ESRC_DAC2
dac = ei->index == EAP_DAC1 ? ESRC_DAC1 : ESRC_DAC2;
eap1371_src_write(sc, ESRC_DAC2+ESRC_TRUNC_N, ESRC_SET_N(16));
eap1371_src_write(sc, ESRC_DAC2+ESRC_IREGS, ESRC_SET_VFI(16));