sky130/README - third_party/opencircuitdesign.com/open_pdks - Git at Google

 ------------------------------------
 open_pdks
 ----------------------------------------
 Master PDK generator for SkyWater Sky130
 Hybrid 180nm / 130nm foundry process
 for open source EDA tools
 ----------------------------------------

 -------------------------------------------------------------------------------
 Quick summary (TL;DR):

     Prerequisites:

     	sudo apt-get install python3

     The Magic VLSI layout tool is used often by the installation.  If you do
     not have it, then obtain it and install with the following:

     	sudo apt-get install m4 tcsh tcl-dev tk-dev

 	git clone https://github.com/RTimothyEdwards/magic
 	cd magic
 	./configure
 	make
 	sudo make install

     Open_PDKs SKY130 Installation: Most people will want to run the following
     for PDK installation:

 	./configure --enable-sky130-pdk
 	make
 	sudo make install

     This will download and install the SkyWater SKY130 PDK, the SKY130 setup
     files for xschem, and a third-party library containing alphanumeric layouts.
     If you prefer an installation in your user space, then use configure option
     "--with-sky130-local-path=<path>" with <path> being some alternative like
     ~/pdks, and "make install" does not need to be run sudo.

     With he above configuration line, the PDK files will be installed into
     the path
 		/usr/share/pdks/sky130A/

 -------------------------------------------------------------------------------
 Detailed instructions for the patient reader:
 -------------------------------------------------------------------------------
 Prerequisites:

 1. EDA tools:

     For installing files to use with the Magic layout tool, Magic must be installed.
     Obtain Magic from:

 	https://github.com/RTimothyEdwards/magic

     No other tools are required for installation, although open_pdks will
     generate and install the setup files for a number of tools.

 2. Foundry source files [optional]:

     If you do not have the foundry source files, the latest version will
     be downloaded from github, built, and installed locally in the
     open_pdks/sources/ directory.  If you have the foundry source files,
     then you can pass the location to the open_pdks configure script.  In
     that case, the sources will need to be completely built.  The
     instructions below are needed ONLY if you intend to download and
     install the PDK sources outside of open_pdks.  Instructions below
     are only valid for the SkyWater SKY130 process.  If additional
     open-source PDKs become available, instructions will be added as
     needed.

     Obtain sources for the SkyWater sky130 130nm process from the git repository
     at the following location:

 	 https://github.com/google/skywater-pdk

     This repository may go in any convenient location.  The Makefile suggests
     the target location ~/projects/foundry/skywater-pdk but any location will
     do as long as the --enable-sky130-pdk= configuration option value is set
     appropriately.

     So cd to the target location parent directory (e.g., "cd ~/projects/foundry")
     and run the following command:

 	 git clone https://github.com/google/skywater-pdk

     Note that many of the files in the PDK are too large for a single git
     repository, and so each IP library in the PDK has been placed in a
     submodule.  There are multiple versions of each library, and it is
     nearly certain that you will only want to deal with the "latest" version
     of each.  To make sure you have the submodules for the latest version of
     each supported IP library, do:

 	cd skywater-pdk
 	git submodule init libraries/sky130_fd_io/latest
 	git submodule init libraries/sky130_fd_pr/latest
 	git submodule init libraries/sky130_fd_sc_hd/latest
 	git submodule init libraries/sky130_fd_sc_hvl/latest
 	[git submodule init libraries/sky130_fd_sc_hdll/latest]
 	[git submodule init libraries/sky130_fd_sc_hs/latest]
 	[git submodule init libraries/sky130_fd_sc_ms/latest]
 	[git submodule init libraries/sky130_fd_sc_ls/latest]
 	[git submodule init libraries/sky130_fd_sc_lp/latest]
 	git submodule update

     The liberty (.lib) files are the largest of all and so individual files
     are too large for the git repo and need to be assembled by script.  To
     do that, do:

 	make timing

     That installs all of the Google/Skywater files.  To keep the overhead low,
     you may initialize only the submodules that you need.  At a minimum, the
     I/O library, primitive devices, and the high density and high voltage
     digital standard cell libraries should be installed.  The remaining standard
     cell libraries are optional, as needed for low-leakage, high speed, low power,
     etc., applications.

