Overview
This article documents some of our findings while ramping up with the Efinix Efinity FPGA toolchain & IDE for their Trion architecture using a Trion T20 BGA256 Development Kit on Ubuntu Linux 18.04.
Efinix boasts a 4X Power-Performance-Area advantage over traditional FPGA technologies based on their Quantum core fabric technology and integrates hardened IP blocks that include an SDRAM controller and MIPI D-PHY.
One of the key drivers for our interest in the Efinix FPGA family is the range of device densities they offer utilizing the same Trion architecture and toolchain. The Trion T4 starts at ~4K LEs, and it ranges up to the recently announced T120. Range within a single family is important to us in order to deploy a common mission-critical networking platform that can address different applications, challenges, and price points.
Also notable is that Efinix is a relatively new, private company with various significant investors, and Xilinx is one of them.
Our first impression with Efinity and Trion is very favorable, and here's a summary of why:
- The IDE and tools look & run great on Ubuntu Linux 18.04.
- Lots of support for Python scripting and command line tool flow
- XML / ASCII based project & ouput files, which are great for understanding project & technology specifics and developing projects under revision control (e.g., Git)
- Programming a Trion project bitstream on their Dev Kit worked great on Ubuntu.
- Development board is captured in Altium
Note that since we're new to Trion and Efinity, it's likely we have some things wrong in this article. If so, please use the comment box at the bottom of this page to let us know.
Installation on Linux
On Ubuntu 18.04, we download and extract the Efinity toolchain:
$ cd /opt
$ tar xvjf efinity-2019.2.192-ubuntu-x64.tar.bz2
$ tree -d -L 2 /opt/efinity/2019.2/
.
├── arch
│ ├── pgm
│ └── timing_models
├── bin
├── debugger
│ ├── bin
│ ├── demo
│ ├── doc
│ └── rtl
├── doc
│ ├── fonts
│ └── images
├── lib
│ ├── plugins
│ ├── python3.5
│ ├── tcl8.6
│ └── tk8.6
├── pgm
│ ├── bin
│ ├── doc
│ └── log
├── project
│ ├── fir
│ ├── helloworld
│ ├── pt_demo
│ └── r4000
├── pt
│ ├── bin
│ ├── db
│ ├── doc
│ └── sim_models
├── scripts
│ └── __pycache__
├── sim_models
│ ├── maplib
│ ├── verilog
│ └── vhdl
└── tcl_packages
├── efinity
├── efx_map
└── tcllib
From their included readme:
arch/ : Architecture description files bin/ : Executable binaries for synthesis, place & route, etc. doc/ : Documentation lib/ : Dynamic libraries log/ : GUI output logs pgm/ : Programmer Python libraries project/ : Example projects pt/ : Interface Designer Python libraries scripts/ : Helper scripts for running different FPGA flows sim_models/ : Functional simulation models for Efinity primitives tcl_packages/ : Tcl library files, init scripts
What's included
The toolchain and Efinix website include the following:
- Synthesis, MAP, Place & Route, and Bitstream generation
- Interface Designer to constrain logic and assign interfaces
- Floorplan Editor
- Support for Synopsys Design Constraints (SDC)
- Static timing analysis
- A nice looking but basic code editor with syntax highlighting
- Programmer
- Tcl Command Console
- Example designs for their various parts
- Altium Schematic and Layout files for their Dev Kits
- Orcad schematic and footprint symbols
- User forum
What's not included
Trion seems to be missing an internal logic analyzer to debug logic in-system via JTAG. For us, this is notable.
Also, the Efinity toolchain does not bundle a Verilog simulator but instead recommends the following:
- Open Source Icarus Verilog (iVerilog)
- Cadence Incisive Enterprise Simulator
- Mentor's QuestaSim
By default, the Python simulation scripts assume the developer has iVerilog installed, so let's perform a basic install of iVerilog and GTKWave on our Ubuntu machine:
$ sudo apt install iverilog $ sudo apt install gtkwave
Launching and Using Efinity IDE
Let's launch the IDE from an X11 SSH shell into our Ubuntu machine (using XQuartz on macOS):
$ source /opt/efinity/2019.2/bin/setup.sh $ echo $EFINITY_HOME /opt/efinity/2019.2 $ efinity_sh.sh
The figure below shows the Efinity IDE and is taken from the Efinity Software User Guide:
The IDE is very clean and intuitive. Plus, support for working from the command line via Python scripts is provided. Therefore, we have the choice of either using the IDE or we can run the flow using efx_run.py (we show this below).
