JTAG can't connect sometime

[TGao]

Dear Sir/Madam,

Jtag cant't connect sometime , and error hint below：

​Ted.Gao

[YuanLi_S_Intel]

Hi Ted,

There are few possibility that causes this error, can you check the following?

[1] Can you check if you are selecting the correct configuration scheme, device OPN in Quartus design?

[2] Can you change TCK frequency to 6MHz?

Thank You.

Regards,

Bruce.

[TGao]

Hi SooY， 1． The OPN is correct 2． I use usb blaster ，can’t change the frequency. Ted

[YuanLi_S_Intel]

Hi Ted,

Can you please elaborate further so that i can get a full picture on this scenario?

May i know what configuration scheme you are using? Have you tried to program with a SOF file? When you mention about sometimes JTAG cant connect. What does this mean? Please elaborate.

Thank YOu

[TGao]

Hi SooY Solved, Thanks. Ted.Gao

[YuanLi_S_Intel]

Hi Ted,

Oh, i am glad it helps. May i know what did you do to make it work? Perhaps we can help the community in this forum as well.

Thank You.

Regards,

Bruce

[TGao]

Hi SooY, The welding of the plate is not very good. After re welding, the problem is solved. Ted.Gao

[YuanLi_S_Intel]

Hi Ted,

Thanks for your sharing. Hopefully it helps the community here. I am closing this thread. Please rate me good if my support is good.

Thank You.