Honored Contributor
Honored ContributorYou figured it out but, but to add a little more, the "data can chane only in a window" comes from you, wich presumable comes from another device's datasheet. So you may be driving data to a device who's datasheet says, "The transmitter must send clock and data edge-aligned, wheter the data can change anywhere up to 1ns later than the clock to 2ns before". Or maybe it's a device that said it has a Tsu of 2ns and Th of 1ns. The way the waveform is drawn, it would be the same thing. (Of course no datasheets are ever that direct)
That's one of the things that often gets lost, and I think the TI examples are very nice in that they list two transmitters, and yet the way to constrain them is very different.