Trion T20
Efinix states that their Trion FPGAs have a power-performance-area advantage over traditional FPGAs. They tout their Quantum routing fabric technology, which is the core of the T20. They blend the routing fabric with memory and multiplier blocks and wrap it with various interfaces including LVDS, an SDRAM controller, and even a hardened, multi-lane MIPI D-PHY.
The T20 has the following features:
- ~20K Logic Elements
- Up to 16 global clocks
- 36 multipliers
- ~1Mb of embedded memory.
- The price for quantity one is ~$15 on Digi-key.
Trion T20 BGA256 Development Kit
We just received the T20 Dev Kit and we were so happy to discover that Efinix makes available the Altium design files for it including the PCB layout. For us, this makes it very easy to dig in and understand the board.
The T20 Dev Kit has the following features (pic shown below):
- 256 Mb SDR SDRAM (16Mx16)
- 32 Mb serial FLASH
- Differential I/O headers
- Lots of LEDs and single-ended GPIO posts
- USB to FTDI programming / JTAG support
- Clocks, switches, etc.
Example Project for T20 Dev Kit
Below we show parts of the toolchain flow using an Efinix provided design example: "Trion T20 Double Data Input/Output (ddio.xml)". This is a simple project that shows the use of their integrated PLL and DDR I/O.
Let's first use the command line to run the flow of synthesis, place & route, and bitstream generation:
$ efx_run.py ddio.xml --flow compile Running: efx_run_map.py ddio --family Trion --device T20F256 -v ddio_top.v,t:verilog_2k --output_dir outflow --opt root=ddio_top --opt veri_options=verilog_mode=verilog_2k,vhdl_mode=vhdl_2008 work-dir=work_syn write_efx_verilog=on syn_options=mode=speed map : PASS Running: efx_run_pt.py ddio Trion T20F256 interface : PASS Running: efx_run_pnr.py ddio --prj --family Trion --device T20F256 --timing_model C4 --sim --output_dir outflow --opt sdc_file=ddio.sdc --opt work_dir=work_pnr pnr : PASS Running: efx_run_pgm.py ddio --family Trion --device T20F256 --output_dir outflow --opt mode=active width=1 enable_roms=on spi_low_power_mode=on io_weak_pullup=on oscillator_clock_divider=DIV8 enable_crc_check=off pgm : PASS
Let's return to the IDE and take a look at the Efinity Interface Designer for the PLL configuration. We can use this tool to change our I/O & configuration and write our changes out to a constraints file.
The picture below is from our lab bench probing two GPIO header posts on the Trion T20 Dev Kit when working with their DDR example project.
The scope screenshot below is the result of probing the 150 MHz PLL output (lower probe, yellow trace) and the DDR output.
Under the hood
Below we show some snippets of the console output when compiling the example project within the IDE.
[EFX-0000 INFO] Efinix FPGA Synthesis. [EFX-0000 INFO] Version: 2019.2.192 [EFX-0000 INFO] Compiled: Aug 21 2019. [EFX-0000 INFO] [EFX-0000 INFO] Copyright (C) 2013 - 2019 Efinix Inc. All rights reserved.
Efinix FPGA Placement and Routing. Version: 2019.2.192 Compiled: Aug 21 2019. Copyright (C) 2013 - 2019 Efinix Inc. All rights reserved. The Tool Is Based on VPR of University of Toronto, a free open source code under MIT license.
Next, let's start with a fresh example project and compile it using the command line while examining the outputs and folder structure:
$ source /opt/efinity/2019.2/bin/setup.sh
$ efx_run.py --help
usage: efx_run.py [-h] [--prj]
[-f {map,interface,pnr,pgm,compile,program,rtlsim,mapsim,pnrsim,full}]
[--family FAMILY] [-d DEVICE] [--timing_model TIMING_MODEL]
[-v EXTRA_FILES [EXTRA_FILES ...] | --flist FLIST]
[--tb TB_EXTRA_FILES] [--tb_top TB_TOP] [--dir SOURCE_DIR]
[--map_opts MAP_OPTS [MAP_OPTS ...]]
