Re: gEDA-user: 74xx series

2004-06-25 Thread John Griessen
Here's another take on the options we have now: When you have need for some gates less than a word width use tiny logic packaged in 4 or 6 or 8 pin packages and do not create slots in the symbols at all, and get the benefit of less spaghetti wiring going hither and yon. When you want 8 or 16

gEDA-user: Multi pin description

2004-06-25 Thread Paul Surgeon
Is there anyway in gschem to have a list of descriptions per pin and then just select which one must be shown? e.g. On a PIC16F628A pin 12 alone has four different functions : RB6, T1OSO, T1CKI, and PGC When I try to add all the pin descriptions to a PIC microcontroller it ends up having to be a

Re: gEDA-user: 74xx series

2004-06-25 Thread Karel Kulhavy
On Fri, Jun 25, 2004 at 05:36:22PM +0200, Levente KOVACS wrote: > > 1) Implicit connections are good when they help minimize the crowding > > of a schematic. > > ... > > > 3) Implict connections are bad for high speed analog where you want to > > > > filter the devices power from the boards powe

Re: gEDA-user: 74xx series

2004-06-25 Thread Levente KOVACS
> 1) Implicit connections are good when they help minimize the crowding > of a schematic. ... > 3) Implict connections are bad for high speed analog where you want to > > filter the devices power from the boards power. I think even a normal TTL gate generates noise on the top of the power supp

Re: gEDA-user: 74xx series

2004-06-25 Thread Samuel A. Falvo II
On Friday 25 June 2004 07:20 am, Stephen Meier wrote: > 1) Implicit connections are good when they help minimize the crowding > of a schematic. Just have a separate page that has nothing but power connections on it. Problem solved. This is a very common practice. > 2) Others who then look at t

Re: gEDA-user: 74xx series

2004-06-25 Thread Xtian Xultz
Em Sex 25 Jun 2004 10:59, Karel Kulhavy escreveu: > On Fri, Jun 25, 2004 at 09:38:10AM -0300, Xtian Xultz wrote: > > Em Qui 24 Jun 2004 21:47, Paul Surgeon escreveu: > > > > We made a new library here. We use to have the integrated circuit in one > > symbol and one symbol with only the power pins.

Re: gEDA-user: 74xx series

2004-06-25 Thread Samuel A. Falvo II
On Friday 25 June 2004 06:57 am, Karel Kulhavy wrote: > I have had some problems with implicit connections on Ronja. > > What's the alternative for implicit connections? Each gate symbol with > power pins? Or 7th gate that has power and gnd pins? Taking a 7400 as an example, you would have five ga

Re: gEDA-user: 74xx series

2004-06-25 Thread Stephen Meier
1) Implicit connections are good when they help minimize the crowding of a schematic. 2) Others who then look at the schematic often ask where is the power and ground (not for ttl since it allways found on the same spot for conventionally shapped chips) 3) Implict connections are bad for high

Re: gEDA-user: 74xx series

2004-06-25 Thread Karel Kulhavy
On Fri, Jun 25, 2004 at 09:38:10AM -0300, Xtian Xultz wrote: > Em Qui 24 Jun 2004 21:47, Paul Surgeon escreveu: > > We made a new library here. We use to have the integrated circuit in one > symbol and one symbol with only the power pins. Both must have the same name, > like U1. To me, it is sim

Re: gEDA-user: 74xx series

2004-06-25 Thread Karel Kulhavy
On Fri, Jun 25, 2004 at 02:13:09PM +0200, Magnus Danielson wrote: > From: Dan McMahill <[EMAIL PROTECTED]> > Subject: Re: gEDA-user: 74xx series > Date: Thu, 24 Jun 2004 20:53:16 -0400 > Message-ID: <[EMAIL PROTECTED]> > > Dan, > > > On Fri, Jun 25, 2004 at 02:47:48AM +0200, Paul Surgeon wrote: >

Re: gEDA-user: 74xx series

2004-06-25 Thread Xtian Xultz
Em Qui 24 Jun 2004 21:47, Paul Surgeon escreveu: We made a new library here. We use to have the integrated circuit in one symbol and one symbol with only the power pins. Both must have the same name, like U1. To me, it is simple to draw, makes the design clean and with a consistent netlist. >

Re: gEDA-user: 74xx series

2004-06-25 Thread Magnus Danielson
From: Dan McMahill <[EMAIL PROTECTED]> Subject: Re: gEDA-user: 74xx series Date: Thu, 24 Jun 2004 20:53:16 -0400 Message-ID: <[EMAIL PROTECTED]> Dan, > On Fri, Jun 25, 2004 at 02:47:48AM +0200, Paul Surgeon wrote: > > How does one wire up the power on the 74xx series of chips in gschem? > > There