter. The data will not be

modified in any way.

Notes

For the S/PDIF receiver to S/PDIF transmitter data path, only the INVALID flag will cause

data to be overwritten, the TRANS_ERR flag is not used to overwrite data which is

passed to the S/PDIF transmitter.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R38

GP01

26h

FILLMODE

Fill Mode Overwrite Configuration

Determines S/PDIF receiver action when TRANS_ERR or

INVALID flag is masked and error condition sets the flag:

0 = Data from S/PDIF receiver is overwritten with last valid

data sample when flag is set.

1 = Data from S/PDIF receiver is overwritten as all zeros

when flag is set.

R39

GP02

27h

ALWAYSVALID

Automatic Error Handling Configuration for INVALID

Flag

0 = INVALID flag automatic error handling enabled.

1 = INVALID flag automatic error handling disabled.

Table 71 S/PDIF Receiver Automatic Error Handling Configuration Registers

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