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Honored ContributorUSB Blaster 2 + MAX10 - TCK / programming issue
Hi,
I've designed a MAX10 10M02SCE144I7G board to be programmed with JTAG. Programming device is Altera USB Blaster II. When I try programming with Quartus Prime, it says: Error (209040): Can't access JTAG chain Error (209012): Operation failed TCK is pulled down with 10k, TMS and TDI are pulled up with 10k I've checked TCK signal with an oszilloscope, showing a broken signal, see attached pictures. To verify, I've tryed connecting directly onto USB blaser: GND and +3V3 (VCC TARGET) pins (1,10 & 4) + TCK pin pulled down with 1kOhm (so no connection to my board), the TCK clock still shows the same weird behaviour. A 2nd. USB Blaster is showing the same pattern. Can somebody please help me identifying the problem? Attachment: TCK signal when pressing "Start" in the Quartus Prime Programmer, zoomed in and complete view.3 Replies
Altera_ForumHi,
the USB-Blaster II download cable has a default TCK frequency of 24 MHz. Can you try to decrease TCK frequency to 6MHz? For more information one can check the following specification, https://www.altera.com/content/dam/altera-www/global/en_us/pdfs/literature/ug/ug_usb_blstr_ii_cable.pdf. Regards, Martin- Altera_Forum
The JTAG signals need to be clean before the Quartus programmer works properly. The EE's I work with say it is important to treat them as a transmission line. See the JTAG spec for details on termination requirements.
- Altera_Forum
I've lowered the clockrate to 6MHz and added some termination, it's working now!
Thanks for your help guys, really appreciate it! Regards
