Meanwhile, during a fast clock group, the clock toggles at 6MHz. I was supposed to work on getting the SiI up and running , but UPS delivered a nice package today:. We see a similar pattern, but interestingly enough, it’s not the same. The set of signals below that is a slightly zoomed in version of the one above. The most important signal here is TCK, in yellow. In the middle we have the expected 16 fast clock groups. Zooming in on the slow clocks, we see a clock frequency of kHz.
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Terasic vs Cheap Clone USB Blaster
Uusb 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. 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: But the cheap clone runs TCK at exactly double the speed of the Terasic, and both devices only use a flimsy, cheap flat cable.
As I wrote earlierthe biggest issue with the cheap clone is that it doesn’t work on my eeColor Color3 board.
Meanwhile, during a fast clock group, the clock toggles at 6MHz. For the cheap clone, the spacing is huge: And here’s the equivalent of the cheap clone.
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 set of signals below that is a slightly zoomed in version of the one above. We see a similar pattern, but interestingly enough, it’s not the same.
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Terasic vs Cheap Clone USB Blaster | Details |
In the middle we have the expected 16 fast clock groups. And at the end you have a suffix with 2 slow clock cycles. 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.
I was supposed to work on getting the SiI up and runningbut UPS delivered a nice package today: My money is on the clock speed: There are 3 major sections: While the Terasic was rock solid in its communication with the Color3 board. About Us Contact Hackaday.
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The Terasic doesn’t have that problem: The most important blastsr here is TCK, in yellow. A fast clock group sets the clock at 12MHz instead of 6MHz. I was supposed to work on getting the SiI up and runningbut UPS delivered a nice package today:. In addition, there are roughly 3 idle cycles between a fast clock group.
USB Blaster Cable
It’s not that it’s broken: It may be that 12MHz is really just pushing things too much. Yes, delete it Cancel. The suffix is really different, with 6 clock clocks but also a fast clock group in between.
In the middle there are 16 groups with fast clock cycles each group is itself 8 clock cycles. Zooming in on the slow clocks, we see a clock frequency of kHz. 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 fast clock groups are used to rapidly scan data in and out of a scan data register.
For the overview, look at the upper set. A really interesting difference is in the spacing between fast clock groups: 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.