Reference Timestamp (0xFF,0xD5)
| Description | Internal reference timestamp. | |
| Notes | This timestamp represents the time at which the corresponding data was sampled, according to the internal reference clock. This is a monotonic clock which never jumps. The value is always valid. For events, this is the time of the event trigger. | |
| Parameter Name | Data Type | Description | 
| Field Length | u8 | 10 | 
| Descriptor | u8 | 0xD5 | 
| Nanoseconds | u64 | Nanoseconds since initialization. |