WM8580 datasheet(62/92 Pages) WOLFSON

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WM8580

Production Data

PD Rev 4.0 February 2007

INTERRUPT GENERATION (INTB)

The hardware interrupot INTB flag (active low) indicates that an event has occurred on UNLOCK,

INVALID, TRANS_ERR, NON_AUDIO, CPY_N, DEEMPH, CSUD or REC_FREQ. To determine

which flag caused the interrupt, the Interrupt Status Register should be read when INTB is asserted.

INVALID, TRANS_ERR and CSUD generate an interrupt when the flag transitions from low to high.

UNLOCK, NON_AUDIO, CPY_N, DEEMPH and REC_FREQ will generate an interrupt on any

change in status. INTB will remain asserted until it is cleared by reading the interrupt status register.

If INVALID, TRANS_ERR or CSUD are still active when the interrupt status register is read, INTB

remains asserted.

Table 61 Interrupt Status Register

Where the INTB has been asserted by an update signal (UPD_UNLOCK, UPD_NON_AUDIO,

UPD_CPY_N, UPD_DEEMPH, UPD_REC_FREQ) the S/PDIF Status Register can be read to reveal

the satus of the flag. See Table 62.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

UPD_UNLOCK

UNLOCK flag update signal

0 = INTB not caused by update to UNLOCK flag

1 = INTB caused by update to UNLOCK flag

INT_INVALID

INVALID flag interrupt signal

0 = INTB not caused by INVALID flag

1 = INTB caused by INVALID flag

INT_CSUD

CSUD flag interrupt signal

0 = INTB not caused by CSUD flag

1 = INTB caused by CSUD flag

INT_TRANS

_ERR

TRANS_ERR flag interrupt signal

0 = INTB not caused by TRANS_ERR flag

1 = INTB caused by TRANS_ERR flag

UPD_NON_AUDIO

NON_AUDIO update signal

0 = INTB not caused by update to NON_AUDIO flag

1 = INTB caused by update to NON_AUDIO flag

UPD_CPY_N

CPY_N update signal

0 = INTB not caused by update to CPY_N flag

1 = INTB caused by update to CPY_N flag

UPD_DEEMPH

DEEMPH update signal

0 = INTB not caused by update to DEEMPH flag

1 = INTB caused by update to DEEMPH flag

R43

INTSTAT

2Bh

(read-only)

UPD_REC_FREQ

REC_FREQ update signal

0 = INTB not caused by update to REC_FREQ flag

1 = INTB caused by update to REC_FREQ flag

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