dlfb_set_register_lfsr16
wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds);
wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde);
wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds);
wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde);
wrptr = dlfb_set_register_lfsr16(wrptr, 0x09,
wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1);
wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1);
wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec);
wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0);
wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len);