     Then follow the instructions below for generating the additional files
     for supporting the open source EDA tool flows.

 PDK Installation:

     There are two methods for installation:  Local and Distribution.  Use Local
     installation if you are installing on a single host computer.  Use Distribution
     installation if you are installing into a respository (such as git) that will
     be distributed to multiple hosts.

 Step 1:

     Run "configure" to set the paths to the Google/SkyWater source
     repository and to set the path to the install location.  Note that
     the configure script is located in the open_pdks top level directory,
     not in the foundry subdirctory, and must be run from the top level
     directory.  The mandatory configure options are as follows:

 	--enable-sky130-pdk[=/path/to/sky130/pdk/source]

     See below for details.

     NOTE:  The intention of the configure file is to not have to hand-edit
     the Makefile.  However, the development of the configure script is
     currently ongoing and unfinished, so for now the Makefile should be
     checked and edited after running configure.

 	--enable-sky130-pdk[=/path/to/sky130/pdk/source]
 		This is mandatory for specifying that the installation
 		is for the SKY130 PDK.  If the path is specified, then
 		the PDK is assumed to already be downloaded and installed.
 		If not, then the PDK will be downloaded automatically
 		from github and installed.  Note that the PDK repository
 		is very large, contains submodules, and the submodules
 		need to compile the liberty timing files, which can
 		take a very long time.  Be patient.

 	--with-ef-style
 		Select this for an efabless-style file structure.
 		The default is "no".  There are some differences in
 		these two styles, the most important of which being
 		that the order of directories for the IP libraries
 		is <file_format>/<library_name> instead of
 		<library_name>/<file_format>. Other differences
 		include version tracking of the Magic setup files
 		and the location of the technology LEF file.

 	--with-sky130-link-targets=none|source
 		"none" copies files from the source directories to
 		the target.  "source" makes symbolic links to the source
 		directories.  Use "source" only if doing a local install,
 		and the source foundry data will not be deleted.  For
 		distribution installations, the value must be set to
 		"none".

 	--with-sky130-local-path=<path>
 		The path to the target install directory.  This is used
 		in both the local and distribution installations.  For
 		a distribution installation, this is the local name of
 		the path to the PDK after it has been distributed to
 		the host computers (This should have been set by the
 		option --with-local-path= passed to configure).  If not
 		specified, then the default <path> is /usr/share/pdks/,
 		so the PDK will be installed as /usr/share/pdks/sky130A/.

 	--with-sky130-dist-path=<path>
 		The path to the location of the installed files prior to
 		distribution.  This will most likely be a git or similar
 		repo.  This path should NOT be specified for a single-
 		machine installation.

 	--enable-alpha-sky130[=<path>]
 		The path to the sky130_ml_xx_hd library, a third-party
 		library containing layouts of alphanumeric characters
 		for adding text to layout.  If the configuration option
 		or the path is not specified, then the library will be
 		downloaded from github automatically.  To disable this
 		package, use "--disable-alpha-sky130".

 	--enable-xschem-sky130[=<path>]
 		The path to the SKY130 setup for the xschem schematic
 		entry/schematic capture tool.  If the configuration
 		option or the path is not specified, then the library
 		will be downloaded from github automatically.  To disable
 		this package, use "--disable-xschem-sky130".

 	--enable-sram-sky130[=<path>]
 		This 3rd party library contains pre-compiled and verified
 		memory blocks from the OpenRAM open source memory compiler.
 		It is disabled by default due to the length of time
 		required to install, but it is recommended if you will be
 		using SRAM in a design.

 	--enable-osu-sky130[=<path>]
 		This 3rd party library is a set of open-source digital
 		standard cells.

 	--enable-osu-t12-sky130[=<path>]
 		This 3rd party library is a set of open-source digital
 		standard cells at 12 track pitch height.

 	--enable-osu-t15-sky130[=<path>]
 		This 3rd party library is a set of open-source digital
 		standard cells at 15 track pitch height.

 	--enable-osu-t18-sky130[=<path>]
 		This 3rd party library is a set of open-source digital
 		standard cells at 18 track pitch height.

