Application Note 001: Scanning JTAG Chains In Your Own Designs
Use the following steps whenever you scan a JTAG chain with Universal Scan to get up and running quickly:
1. Connect your download cable to the PC and hardware under test and apply power.
2. Bring up Universal Scan. Add a port, select address and cable type - DON'T add devices yet.
Run the "DEVICE COUNT" Tool in the tools menu. This will run a diagnostic
on your JTAG chain
If it says "There are 3 devices in the chain" (and you really have 3 devices
in the chain) then you are
If it says something like: "There appears to be 3 devices in the chain,
but we only got the result
If it says "There are no devices in the chain" then Universal Scan is unable
to talk to the chain.
The great thing about the Device Count Tool is it requires nothing but
a download cable. No BSDL
Once DEVICE COUNT passes, add your devices to the screen and then run the
VALIDATE BSDL Tool
This tool will compare the BSDL files you selected with the hardware on
the board to make sure
If this says all PASS, then you are ready to start scanning your design.
If this indicates an issue, look at the details tab for clues.
Again, if you get stuck, contact us. techsupport@UniversalScan.com
Once you get past DEVICE COUNT and VALIDATE BSDL, you should be ready to
scan and add Virtual
Check out Application Note 004 for some ideas on implementing JTAG in your design.