Difference between revisions of "Layout XL and IHP SG13S"

From ift
(Created page with "= Before starting layout = Read the Design Kit User Guide. Especially the part of connecting the substrate (chapter 8.2) and layout (chapter 9). Also make sure you understand...")
(No difference)

Revision as of 10:43, 12 April 2016

Before starting layout

Read the Design Kit User Guide. Especially the part of connecting the substrate (chapter 8.2) and layout (chapter 9). Also make sure you understand the Layout Rules document.

Documentation.png

If your laying out just one cell (in our case a SRAM-cell) make sure it contains defined values and not just pPar("")-values. This makes it easier to produce the right transistor-sizes etc. If you do not want to change your schematic, make a copy to another cell (e.g. from "sram" to "sram-fixed").

Layout XL

From the schematic click Launch -> Layout XL to open the layout environment.

Layout.png Layout2.png

Layout XL opens with a new black empty canvas. The schematic window also opens. This is very useful as when we add our devices in the layout we can see which device they represent in the schematic as they get highlighted.

Before anything you must define some options to avoid a lot of DRC-errors down the line. In the Layout Rules-document we read what our drawing-grid restrictions are (bottom of page 10). In Layout XL press E to open the Display Options-window. Remember that all size-values are in micrometers. Set the X and Y Snap Spacing to reflect the grid rules. Now press Shift-E to open the Layout Editor Options. Set gravity on(you can turn this off later with the g-key if you dont like it), and aperture around 0.1. This defines the the distance before snapping to another object etc.

Grid.png Gravity.png