define pins in a loop

[Chenhui]

Hello Ronald,

I have a question about Pin definition.

In a cell, I put a lot of blocks (for example a defined function). Can I define the Pin for each block through an easier way? like a loop?

Besides, if there is something inappropriate in the code, could you please point it out?

Thanks.

Chenhui

# create a pad block from predefined geometries
def bump (pad=30):
    name = "bump_{}".format(pad)
    with nd.Cell(name=name) as C:
        winC = geom.circle(radius=pad, N=300)
        nd.Polygon(points=winC, layer=2).put(0)

        winC = geom.circle(radius=0.8*pad,N=300)
        nd.Polygon(points=winC,layer=3).put(0)
        nd.Pin('out'+str(0)).put(0)

    return C

# create a building block
# IDT
def idt1ch(pad = 30):
    name = "IDT1ch_{}".format(pad)
    with nd.Cell(name=name) as C:

        padN1 = bump(pad=pad).put(293.14, 114.02, 0)
        nd.Pin('out'+ str(0)).put(padN1.pin['out0'])

        padN2 = bump(pad=pad).put(368.14, 113.31, 0)
        nd.Pin('out'+ str(1)).put(padN2.pin['out0'])

        #...???

return C

[Ronald]

Dear Chenhui,

Check out the raise_pins() method.
https://nazca-design.org/manual/code.html?highlight=raise_pins#nazca.Instance.raise_pins

In your example ‘padN1’ is an instance of cell ‘bump’ in parent cell ‘C’. The raise_pins raises the pins of padN1 to the parent level.

padN1.raise_pins()

Ronald

[Chenhui]

Hello Ronald,

Thanks for your quick reply. This is a very useful function.

Firstly, in my case, I should use

padN1.raise_pins(['out0'],['out'+str(1)])

Secondly, I want to make it even easier, for example, using a loop to define all of the PIN together. This should be a basic function in Python. please check below wrong code.

for i in range (2):
    'padN'+str(i).raise_pins(['out0'],['out'+str(i)])

#AttributeError: 'str' object has no attribute 'raise_pins'

Chenhui

[Ronald]

Dear Chenhui,

Thank you, good catch, I edited it in the original post.

Your example raises pins for multiple instances. If the instances are added to a list you can iterate over them.

padN = [] 
with ...
    ...
    padN.append(bump(pad=pad).put(293.14, 114.02, 0))
    padN.append(bump(pad=pad).put(368.14, 113.31, 0))

for i, pad in enumerate(padN):
    pad.raise_pins(['out0'], ['out'+str(i)])

[Chenhui]

Dear Ronald,

Thanks a lot.

This is great! The list can be used like this. This will be very convenient for me.

However, I modified the code, since can’t run yours. Did I misunderstand your code “with…”?

padN=[]
padN.append(bump(pad=pad).put(293.14,114.02,0))
padN.append(bump(pad=pad).put(368.14,113.31,0))

[Ronald]

Hi Chenhui,

You are correct.
Just typed it as a concept directly in the edit box rather than in Python.

Ronald

[Chenhui]

All right. The concept is most important. Thanks for your support!

[Author]

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