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no help

Layer setup

by anonymous - 25 Nov 2009, 16:45 CET

My question is probably obvious to most users, but unfortunately not to me: I have decided to make a testchip in AMI C07M-A (now On-semi, 0.7u CMOS). I have the design rules, electrical rules, etc.

I wanted to start by inputing the layer map, but I don't understand the following: in the AMI documentation, the mask identification is tabulated as follows:

"Mask, IGS layer, Description"
So for e.g. Nwel, Mask=10, IGS=1, Description=N-WELL

Should I use the LayoutEditor layer manager to have the GDS layer correspond with the IGS layer and ignore the Mask number? I.e., in the case of the example should I use GDS_layer_1="N-Well" and forget about Mask=10? Or should I handle this differently?

Thanks in advance for clearing this matter...

by Juergen Thies - 26 Nov 2009, 9:46 CET

I am not familar with the On-semi technology, but i can imagine to interpret the additional value in two different ways:

- Beside the GDSII layer number some technologies required a correct set datatype. If this value should be the datatype, please activate "map layer on open/save" for the GDSII file format in the setup and enter the value in the layer manager.

- As the GDSII layers are sometime unsorted, the value can be the technology order of the layers. If so, please order the layers in the netlist/technology in a corresponding way. This is only required, if you want to use the connectivity/LVS feature.

by anonymous - 26 Nov 2009, 12:07 CET

I just contacted On-semi about this; they mentioned that I can use the IGS number as GDS number and can ignore the mask number.

Thanks for your advice concerning layer mapping with respect to LVS.

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The LayoutEditor™ is a program to design and edit layouts for MEMS/IC fabrication and CMOS IC design .Designing these layouts require a high precision. In IC design a sufficient resolution and a possibility of a high scaling is required. The resolution of the LayoutEditor can be set in a wide range and is normally set to 1 nano meter. A higher resolution makes no sense due to atomar structures. With this resolution the LayoutEditor can draw elements up to 4 meters. In many IC design houses this is enough for IC/MEMS which extend usually less than 0.1 meters. The productions of MEMS/IC is done in many layers. For each of these physical CAD layers a belonging layer had to exist in the drawing. Additional logical layers are required for describing/naming purpose. So a lot of layers are needed. By default the LayoutEditor is limited to 128 layers. But it can easily be adjusted, if more layers are required. IC Designs often contain a plenty of repeating structures. Essential for micro fabrication of these designs is therefor a hierarchical design. This means, that the complete repeating structure only exists once in a single cell. These cell is then referred multiple times in the main drawing.
Beside the above mems packaging mentioned IC design fundaments it is important to have sophisticated functions to handle all drawing elements. The layout handler has all required functions: all basic design functions, all angle elements, boolean operations, macros, fontgenerator, design rule checker, mems tools, supported format: GDSII, DXF, OASIS, CIF. If you still missing a function, you are free to write a feature request

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