ALTERA TERASIC USB BLASTER DRIVER

There are 3 major sections: This is the first transaction that travels over the JTAG cable when you issue the "nios2-terminal" command. What remains is the question about why the cheap clone doesn't work. A really interesting difference is in the spacing between fast clock groups: The Terasic doesn't have that problem:

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All processing is done with a simply state machine.

And at the end you have a suffix with 2 slow clock cycles. And here's the equivalent of the cheap clone. A fast clock group sets the clock at 12MHz instead of 6MHz.

A really interesting difference is in the spacing between fast clock terasid Yes, delete it Cancel. The suffix is really different, with 6 clock clocks but also a fast clock group in between. As I wrote earlierthe biggest issue with the cheap clone is that it doesn't work terasiic my eeColor Color3 board.

While the Terasic was rock solid in its communication with the Color3 board. Zooming in on the slow clocks, we see a clock frequency of kHz.

USB Blaster Cable

In addition, there are roughly 3 idle cycles between a fast clock group. But the cheap clone runs TCK at exactly double the speed of the Terasic, and both devices only use a flimsy, cheap flat cable. In the middle we have the expected 16 fast clock groups.

We see a similar pattern, but interestingly enough, it's not the same. I was supposed to work on getting the SiI terawic and runningbut UPS delivered a nice package today: The set of signals below that is a slightly zoomed in version of the one above.

It may be that 12MHz is really just pushing things too much.

Terasic vs Cheap Clone USB Blaster | Details |

In the middle there are 16 groups with fast clock cycles each group is itself 8 clock cycles. The Terasic doesn't have that problem: My money is on the clock speed: What remains is the question about why the cheap clone doesn't work.

This is the first transaction that travels over the JTAG cable when you issue the "nios2-terminal" command. Sign up Already a member?

There are 3 major sections: The most important signal here is TCK, in yellow. Meanwhile, during a fast clock group, the clock toggles at 6MHz.

For this investigation, it doesn't matter what gets transported when, but it's almost certain that the slow clock cycles are used to move the Terasiv TAP from iDLE state to the scan DR or scan IR state, and that the fast clock groups are used to rapidly scan data in and out of a scan data register. It's not that it's broken: If we ignore for a second that the cheap clone doesn't work on this particular board, the biggest consequence of the chapeau clone is that bulk transfers are much slower: The cheap clone was never able to get reliable contact.

When you zoom in on the slow clock cycles, you can measure a TCK frequency of kHz: For the cheap clone, the terqsic is huge: I was supposed to work on getting the SiI up and runningbut UPS delivered a nice package today:.

Terasic vs Cheap Clone USB Blaster

About Us Contact Hackaday. It looks like the cheap clone is able to squeeze out bits really fast, teraisc there's quite a bit of software overhead in processing the next byte in the USB packet. We have a prefix with 8 slow clocks, but in between the second and the third slow clock, there's a signal fast clock group.