sky130-hdl21 4.0.0rc0

SkyWater 130nm PDK Package for Hdl21

Sky130 Hdl21

Hdl21 PDK package for the open-source SkyWater 130nm PDK.
https://pypi.org/project/sky130-hdl21/

About This Technology

SkyWater 130nm is the first notable silicon PDK to be released as open-source software. The Sky130 effort is heavily community driven, with leadership from Google and eFabless.

Related Projects:

• skywater-pdk
• open_pdks
• the slack
• ... FIXME ...

About this PDK Package

sky130_hdl21 defines a set of hdl21.ExternalModules comprising the essential devices of the SkyWater 130nm open-source PDK, ' and an compile method for converting process-portable hdl21.Primitive elements into these modules.

Installation

Install from PyPi via:

pip install sky130-hdl21

And then import the package as sky130_hdl21:

import sky130_hdl21
assert sky130_hdl21.primitives is not None # etc

PDK Install Data

Silicon process technologies generally require non-Python data to execute simulations and other tasks. Sky130 is no different. Those files are not distributed as part of this package. The sky130 package defines an Hdl21 PdkInstallation type sky130.Install, which includes references to any such out-of-Python data, generally in the form of filesystem paths. See the Hdl21 PDK docs for more background.

A helpful resource for installing the non-Python portions of the 130nm PDK: https://anaconda.org/litex-hub/open_pdks.sky130a

Installable with conda via:

conda install -y -c litex-hub open_pdks.sky130a

Using the conda-based installation, a typical sitepdks module might look like:

CONDA_PREFIX = os.environ.get("CONDA_PREFIX")
model_lib = Path(CONDA_PREFIX) / "share/pdk/sky130A/libs.tech/ngspice/sky130.lib.spice"

import sky130_hdl21
sky130_hdl21.install = sky130_hdl21.Install(model_lib=model_lib)

Note the conda-based installation supports simulation solely with ngspice. Sky130 models compatible with Sandia Labs' Xyce have been generated by the community, but are less straightforward to find, install, and revision control.

List of Available Devices

It is important to emphasize that all PDK units are written in microns (μm). We recommend consulting the SKY130 Device Detail Documentation which can provide additional information on these additional components.

1. MOSFETs
2. Generic Resistors
3. Precision Resistors
4. Diodes
5. Bipolar Junction Transistors
6. Capacitors
7. Digital Cells

MOSFETs

MOSFETs can be defined using either width (W), length (L) and number of fingers (NF), the SKY130-HDL21 PDK module offers the following components, all with the junction terminals (d,g,s,b) with the exception of NMOS_ISO_20p0V

MOSFETs in Hdl21 are designed to be PDK-agnostic, making it possible select the desired MOS using either model compilation:

import sky130_hdl21
from hdl21.primitives import Mos, MosType, MosFamily, MosVth

a = Mos(vth=MosVth.STD,tp=MosType.NMOS,family=MosFamily.CORE)
sky130_hdl21.compile(a) # a is now an instance of sky130.primitives.NMOS_1p8V_STD

Or can be referenced directly using the component name listed below from the primitives submodule.

NOTE: If any dimensions are not supplied to the params object, the PDK module will assume the minimal viable dimension of the component that you choose.

from hdl21.prefix import µ
from sky130_hdl21_hdl21 import sky130MosParams as p
import sky130_hdl21.primitives as s

a = s.NMOS_1p8V_STD(p(w=0.2*µ,nf=1))

