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92HD71B7

4-CHANNEL HD AUDIO CODEC OPTIMIZED FOR LOW POWER

Integrated Device Technology 

92HD71B7

4-CHANNEL HD AUDIO CODEC OPTIMIZED FOR LOW POWER

PC AUDIO

stream id “Strm= N” to both ADC0 and ADC1. The sample rates must be set the same and the num-

ber of channels must be set to 4 channels “NmbrChan = 0011”.

ADC1 CnvtrID

ADC0 CnvtrID

Table 6: Example channel mapping

(NID = 0x08)

[3:0]

(NID = 0x07)

[3:0]

Ch = 2

Ch=0

ADC0.CnvrtID.Channel = 0

ADC1.CnvrtID.Channel = 2

ADC0.CnvrtID.Channel = 2

ADC1.CnvrtID.Channel = 0

Stream ID

Stream ID

Figure 3. Multi-channel capture

Data

Length

ADC0

Left Channel

ADC0

Right Channel

Data

Length

ADC1

Left Channel

ADC1

Right Channel

ADC1

Left Channel

ADC0

Left Channel

ADC1

Right Channel

Null PAD

ADC0

Right Channel

Null PAD

BITCLK

The following figure describes the bus waveform for a 24-bit, 48KHz capture stream with ID set to 1.

Figure 4. Multi-channel timing diagram

SDI

0

0

0

1

0

0

1

1

0

0

ADC0

L23

ADC0 ADC0

L0

R23

ADC0 ADC1

R0

L23

ADC1

L0

ADC1

R23

ADC1

R0

STREAM ID

DATA LENGTH

STREAM TAG

LEFT

RIGHT

LEFT

RIGHT

ADC0

ADC1

DATA BLOCK

1.4.12.

EAPD

The EAPD pin (pin 47) also supports SPDIF and GPIO functions. The pin defaults to EAPD after

power on reset and will remain in EAPD mode until either GPIO is enabled for pin 47 or the port I/O

is enabled to support SPDIF. The EAPD value is reflected on the EAPD pin; a 1 causes the external

amplifier to power up, and a 0 causes it to power down. When the EAPD value = 1, the EAPD pin

must be placed in a state appropriate to the current power state of the associated Pin Widget even

though the EAPD value may remain 1. The default state of this pin is 0 (driving low) and a Pull-down

prevents the line from floating high when the part is in reset.

IDT™ CONFIDENTIAL AND PROPRIETARY

17

4-CHANNEL HD AUDIO CODEC OPTIMIZED FOR LOW POWER

92HD71B7

V 0.9 07/07

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