The FlexRIO Integrated I/O devices have a
Time-to-Digital Converter (TDC) subsystem that allows the device to measure time between
an event asserted in the Sample Clock domain and an event asserted on the PXIe_Clk100
domain. This measurement may be useful for evaluating the relative timing between
synchronous events and is a useful component for multi-board synchronization. A
functional illustration of the TDC is shown below.