Component Key	MosType	MosVth	MosFamily	Component Name	Description
NMOS_1p8V_STD	NMOS	STD	CORE	sky130_fd_pr__nfet_01v8	Standard 1.8V NMOS transistor
NMOS_1p8V_LOW	NMOS	LOW	CORE	sky130_fd_pr__nfet_01v8_lvt	Low threshold 1.8V NMOS
PMOS_1p8V_STD	PMOS	STD	CORE	sky130_fd_pr__pfet_01v8	Standard 1.8V PMOS transistor
PMOS_1p8V_HIGH	PMOS	HIGH	CORE	sky130_fd_pr__pfet_01v8_hvt	High threshold 1.8V PMOS
PMOS_1p8V_LOW	PMOS	LOW	CORE	sky130_fd_pr__pfet_01v8_lvt	Low threshold 1.8V PMOS
PMOS_5p5V_D10_STD	PMOS	STD	IO	sky130_fd_pr__pfet_g5v0d10v5	Standard 5.5V PMOS with D10
NMOS_5p5V_D10_STD	NMOS	STD	IO	sky130_fd_pr__nfet_g5v0d10v5	Standard 5.5V NMOS with D10
PMOS_5p5V_D16_STD	PMOS	STD	IO	sky130_fd_pr__pfet_g5v0d16v0	Standard 5.5V PMOS with D16
NMOS_20p0V_STD	NMOS	STD	NONE	sky130_fd_pr__nfet_20v0	Standard 20V NMOS transistor
NMOS_20p0V_LOW	NMOS	ZERO	NONE	sky130_fd_pr__nfet_20v0_zvt	Zero threshold 20V NMOS
NMOS_ISO_20p0V	NMOS	STD	NONE	sky130_fd_pr__nfet_20v0_iso	5-Terminal Isolated 20V NMOS transistor with an extra terminal called "sub"
PMOS_20p0V	PMOS	STD	NONE	sky130_fd_pr__pfet_20v0	Standard 20V PMOS transistor
NMOS_3p3V_NAT	NMOS	NATIVE	NONE	sky130_fd_pr__nfet_03v3_nvt	Native 3.3V NMOS transistor
NMOS_5p0V_NAT	NMOS	NATIVE	NONE	sky130_fd_pr__nfet_05v0_nvt	Native 5.0V NMOS transistor
NMOS_20p0V_NAT	NMOS	NATIVE	NONE	sky130_fd_pr__nfet_20v0_nvt	Native 20V NMOS transistor
ESD_NMOS_1p8V	NMOS	STD	CORE	sky130_fd_pr__esd_nfet_01v8	Native ESD 1.8V NMOS, , standard Vth, core family
ESD_NMOS_5p5V_D10	NMOS	STD	IO	sky130_fd_pr__esd_nfet_g5v0d10v5	ESD NMOS, 5.5V, standard Vth, IO family, D10 variant
ESD_NMOS_5p5V_NAT	NMOS	NATIVE	IO	sky130_fd_pr__esd_nfet_g5v0d10v5_nvt	ESD NMOS, 5.5V, native Vth, IO family, D10 variant
ESD_PMOS_5p5V	PMOS	STD	IO	sky130_fd_pr__esd_pfet_g5v0d10v5	ESD PMOS, 5.5V, standard Vth, IO family

Generic Resistors

Generic resistors are resistors composed of materials used in the Sky130 process and can be defined using either width (W), length (L), 3-terminal resistors are formed of substrates and have an additional substrate terminal.

Generic esistors are not offered with PDK-agnostic compilation and so must be referred to directly with the correct paramtype:

from hdl21.prefix import µ
from sky130_hdl21_hdl21 import Sky130GenResParams as p
from sky130_hdl21_hdl21.primitives import GEN_PO

a = GEN_PO(p(l=0.3 * µ, w=0.18 * µ))

Component Key	Component Name	Number of Terminals	Description
GEN_PO	sky130_fd_pr__res_generic_po	2 (p,n)	Generic 2-terminal poly resistor
GEN_L1	sky130_fd_pr__res_generic_l1	2 (p,n)	Generic 2-terminal local-interconnect resistor
GEN_M1	sky130_fd_pr__res_generic_m1	2 (p,n)	Generic 2-terminal metal-1 resistor
GEN_M2	sky130_fd_pr__res_generic_m2	2 (p,n)	Generic 2-terminal metal-2 resistor
GEN_M3	sky130_fd_pr__res_generic_m3	2 (p,n)	Generic 2-terminal metal-3 resistor
GEN_M4	sky130_fd_pr__res_generic_m4	2 (p,n)	Generic 2-terminal metal-4 resistor
GEN_M5	sky130_fd_pr__res_generic_m5	2 (p,n)	Generic 2-terminal metal-5 resistor
GEN_ND	sky130_fd_pr__res_generic_nd	3 (p,n,b)	Generic 3-terminal N-diff resistor
GEN_PD	sky130_fd_pr__res_generic_pd	3 (p,n,b)	Generic 3-terminal P-diff resistor
GEN_ISO_PW	sky130_fd_pr__res_iso_pw	3 (p,n,b)	Generic 3-terminal isolated PW resistor

Precision Resistors

Precision resistors are made of polysilicon and have a fixed width in the SKY130 PDK, and can be defined in HDL only using the "L" parameter. All devices have junction terminals (p,n,b).

