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Altera_Forum
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10 years ago

USB blaster II pin 6 and 8 & HPS TRST, nRST pins

Hi, I need some advice on the USB blaster II pin 6,8 and the hps reset signals. We found that the ds5 debugger via USB blaster II does not connect everytime, and also after the hps loaded preloa...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
10 years ago

Hi Thank you for the reply.

I can comment the following, to maybe help other people.

Pin 6 of the USB Blaster II must be connected to HPS_nRST. (VCC IO Bank & JTAG in my case is both 3V3). If you do not connect this blaster reset to the HPS nRST, the DS5 will not always connect & when inspecting global variables it will take fore-ever to update the DS5 screen with global variables after each step of stepping the code with F6. I changed my board to connect pin 6 to HPS_nRST, and now DS5 is working like a dream (connection and Global variable inspection)

I tested XJTAG successfully with my board, without have pin 8 of the USB Blaster connected to HPS_nRST. So this does not seem to be i definite requirement for XJTAG, however in future boards i will make provision to connect pin 8 to HPS_nRST via not fitted 0R resitor.

Thanks