Forum Discussion
New ContributorHard reset with USB-Blaster and Quartus
Hello there,
I am working on few JTAG operations using Quartus prime standard (v24) with USB-Blaster (cable).
After every operation I need to hard reset to perform the next operation. Unless Hard-reset is performed, the data received in TDO is not correct.
Is there any command to make sure we do not have to perform hard-reset (Just to note, soft-reset is always performed).
A quick response to this would be appreciated. Thanks in advance :)
BR,
Alkesh
7 Replies
Alkesh_shahMore details added with another discussion "Hard Reset Required After Each Boundary Scan Operation".
FakhrulA_alteraRegular Contributor
Hi Alkesh,
Hard reset is not required by design. The issue is the chain being left in a test state. After each scan, send a TAP reset (TMS high for 5 TCK), load BYPASS for all devices, return to Run‑Test/Idle, and do a short DR flush. If your device is Stratix 10, run the MISCCTRL enable once before boundary‑scan. Quartus Programmer is not a full boundary‑scan tester, so you must manage these states yourself or use a dedicated BST tool.
Reference: Intel MAX 10 JTAG Boundary‑Scan Testing User Guide : explains enabling/disabling BST, using BYPASS/SAMPLE, and parking in Run‑Test/Idle to avoid ending in EXTEST or HIGHZ.
https://cdrdv2-public.intel.com/667087/ug_m10_jtag-683210-667087.pdf- Alkesh_shah
I am executing it using the tcl script. Can you help me with the tcl command to do so.
I am on Quartus Prime Standard version24.01. Attached are the commands available. A quich help on which one to use would be really helpful.
- Alkesh_shah
Hello There,
Can you please help me with this issue?
By any chance can I have the access to USB_Blaster drivers to control the TMS pin? Is there any command that I can use. I see even with Quartus Prime Standard version (GUI application), I am not able to reset the TAP-State.
Awaiting the response from your end.
BR,
Alkesh- FakhrulA_altera
Hi Alkesh,
A hard reset shouldn’t be required. This usually happens because the JTAG TAP or a device is left in a test state. Between scans, reset the TAP, park all devices in BYPASS, return to Run‑Test/Idle, and do a short DR flush. Avoid ending in EXTEST or HIGHZ. If your device is Stratix 10, enable boundary‑scan once via the MISCCTRL instruction. Quartus Programmer isn’t a full boundary‑scan tester, so you need to manage these states or use a dedicated BST tool.
Reference: Intel MAX 10 JTAG Boundary‑Scan Testing User Guide
Intel® MAX® 10 JTAG Boundary-Scan Testing User Guide
What device you are using btw?
Regards,
Fakhrul - FakhrulA_altera
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