Not true, the configuration is loaded from EEPROM to RAM on power up.
Bruce
Azelio Boriani wrote:
By preload I think you mean the configuration step of the logic. It seems
that the Xilinx one stops the clock after the configuration is done. Anyway
using small EEPROM based CPLDs you have no
On Fri, 27 Apr 2012 12:03:20 -0700, Jerry Mulchin wrote:
You might want to take a look at the Atmel XMEGA parts. Far more
capabilities than the ATMega parts.
Watch out .
If using an Xmega make sure to select the U ... Usb ones.
Most of the non U parts have an errata list longer than the
I have a 5370B with a -60111, and a 5335 with a dead 10544.
I also have a 10811D sitting on the desk.
I have been through the 10811A/B manual, and what looks like an
extension for the D/E and various -XXX versions.
It looks to me like the D is a drop in replacement for the A, but did
not see
configuration is loaded from EEPROM to RAM on power up
For every kind of logic? Even for the simplest XC3000 series (and the
Altera equivalent EPM3000 series) small EEPROM CPLD?
On Sat, Apr 28, 2012 at 9:04 AM, cfo xne...@luna.dyndns.dk wrote:
On Fri, 27 Apr 2012 12:03:20 -0700, Jerry Mulchin
By checking the 10811A/B manual and the 10811D/E specifications they are
perfectly equal. Pinout is the same as can be seen here
http://www.qsl.net/d/dk7nt/cro/download/5091-1639E.pdf
compared with
www.hparchive.com/Manuals/HP-10811AB-Manual.pdf
On Sat, Apr 28, 2012 at 11:19 AM, Christopher
I guess you wanted to refer to the old XPLA PZ3k/5k CoolRunner series
bought from Philips, renamed XCR3k/5k, and later enhanced to
XPLA3/XCR3kXL, not the antique FPGA family XC3k...
(C)PLDs don't need an external memory for configuration storing, it's
internal.
There are also some Lattice,
On 04/28/2012 02:39 AM, Hal Murray wrote:
The quake talk was not on line so I watched the one on Climate Change and
it's impact on N. California. Interesting, but no human impact data, only
wildlife.
It's up now.
http://online.wr.usgs.gov/calendar/2012/apr12.html
For a good time sink,
On 4/27/12 5:39 PM, Hal Murray wrote:
Back to somewhat time-nutty stuff...
Does anybody understand how they are using GPS and/or have performance numbers?
They don't need the actual position (DC), just the changes in position. They
need it now. They can't wait for post processing. I'm not
http://www.isgtw.org/feature/open-hardware-creating-more-open-world
Includes photo of the Atomic Wristwatch!
Regards,
--
Sanjeev Gupta
+65 98551208 http://www.linkedin.com/in/ghane
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Google for: high rate gps seismology
You will find many wonderful papers that describe this new field.
Start with: http://www.colorado.edu/engineering/GPS/Larson_Seismology2009.pdf
/tvb (iPhone4)
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To
Hi Hal:
In the talk there was a slide showing a comparison between ground position calculated from an accelerometer and a real
time precision GPS.
The Accelerometer is AC coupled and so misses the DC coupled GPS answer that
shows the permanent ground movement.
I'm guessing it takes a GPS
First, I'd like to thank Magnus, Joe, Paul, and Ed for taking the time
to provide answers, ideas, and challenges to my assumptions. It has all
been very helpful. I'm still working on it so I don't have a resolution
yet.
Second, pictures. If anyone is interested, check out
I have not studied CPLDs but Actel has the only true Flash based FPGAs. The
flash cells directly control the FPGA fabric. As such, they are mostly immune
to Single Event Upset that plagues just about any other FPGA technology, and
there is no configuration step at power up.
Didier KO4BB
Sent
Ed
Several comments
Great pix with the right level of detail to actually see and analyze stuff.
Second what a find you have there. A real mans RB nothing small about the
gas cells.
Good also to see many what I consider to be common components of the late
60s and 70s. Also I noticed little or no
Yes, that photo of Billy with my 5071 has always been a favorite.
http://www.leapsecond.com/pages/atomic-bill/
There's a lesser known one too...
http://www.leapsecond.com/pages/atomic-tom/
/tvb
- Original Message -
From: Sanjeev Gupta gha...@gmail.com
To: Discussion of precise time
Brooke,
In the papers they were getting some results with even 1 Hz sampling,
but, as expected, 10 Hz was better. That's probably sufficient for seismic
waves; 100 Hz is overkill. See Figure 5 of the Larson paper I for a nice
example of the AC vs. DC coupling that you mentioned.
I also agree
Thanks for the cross-check (and the links)!
The 5091-1639E.pdf datasheet was the piece I was missing. The only D/E
docs I had found were advert and per - sub model stability specs.
No pinout, voltage, schema info.
On 4/28/12 4:31 AM, Azelio Boriani wrote:
By checking the 10811A/B manual
Ed, nice pix, thanks.
