HEVCD_MPP_ANC_CANVAS_DATA_ADDR
amvdec_write_dos(core, HEVCD_MPP_ANC_CANVAS_DATA_ADDR, 0);
amvdec_write_dos(core, HEVCD_MPP_ANC_CANVAS_DATA_ADDR, 0);
amvdec_write_dos(core, HEVCD_MPP_ANC_CANVAS_DATA_ADDR,
val = amvdec_read_dos(core, HEVCD_MPP_ANC_CANVAS_DATA_ADDR) & 0xffff;
val = amvdec_read_dos(core, HEVCD_MPP_ANC_CANVAS_DATA_ADDR) & 0xffff;