NOTE: UNITS ARE ASSUMED TO BE IN MICRONS FOR PRECISION RESISTORS

from hdl21.prefix import µ
from sky130_hdl21 import Sky130PrecResParams as p
from sky130_hdl21.primitives import GEN_PO

# NOTE: We assume the units are in microns here
a = GEN_PO(p(L=0.3))

Component Key	Component Name	Description
PP_PREC_0p35	sky130_fd_pr__res_high_po_0p35	Precision P+ 0.35μm resistor
PP_PREC_0p69	sky130_fd_pr__res_high_po_0p69	Precision P+ 0.69μm resistor
PP_PREC_1p41	sky130_fd_pr__res_high_po_1p41	Precision P+ 1.41μm resistor
PP_PREC_2p85	sky130_fd_pr__res_high_po_2p85	Precision P+ 2.85μm resistor
PP_PREC_5p73	sky130_fd_pr__res_high_po_5p73	Precision P+ 5.73μm resistor
PM_PREC_0p35	sky130_fd_pr__res_xhigh_po_0p35	Precision P- 0.35μm resistor
PM_PREC_0p69	sky130_fd_pr__res_xhigh_po_0p69	Precision P- 0.69μm resistor
PM_PREC_1p41	sky130_fd_pr__res_xhigh_po_1p41	Precision P- 1.41μm resistor
PM_PREC_2p85	sky130_fd_pr__res_xhigh_po_2p85	Precision P- 2.85μm resistor
PM_PREC_5p73	sky130_fd_pr__res_xhigh_po_5p73	Precision P- 5.73μm resistor

Diodes

Diodes in HDL21 are defined using width (W) and length (L) which are then converted into area and junction perimeter behind the scenes. All devices have junction terminals (p,n).

NOTE: DUE TO ANOTHER INTERESTING SCALING QUIRK, MEASUREMENTS FOR DIODES ARE MULTIPLIED BY 1e12 IN SKY130

from hdl21.prefix import MEGA, TERA
from sky130_hdl21 import Sky130DiodeParams as par
from sky130_hdl21.primitives import PWND_5p5V

a = PWND_5p5V(par(area=0.3 * TERA, pj=1.2 * MEGA))

Component Key	Component Name	Description
PWND_5p5V	sky130_fd_pr__diode_pw2nd_05v5	PW2ND diode, 5.5V
PWND_11p0V	sky130_fd_pr__diode_pw2nd_11v0	PW2ND diode, 11.0V
PWND_5p5V_NAT	sky130_fd_pr__diode_pw2nd_05v5_nvt	PW2ND diode, 5.5V, native VT
PWND_5p5V_LVT	sky130_fd_pr__diode_pw2nd_05v5_lvt	PW2ND diode, 5.5V, low VT
PDNW_5p5V	sky130_fd_pr__diode_pd2nw_05v5	PD2NW diode, 5.5V
PDNW_11p0V	sky130_fd_pr__diode_pd2nw_11v0	PD2NW diode, 11.0V
PDNW_5p5V_HVT	sky130_fd_pr__diode_pd2nw_05v5_hvt	PD2NW diode, 5.5V, high VT
PDNW_5p5V_LVT	sky130_fd_pr__diode_pd2nw_05v5_lvt	PD2NW diode, 5.5V, low VT
PX_RF_PSNW	sky130_fd_pr__model__parasitic__rf_diode_ps2nw	RF parasitic PS2NW diode
PX_RF_PWDN	sky130_fd_pr__model__parasitic__rf_diode_pw2dn	RF parasitic PW2DN diode
PX_PWDN	sky130_fd_pr__model__parasitic__diode_pw2dn	Parasitic PW2DN diode
PX_PSDN	sky130_fd_pr__model__parasitic__diode_ps2dn	Parasitic PS2DN diode
PX_PSNW	sky130_fd_pr__model__parasitic__diode_ps2nw	Parasitic PS2NW diode

Bipolar Junction Transistors

Bipolar Junction Transistors in the SKY130 PDK are defined as static devices and do not yet have parametric cells. As such, no parameters can be passed apart from "m" for parallel multiplicity of components:

from sky130_hdl21 import Sky130BipolarParams as par
from sky130_hdl21.primitives import NPN_5p0V_1x2

a = NPN_5p0V_1x2(par(m=2))

Component Key	Component Name	Number of Terminals	Description
NPN_5p0V_1x2	sky130_fd_pr__npn_05v5_W1p00L2p00	4 (c,b,e,s)	NPN BJT, 5.0V, 1x2μm
NPN_11p0V_1x1	sky130_fd_pr__npn_11v0_W1p00L1p00	4 (c,b,e,s)	NPN BJT, 11.0V, 1x1μm
NPN_5p0V_1x1	sky130_fd_pr__npn_05v5_W1p00L1p00	4 (c,b,e,s)	NPN BJT, 5.0V, 1x1μm
PNP_5p0V_0p68x0p68	sky130_fd_pr__pnp_05v5_W0p68L0p68	3 (c,b,e)	PNP BJT, 5.0V, 0.68x0.68μm
PNP_5p0V_3p40x3p40	sky130_fd_pr__pnp_05v5_W3p40L3p40	3 (c,b,e)	PNP BJT, 5.0V, 3.4x3.4μm

