Many thanks to everyone for your suggestions and patience.
Short answer, the problem was power related, but more accurately, it was
a shielding problem.
Long answer, it was not immediately obvious as power in the setup itself
didn't seem to be a problem. I need 12v (for the mv89a or 8663
Hi
On Oct 31, 2014, at 7:11 AM, Simon Marsh subscripti...@burble.com wrote:
Many thanks to everyone for your suggestions and patience.
Short answer, the problem was power related, but more accurately, it was a
shielding problem.
Long answer, it was not immediately obvious as power in
Lots more pictures and data uploaded here:
https://drive.google.com/folderview?id=0BzvFGRfj4aFkMFBtNWFSZVBKWkkusp=sharing
In an effort to understand which component was responsible for my ~17us
spikes I decided to go back to basics with just a single DFlop (AC74) on
a breadboard; no BBB, just
Generally speaking, metastability problems with FF's are caused
by an inappropriate timing relationship causing both of the latch
gates to get stuck between a logic 1 and a logic 0. If you are
in the exact right spot, the FF has no way to decide whether to go
up, or to go down, so it just hangs
From: Simon Marsh subscripti...@burble.com
Subject: Re: [time-nuts] BBB DDMTD - analysis
Message-ID: 54524f04.7060...@burble.com
The first few pics (DFlop-unsync-floating-*) show
the Q output, which was unconnected to anything
other than the oscilloscope. They show a few glitches
subscripti...@burble.com said:
In an effort to understand which component was responsible for my ~17us
spikes I decided to go back to basics with just a single DFlop (AC74) on a
breadboard; no BBB, just a couple of oscillators driving the data and clock
pins ...
I don't know what the
subscripti...@burble.com said:
In an effort to understand which component was responsible for my ~17us
spikes ...
17 microseconds is 58 KHz. That's a reasonable number for a switching power
supply.
What does your power look like?
I don't know what you are using for a circuit. My guess is
Am 30.10.2014 um 20:08 schrieb Hal Murray:
17 microseconds is 58 KHz. That's a reasonable number for a switching power
supply.
What does your power look like?
I don't know what you are using for a circuit. My guess is that the crap on
the power is shifting the switching point slightly.
Hi
How about a picture of the “as built” circuit? There may be something about the
construction that’s the issue.
Bob
On Oct 30, 2014, at 10:45 AM, Simon Marsh subscripti...@burble.com wrote:
Lots more pictures and data uploaded here:
This is the second post related to my attempts to create a BBB DDMTD,
the first post had a load of graphs showing details of what was
happening around glitch periods. This post is about interpreting those
graphs.
Pretty obvious from only a cursory glance at the graphs are that
transitions
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