 Step 2:
 	Run:

 	    make

 	This will pre-process the setup files to create the PDK-specific files
 	for the SKY130A PDK, and process all vendor files, and place everything
 	in a local staging area.

 Step 3:
 	Run:

 	    make install

 	The behavior of installation depends on whether or not
 	--with-<pdk>-dist-path=<path> has been set (e.g.,
 	--with-sky130-dist-path).  If only the local path
 	(--with-<pdk>-local-path=<path>) has been set, then "make
 	install" copies all files from the staging area into the
 	destination.  All pointers to absolute paths in the files
 	are changed to match the local path.

 	If --with-<pdk>-dist-path=<path> has been set, then "make
 	install" copies all files from the staging area into the
 	destination as specified by the value of <path>.  All
 	pointers to absolute paths in the files are changed to match
 	the local path value.  The assumption is that the distribution
 	path is a repository (such as a git repo) that is cloned to
 	multiple hosts, and the destination on the hosts where it is
 	distributed is the local path.

 -------------------------------------------------------------------------------
 Summary of the installation directories:

     The Makefile script takes the source files and generates files for local
     PDK names "SKY130A", "SKY130B", etc.  (Note there is currently only one
     PDK variant "A".)

     The definition of each PDK is made in the Makefile using defines; e.g.,
 	-DMETAL5, etc.

     The make script makes use of the python script "preproc.py" (in the ../common
     directory) to parse each source file for "#ifdef ..."-type macros.  The syntax
     is similar to that used by the C preprocessor (cpp) but does not assume C
     language syntax in the input file, so is generally better to use than cpp
     (has less unexpected/unintentional behavior).  See comments in the preproc.py
     script for a full list of macros that it accepts (short list: #ifdef, #ifndef,
     #define, #include, and boolean operators ||, &&, and !).

     Files generated:
 	.tech		techfile for magic (full DRC, extract, GDS)
 	-GDS.tech	techfile for magic, vendor mask layers
 	.tcl		PDK script for magic
 	-BindKeys	key binding script for magic partly matching Cadence defaults
 	.magicrc	magic startup script (copy to local directory as .magicrc)
 	_setup.tcl	netgen setup script for LVS
 	.sh		qflow master setup script, standard 1.8V digital
 	.par		graywolf setup file, standard 1.8V digital

     The installation directory below LOCAL_PATH is the name of the PDK;  e.g.,

 	    sky130A/		5-metal stack with MiM cap and redistribution layer

     The installation directory hierarchy below the PDK name looks like the following:

 		libs.tech/		technology and setup files

 		    magic/		magic techfiles, startup file, PDK script,
 					and key binding script.
 		    netgen/		netgen setup file
 		    qflow/		qflow scripts and graywolf setup files.
 		    klayout/		setup files for klayout
 		    openlane/		setup and supplementary files for openlane
 		    ngspice/		base model files and libraries for ngspice
 		    xschem/		setup files for xschem
 		    irsim/		setup and parameter files for IRSIM

 		libs.ref/		foundry data

 		    cdl/		CDL netlists
 		    doc/		Foundry documentation
 		    gds/		GDS files
 		    lef/		LEF macro files
 		    lib/		Timing files
 		    mag/		Magic files derived from GDS
 		    maglef/		Magic files derived from LEF macros
 		    spice/		SPICE netlists (ngspice compatible)
 		    techlef/		LEF technology files
 		    verilog/		verilog modules

     Each subdirectory of libs.ref is further divided into sections based on the
     IP type.  The section names are largely foundry-dependent.  For SkyWater Sky130,
     these sections include one or more of:

 			sky130_fd_sc_hd/		1.8V digital logic (high density)
 			sky130_fd_sc_hdll/		1.8V digital logic (high density low leakage)
 			sky130_fd_sc_hs/		1.8V digital logic (high speed)
 			sky130_fd_sc_hvl/		3.3V digital logic
 			sky130_fd_sc_lp/		1.8V digital logic (low power)
 			sky130_fd_sc_ls/		1.8V digital logic (low speed)
 			sky130_fd_sc_ms/		3.3V digital logic (medium speed)

 			sky130_fd_io/			Standard I/O

 			sky130_fd_pr/			Primitive devices w/fixed layout

 			sky130_ml_xx_hd/		Library of alphanumeric layouts

     The target installation destinations assume the directory structure above.  Changing
     this requires editing the source files.
	------------------------------------
	open_pdks
	----------------------------------------
	Master PDK generator for SkyWater Sky130
	Hybrid 180nm / 130nm foundry process
	for open source EDA tools
	----------------------------------------

