arachne-pnr | Place and route tool for FPGAs

by YosysHQ C++ Version: Current License: MIT

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kandi X-RAY | arachne-pnr Summary

arachne-pnr is a C++ library typically used in Embedded System applications. arachne-pnr has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

Arachne-pnr implements the place and route step of the hardware compilation process for FPGAs. It accepts as input a technology-mapped netlist in BLIF format, as output by the Yosys [0] synthesis suite for example. It currently targets the Lattice Semiconductor iCE40 family of FPGAs [1]. Its output is a textual bitstream representation for assembly by the IceStorm [2] icepack command. The output of icepack is a binary bitstream which can be uploaded to a hardware device. Together, Yosys, arachne-pnr and IceStorm provide an fully open-source Verilog-to-bistream tool chain for iCE40 1K and 8K FPGA development.

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arachne-pnr has a low active ecosystem.

It has 383 star(s) with 69 fork(s). There are 60 watchers for this library.

It had no major release in the last 6 months.

There are 23 open issues and 48 have been closed. On average issues are closed in 106 days. There are 1 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of arachne-pnr is current.

Quality

arachne-pnr has 0 bugs and 0 code smells.

Security

arachne-pnr has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

arachne-pnr code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

arachne-pnr is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

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arachne-pnr releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

It has 230 lines of code, 5 functions and 2 files.

It has low code complexity. Code complexity directly impacts maintainability of the code.

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arachne-pnr Key Features

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arachne-pnr Examples and Code Snippets

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Community Discussions

Trending Discussions on arachne-pnr

iCE40 Ultra Plus 5k — how to set PLL (without propietary GUI tools) (continued)

Verilog - bitstream works on hardware but simulation doesn't compile

What are PIP alternative in arachne-pnr?

Understanding logic tile LC_5 bits

Arachne-pnr internal clk reference pin

QUESTION

iCE40 Ultra Plus 5k — how to set PLL (without propietary GUI tools) (continued)

Asked 2021-Jun-24 at 12:04

In this question, I was suggested to use the existing libraries in order to test a PLL for the iCE40 Ultra Plus 5k.

I bought the Icebreaker V1.0e board and it looks like this:

External 12 MHz oscilator is connected to the pin 35 (marked green) of the Lattice iCE40UP5k (package SG48).

Pin 35 has function: IOT_46b_G0, type: DPIO/GBIN0 and is located in bank: 0).

When I searched the library that I posted above, I found a nice primitive SB_PLL40_PAD on the page 98. This primitive's description precisely matches what was done on the Icebreaker V1.0e schematics. Here is the description:

Please observe that it matches with the pin description above! Now, I want to use this in my VHDL so for start I only wrote a VHDL wrapper for this primitive:

...

ANSWER

Answered 2021-Jun-24 at 12:04

It looks like I can't read. Lattice technology library mentions SB_PLL40_PAD:

and I used SB_PLL_40_PAD... So of course it could not work! Now it compiles!

So I have a start here in order to create a nice PLL example that is using pre-existing hardware inside FPGA!

Source https://stackoverflow.com/questions/68113130

QUESTION

Verilog - bitstream works on hardware but simulation doesn't compile

Asked 2021-May-07 at 13:12

I am using Verilog to set up FPGA so that it blinks an LED once per second. And this is one way to do it:

...

ANSWER

Answered 2021-May-07 at 13:12

As your error message states, it is illegal to make a procedural assignment to a wire. A procedural assignment is an assignment made inside an always block, for example. You declared o_led as a wire, but then you assigned to it in an always block. You should use a reg type inside an always block. Refer to IEEE Std 1800-2017, section 10.4 Procedural assignments.

Change:

Source https://stackoverflow.com/questions/67434552

QUESTION

What are PIP alternative in arachne-pnr?

Asked 2020-Jul-14 at 19:16

While going through the router.cc the file of arcahne-pnr, I am unable to understand, how are the programmable interconnect pins PIPs routed? Does it seem PLL is representing the PIPs in the code? Could somebody help to make me clear, what corresponds to PIP in arachne-pnr? Thanks

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ANSWER

Answered 2020-Jul-14 at 18:50

They are called switches in the chip database, although I think the router expands this to its own structure.

Certainly nothing to do with PLL (phased locked loops) which are a clocking primitive.

Source https://stackoverflow.com/questions/62893755

QUESTION

Understanding logic tile LC_5 bits

Asked 2020-Jul-13 at 10:52

i m new to yosys and arachne-pnr. Here is the snippet from .asc and .icebox_explain. I could not understand how the bits of LC_5 are derived from .logic_tile 1 11.

example.v

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ANSWER

Answered 2020-Jul-13 at 06:36

LC_5 isn't the LC_ bits directly, but the 16 LUT init bits followed by 4 flipflop config bits.

The mapping from these to LC_ bit index is another step, also described in http://www.clifford.at/icestorm/logic_tile.html right at the bottom.

Source https://stackoverflow.com/questions/62867617

QUESTION

Arachne-pnr internal clk reference pin

Asked 2020-Apr-07 at 11:31

I wanted to know the internal clk reference pin number to be added for arachne-pnr pcf file. I am synthesizing for Alchitry Cu Board having the iCE40 HX8k chip (supported by yosis and arachne). I couldnt understand the correlation between pin number in pcf file to pin of the chip...

If someone could give me an example pcf file for say a DFF (something using clock), I will figure out the remaining. I have searched for this in google but was unsuccessful.

I saw some reference on .gate... command but didn't understand whether it should be added to pcf file or some other file and compiled for clk output. If so, please give me that command example

Sorry, for the long question. Any help will be much appreciated.

Thanks, Bharat

...

ANSWER

Answered 2020-Apr-07 at 11:31

pin numbers in the PCF are the same as package pin numbers. ".gate" is in the BLIF file generated by the synthesis tool and not something you put in the PCF.

Also do note that arachne-pnr is now deprecated and largely unsupported, you should be using its successor nextpnr for open source place and route. Its handling of PCF issues should be better too.

Source https://stackoverflow.com/questions/60466025

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