92HD99B Datasheet, PDF (17/225 Pages) Integrated Device Technology – SINGLE CHIP PC AUDIO SYSTEM

92HD99
SINGLE CHIP PC AUDIO SYSTEM, CODEC+SPEAKER AMPLIFIER+CAPLESS HP+LDO
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”.
ADC1 CnvtrID
ADC0 CnvtrID
(NID = 0x08)
[3:0]
(NID = 0x07)
[3:0]
Ch = 2
Ch=0
Table 5. Example channel mapping
Figure 1. Multi-channel capture
ADC0.CnvrtID.Channel = 0
ADC1.CnvrtID.Channel = 2
Stream ID
Data
Length
ADC0.CnvrtID.Channel = 2
ADC1.CnvrtID.Channel = 0
Stream ID
Data
Length
ADC0
Left Channel
ADC1
Left Channel
ADC0
Right Channel
ADC1
Right Channel
ADC1
Left Channel
ADC0
Left Channel
ADC1
Right Channel
ADC0
Right Channel
BITCLK
SDI
The following figure describes the bus waveform for a 24-bit, 48KHz capture stream with ID set to 1.
Figure 2. Multi-channel timing diagram
0
0
0
1
0
0
1
1
0
0
ADC0
L23
ADC0 ADC0
L0
R23
ADC0 ADC1
R0
L23
ADC1 ADC1
L0
R23
ADC1
R0
STREAM ID
DATA LENGTH
STREAM TAG
LEFT
RIGHT
LEFT
RIGHT
ADC0
ADC1
DATA BLOCK
ADC[1:0] Cnvtr
Bit Number
[15]
[14]
Sub Field Name
Description
StrmType
FrmtSmplRate
Stream Type (TYPE):
0: PCM
1: Non-PCM (not supported)
Sample Base Rate
0= 48kHz
1=44.1KHz
Table 6: Mult-channel
IDT CONFIDENTIAL
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92HD99