nextpnr | nextpnr portable FPGA place and route tool

by YosysHQ C++ Version: nextpnr-0.6 License: ISC

X-Ray Key Features Code Snippets Community Discussions(2)Vulnerabilities Install Support

kandi X-RAY | nextpnr Summary

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

For iCE40 support, install [Project IceStorm] to /usr/local or another location, which should be passed as -DICESTORM_INSTALL_PREFIX=/usr to CMake. Then build and install nextpnr-ice40 using the following commands:.

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nextpnr has a medium active ecosystem.

It has 1063 star(s) with 211 fork(s). There are 67 watchers for this library.

It had no major release in the last 12 months.

There are 97 open issues and 258 have been closed. On average issues are closed in 81 days. There are 13 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of nextpnr is nextpnr-0.6

Quality

nextpnr has 0 bugs and 0 code smells.

Security

nextpnr has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

nextpnr code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

nextpnr is licensed under the ISC License. This license is Permissive.

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

Reuse

nextpnr releases are available to install and integrate.

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

It has 18184 lines of code, 1280 functions and 126 files.

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

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nextpnr Key Features

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nextpnr Examples and Code Snippets

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Community Discussions

Trending Discussions on nextpnr

ice40 clock delay, output timing analysis

Verilog module parameters in seperate config file?

QUESTION

ice40 clock delay, output timing analysis

Asked 2020-Jul-18 at 08:36

I have an ice40 that drives the clock and data inputs of an ASIC.

The ice40 drives the ASIC's clock with the same clock that drives the ice40's internal logic. The problem is that the rising clock triggers the ice40's internal logic and changes the ice40's data outputs a few nanoseconds before the rising clock reaches the ASIC, and therefore the ASIC observes the wrong data at its rising clock.

I've solved this issue by using an inverter chain to delay the ice40's internal clock without delaying the clock driving the ASIC. That way, the rising clock reaches the ASIC before the ice40's data outputs change. But that raises a few questions:

Is my strategy -- using an inverter chain to delay the ice40 internal clock -- a good strategy?
To diagnose the problem, I used Lattice's iCEcube2 to analyze the min/max delays between the internal clock and output pins:

Notice that the asic_dataX delays are shorter than the clk_out delay, indicating the problem.

Is there a way to get this information from yosys/nextpnr?

Thank you for any insight!

...

ANSWER

Answered 2020-Jul-18 at 08:36

Instead of tinkering with the delays I would recommend to use established techniques. For example SPI simple clocks the data on the one edge and changes them on the other: .

The logic to implement that is rather simple. Here an example implementation for an SPI slave:

Source https://stackoverflow.com/questions/62905634

QUESTION

Verilog module parameters in seperate config file?

Asked 2020-Jan-18 at 09:04

The Lattice FPGA I am using has embedded RAMs, which can be preloaded with data through the configuration binary.

The predefined Verilog modules for these RAMs implement this by providing Parameters named INIT_0 , INIT_1 , INIT_2 , ... , each a 256-bit value, to do this.

So my code to instantiate the RAM looks like this:

...

ANSWER

Answered 2020-Jan-17 at 14:38

I had a similar issue with using TSMC memories. TSMC has an "INIT" parameter/`define where you can set a text file to read in the verilog hex values. The issue was, I had multiple memories, so I would need multiple files, with multiple parameters on each instance of the memory (but I was trying to keep the code clean with an index of memories based on a parameter). This however was easier said than done, and also with the `define it would require a re-compile during regressions.

So what I did was create a Python script that would read in my disassembled code (or whatever data you want to read) and constructed assign statements that get executed right after time 0 (to account for the memory init). This file would be created as part of my make flow for CPU SW, so it was always up to date. I opted for this as we already had some scripts that were generating other portions for design and testing, and we just needed a way to force memory contents during quick debug testing instead of waiting for the memories to be programmed.

Source https://stackoverflow.com/questions/59786569

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install nextpnr

You can download it from GitHub.

Support

[Project IceStorm (Lattice iCE40)](http://bygone.clairexen.net/icestorm/). [Project Trellis (Lattice ECP5)](https://yosyshq.github.io/prjtrellis-db/). [Project X-Ray (Xilinx 7-Series)](https://symbiflow.github.io/prjxray-db/). [Project Chibi (Intel MAX-V)](https://github.com/rqou/project-chibi).

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