ALTERA TERASIC BLASTER DRIVER

Zooming in on the slow clocks, we see a clock frequency of kHz. There are 3 major sections: The most important signal here is TCK, in yellow. It’s not that it’s broken: What remains is the question about why the cheap clone doesn’t work. And here’s the equivalent of the cheap clone.

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A really interesting difference is in the spacing between fast clock groups: 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: As I wrote earlierthe biggest issue with the cheap clone is that it doesn’t work on my eeColor Color3 board. The cheap clone was never able to get reliable contact. I was supposed to work on getting the SiI up and runningbut UPS delivered a nice package today: 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.

Terasic USB Blaster Cable For Altera – % compatible with Altera USB blaster download cable

The suffix is terawic different, with 6 clock clocks but also a fast clock group in between. Yes, delete it Cancel.

What remains is the question about why the cheap clone doesn’t work. My money is on the clock speed: The Terasic doesn’t xltera that problem: I was supposed to work on getting the SiI up and runningbut UPS delivered a nice package today:.

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While the Terasic was rock solid in its communication with the Color3 board.

And here’s the equivalent of the cheap clone. Meanwhile, during a fast clock group, the clock toggles at 6MHz. We see a similar pattern, but interestingly enough, it’s not the same.

Terasic – USB Blaster Cable – USB Blaster Download Cable

In addition, there are roughly 3 idle cycles between a fast clock group. There are 3 major sections: Zooming in on the slow clocks, we see a clock frequency of kHz.

But the cheap clone runs TCK at exactly double the speed of the Terasic, and both devices only use a flimsy, cheap flat cable. It looks like the cheap clone is able to squeeze out bits really fast, but there’s quite a bit of software overhead in processing the next byte in the USB packet.

And at the end you have a suffix with 2 slow clock cycles.

Terasic vs Cheap Clone USB Blaster

The most important signal here is TCK, in yellow. 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 JTAG TAP from iDLE state to the scan DR or scan IR state, and that the aotera clock groups are used to rapidly scan data in and out of a scan data register.

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In the middle we have the expected 16 fast clock groups. The set of signals below that is a slightly zoomed in version of the one above.

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Altera USB Blaster Driver Installation Instructions

In the middle there are 16 groups with fast clock cycles each group is itself 8 clock cycles. This is the first transaction that travels wltera the JTAG cable when you issue the “nios2-terminal” command. It’s not that it’s broken: When you zoom in on the slow clock cycles, you can measure a TCK frequency of kHz: A fast clock group sets the clock at 12MHz instead of 6MHz.

It may be that 12MHz is really just pushing things too much. All processing is done with a simply state machine. About Us Contact Hackaday.