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 from my BlackBerry Wireless thingy while I do other things... -----Original Message----- From: Azelio Boriani <[email protected]> Sender: [email protected] Date: Sat, 28 Apr 2012 00:57:42 To: Discussion of precise time and frequency measurement<[email protected]> Reply-To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] PICTIC II ready-made? FPGA with internal flash memory to boot from, yes, but I think that small CPLD haven't to boot anything: they should have the interconnection array associated with the EEPROM cell array. On Fri, Apr 27, 2012 at 11:52 PM, David <[email protected]> wrote: > On Fri, 27 Apr 2012 22:13:55 +0200, Azelio Boriani > <[email protected]> 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 clock at all: there is no > >configuration to load. > > Wouldn't that also apply to an EEPROM based FPGA? I have been > thinking that SRAM based devices may be a better match in cases where > you only want to have to program one device. > > _______________________________________________ > 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. > _______________________________________________ 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. _______________________________________________ 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.