	-------------------------------------------------------------------------------
	Quick summary (TL;DR):

	Prerequisites:

	sudo apt-get install python3

	The Magic VLSI layout tool is used often by the installation. If you do
	not have it, then obtain it and install with the following:

	sudo apt-get install m4 tcsh tcl-dev tk-dev

	git clone https://github.com/RTimothyEdwards/magic
	cd magic
	./configure
	make
	sudo make install

	Open_PDKs SKY130 Installation: Most people will want to run the following
	for PDK installation:

	./configure --enable-sky130-pdk
	make
	sudo make install

	This will download and install the SkyWater SKY130 PDK, the SKY130 setup
	files for xschem, and a third-party library containing alphanumeric layouts.
	If you prefer an installation in your user space, then use configure option
	"--with-sky130-local-path=<path>" with <path> being some alternative like
	~/pdks, and "make install" does not need to be run sudo.

	With he above configuration line, the PDK files will be installed into
	the path
	/usr/share/pdks/sky130A/

	-------------------------------------------------------------------------------
	Detailed instructions for the patient reader:
	-------------------------------------------------------------------------------
	Prerequisites:

	1. EDA tools:

	For installing files to use with the Magic layout tool, Magic must be installed.
	Obtain Magic from:

	https://github.com/RTimothyEdwards/magic

	No other tools are required for installation, although open_pdks will
	generate and install the setup files for a number of tools.

	2. Foundry source files [optional]:

	If you do not have the foundry source files, the latest version will
	be downloaded from github, built, and installed locally in the
	open_pdks/sources/ directory. If you have the foundry source files,
	then you can pass the location to the open_pdks configure script. In
	that case, the sources will need to be completely built. The
	instructions below are needed ONLY if you intend to download and
	install the PDK sources outside of open_pdks. Instructions below
	are only valid for the SkyWater SKY130 process. If additional
	open-source PDKs become available, instructions will be added as
	needed.

	Obtain sources for the SkyWater sky130 130nm process from the git repository
	at the following location:

	https://github.com/google/skywater-pdk

	This repository may go in any convenient location. The Makefile suggests
	the target location ~/projects/foundry/skywater-pdk but any location will
	do as long as the --enable-sky130-pdk= configuration option value is set
	appropriately.

	So cd to the target location parent directory (e.g., "cd ~/projects/foundry")
	and run the following command:

	git clone https://github.com/google/skywater-pdk

	Note that many of the files in the PDK are too large for a single git
	repository, and so each IP library in the PDK has been placed in a
	submodule. There are multiple versions of each library, and it is
	nearly certain that you will only want to deal with the "latest" version
	of each. To make sure you have the submodules for the latest version of
	each supported IP library, do:

	cd skywater-pdk
	git submodule init libraries/sky130_fd_io/latest
	git submodule init libraries/sky130_fd_pr/latest
	git submodule init libraries/sky130_fd_sc_hd/latest
	git submodule init libraries/sky130_fd_sc_hvl/latest
	[git submodule init libraries/sky130_fd_sc_hdll/latest]
	[git submodule init libraries/sky130_fd_sc_hs/latest]
	[git submodule init libraries/sky130_fd_sc_ms/latest]
	[git submodule init libraries/sky130_fd_sc_ls/latest]
	[git submodule init libraries/sky130_fd_sc_lp/latest]
	git submodule update

	The liberty (.lib) files are the largest of all and so individual files
	are too large for the git repo and need to be assembled by script. To
	do that, do:

	make timing

	That installs all of the Google/Skywater files. To keep the overhead low,
	you may initialize only the submodules that you need. At a minimum, the
	I/O library, primitive devices, and the high density and high voltage
	digital standard cell libraries should be installed. The remaining standard
	cell libraries are optional, as needed for low-leakage, high speed, low power,
	etc., applications.

