Yes, the OTX driver supports DL-bit access. DL-bit device can be enabled using the following steps:

1. Create OTX_LDEVICE_T1_DL_BIT_ACCESS logical device.
2. Set the DL bit data to be sent using the API function OtxT1SetDlBitData(IN OTX_HANDLE hLogicalDevice, IN OTX_UINT32 nDlBits);

OTX driver reports the following DL bit events; OTX_T1E1_EC_DL_BITS_RECEIVED and OTX_T1E1_EC_DL_BITS_SENT.