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Solution ID: rd01302008_207
Last Modified: Jul 29, 2008
Product Category: Devices
Product Area: Configuration
Product Sub-area: Configuration I/O
Problem
What is the setup time specification for the TDO pin of the USB-Blaster?
Solution
Altera® does not provide a setup time specification for the TDO pin of the USB-Blaster™, 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.
Feedback
Altera does not warrant that this solution will work for the customer's intended purpose and disclaims all liability for use of or reliance on the solution.
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