D2-7XX83 Datasheet, PDF (18/32 Pages) Intersil Corporation – Powered Speaker Systems

D2-7xx83
Audio Processing Signal Flow Support
The D2-7xx83-series of ICs supports a wide variety of signal flows
and audio processing options that are fully programmable and
are completely defined by the system firmware and system
architecture.
The firmware provided for the D2-7xx83 devices is
application-specific and includes its own specific signal flow and
associated performance level. Much of the signal flow is also
hardware dependent and that hardware integrates with the full
system architecture that is defined within that system’s
programmed firmware. Each firmware design includes a specific
set of control tool support, including the D2Audio™ Audio
Canvas™ software and system design data.
Additional design-specific reference documentation is included
within each firmware application design, that includes
platform-specific signal flows, control registers, and descriptions
of advanced processing features.
The various system support capabilities include:
• Flexible system configuration with 8 audio input and audio
processing channels, with up to 12 audio output PWM
channels, supporting differential or single-end PWM outputs
with up to 18 PWM output pins.
• Audio processing for up to 4 simultaneous stereo
asynchronous digital audio inputs from a variety of sources
(HDA, I²S, HDMI, DSD, S/PDIF Digital)
• Multiple D2-7xx83 devices may be cascaded to support higher
channel count designs.
Functional Description
The D2-7xx83 Family of ICs, integrated into D2Audio’s offerings
of reference design platforms support present and future design
features with little or no additional hardware or logic to enable
new features.
Audio Input
Multiple versions of the D2-7xx83 family IC-based reference
designs support a wide range of market applications and each of
these market applications has a variety of potential audio
sources such as:
• Mono and Stereo Analog Inputs
• Serial Audio, I²S and Time Division Multiplexed (TDM) Single
Line “Network” Mode
• HD-Audio Interface (UAA-Class Driver Capable)
• Stereo and Multichannel DSD
• S/PDIF Digital (IEC60958-Compliant and IEC61937-
Compliant)
SERIAL AUDIO INPUT
Since most systems incorporate some mix of digital and analog
inputs, the DAE-6 offers a very flexible digital audio peripheral
interface. The DAE-6 features four independent Serial Audio
Interface (SAI) ports. All SAI ports support both master or slave
clocking and can support sample rates from 32kHz to 192kHz.
Each SAI port supports the digital audio industry I²S standard, which
supports carrying up to 24-bit Linear PCM audio words per subframe
IEC60958, or compressed digital audio (Dolby^® Digital, AAC, DTS^®,
MPEG, etc.) packing per the IEC61937 specification. The SAI port
also supports Left-Justified formatted Linear PCM or compressed
digital audio. Each SAI port supports time division multiplexing
(TDM) capability (a.k.a. “Network mode”) with up to 32 words per
frame.
SAI ports 2 and 3 (the 3rd and 4th ports) have multiplexed inputs
to provide a standard input signal flow for the ADC, DSD, and
HDA audio interfaces. All serial audio input data streams go
through an SAI interface, which simplifies the data flow
configuration.
SAI data formats are shown in Figure 5. For I²S format, the left
channel data is read when LRCK is low. For the Left-Justified
format, the left channel data is read when LRCK is high. Either
format requires data to be valid on the rising edge of SCLK and
sent MSB-first on SDIN with 32 bits of data per channel. Each set
of digital inputs runs asynchronously to the others and may
accept different sample rates and formats.
LRCLKx
Left Channel
Right Channel
SCLKx
Serial
Data
MSB
-1
-2
-3
+3 +2 +1 LSB
MSB -1
-2
-3
+3 +2 +1 LSB
MSB
I²S Format
LRCLKx
SCLKx
Serial
Data
Left Channel
Right Channel
MSB -1
-2
-3
-4
+3 +2 +1 LSB
MSB -1
-2
-3
-4
Left-Justified
+3 +2 +1 LSB
FIGURE 5. SAI PORT SUPPORTED DATA FORMATS FOR DELIVERY OF LINEAR PCM OR COMPRESSED AUDIO DATA
MSB -1
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FN7838.3
April 28, 2016