This repository contains eFuse array with Wishbone interface compiler for GF180 Open MPW. Was used in Ophelia FPGA taped out on GFMPW-0.

Compiler uses small eFuse memory PCell for KLayout and generates eFuse array with Wishbone read/write interface using GHDL, Yosys and OpenLane. Compiler is semi-automatic for now and requires some manual work to generate and characterize required array geometry.

• docs - Hopefully one day documentation will reside here
• hdl - VHDL sources for Wishbone array wrapper, behavioral models and testbenches
• macros - Output from KLayout goes here to be used during OpenLane step
• openlane - OpenLane scripts to generate Wishbone array wrapper macro
• klayout - KLayout eFuse PCells
• scripts - Useful scripts used during implementation & characterization
• xyce - Some (very unrefined) Xyce analog simulation tests for eFuse array components

To generate eFuse array following tools are required: KLayout, OpenLane, GHDL plugin for Yosys. For analog simulation Xyce simulator is required. Hopefully this repository will be expanded with more instructions and automated scripts in the future.

• Increase wire width and number of vias on critical nets.
• Add buffers to most of the pins.
• Add capacitors to mitigate IR drop and endcaps to sensamp cell line.
• Add WB register to configure PROG, PRECHARGE and SENSE signal duration.

eFuse block 8x4 bits generated from PCell.

9 kBit eFuse array with Wishbone compiled from 72 16x8 eFuse blocks for GFMPW-0 (OpenROAD density view).