I had a quick look at the IEEE-1355 HIC bus on which spacewire is based
and it seems that although the clock is not on the wire, it can be
reconstructed as an XOR of the strobe and data. So a passthrough
connector sampling those lines (differential) with RS-644 receivers and
a quad NAND may
On 05/02/11 19:43, x...@darksmile.net wrote:
I wonder if there is any value to performing a FFT on the data.
Not really. The added noise is clearly visible in the time domain and
does not form a very meaningful view in the frequency domain. With a
suitable pre-processing a histogram tells
On 06/02/11 07:14, Hal Murray wrote:
I've got a system at work with an internal clock oscillator that I want to
get some statistics on, but there's no direct visibility for the
oscillator, nor do I have a convenient test point that I can probe.
...
Fun problem. Thanks for tossing it out.
On 2/5/11 10:14 PM, Hal Murray wrote:
I've got a system at work with an internal clock oscillator that I want to
get some statistics on, but there's no direct visibility for the
oscillator, nor do I have a convenient test point that I can probe.
...
Fun problem. Thanks for tossing it out.
On 2/6/11 12:37 AM, cook michael wrote:
I had a quick look at the IEEE-1355 HIC bus on which spacewire is based
and it seems that although the clock is not on the wire, it can be
reconstructed as an XOR of the strobe and data. So a passthrough
connector sampling those lines (differential) with
Here's an interesting problem..
I've got a system at work with an internal clock oscillator that I want
to get some statistics on, but there's no direct visibility for the
oscillator, nor do I have a convenient test point that I can probe.
I can divide it down by an arbitrary number to
In message 4d4d6bf6.8070...@earthlink.net, jimlux writes:
First, this isn't that different from the analysis used in the NTP
protocol, so you should read that with an open mind.
Or, given that the interval between ticks is one
of 28 or 29 discrete values
If you can reliably bin your
On 2/5/11 7:30 AM, Poul-Henning Kamp wrote:
In message4d4d6bf6.8070...@earthlink.net, jimlux writes:
First, this isn't that different from the analysis used in the NTP
protocol, so you should read that with an open mind.
That is what got me started thinking it was doable at all.
(PTP 1588 as
On 05/02/11 16:25, jimlux wrote:
Here's an interesting problem..
I've got a system at work with an internal clock oscillator that I want
to get some statistics on, but there's no direct visibility for the
oscillator, nor do I have a convenient test point that I can probe.
I can divide it down
On 2/5/11 8:11 AM, Magnus Danielson wrote:
On 05/02/11 16:25, jimlux wrote:
Here's an interesting problem..
I've got a system at work with an internal clock oscillator that I want
to get some statistics on, but there's no direct visibility for the
oscillator, nor do I have a convenient test
On 05/02/11 17:30, jimlux wrote:
On 2/5/11 8:11 AM, Magnus Danielson wrote:
What you can do is you generate your tick clock at any division greater
than 7*14 (if I understood the timing correctly). Say you divide your
clock with 200 (about 3 us period if I got it right). Then you would get
I wonder if there is any value to performing a FFT on the data.
-GKH
Quoting jimlux jim...@earthlink.net:
Here's an interesting problem..
I've got a system at work with an internal clock oscillator that I want
to get some statistics on, but there's no direct visibility for the
oscillator,
I've got a system at work with an internal clock oscillator that I want to
get some statistics on, but there's no direct visibility for the
oscillator, nor do I have a convenient test point that I can probe.
...
Fun problem. Thanks for tossing it out.
I see two approaches. Are there
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