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 Sent from my Droid Razr 4G LTE wireless tracker. -----Original Message----- From: Poul-Henning Kamp <p...@phk.freebsd.dk> To: Discussion of precise time and frequency measurement <time-nuts@febo.com>, Bob Camp <li...@rtty.us> Sent: Tue, 01 Jan 2013 2:16 PM Subject: Re: [time-nuts] An embedded NTP server -------- In message <aa21d17c-0ff4-4b22-b3a3-43ac2b9da...@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 p...@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. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
