-
-
Save lethalbit/e65e296bc6a3810280d1b256c9df591b to your computer and use it in GitHub Desktop.
nmigen -> openlane example
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
from nmigen.build import * | |
from nmigen.vendor.open_lane import * | |
class sky130_fd_sc_hd(OpenLANEPlatform): | |
openlane_root = environ['OPENLANE_ROOT'] | |
pdk = "sky130A" | |
cell_library = "sky130_fd_sc_hd" | |
settings = { | |
"PL_TARGET_DENSITY": 0.75, | |
"FP_HORIZONTAL_HALO": 6, | |
"FP_VERTICAL_HALO": 6, | |
"FP_CORE_UTIL": 5, | |
} | |
connectors = [] | |
resources = [] | |
class inv(Elaboratable): | |
def __init__(self, width=8): | |
self.i = Signal(width) | |
self.o = Signal(width) | |
def elaborate(self, platform): | |
m = Module() | |
m.d.comb += self.o.eq(~self.i) | |
return m | |
def get_ports(self): | |
return [self.i, self.o] | |
if __name__ == "__main__": | |
platform = sky130_fd_sc_hd() | |
inverter = inv() | |
platform.build(inverter, name="inverter", ports=inverter.get_ports()) |
awesome! will give it a try soon. since it emits verilog, why doesn't synchronous logic work? looks like the create_missing_domain
needs to be fleshed out with a proper por and oscillator?
Like I said, it's a huge WIP, It needs a lot of work on some things and there is a lot of things that need to be considered, so it's not quite as simple as just throwing a POR and OSC in it.
Anyway, this discussion should be moved away from this gist and over to the fork.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
You'll be happy to know that I now have a fork of nmigen with the openlane changes in it on my github, https://github.com/lethalbit/nmigen/tree/openlane and there is an example in tree over at https://github.com/lethalbit/nmigen/blob/openlane/examples/vendor/openlane_asic.py
The process of using it is 500% undocumented at the moment but that's on my todo list