	Then follow the instructions below for generating the additional files
	for supporting the open source EDA tool flows.

	PDK Installation:

	There are two methods for installation: Local and Distribution. Use Local
	installation if you are installing on a single host computer. Use Distribution
	installation if you are installing into a respository (such as git) that will
	be distributed to multiple hosts.

	Step 1:

	Run "configure" to set the paths to the Google/SkyWater source
	repository and to set the path to the install location. Note that
	the configure script is located in the open_pdks top level directory,
	not in the foundry subdirctory, and must be run from the top level
	directory. The mandatory configure options are as follows:

	--enable-sky130-pdk[=/path/to/sky130/pdk/source]

	See below for details.

	NOTE: The intention of the configure file is to not have to hand-edit
	the Makefile. However, the development of the configure script is
	currently ongoing and unfinished, so for now the Makefile should be
	checked and edited after running configure.

	--enable-sky130-pdk[=/path/to/sky130/pdk/source]
	This is mandatory for specifying that the installation
	is for the SKY130 PDK. If the path is specified, then
	the PDK is assumed to already be downloaded and installed.
	If not, then the PDK will be downloaded automatically
	from github and installed. Note that the PDK repository
	is very large, contains submodules, and the submodules
	need to compile the liberty timing files, which can
	take a very long time. Be patient.

	--with-ef-style
	Select this for an efabless-style file structure.
	The default is "no". There are some differences in
	these two styles, the most important of which being
	that the order of directories for the IP libraries
	is <file_format>/<library_name> instead of
	<library_name>/<file_format>. Other differences
	include version tracking of the Magic setup files
	and the location of the technology LEF file.

	--with-sky130-link-targets=none\|source
	"none" copies files from the source directories to
	the target. "source" makes symbolic links to the source
	directories. Use "source" only if doing a local install,
	and the source foundry data will not be deleted. For
	distribution installations, the value must be set to
	"none".

	--with-sky130-local-path=<path>
	The path to the target install directory. This is used
	in both the local and distribution installations. For
	a distribution installation, this is the local name of
	the path to the PDK after it has been distributed to
	the host computers (This should have been set by the
	option --with-local-path= passed to configure). If not
	specified, then the default <path> is /usr/share/pdks/,
	so the PDK will be installed as /usr/share/pdks/sky130A/.

	--with-sky130-dist-path=<path>
	The path to the location of the installed files prior to
	distribution. This will most likely be a git or similar
	repo. This path should NOT be specified for a single-
	machine installation.

	--enable-alpha-sky130[=<path>]
	The path to the sky130_ml_xx_hd library, a third-party
	library containing layouts of alphanumeric characters
	for adding text to layout. If the configuration option
	or the path is not specified, then the library will be
	downloaded from github automatically. To disable this
	package, use "--disable-alpha-sky130".

	--enable-xschem-sky130[=<path>]
	The path to the SKY130 setup for the xschem schematic
	entry/schematic capture tool. If the configuration
	option or the path is not specified, then the library
	will be downloaded from github automatically. To disable
	this package, use "--disable-xschem-sky130".

	--enable-sram-sky130[=<path>]
	This 3rd party library contains pre-compiled and verified
	memory blocks from the OpenRAM open source memory compiler.
	It is disabled by default due to the length of time
	required to install, but it is recommended if you will be
	using SRAM in a design.

	--enable-osu-sky130[=<path>]
	This 3rd party library is a set of open-source digital
	standard cells.

	--enable-osu-t12-sky130[=<path>]
	This 3rd party library is a set of open-source digital
	standard cells at 12 track pitch height.

	--enable-osu-t15-sky130[=<path>]
	This 3rd party library is a set of open-source digital
	standard cells at 15 track pitch height.

	--enable-osu-t18-sky130[=<path>]
	This 3rd party library is a set of open-source digital
	standard cells at 18 track pitch height.

