[time-nuts] An embedded NTP server

[shalimr9 at gmail.com]

I have had that "problem" more than once. Missing Vcc on a chip  but the thing runs, just not necessarily well enough, or well enough to go through the next level of test.

I have also used it when adding an inverter somewhere on a clock line, and a decoupling cap on the inverter's Vcc is enough to keep it running. Saves a jumper.

Didier


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-----Original Message-----
From: Poul-Henning Kamp <phk at phk.freebsd.dk>
To: Discussion of precise time and frequency measurement <time-nuts at febo.com>, Bob Camp <lists at rtty.us>
Sent: Tue, 01 Jan 2013 2:16 PM
Subject: Re: [time-nuts] An embedded NTP server

--------
In message <AA21D17C-0FF4-4B22-B3A3-43AC2B9DAA58 at rtty.us>, Bob Camp writes:

>I'm not bashing the Arm parts, [...] They worry about every uA of
>current drain

True story:

Many years ago when the very first ARM silicon arrived and they started
testing it, it was generally execeeding expectations but a little bit
flakey at high clock rates.

After the bubbly had been drunk and hangovers subdued, the serious testing
started and one of the first thing they found was that they had forgotten
to hook up VCC:  The chip ran entirely on leaked power from the I/O pins,
most notably the #RESET pin.

When they also connected the VCC pin, it was stable well above spec'ed
speed.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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