National Instruments PXI-6683 Series User Manual

Also see for PXI-6683 Series: Installation guide User manual

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several destinations. If the source signal changes within the setup-and-hold window around thesynchronization clock dge, one of the destinations might go to the new logic level while theother destination might remain at the old logic level and change when the next synchronizationclock edge occurs, as shown in Figure 9. on page 23:Figure 9. Synchronous Routing Uncertainty with Setup-and-Hold VariationsSynchronization CLKTrigger Output 2Trigger Ouput 1Trigger Inputt setup t holdt CtoQt CtoQTherefore, if your application requires that the trigger arrive at the multiple destinationssimultaneously, you must ensure that the input is stable within the setup and hold windowaround the synchronization clock edge. For more information and possible methods to ensurethis requirement is met, go to ni.com/info and enter the Info CodeSyncTriggerRouting.Possible sources for synchronous routing with the PXI-6683 Series include the followingsources:• Any front panel PFI pin. (PFI<0..2>)• Any PXI star trigger line (PXI_STAR<0..12>) (PXI-6683 only)• Any PXI trigger line (PXI_TRIG<0..7>)In the PXI-6683 Series, the synchronization clock for synchronous routes is alwaysPXI_CLK10.The destination of a synchronous routing operation on the PXI-6683 Series can be any of thefollowing lines:• Any front panel PFI pin (PFI<0..2>)• Any PXI star trigger line (PXI_STAR<0..12>) (PXI-6683 only)• Any PXI trigger line (PXI_TRIG<0..7>)Note The possible destinations for a synchronous route are identical to those for anasynchronous route.SynchronizationThe PXI-6683 Series is capable of achieving tight synchronization with various other devicesusing GPS, IRIG-B, PPS, IEEE 802.1AS, or IEEE 1588. When GPS or IRIG-B are selected asthe synchronization source, the PXI-6683 Series module can also serve as an IEEE 1588grandmaster. The following sections describe the synchronization capabilities of the PXI-6683Series.PXI-6683(H) User Manual | © National Instruments | 23