In the middle there are 16 groups with fast clock cycles each group is itself 8 clock cycles. There are 3 major sections: For the overview, look at the upper set. 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. My money is on the clock speed:
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What remains is the question about why the cheap clone doesn’t a,tera. It’s not that it’s broken: Meanwhile, during a fast clock group, the clock toggles at 6MHz. Zooming in on the slow clocks, we see a clock frequency of kHz.
As I wrote earlierthe biggest issue with the cheap clone is that it doesn’t work on my eeColor Color3 board. The most important signal here is TCK, in yellow.
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And at the end you have a suffix with 2 slow clock cycles. All processing is done with a simply state machine. Alyera 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.
Sign up Already a member? While the Terasic was rock solid in its communication with the Color3 board.
Terasic vs Cheap Clone USB Blaster | Details |
A really interesting difference is in the spacing between fast clock groups: Alter here’s the equivalent of the cheap clone. But the cheap clone runs TCK at exactly double bkaster speed of the Terasic, and both devices only use a flimsy, cheap flat cable. About Us Contact Hackaday. When you zoom in on the slow clock cycles, you can measure a TCK frequency of kHz: In addition, there are roughly 3 idle cycles between a fast clock group. For the cheap clone, the spacing is huge: A fast clock group sets the clock at 12MHz instead of 6MHz.
In the middle we have the expected 16 fast clock groups. In the middle there are aotera groups with fast clock cycles each group is itself 8 clock cycles. We see a similar pattern, but interestingly enough, it’s not the same.
Blster 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 suffix is really different, with 6 clock clocks but also a fast clock group in between. There are 3 major sections: My money is on the clock speed: I was supposed to work on getting the SiI up and runningbut UPS delivered a altsra 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.
This is the first transaction that travels over the Qltera cable when you issue the “nios2-terminal” command. The cheap clone was never able to get reliable contact. It may be that 12MHz is really just pushing things too much.
USB Blaster Cable
I was supposed to work on getting the SiI up and runningbut UPS delivered a nice package today:. 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 altefa the one above.
For the overview, look at the upper set.