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VT1616

6-Channel AC97 Codec with S/PDIF

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VT1616 6-Channel AC97 Codec with S/PDIF

Power Down and Status Register (Index 26h)

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default

EAPD PR6 PR5 PR4 PR3 PR2 PR1 PR0 –

–

–

– REF ANL DAC ADC 0000h

EAPD

PR[6:0]

Enable Amplifier Power Down

“1” : Powerdown External Power Amplifier

“0” : External Power Amplifier active

The signal polarity at pin 47, EAPD is identical to bit description.

Power Down Mode Bits

These read/write bits are used to control the power down states of the VT1616. Each power down

function bit is enabled by setting the respective bit high. Particularly, PR5 has no effect unless PR0,

PR1 and PR4 are all set to “1”. This implies that the codec can be woken up by a warm reset,

because warm reset clears PR4, which in turn disables the function of PR5. The register bit,

however will not be cleared by a warm reset. The power down modes controlled by each bit is

described in the table below:

Bit

Function

PR0

ADC and Mux Powerdown

PR1

DAC Powerdown

PR2

Mixer Powerdown (VREF on)

PR3

Mixer Powerdown (VREF off)

PR4

AC Link Powerdown (BIT_CLK off)

PR5

Internal Clock Disabled

PR6

Alternate Line Out Powerdown

REF,ANL,ADC,DACStatus (READ Only) bits

These bits are used to monitor the readiness of some sections of the VT1616. Reading a “1” from

any of these bits would be an indication of a “ready” state.

Bit

REF

ANL

DAC

ADC

Status Bit

VREF at nominal level

Mixer, Mux and Volume Controls ready

DAC ready to accept data

ADC ready to transmit data

Revision 1.5, October 11, 2002

18

Data Sheet

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