tree: c10d6a6f00f01f838c1a7e20afd91520b93023d5 [path history] [tgz]
  1. .travisCI/
  2. def/
  3. doc/
  4. gds/
  5. lef/
  6. macros/
  7. mag/
  8. maglef/
  9. ngspice/
  10. openlane/
  11. qflow/
  12. scripts/
  13. spi/
  14. utils/
  15. verilog/
  16. .travis.yml
  17. info.yaml
  18. LICENSE
  19. Makefile
  20. mpw-one-a.md
  21. README.md
README.md

Analog Spiking Neuron Circuit - Caravel Submission

This is the Google/EFabless/Skywater Caravel submission of an Analog Spiking Neuron Circuit. The submission also includes a SONOS transistor array.

Neuron circuit

The circuit in the original paper is in 130nm technology and has a vdd of 300mV. Skywater pdk is hybrid 180nm/130nm node where the minimum transistor length is 150nm. As a result vdd needs to be higher in order to get the circuit to work properly. In simulation 700mV seems to work well.

pinout

nodepadnodepad
i_biasmprj_io[13]v_buffmprj_io[22]
vadmprj_io[14]u_buffmprj_io[23]
vrmprj_io[15]a_buffmprj_io[24]
vkmprj_io[16]axon_buffmprj_io[25]
vthmprj_io[17]selmprj_io[26]
vwmprj_io[18]v_synmprj_io[27]
vaumprj_io[19]u_synmprj_io[28]
vsyn0mprj_io[20]a_synmprj_io[29]
vsyn1mprj_io[21]axon_synmprj_io[30]
i_inmprj_io[31]

extracted netlist simulation

Spiking pattern at v_buff for i_in = 10pA DC

SONOS array

A 2x2 array of nfet sonos cells with transistor sizing 420nmx150nm.

pinout

nodepad
WL0mprj_io[7]
WL1mprj_io[8]
BL0mprj_io[9]
SL0mprj_io[10]
BL1mprj_io[11]
SL1mprj_io[12]

Installation

To setup and install the repo for development:

  1. Install prerequisite tools:
    1. Install Magic VLSI Layout Tool
      • Note: As of 12/7/2020 you must install Magic from source code. The packaged version will not work with OpenPDKS.
    2. Install KLayout
    3. Install SkywaterPDK and OpenPDK using OpenLane
      1. Clone and Install OpenLane. This will also grab and install SkywaterPDK and OpenPDK for you.
export PDK_ROOT=(where pdks will be installed)

cd $PDK_ROOT

git clone https://github.com/efabless/openlane.git -b mpw-one-a

cd openlane
export OPENLANE_ROOT=$(pwd)
make

‚Äč 2. Clone and uncompress the repo

git clone https://github.com/Bryce-Readyhough/caravel_UNCC_MPW_1.git
make uncompress -j$nproc