Trying to add PLCC68 socket from the smd-special.lbr

Am 21.09.2016 um 00:01 schrieb Paul Romanyszyn:

On 09/20/2016 05:13 PM, Martin Larsen wrote:

Hi. I'm new to Eagle. I know the very basics of how to use it, but I

have some problems adding a part to my board. I wan't to add a PLCC68

socket, which is included in the smd-special library. I just want the

empty socked and I can wire up all the connections manually.

 

However, the socket cannot be found when in schematics mode, where I

would normally add it. I can only find it when in board design, and

there I'm not allowed to add it. I get the error "Can't backannotate

this operation. Please do this in the schematic!", which as I said is

not possible because the part does not show up there.

 

Can I seriously not just add an unnamed socket to my board and have me

wire up the connections manually? Do I really have to create a whole

new part with every pin predefined? That would be insane, and

incredibly frustrating for a newcomer like myself. I could see myself

end up using hours figuring that out

 

The specific part I'm trying to add is PLCC-68 SMTL-TT. It's for a

Motorola 68000 on a Neo Geo MV-1C.

 

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Yes you need to make or use a schematic symbol with 68 pins and have

that connected to the pads for layout. Then add your connections in the

schematic.

 

Or you can start with just a board and no schematic. In this mode you

can just add pads and traces. You still need to assign the same net name

to the pads you want to connect.

It is best to learn how to make parts and use a schematic with the

correct port names on the pins in the schematic.

Paul R.

The "usual" way of doing a project is to draw a schematics and then

layout the board.

However if you just want to wire a few sockets together then you don't

need a schematic at all.

Just open a board throw your sockets on it and wire them together.

There are no electrical rules checks possible of course.

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Mit freundlichen Grüßen / With best regards

Joern Paschedag

But like I said in my first post, this does not seem to work. I can find the socket in board view, but I'm not able to add it. Does this work for you? I have mentioned the specific part and library in my first post.

But like I said in my first post, this does not seem to work. I can find the socket in board view, but I'm not able to add it. Does this work for you? I have mentioned the specific part and library in my first post.

Hi

You can create a board without a schematic but you must only have a board

editor open and not a schematic editor also because if they are

'consistent' (forward and back annotation is active and in play) you won't

be able to add footprints to the board. FYI - These footprints are called

elements on the board but called packages in the library.

The exception to having the two editors open is once the schematic/board

have become inconsistent (different),once acknowledged, Eagle will not

consider the other and it is as if the other is not open.

So now you have only a board open you can add packages to it.

After the packages have been added you use the 'Signal' function to

logically connect the pads/smd. This will draw an air-wire between your

connection points so you can see what needs connecting with copper traces.

Next you use the route command to route between the pads/smd. Having placed

the signal wires previously you now can take advantage of some of the Eagle

magic. Routing snaps to the nearby pads and even if you do not finish a

route, the air wire reminds you what needs doing. Use the ratsnest function

often in this case and the air-wires will be recalculated making it clear

to you the routing that remains. Remember it can only inform you thus if

you have informed eagle of all the electrical connections you desire by

using the signal functionality.

HTH

Warren

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Thanks, opening the board view first I am indeed able to add the socket, and wire it manually. I was not aware that opening a schematic first would prevent me from doing this