On Monday 12 November 2018 07:06:14 andy pugh wrote: > I remember hearing of this experiment years ago, but hadn't previously > seen the original source. > > http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.50.9691&rep=r >ep1&type=pdf > > An evolutionary algorithm was used to create an FPGA configuration to > perform a particular task. > Curiously the final working result depended on a block with no logical > connections to the rest of the network. The solution is dependent on a > quirk of the physics of the actual device.
A most interesting paper, one that may reduce the size of an fpga to get a job done. But I didn't see any comparisons to doing it this way to doing it the conventional way while skimming thru this artical. Makes me wonder how big an fpga would be needed to duplicate a mesa 7i90HD with the usual config in it. And how fast its spi interface would be under this sort of a auto-program. From my results here, its just a tad slower transmitting back to the r-pi than it is in reading the r-pi's data transmissions. From the pi end of the cable, the pi can write those 32 bit packets at 42 megabaud, but must be slowed to 25 megabaud when the 7i90HD is sending its responses back. The data seems bulletproof at those speeds. This is of coarse VERY dependent on the cable length, in my case maybe an inch. The difference is more than likely the differences in the waveforms since a 1-0 transition is noticeable faster in rise times compared to the 0-1 transition, which on my 1000mhz sampler, is visibly slower. But to verify that would take an even faster scope, preferably a quad trace which quickly gets out of my pay grade. This one was only $400 from China. :( Thanks for finding and posting that Andy. -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