Looking at the Elko Varicon I have in hand (DXX455-1000-3) the contacts are
essentially hermaphroditic. This chassis mount housing gives up its contacts
fairly easily, just unbend a tab to release. Turn them 90 degrees and you have
something that works like the mating PCB
Yes, I should have been more specific.
The details about the state machine clock behaviour aren't on the
datasheet and were obtained by asking Xilinx.
The reason for using CMOS RAM to controll the CPLD interconnections is
to reduce the static power consumption well below that possible when
On 4/28/12 12:10 PM, shali...@gmail.com wrote:
I have not studied CPLDs but Actel has the only true Flash based FPGAs. The
flash cells directly control the FPGA fabric. As such, they are mostly immune
to Single Event Upset that plagues just about any other FPGA technology, and
there is no
Hi Tom:
The USGS talk was the first time I'd heard about the need to look at an earthquake as happening along some length of
fault line. For the big quake in Japan the forecast software assumed a point source for the quake and that cause them
to under estimate the magnitude and get other
Paul,
On 4/28/2012 1:26 PM, paul swed wrote:
Ed
Several comments
Great pix with the right level of detail to actually see and analyze stuff.
Second what a find you have there. A real mans RB nothing small about the
gas cells.
Exactly. I can use this as an experimental platform for various
Bob,
On 4/28/2012 2:33 PM, Robert LaJeunesse wrote:
Ed, nice pix, thanks.
Looking at the Elko Varicon I have in hand (DXX455-1000-3) the contacts are
essentially hermaphroditic. This chassis mount housing gives up its contacts
fairly easily, just unbend a tab to release. Turn them 90 degrees
By the way, Actel is now part of Microsemi, with all that it entails.
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: Jim Lux jim...@earthlink.net
Sender: time-nuts-boun...@febo.com
Date: Sat, 28 Apr 2012 14:19:40
To:
Fellow time-nuts (and Tom in particular),
I am now seeing the effects of the article a few days earlier. At least
two friends wants to play around. One of my friends wants to drive a
classic clock from a rubidium. I recommended him to take a look at the
PICDIV and he kind of liked it.
So,
Brooke,
Right, an overloaded accelerometer is a problem -- if you have
only one or a few of them.
But the beauty of using cellular sites is that you have hundreds
or thousands of them across populated areas; so it's no problem
if the a bunch of sensors near the epicenter overload. A clipped
Hi Tom:
They do use two different seismometers at each location, a large movement and a
sensitive.
http://www.prc68.com/I/Seismometer.shtml
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Clarke4Congress.html
Tom Van Baak wrote:
Brooke,
Right, an overloaded
Ed,
On 04/29/2012 12:11 AM, Ed Palmer wrote:
Paul,
On 4/28/2012 1:26 PM, paul swed wrote:
Ed
Several comments
Great pix with the right level of detail to actually see and analyze
stuff.
Second what a find you have there. A real mans RB nothing small about the
gas cells.
Exactly. I can use
WIWAUG (when I was an under grad), it was explained to me that the seismometers
were log scale and basically don't clip. When you get into a big event, the
last few decimal places just don't matter.
We also used differential GPS across known fault lines to measure slip both
over time and
On 4/28/12 3:32 PM, Tom Van Baak wrote:
Related to that, are there any seismometer experts on the list? I've
always wondered why they don't augment the extremely sensitive
detectors with less sensitive detectors? Of course a really good
detector will overload; so just co-locate cheap detectors
Hi Ed,
On 04/28/2012 08:43 PM, Ed Palmer wrote:
First, I'd like to thank Magnus, Joe, Paul, and Ed for taking the time
to provide answers, ideas, and challenges to my assumptions. It has all
been very helpful. I'm still working on it so I don't have a resolution
yet.
Happy to help, while not
In the early 1980's I visited the dominion radio astronomy observatory in
Canada.I observed a bunker like structure and asked my host what it
contained, he advised me that it housed a special seismograph that would only
be of use in the event of a large earth quake.
Sent from my iPod
Greetings to the time keepers,
We used to use those connectors way
back in the dark ages in GE Numerical
Controlled machine tool controls to connect
daughter boards to the mother board as I recall.
It is a bifurcated (?) connector and
We called them ELCO connectors.
Check
Hi Brooke,
Hi Tom:
They do use two different seismometers at each location, a large movement
and a sensitive.
http://www.prc68.com/I/Seismometer.shtml
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/Clarke4Congress.html
It is a bit fun that the
Other thing I have no clue to. What happens to photocells after X years.
I suspect they degrade also. Since thats the frontend of the rcvr that
would do quite a number.
Regards
On Sat, Apr 28, 2012 at 7:37 PM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
Hi Ed,
On 04/28/2012 08:43 PM,
I enjoyed the talk, thanks to the OP for pointing it out. Of course, I
would have liked more detail on the GPS!
73,
David GM8ARV
--
SatSignal software - quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
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