Application Note 004: JTAG Design considerations
What do you need to scan your own designs with Universal Scan? Just follow the guidelines below and you should be all set!
Obtain a BSDL file for each of the devices in your chain. Most manufacturers
have these readily
2. Make sure your scan chain is set up as follows:
For best results, make sure the JTAG signals (TDI, TDO, TCK, TMS) are buffered
as they enter/leave
If you have more than a few devices in the chain, consider adding more
buffers inline with the JTAG
5. Make sure the power to the pod is appropriate for the pod you are using.
It is a good idea to make sure the JTAG Signals are accessible between
the devices in the chain: if
Make sure the JTAG signals are pulled up and not left floating. (TRST is
an optional signal that should
Note: BSDL Files are notorious for having errors. If you get an error message saying that something is wrong with your BSDL file, e-mail us a copy at techsupport@UniversalScan.com and we’ll attempt to get it fixed up for you.
Check out the parts manufacturers Web Sites for more information on designing with Boundary Scan. They have a ton of information on how to design Scan into your system.