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Altera_Forum
Honored Contributor
Honored Contributorunable to scan device chain. cann't scan jtag chain
Hi,
I am using Nios II Embedded Evaluation Kit (Cyclone III - EP3C25F324C6NES). Though it is having direct programming capability through the Usb cable. I like to test the Programming through the Jtag (J4) . So, I connected the board with the USB Byte Blaster with the Jtag end to the baord and the USB end to the PC. Now , If I open the Programming tool and press the Autodetect Tab then the following message is being popped up .. "Unable to scan device chain. Cann't scan Jtag chain." Could any one help me, how to ovrcome this error .. Thanks , Srinath.17 Replies
Altera_ForumI have your same problem. How did you solve it?
- Altera_Forum--- Quote Start --- Hi, JP1 and JP2 are by default closed on the board... I observed the same error when they were closed... --- Quote End --- Can you take a scope and measure the signal on JP1 ? Do see signal changes in case you try to scan the chain ?
- Altera_Forum
Hi,
JP1 and JP2 are by default closed on the board... I observed the same error when they were closed... - Altera_Forum--- Quote Start --- Hi, JP1 is closed ... on the board ... Should I have to remove it ??? Thanks, Srinath., --- Quote End --- Hi Srinath, JP1 closed should be ok. Is JP2 also closed ? What signal could you observe on JP1, in case you try to scan the chain?
- Altera_Forum
Hi,
JP1 is closed ... on the board ... Should I have to remove it ??? Thanks, Srinath., - Altera_Forum--- Quote Start --- Hi, Thanks a lot for the reply... As you said I did the same thing here on my board... By default there is no Jumper placed ... But even then it was unable to scan the Jtag chain.,... With or Without the Jumper there is no change in the error ... I even measured the voltages from the Byte Balster using multimeter connecting the Balster to the pc on one end and the other to multimeter .... It is showing the exact voltages ... but it could not wok on the board ??? Why does it happen ??? Are there any specific changes that I need to take care on the board ... Thanks, Srinath. --- Quote End --- Hi Srinath, I had a brief look into the schemtics of the board. How is JP1 set ?
- Altera_Forum
Hi,
Thanks a lot for the reply... As you said I did the same thing here on my board... By default there is no Jumper placed ... But even then it was unable to scan the Jtag chain.,... With or Without the Jumper there is no change in the error ... I even measured the voltages from the Byte Balster using multimeter connecting the Balster to the pc on one end and the other to multimeter .... It is showing the exact voltages ... but it could not wok on the board ??? Why does it happen ??? Are there any specific changes that I need to take care on the board ... Thanks, Srinath. - Altera_Forum--- Quote Start --- Hi, I already programmed with the default USB ... There is no issue with the default USB .. But I am trying to work out with the JTAG as well.. So, pelase let me know how to work with the JTAG... Thanks , Srinath. --- Quote End --- Hi Srinth, I found in the manual ( Version June 2008) JP8 Removing the shunt enables configuration of the Cyclone III device using the JTAG header and an external USB-Blaster. When the shunt is in place, the embedded USB-Blaster circuitry must be used to configure the Cyclone III device. (The board ships without the JTAG header populated.)
- Altera_Forum
Hi,
I already programmed with the default USB ... There is no issue with the default USB .. But I am trying to work out with the JTAG as well.. So, pelase let me know how to work with the JTAG... Thanks , Srinath. - Altera_Forum--- Quote Start --- Hi, I have the Cyclone III FPGA Starter Board Reference Manula (Dated : - October 2007) I think this is the new manula available. In that manula it was mentioned to add the Jumper to JP8 to work eith JTAG, Even though I added the Jumper even then the same error continues.... Please see below for the specifoed point from the document ... " JP8 : Adding the shunt enables configuration of the Cyclone III device using the JTAG header and an external USB-Blaster. When the shunt is not in place, the embedded USB-Blaster circuitry must be used to configure the Cyclone III device. (The board ships without the JTAG header populated.) " Now what to do ??? Thanks, Srinath. --- Quote End --- Did you try the embedded USB-Blaster ? In my understanding you have only to connect your PC with the USB port on the board. Is that working ? At least this should work, because this is according to the manual the default board configuration.
