CXADEC_HOST_REG1
v = cx18_av_read4(cx, CXADEC_HOST_REG1);
cx18_av_write4_expect(cx, CXADEC_HOST_REG1, v | 1, v, 0xfffe);
cx18_av_write4_expect(cx, CXADEC_HOST_REG1, v & 0xfffe,