Description
Altera® does not provide a setup time specification for the TDO pin of the USB-Blaster™ download cable, the setup time margin is guaranteed by design. The clock cycle is large in comparison to the setup time of Altera devices.
The TCK cycle frequency is approximately 6MHz or 167ns/cycle.
Note that JTAG changes data on the negative edge of TCK and latches it on the positive edge of TCK.
For example, in Stratix® devices, the TCK to TDO maximum delay is 14ns.