Ah, I took 1999 as I thought that was the only relevant date for another 1024 weeks, I'm not familiar with the shifted 1024 week period so will take a look at that. Does "shifted" imply a shift at the whim of the manufacturer, ie could it explain why these boards might have been ok a few years ago but not now? Oh dear, I think a wee light bulb has just exploded:-) I haven't checked this yet, but if shifting means to start a 1024 week period that's approximately from or not too far before the date of manufacture, either for individual units or just as a ballpark for a given production run, that would buy them nearly twenty years from then, which would mean these boards should still be ok. If shifting means to do this say at the design stage or starting with the first production run then they might buy twenty years from then but regardless of individual manufacturing date. I'm not too sure that even the earliest of these boards should be twenty years old yet, but if plan Z was to stick with some previously picked arbitrary date, such as company formation or granny's birthday, then that might well be the answer:-) Thank you, will definitely look more closely at this, perhaps it's not time yet to put the boards back into hibernation after all:-) I agree re the TMS29F010, and I'm sure I could read it, but would definitely need an adapter for that. Regards Nigel GM8PZR In a message dated 10/02/2014 01:40:44 GMT Standard Time, [email protected] writes:
It probably operates on a shifted 1024 week period and that was probably not changed after the original code was written. Obviously the shifted wrapping has now occurred. 1999 is only relevant for the non-shifted 1024 period. > It is possible to set the board for other than GPS, (Timecode, Freerunning, > or 1PPS) but I suspect I might then loose the conditioning, something I'd > need to check. Either way, I'd like to have the correct GPS date too if > possible, but it's the conditioning that's of more interest so I'd do without > the correct date if needs be. > > I've identified two programmable devices, the version H manual with > schematics is very useful:-), the first being a OTP configuration PROM for the > Spartan FPGA and the other a TMS29F010 flash mamory IC which I suspect holds > the firmware. That is socketed but I don't think I have the necessary 32 > pin quad adapter to be able to read it. It would be the TMS29F010 flash which would be of interest. > This was only intended to be a quick test, funny how "quick tests" soon > become major projects:-), so these might have to go back into hibernation > again shortly, for the time being at least. Fair enough! Cheers, Magnus _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