[--pnr_opts VPR_OPTS [VPR_OPTS ...]]
[--pgm_opts PGM_OPTS [PGM_OPTS ...]] [-m] [--ncsim]
[--map_compare] [--sim_if] [--output_dir OUTPUT_DIR]
[--work_dir WORK_DIR] [--cleanup_work_dir CLEANUP_WORK_DIR]
design
...
# Unfortunately, efx_run.py doesn't seem to have a verbose flag.
$ cd ~/Projects/efinix/ddio-t20-2018.4-v1.0
$ tree
.
├── abc.history
├── ddio.peri.xml
├── ddio.sdc
├── ddio_top.v
├── ddio.vdb
├── ddio.xml
├── outflow
│ ├── ddio.err.log
│ ├── ddio.hex
│ ├── ddio.info.log
│ ├── ddio.interface.csv
│ ├── ddio.interface.io
│ ├── ddio.lpf
│ ├── ddio.map.out
│ ├── ddio.map.rpt
│ ├── ddio.map.rpt.xml
│ ├── ddio.map.v
│ ├── ddio.pgm.out
│ ├── ddio.pinout.csv
│ ├── ddio.place
│ ├── ddio.place.out
│ ├── ddio.place.rpt
│ ├── ddio.pt.rpt
│ ├── ddio.pt.sdc
│ ├── ddio.pt_timing.rpt
│ ├── ddio.qplace
│ ├── ddio.route
│ ├── ddio.route.out
│ ├── ddio.route.rpt
│ ├── ddio.route.rpt.xml
│ ├── ddio_template.v
│ ├── ddio.timing.rpt
│ └── ddio.warn.log
├── profile_groups.txt
├── tcl_stacktrace.txt
├── work_pnr
│ ├── ddio.io_place
│ ├── ddio.lbf
│ ├── ddio.net_proto
│ ├── ddio.prevpr.vdb
│ ├── ddio.qchip
│ ├── ddio.qlib
│ ├── ddio.qnet
│ ├── run_efx_pgm.sh
│ └── run_efx_pnr.sh
└── work_syn
└── run_efx_map.sh
The folder structure shown above is our starting point when unzipping the example project archive. Evidently the example project ships already built. It would be nice here to have the ability to clean the project and get rid of all intermediate files.
Let's work to recompile the project step-by-step:
# synthesize / map $ efx_run.py ddio.xml --flow map Running: efx_run_map.py ddio --family Trion --device T20F256 -v ddio_top.v --output_dir outflow --opt root=ddio_top --opt work-dir=work_syn write_efx_verilog=on syn_options=mode=speed map : PASS # place and route $ efx_run.py ddio.xml --flow pnr Running: efx_run_pnr.py ddio --prj --family Trion --device T20F256 --timing_model C4 --sim --output_dir outflow --opt sdc_file=ddio.sdc --opt work_dir=work_pnr pnr : PASS # create a bitstream hex file $ efx_run.py ddio.xml --flow pgm Running: efx_run_pgm.py ddio --family Trion --device T20F256 --output_dir outflow --opt mode=active width=1 enable_roms=on spi_low_power_mode=on io_weak_pullup=on oscillator_clock_divider=DIV8 enable_crc_check=off pgm : PASS
Let's take a look at what other scripts are available to us:
$ cd /opt/efinity/2019.2/scripts/ $ ls *.py efinity_pgm_tk.py efx_run_map.py efx_run_pnr.py efx_run.py qp_vpr_sdc_verification.py efx_generate_if_files.py efx_run_pgm.py efx_run_pt.py efx_run_sim.py
From using the tools and peeking inside the scripts, it appears that efx_run.py calls the other scripts depending on the task / flow required.
Suggestions for Improvement
- An internal logic analyzer similar to Intel's SignalTap and Lattice's Reveal is needed, and we understand that debug features are coming to the toolchain.
- Enhance the Code Editor to include auto formating, printing, and linting
- Add a project clean as an option under Menu -> FLow
Next Steps
We're just getting started with Trion & Efinity and we plan to periodically update and expand this article as we learn and do more with this exciting new FPGA family.
Some of our next steps include simulating primitives, configuration of IP, and evaluating time to compile a complex design.
We're also investigating a port of Private Island ® to Trion utilizing RGMII PHYs.
Date: Oct. 26, 2022
Author: Abeesh M P
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