SRC_DAC2_BASE
SRCRegWrite(dev, SRC_DAC2_BASE + SRC_TRUNC_N_OFF, 16 << 4);
SRCRegWrite(dev, SRC_DAC2_BASE + SRC_INT_REGS_OFF, 16 << 10);
SRCSetRate(dev, SRC_DAC2_BASE, 48000);
SRCSetRate(dev, SRC_DAC2_BASE, port->speed);