	Step 2:
	Run:

	make

	This will pre-process the setup files to create the PDK-specific files
	for the SKY130A PDK, and process all vendor files, and place everything
	in a local staging area.

	Step 3:
	Run:

	make install

	The behavior of installation depends on whether or not
	--with-<pdk>-dist-path=<path> has been set (e.g.,
	--with-sky130-dist-path). If only the local path
	(--with-<pdk>-local-path=<path>) has been set, then "make
	install" copies all files from the staging area into the
	destination. All pointers to absolute paths in the files
	are changed to match the local path.

	If --with-<pdk>-dist-path=<path> has been set, then "make
	install" copies all files from the staging area into the
	destination as specified by the value of <path>. All
	pointers to absolute paths in the files are changed to match
	the local path value. The assumption is that the distribution
	path is a repository (such as a git repo) that is cloned to
	multiple hosts, and the destination on the hosts where it is
	distributed is the local path.

	-------------------------------------------------------------------------------
	Summary of the installation directories:

	The Makefile script takes the source files and generates files for local
	PDK names "SKY130A", "SKY130B", etc. (Note there is currently only one
	PDK variant "A".)

	The definition of each PDK is made in the Makefile using defines; e.g.,
	-DMETAL5, etc.

	The make script makes use of the python script "preproc.py" (in the ../common
	directory) to parse each source file for "#ifdef ..."-type macros. The syntax
	is similar to that used by the C preprocessor (cpp) but does not assume C
	language syntax in the input file, so is generally better to use than cpp
	(has less unexpected/unintentional behavior). See comments in the preproc.py
	script for a full list of macros that it accepts (short list: #ifdef, #ifndef,
	#define, #include, and boolean operators \|\|, &&, and !).

	Files generated:
	.tech techfile for magic (full DRC, extract, GDS)
	-GDS.tech techfile for magic, vendor mask layers
	.tcl PDK script for magic
	-BindKeys key binding script for magic partly matching Cadence defaults
	.magicrc magic startup script (copy to local directory as .magicrc)
	_setup.tcl netgen setup script for LVS
	.sh qflow master setup script, standard 1.8V digital
	.par graywolf setup file, standard 1.8V digital

	The installation directory below LOCAL_PATH is the name of the PDK; e.g.,

	sky130A/ 5-metal stack with MiM cap and redistribution layer

	The installation directory hierarchy below the PDK name looks like the following:

	libs.tech/ technology and setup files

	magic/ magic techfiles, startup file, PDK script,
	and key binding script.
	netgen/ netgen setup file
	qflow/ qflow scripts and graywolf setup files.
	klayout/ setup files for klayout
	openlane/ setup and supplementary files for openlane
	ngspice/ base model files and libraries for ngspice
	xschem/ setup files for xschem
	irsim/ setup and parameter files for IRSIM

	libs.ref/ foundry data

	cdl/ CDL netlists
	doc/ Foundry documentation
	gds/ GDS files
	lef/ LEF macro files
	lib/ Timing files
	mag/ Magic files derived from GDS
	maglef/ Magic files derived from LEF macros
	spice/ SPICE netlists (ngspice compatible)
	techlef/ LEF technology files
	verilog/ verilog modules

	Each subdirectory of libs.ref is further divided into sections based on the
	IP type. The section names are largely foundry-dependent. For SkyWater Sky130,
	these sections include one or more of:

	sky130_fd_sc_hd/ 1.8V digital logic (high density)
	sky130_fd_sc_hdll/ 1.8V digital logic (high density low leakage)
	sky130_fd_sc_hs/ 1.8V digital logic (high speed)
	sky130_fd_sc_hvl/ 3.3V digital logic
	sky130_fd_sc_lp/ 1.8V digital logic (low power)
	sky130_fd_sc_ls/ 1.8V digital logic (low speed)
	sky130_fd_sc_ms/ 3.3V digital logic (medium speed)

	sky130_fd_io/ Standard I/O

	sky130_fd_pr/ Primitive devices w/fixed layout

	sky130_ml_xx_hd/ Library of alphanumeric layouts

	The target installation destinations assume the directory structure above. Changing
	this requires editing the source files.