On Monday 22 September 2014 08:01:55 Axel Zöllich did opine And Gene did reply: > > > How to demux in HAL then? > > > > What do you want to demux? ie, what inputs to what outputs and > > controlled by what? > > 1 out of 4 demux this is: > two 7i76 in pins demuxed to 4 hal signals (choosen joint X or Y or Z > or A)
That would be a function similar to half of a 74HC138. I do not see a likely candidate for such a function. However since it also needs an enable line to enable/disable the selected output. it is not going to be a huge wire saver in the interconnection. It would still need 3 wires. to fully control 4 outputs. And those 4 outputs would still need to be developed outside the 7i76 by doing the 2 to 1 of 4 decoding in an '138 logic chip. But to do that, putting power,ground,chip enable and 2 information bits to do that 1 of 4 selection in the dirty side would need 5 wires to the chip, be subject to all sorts on induced noises in the cabling. Doing it in hal and using 4 gpio's uses only 4 wires and makes more sense to this old C.E.T. Or perhaps I am miss interpreting what you are saying? Humm, you did say "in" pins. The decode function itself is still the same, and I believe you could do that in 4 lut5 modules, all driven by those 2 signals, but with 4 different "personality" setp's applied. The outputs of the lut5's would then give you the 1 of 4 decoding you need. Deciphering a new MPG pendant? > Axel 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> US V Castleman, SCOTUS, Mar 2014 is grounds for Impeaching SCOTUS ------------------------------------------------------------------------------ Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
