On 10.09.13 20:34, Russell Brown wrote: > Quoth andy pugh..... > Ah... so I can't connect pyvcp.x-minus and xhc-hb04.jog.minus-x to > halui.jog.0.minus, without an or2, because of: > > >An OUT pin can be connected only if there are no other OUT or IO pins on > >the signal > > Which one could paraphrase as being "An IN can only have one OUT > connected to it". > > Isn't English wonderful :-)
Yup. It's analogous to TTL or CMOS logic; what's not permitted is connecting two OUTs together, because of contention. The two outputs will at times have different states, but a common connection can only ever have one at any instant. In software logic, the only consequence is an undefined state, but in any hardware logic family with totem-pole outputs, connecting two contending outputs will try to short-circuit the power supply. That can let the magic smoke out. Erik -- Tecoma's Macca's-striking flash mob: http://www.youtube.com/watch?v=H7-0T1vbnWE Stop fat food joint opposite Tecoma preschool: www.change.org What's cooking: https://www.facebook.com/pages/NO-McDonalds-in-The-Dandenong-Ranges/220419864641673 ------------------------------------------------------------------------------ How ServiceNow helps IT people transform IT departments: 1. Consolidate legacy IT systems to a single system of record for IT 2. Standardize and globalize service processes across IT 3. Implement zero-touch automation to replace manual, redundant tasks http://pubads.g.doubleclick.net/gampad/clk?id=51271111&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
