USB AUDIO 2.0 REFERENCE DESIGN XMOS, USB AUDIO 2.0 REFERENCE DESIGN Datasheet - Page 41

• Manufacturer Part Number: USB AUDIO 2.0 REFERENCE DESIGN
• Description: USB AUDIO 2.0 REFERENCE DESIGN
• Manufacturer: XMOS

Specifications of USB AUDIO 2.0 REFERENCE DESIGN

• Design Resources: USB AUDIO Schematic
• Main Purpose: Audio, Audio Processing
• Embedded: Yes
• Utilized Ic / Part: XS1-L1
• Primary Attributes: Audio data up to 24-bit @ 192kHz
• Secondary Attributes: I²S and S/PDIF
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 880-1017

USB Audio Software Design Guide
Since the clocks come from fixed oscillators on this board, the clock configuration
functions do not need to do anything. This will be different if the clocks came from
void CodecConfig(unsigned samFreq, unsigned mClk, chanend ?c_codec)
{
}
timer t;
unsigned time;
unsigned portVal;
unsigned tmp;
/* Put codec in reset and set master clock select appropriately */
if ((samFreq % 22050) == 0)
{
}
else if((samFreq % 24000) == 0)
{
}
else
{
}
tmp = port32A_peek();
tmp &= (P32A_LED_A | P32A_LED_B);
port32A_out(portVal | tmp);
/* Hold in reset for 2ms */
t :> time;
time += 200000;
t when timerafter(time) :> int _;
/* Codec out of reset */
portVal |= P32A_COD_RST;
tmp = port32A_peek();
tmp &= (P32A_LED_A | P32A_LED_B);
port32A_out(portVal | tmp);
portVal = P32A_USB_RST;
portVal = (P32A_USB_RST | P32A_CLK_SEL);
if (samFreq == 1234)
printintln(samFreq);
printstr("Unrecognised sample freq in ConfigCodec\n");
assert(0);
return;
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