Capacitors

Capacitors in SKY130 come in 4 flavours, the MiM capacitor, the Varactor, the Vertical Parallel Plate transistor and the Vertical Perpendicular Plate capacitor, the latter two accept no arguments and their dimensions are fixed, whereas the first two allow their width and length to be defined:

MiM caps:

from hdl21.prefix import µ
from sky130_hdl21 import Sky130MimCapParams as par
from sky130_hdl21.primitives import MIM_M3

a = MIM_M3(w=2 * µ, l=2 * µ)

Varicaps:

from hdl21.prefix import µ
from sky130_hdl21 import Sky130VarCapParams as par
from sky130_hdl21.primitives import VAR_LVT

a = VAR_LVT(w=2 * µ, l=2 * µ)

Vertical-Perpendicular/Parallel Plates:

from sky130_hdl21 import Sky130VPPParams as par
from sky130_hdl21.primitives import VPP_PARA_5

a = VPP_PARA_5(m=1)

Component Key	Component Name	Number of Terminals	Capacitor Type	Description
MIM_M3	sky130_fd_pr__cap_mim_m3_1	2 (p,n)	MiM	MiM capacitor, M3 layer
MIM_M4	sky130_fd_pr__cap_mim_m3_2	2 (p,n)	MiM	MiM capacitor, M4 layer
VAR_LVT	sky130_fd_pr__cap_var_lvt	3 (p,n,b)	Varactor	Varactor, LVT variant
VAR_HVT	sky130_fd_pr__cap_var_hvt	3 (p,n,b)	Varactor	Varactor, HVT variant
VPP_PARA_1	sky130_fd_pr__cap_vpp_04p4x04p6_m1m2_noshield_o2	3	VPP (Parallel)	VPP parallel capacitor, 4.4x4.6 µm, M1M2
VPP_PARA_2	sky130_fd_pr__cap_vpp_02p4x04p6_m1m2_noshield	3 (p,n,b)	VPP (Parallel)	VPP parallel capacitor, 2.4x4.6 µm, M1M2
VPP_PARA_3	sky130_fd_pr__cap_vpp_08p6x07p8_m1m2_noshield	3 (p,n,b)	VPP (Parallel)	VPP parallel capacitor, 8.6x7.8 µm, M1M2
VPP_PARA_4	sky130_fd_pr__cap_vpp_04p4x04p6_m1m2_noshield	3 (p,n,b)	VPP (Parallel)	VPP parallel capacitor, 4.4x4.6 µm, M1M2
VPP_PARA_5	sky130_fd_pr__cap_vpp_11p5x11p7_m1m2_noshield	3 (p,n,b)	VPP (Parallel)	VPP parallel capacitor, 11.5x11.7 µm, M1M2
VPP_PARA_6	sky130_fd_pr__cap_vpp_44p7x23p1_pol1m1m2m3m4m5_noshield	3 (p,n,b)	VPP (Parallel)	VPP parallel capacitor, 44.7x23.1 µm, POL1M1M2M3M4M5
VPP_PARA_7	sky130_fd_pr__cap_vpp_02p7x06p1_m1m2m3m4_shieldl1_fingercap	3 (p,n,b)	VPP (Parallel)	VPP parallel capacitor, 2.7x6.1 µm, M1M2M3M4, shield L1, finger cap
VPP_PARA_8	sky130_fd_pr__cap_vpp_02p9x06p1_m1m2m3m4_shieldl1_fingercap2	3 (p,n,b)	VPP (Parallel)	VPP parallel capacitor, 2.9x6.1 µm, M1M2M3M4, shield L1, finger cap 2
VPP_PARA_9	sky130_fd_pr__cap_vpp_02p7x11p1_m1m2m3m4_shieldl1_fingercap	3 (p,n,b)	VPP (Parallel)	VPP parallel capacitor, 2.7x11.1 µm, M1M2M3M4, shield L1, finger cap
VPP_PARA_10	sky130_fd_pr__cap_vpp_02p7x21p1_m1m2m3m4_shieldl1_fingercap	3 (p,n,b)	VPP (Parallel)	VPP parallel capacitor, 2.7x21.1 µm, M1M2M3M4, shield L1, finger cap
VPP_PARA_11	sky130_fd_pr__cap_vpp_02p7x41p1_m1m2m3m4_shieldl1_fingercap	3 (p,n,b)	VPP (Parallel)	VPP parallel capacitor, 2.7x41.1 µm, M1M2M3M4, shield L1, finger cap
