92HD66B IDT [Integrated Device Technology], 92HD66B Datasheet - Page 20

• Manufacturer Part Number: 92HD66B
• Description: FOUR CHANNEL HD AUDIO CODECS
• Manufacturer: IDT [Integrated Device Technology]

92HD66B
FOUR CHANNEL HD AUDIO CODECS WITH DUAL CAPLESS HEADPHONE AMPLIFIERS
©2011 INTEGRATED DEVICE TECHNOLOGY, INC.
ADC0.CnvrtID.Channel = 0
ADC1.CnvrtID.Channel = 2
ADC0.CnvrtID.Channel = 2
ADC1.CnvrtID.Channel = 0
BITCLK
SDI
still supported this is done by assigning unique non zero Stream IDs to each converter. All capture
devices (ADCs 0 and 1) may be used to create a multi-channel input stream. There are no restric-
tions regarding digital microphones.
The ADC Converters can be associated with a single stream as long the sample rate and the bits per
sample are the same. The assignment of converter to channel is done using the “CnvtrID” widget
and is restricted to even values. The ADC converters will always put out a stereo sample and there-
fore require 2 channels per converter.
The stream will not be generated unless all entries for the targeted converters are set identically, and
the total number of assigned converter channels matches the value in the NmbrChan field. These
are listed the “Multi-Converter Stream Critical Entries.” table.
An example of a 4 Channel Steam with ADC0 supplying channels 0&1 and ADC1 supplying chan-
nels 2 & 3 is shown below. A 4 Channel stream can be created by assigning the same non-zero
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”.
The following figure describes the bus waveform for a 24-bit, 48KHz capture stream with ID set to 1.
0
STREAM ID
0
ADC1 CnvtrID
ADC0 CnvtrID
Stream ID
Stream ID
0
1
STREAM TAG
0
Length
Length
Data
Data
0
DATA LENGTH
Figure 2. Multi-channel timing diagram
1
Table 9. Example channel mapping
Left Channel
Left Channel
Figure 1. Multi-channel capture
1
ADC0
ADC1
0
0
(NID = 0x08)
[3:0]
(NID = 0x07)
[3:0]
ADC0
L23
Right Channel
Right Channel
LEFT
ADC0
ADC1
20
ADC0
L0
ADC0
ADC0
R23
RIGHT
Left Channel
Left Channel
DATA BLOCK
ADC1
ADC0
ADC0
R0
Ch = 2
Ch=0
ADC1
L23
LEFT
Right Channel
Right Channel
ADC1
L0
ADC1
ADC1
ADC0
ADC1
R23
RIGHT
ADC1
R0
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92HD66B