Differences

This shows you the differences between two versions of the page.

--- tools:layout:start [2024/06/16 16:08] – rajit
+++ tools:layout:start [2025/03/20 20:44] (current) – [Coordinate system] ole
@@ Line 44: / Line 44: @@
 ==== Coordinate system ====
-The coordinate system used by rectangles in this file are designed to work directly with ''magic'''s ''box'' command. In the ''magic'' layout editor, a box specified by
+The internal coordinate system used by rectangles in this file are designed to work directly with ''magic'''s ''box'' command. In the ''magic'' layout editor, a box specified by
 <code>
 :box 0 0 10 20
@@ Line 50: / Line 50: @@
 is of size 10 by 20 units. If we view a box as a collection of 1 by 1 pixels, then this box occupies pixels starting from (0,0) to (9,19). All ''rect''s must be non-overlapping on their respective layers. Note that transistors, diffusion, and poly are all viewed as the same layer.
+the rect command is specifed by 2 coordinate pairs, following the above example:
+<code>
+rect <label> <layer> <x0> <y0> <x1> <y1>
+rect # m1 0 0 9 19
+</code>
 ==== Bounding box ====
@@ Line 56: / Line 62: @@
 A user-specified place and route boundary and bounding box can be specified using the ''sbox'' directive. This has the same syntax as ''bbox'', except it is used to override the bounding box computation within the ACT library.
-==== Abutment and attributes ====
+==== Abutment and alignment ====
 The layout library has support for manipulating layout. To aid in this, a ''.rect'' file can include information about how one cell can be abutted with another during procedural layout generation. A special layer name called ''$align'' is reserved for this purpose.
+A aliment box is required to mark the boundary the next cell is abutted to:
 <code>
@@ Line 64: / Line 72: @@
 </code>
 This means that the box used for abutting this cell with another has the specified coordinates.
+The layout engine checks if it can abut 2 cells by looking up if they have a matching label, so next to the abutmentbox you need to specify abutment markers:
+these markers are just a single coordinate thus the first coordinate pair is just repeated.
 <code>