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Symbol Creation Format
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Derek
Hi,
I am learning how to create schematic symbols using the Component Library Editor. The proces for creation of schematic symbols is easy to use. But I need some advice on the format of the creation of a symbol for a Lattice MACH 230. The MACH 230 is a 84 pin PLCC, which the pin connections are: 64 I/O pins 6 Vcc pins 8 GND 4 CLOCK / Input 2 Input I started out creating the smybol as detailed in the Datasheet, but have read the KiCad Library Convention. Section S4.2 indicates that pins should be grouped by function. If I follow the convention, all 64 I/O pins will be grouped together. Is this the correct way to create the symbol? There are symbols availble on Github that do not follow this convention. -- Regards, Derek |
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Andy Eskelson
The correct way is often the way that works for you.
Devices like PLCCs are not really the same as something like a LS7400 where all the pins have a specific fixed functions. With PLCC's and uP's it makes for much better reading if the pins are named for the function that they are providing for the project. i.e. If I use a PIC microcontroller for a project, I would grab the basic component, make a copy and name the pins for what I need, such as display1, 2, 3, temp-sensor1, speed-sensor etc. This makes it much easier to read the circuit rather than seeing a pin that can be configured for multiple functions and wondering what I decided to use it for. (Especially when coming back to the design after a while) In the case of the 230, it would seem to make most sense to group the i/o pins into the 8 pin blocks as per the datasheet and leave it at that. The Vcc's can be grouped, as can the other few functions. You don't really want to mix other functions within the general purpose i/o, that just makes drawing up the circuit rather messy. Andy On Thu, 13 Sep 2018 12:27:47 +0100 "Derek derek@... [kicad-users]" <kicad-users@...> wrote: Hi, |
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this will be a pita very soon as you end up using the same item over and over again in an new project with different functions. I always label my wires with their functions so i end op having named tracks on my pcb as well. the part itself is not changed.
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Simon On 14-09-18 02:19, Andy Eskelson andyyahoo@... [kicad-users] wrote:
The correct way is often the way that works for you. --
Met vriendelijke Groet, Simon Claessen drukknop.nl |
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Andy Eskelson
YMMV
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I find naming the pins on the device very useful. Each project is unique, and I have no problems in creating a specific component for each project. Like you I also name wires. It's nice to have the choice :-) Andy On Fri, 14 Sep 2018 08:01:37 +0200 "'info@...' info@... [kicad-users]" <kicad-users@...> wrote: this will be a pita very soon as you end up using the same item over and |
¿ªÔÆÌåÓýHi
I think I play in the 2 leagues.
I reduce the pin naming to the function
in use and the name the net acording to were its connected to.
For example, a PIC pin described in the
datasheet as "RC4/C3OUT/TX/CK", gets its name reduced to "RC4" and
the wire (net) named "LED_1" or "LED_1_OUT".
In devices with configurble I/O like a
microcontroller I simply find it too clumsy to use the full list
of features on eve1ry project.
In my main library I use the full
datasheet naming, but for the schematic I make a copy of the
symbol to a project specific library and then adjust the pin
namings to the project specific usage, and even move the pins
around in order to have the inputs on the left side and the
outputs to the right side.
But, thats just my way, and like in
almost everything in life each one has is own preferences.
Best regards
Jorge
s 11:50 de 14/09/2018, Andy Eskelson
andyyahoo@... [kicad-users] escreveu:
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