Analog Devices ADSP-21369 system manual DAI Interface

System Architecture

DAI Interface

The pins of the digital application interface (DAI) connect to the signal routing unit (SRU). The SRU is a flexible routing system, providing a large system of signal flows within the processor. In general, the SRU allows to route the DAI pins to different internal peripherals in various combinations.

The DAI pins connect to the AD1835A audio codec, a 26-pin header, two RCA connectors, the audio oscillator output, an external phase lock loop (PLL) circuit, two LEDs, and two push buttons. Figure 2-2illustrates the EZ-KIT Lite’s connections to the DAI.

DAI20 (SFS45)
	PB_4
DAI19 (SCLK45)	PB_3
DAI18 (SD5B)	SPDIF IN
DAI17 (SD5A)	AUDIO OSC
DAI16 (SD4B)	LED7			DAC_LRCLK	DAC1
DAI15 (SD4A)	LED6			DAC_BCLK	DAC2
DAI14 (SFS23)				DAC_SDATA1	DAC3
DAI13 (SCLK23)				DAC_SDATA2	DAC4
DAI12 (SD3B)				DAC_SDATA3
DAI11 (SD3A)				DAC_SDATA4
DAI10 (SD2B)				AD1835
DAI9 (SD2A)
DAI8 (SFS1)				ADC_LRCLK	ADC
DAI7 (SCLK1)				ADC_BCLK
DAI5 (SD1A)				ADC_SDATA1
DAI6 (SD1B)
DAI4 (SFS0)	ELVIS_TRIG			MCLK
DAI3 (SCLK0)	PLLMCLK IN	DAIP17
DAI2 (SD0B)	PLLMCLK OUT
DAI1 (SD0A)	SPDIF OUT		12.288MHz
DSP

4x2 RCA

Phono

Jack

OUT

Head- phone Jack

1X2 RCA Phono Jack IN

Figure 2-2. DAI Connections Block Diagram

2-4 ADSP-21369 EZ-KIT Lite Evaluation System Manual