Fixing README.md wrapping.
Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>
diff --git a/README.md b/README.md
index 6d410f0..e1ef64f 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
# BAG (BAG AMS Generator) Primitives Library for [SKY130](https://github.com/google/skywater-pdk)
-This repository contains the required primitives to use the BAG3 framework with the SkyWater proprietary S8 130nm PDK. You can get access to this PDK through
+This repository contains the required primitives to use the BAG3 framework with
+the SkyWater proprietary S8 130nm PDK. You can get access to this PDK through
signing an NDA and legal agreement with
[SkyWater Technologies](https://www.skywatertechnology.com/).
@@ -20,65 +21,82 @@
of the Berkeley Analog Generator framework (see also
[BAG v2 framework](https://github.com/ucb-art/bag)).
-These primitives are updated for V2.0.0 of the PDK. It currently support layout generation and LVS using Virtuoso pcells, which was previously not supported. Simulations using BAG is also supported.
+These primitives are updated for V2.0.0 of the PDK. It currently support layout
+generation and LVS using Virtuoso pcells, which was previously not supported.
+Simulations using BAG is also supported.
-This workspace and tech plugin are primarily maintained by Ayan Biswas, Felicia Guo, Sean Huang, and Bob Zhou.
+This workspace and tech plugin are primarily maintained by Ayan Biswas, Felicia
+Guo, Sean Huang, and Bob Zhou.
## Technology features and hints
- Layout resolution is in 5nm.
- Min channel length is 150nm, so min channel units is 30.
-- This tech has standard, lvt, and hvt devices. pch hvt and lvt have min channel length of 350um,
- so they cannot be used for logic-style MOS with nch.
+- This tech has standard, lvt, and hvt devices. pch hvt and lvt have min
+ channel length of 350um, so they cannot be used for logic-style MOS with nch.
- Min nch width is 420nm (84 units). Min pch width is 550nm (110 units).
- Widths are quantized in irregular intervals. See the pcells for examples.
- Nch has 840nm. Pch has 1120nm.
- This tech has 5 metal layers and an "M0" (LI) layer.
-- This tech has pcell MOM caps. M1-M2 caps provide ~0.4 fF / um^2. M1-M4 caps provide ~0.74 fF /
- um^2.
+- This tech has pcell MOM caps. M1-M2 caps provide ~0.4 fF / um^2. M1-M4 caps
+ provide ~0.74 fF / um^2.
- This tech has pcell MIM caps, between M3-M4 and M4-M5. Both provide ~2.2 fF / um^2.
-SD pitch: 0.430 um ~ 86 units. BAG quantizes vertical metal pitches to match the SD pitch ~ li, met2, met4
+SD pitch: 0.430 um ~ 86 units. BAG quantizes vertical metal pitches to match
+the SD pitch ~ li, met2, met4
Metal min width and space (um):
-li : 0.170, 0.170
-met1: 0.140, 0.140
-met2: 0.140, 0.140
-met3: 0.300, 0.300
-met4: 0.300, 0.300
-met5: 1.600, 1.600
+- li : 0.170, 0.170
+- met1: 0.140, 0.140
+- met2: 0.140, 0.140
+- met3: 0.300, 0.300
+- met4: 0.300, 0.300
+- met5: 1.600, 1.600
Track manager hints:
- m4 needs to be at least w=5 to connect to m5
### Resistors
-- This tech has two flavors of "precisions" poly resistors: hrpoly (300 ohm / sq) and uhrpoly (2K ohm / sq). Min width is 0.33 um / 66 units, min resistor length is 0.5 um / 100 units. The contacts have a 2.16um length, required by DRC, so the min overall length is 4.82um.
+
+- This tech has two flavors of "precisions" poly resistors: hrpoly (300 ohm /
+ sq) and uhrpoly (2K ohm / sq). Min width is 0.33 um / 66 units, min resistor
+ length is 0.5 um / 100 units. The contacts have a 2.16um length, required by
+ DRC, so the min overall length is 4.82um.
+
- `res_type: standard` ~ hrpoly
Width selection
-- For nice compatibility with the routing grid, make the unit cell width quantized to the sd pitch ~ 430 nm / 86 units. (not a hard requirement)
+
+- For nice compatibility with the routing grid, make the unit cell width
+ quantized to the sd pitch ~ 430 nm / 86 units. (not a hard requirement)
- LR edges account for up to an additional 780nm / 156 unit
- Some good values: 102, 360, 532
Length selection
-- To minimize unused area, quantize unit height to sd pitch ~ 86 for working with the routing grid. (not a hard requirement)
+- To minimize unused area, quantize unit height to sd pitch ~ 86 for working
+ with the routing grid. (not a hard requirement)
- Otherwise, unit height will round up to the next pitch of 86
- TB edges, including taps, account for up to 5.530 um / 1106 units
- Some good values: 270, 614
-
## Abstract Generation
-Abstract generation in this technology does not work out of the box. More details in [this README.](abstract_setup/README.md)
+Abstract generation in this technology does not work out of the box. More
+details in [this README.](abstract_setup/README.md)
## Extraction
-- This tech uses Calibre xRC for extraction. See $PDK_HOME/PEX/xRC and the manual for details.
-- The xRC SVRF is set up to produce SPF files, to match other PEX tools. It can produce Spectre-format
-PEX netlists, but this has not been tested rigorously.
-- xRC automatically capitalizes cell names, so top level cell names need to be full capitalized.
+- This tech uses Calibre xRC for extraction. See $PDK_HOME/PEX/xRC and the
+ manual for details.
+- The xRC SVRF is set up to produce SPF files, to match other PEX tools. It can
+ produce Spectre-format PEX netlists, but this has not been tested rigorously.
+- xRC automatically capitalizes cell names, so top level cell names need to be
+ full capitalized.
-## Licensing
+## License
-This library is licensed under the Apache-2.0 license. See [here](LICENSE) for full text of the
-Apache license.
+To enable wide compatibility with the existing BAG ecosystem, this repository
+is dual-licensed. It is available to you under your choice of the
+[the Apache 2.0 license](LICENSE) or a [3 clause BSD style](LICENSE.alternative).
+
+SPDX-License-Identifier: BSD-3-Clause OR Apache 2.0
