Datasheet

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Hardware Overview

The digital audio data input is selectable from USB audio, optical SPDIF, coaxial SPDIF, and analog ADC.

When a digital audio data input is selected, the PPC will automatically send appropriate scripts to the

device in-use.

When direct audio analog input is required, the PPCMB will provide this signal via line-in connector.

• TLV320AIC3262 (mini-DSP) provides programmable algorithms and audio post-processing for many

applications

• PWM modulator with dual ASRC and post-processing capability can be used in mini-component or

AVR systems. The PWM output is connected directly to TI's high-power (300 W) amplifier TAS5624A

EVM.

• I2S audio from the DUT can be captured via USB link or optical SPDIF for signal analysis

1.3 PurePath Console Motherboard Detailed Operations

The following information can be used as a debugging guide.

Upon power-on, the PPCMB uses optical SPDIF input (default). The I2S signals can be seen with an

oscilloscope probe at the pin headers LRCLK, SCLK, SDIN, and MCLK.

EEPROM 1 (EP1) is flashed with firmware that runs the TAS1020B for USB audio (USB-miniEVM), HID,

and USB Composite Device. See the Device Manager, Figure 3.

Figure 3. Device Manager

When the PPCMB is plugged in to a PC, the Device Manager should show all of the USB devices shown

in Figure 3. If one of the devices does not show up, the PPCMB will not work correctly.

When the PPC is executed, the PPC uses the USB audio as the default I2S input. The PCM9211 acts as

the multiplexor that selects among the following I2S signal sources: optical SPDIF, coaxial SPDIF, and

USB audio. The output of the PCM9211 is routed to the TLV320AIC3262. The signal from the

TLV320AIC3262 is then routed to the TAS5548 and the output connector (J1). The TLV320AIC3262 can

be bypassed by switching the MUX3 select control signal to high and the MUX4, MUX5, and MUX6 select

control signals to low by using the PPC; and adding jumpers between pins 1 and 2 of the header LRCLK,

SCLK, SDIN, and MCLK pins.

SLOU366A–June 2013–Revised July 2013

PurePath

Console Motherboard

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