irw@stl.stc.co.uk (Ian Woollard) (03/22/90)
In article <9937@portia.Stanford.EDU> bugboy@portia.Stanford.EDU (Michael Frank) writes: >Hi, I just started reading this group and noticed the wireworld discussion, >and I wondered whether anyone had seen before a design that I came up with >for a memory gate. Here it is: > >...=..... >...=..... >..===.... >...=..... >..=.=.... >..=.=.... >====.==== >..=...... >......... > >Description of operation removed< That's neat! I like it! Small and perfectly formed... I can't offer anything that small. However, I'd like to submit my entry for the fastest IBI memory gate in the wireworld 'competition'... The following is a negative going edge-triggered flip flop. (Using this circuit, you can construct counters, dividers and things- though the Transit time does pose a bit of a problem...) ...O......... ...=...===... ...=.===.==.. ....=..=.=.=. ...===.===.=. ...=.=..=..=. ..==.===..=.. .=.===...=... .=......=.... ..======..... .......=.=... ........===.. .....===.=.=. ....=......=. .....=======. ...........I. Transit: 21 (measured from entry of entry of a 'missing' electron) IBI: 5 Size: 16x13 This is essentially made up of two parts: A flip flop that toggles with every electron sent in: ...O......... ...=...===... ...=.===.==.. ....=..=.=.=. ...===.===.=. ...=.=..=..=. ..==.===..=.. .=.===...=... .=......=.... ..======..... .......I..... Transit: 14 IBI: 5 Size: 11x13 This circuit is based on two exclusive-or gates back to back, giving a fast IBI time. And the edgifier circuit (left as an exercise to the reader to cut out!). This emits an electron every time a stream of electrons stops entering it. __ o __. ____ Ian Woollard (0279) 29531 x2384 <_(_/|_/ / <_ irw@stl.stc.co.uk (STC Technology Ltd.) Extremely long and witty saying reduced to a microdot --> .