On 02:11 PM 9/04/2001 -0700, Abd ul-Rahman Lomax said:
>At 07:27 PM 4/9/01 +0100, Terry Harris wrote:
>>The Cadence schematic stuff I have used a little works like this. Every bus
>>entry/exit has a numeric tag to identify which member of the bus you are
>>connecting. Busses can also be split and merged again with numeric range
>>tags. Symbols can even have bus 'pins' a whole 48 bit data bus on a
>>component can be connected directly to a bus (obviously no pin number
>>information shown).
>Ah, hidden pins! That's really what those are. (Though the Cadence 
>implementation might well be more sophisticated, like being able to 
>connect DATA1-8, hidden, with the bus D[0..7]. Obviously such a scheme 
>could get really hairy if the signals were not simply assigned in 
>numerical sequence)

>You can do this now by hiding the pins, with the name of the pin being the 
>name of the net you want assigned to the pin. Of course, the connectivity 
>would be global. It might be nice if there were a hidden pin attribute 
>that made a net with sheet-only scope, which could be useful for this as 
>well as the hidden power pin problem, where VCC is +5V on one page and 
>+3.3V on another.

Oh no! You are surely not suggesting that someone should hide a bus and use 
hidden pin connectivity are you? I can't see how what Terry described is 
anything to do with a hidden pins.

Bus Pin:
1) You see the bus pin
2) you have control of connectivity (not global)
3) there is a bus wire showing the connections on the schematic.

How does this compare with hidden pins where:
1) you can see the pin
2) net is global always
3) you can't see where the connection is going to.

(I'm glad you go on to say this would

>I'm not entirely thrilled by the idea of hiding pin assignments. It's 
>great for making a nice, neat, compact, readable, schematic, but the 
>technicians will be sticking pins in voodoo dolls with a picture of your 
>face taped on its head. The last thing one wants to do when sweating a 
>deadline, and one needs to know what pin net A5 is on, is to have to look 
>it up somewhere else than the schematic sheet with the part on it.
>But if there were a schematic with many instances of a part, it might well 
>be useful to have a small version of a part with such hidden pins. One 
>could then have the full symbol in one place, showing all the pins, and 
>then the abbreviated version for other instances. It's worth looking into.

Personally, I disagree that it is worth looking into - I think it can only 
take Protel further from improving the visibility of the design.

Ian Wilson
Considered Solutions Pty Ltd     mailto:[EMAIL PROTECTED]
ABN: 96 088 410 002
5 The Crescent
Ph: +61 2 9411 4248   Fax: +61 2 9411 4249

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