Application Note Number
AN-TC
Revision History
| Date
|
Author
|
Details
|
| 2020-02-10
|
Sam Reiter
|
Initial creation
|
Abstract
This AN discusses Timed Commands in UHD. We will explore usecases, theory of operation, and examples of timed command use in UHD 3.x.
Timed Commands: Overview and Usecases
Clocking and Timekeeping in the USRP
CHDR Packet Types and Structure
VITA Time
PPS (Pulse Per Second)
Radio Core Block Timing
General RFNoC block Timing
Command Queue
Summary
USRP Time Sources
Internal PPS
External PPS
GPSDO
UHD API for Timed Commands
Overview of Relevant Methods
Timed Commands vs. Stream Commands with time_spec (remove this?)
Commands that can be timed
Time Resolution of Timed Commands
Example: Using Timed Commands to Phase Align Channels
Example: Using Timed Commands to Control GPIO
