Yosys SymbiFlow Plugins

This repository contains plugins for Yosys developed as part of the SymbiFlow project.

List of plugins

1. Design introspection
2. FASM
3. Integrate inverters
4. Parameters
5. QuickLogic IOBs
6. QuickLogic QLF FPGAs
7. SDC
8. XDC

Summary

Design introspection plugin

Adds several commands that allow for collecting information about cells, nets, pins and ports in the design or a selection of objects. Additionally provides functions to convert selection on TCL lists.

Following commands are added with the plugin:

• get_cells
• get_nets
• get_pins
• get_ports
• get_count
• selection_to_tcl_list

FASM plugin

Writes out the design's fasm features based on the parameter annotations on a design cell.

The plugin adds the following command:

• write_fasm

Integrate inverters plugin

Implements a pass that integrates inverters into cells that have ports with the 'invertible_pin' attribute set.

The plugin adds the following command:

• integrateinv

Parameters plugin

Reads the specified parameter on a selected object.

The plugin adds the following command:

• getparam

QuickLogic IOB plugin

QuickLogic IOB plugin annotates IO buffer cells with information from IO placement constraints. Used during synthesis for QuickLogic EOS-S3 architecture.

The plugin adds the following command:

• quicklogic_iob

QuickLogic QLF FPGAs plugin

QuickLogic QLF plugin extends Yosys with synthesis support for qlf_k4n8 and qlf_k6n10 architectures.

The plugin adds the following command:

• synth_quicklogic
• ql_dsp

Detailed help on the supported command(s) can be obtained by running help <command_name> in Yosys.

SDC plugin

Reads Standard Delay Format (SDC) constraints, propagates these constraints across the design and writes out the complete SDC information.

The plugin adds the following commands:

• read_sdc
• write_sdc
• create_clock
• get_clocks
• propagate_clocks
• set_false_path
• set_max_delay
• set_clock_groups

XDC plugin

Reads Xilinx Design Constraints (XDC) files and annotates the specified cells parameters with properties such as:

• INTERNAL_VREF
• IOSTANDARD
• SLEW
• DRIVE
• IN_TERM
• LOC
• PACKAGE_PIN

The plugin adds the following commands:

• read_xdc
• get_iobanks
• set_property
• get_bank_tiles