Digital audio DAC and SD card on DE10 Lite with Teensy audio shield

Teensy audio shield wired on top of USB Host arduino shield and mounted on DE10 Lite FPGA board. See wiring schematic below. Audio chip SGTL5000 allows to get audio output on headphone plug from FPGA I2S digital format. Line out may be connected by adding header. SD card is also wired.  

USB Host and audio shield on DE10 Lite

USB Host and audio shield on DE10 Lite

Audio shield on top of USB Host shield
(blue female header welded on USB Host PCB)

Audio shield on top of USB Host shield
(show 9/10 pins line in/out header holes)

 

 

Wiring of Audio shield : BEWARE First pad column are Max3421e GPIO outputs, NOTHING must be connected there !

Wiring schematic

SPI MISO, MOSI and SCLK are shared between USB Host max3421e and SD Card. They have separated chip select (CS-SD and CS-USB). Optional flash memory SPI chip select (CS-MEM) is not wired to FPGA board.

SGTL5000 config lines use I2C protocol (SDA/SCL). These lines are wired to FPGA board.

SGTL5000 digital audio I2S interface signals MCLK, LRCLK, BLCK and I2S in (TX) are wired to FPGA board.

SGTL5000 digital audio I2S out (RX) is not connected to FPGA board. Teensy board VOL pin is not wired.