VPP_PERP_1	sky130_fd_pr__cap_vpp_11p5x11p7_l1m1m2m3m4_shieldm5	4 (p,n,t,b)	VPP (Perpendicular)	VPP perpendicular capacitor, 11.5x11.7 µm, L1M1M2M3M4, shield M5
VPP_PERP_2	sky130_fd_pr__cap_vpp_11p5x11p7_l1m1m2m3m4_shieldpom5	4 (p,n,t,b)	VPP (Perpendicular)	VPP perpendicular capacitor, 11.5x11.7 µm, L1M1M2M3M4, shield PoM5
VPP_PERP_3	sky130_fd_pr__cap_vpp_11p5x11p7_m1m2m3m4_shieldl1m5	4 (p,n,t,b)	VPP (Perpendicular)	VPP perpendicular capacitor, 11.5x11.7 µm, M1M2M3M4, shield L1M5
VPP_PERP_4	sky130_fd_pr__cap_vpp_04p4x04p6_m1m2m3_shieldl1m5_floatm4	4 (p,n,t,b)	VPP (Perpendicular)	VPP perpendicular capacitor, 4.4x4.6 µm, M1M2M3, shield L1M5, floating M4
VPP_PERP_5	sky130_fd_pr__cap_vpp_08p6x07p8_m1m2m3_shieldl1m5_floatm4	4 (p,n,t,b)	VPP (Perpendicular)	VPP perpendicular capacitor, 8.6x7.8 µm, M1M2M3, shield L1M5, floating M4
VPP_PERP_6	sky130_fd_pr__cap_vpp_11p5x11p7_m1m2m3_shieldl1m5_floatm4	4 (p,n,t,b)	VPP (Perpendicular)	VPP perpendicular capacitor, 11.5x11.7 µm, M1M2M3, shield L1M5, floating M4
VPP_PERP_7	sky130_fd_pr__cap_vpp_11p5x11p7_l1m1m2m3_shieldm4	4 (p,n,t,b)	VPP (Perpendicular)	VPP perpendicular capacitor, 11.5x11.7 µm, L1M1M2M3, shield M4
VPP_PERP_8	sky130_fd_pr__cap_vpp_06p8x06p1_l1m1m2m3_shieldpom4	4 (p,n,t,b)	VPP (Perpendicular)	VPP perpendicular capacitor, 6.8x6.1 µm, L1M1M2M3, shield PoM4
VPP_PERP_9	sky130_fd_pr__cap_vpp_06p8x06p1_m1m2m3_shieldl1m4	4 (p,n,t,b)	VPP (Perpendicular)	VPP perpendicular capacitor, 6.8x6.1 µm, M1M2M3, shield L1M4
VPP_PERP_10	sky130_fd_pr__cap_vpp_11p3x11p8_l1m1m2m3m4_shieldm5_nhvtop	4 (p,n,t,b)	VPP (Perpendicular)	VPP perpendicular capacitor, 11.3x11.8 µm, L1M1M2M3M4, shield M5, NHV top

Digital Cells

The full range of SKY130's Standard Cell Libraries also work with the Sky130 PDK, they are far too numerous to name here but excellent documentation is available at: https://diychip.org/sky130/ . We allow users to select from each of the libraries using the following import statements:

Library Name	Import Statement
sky130_fd_sc_hd	import sky130.digital_cells.high_density as hd
sky130_fd_sc_hdll	import sky130.digital_cells.low_leakage as hdll
sky130_fd_sc_hs	import sky130.digital_cells.high_speed as hs
sky130_fd_sc_hvl	import sky130.digital_cells.high_voltage as hvl
sky130_fd_sc_lp	import sky130.digital_cells.low_power as lp
sky130_fd_sc_ls	import sky130.digital_cells.low_speed as ls
sky130_fd_sc_ms	import sky130.digital_cells.medium_speed as ms

If you like to load all the digital simultaneously, you can also import the entire digital library by calling from sky130_hdl21.digital_cells import *, although - this can take a while.

Each component is reflects the naming in DIYChip's documentation as well as their ports, for example:

import sky130_hdl21.digital_cells.high_density as hd
from sky130_hdl21 import Sky130LogicParams as param
p = param()
simple_or = hd.or2_0(p)

Development

pip install -e ".[dev]"