Giter Club home page Giter Club logo

Comments (1)

diogratia avatar diogratia commented on June 3, 2024

Historical s'LAST_VALUE is not synthesis eligible. See IEEE Std 1076.6-2004 RTL Synthesis (withdrawn) 8. Syntax, 8.1, 8.14 Predefined language environment, 8.14.1 Predefined attributes, 8.14.1.3 Attributes whose prefix is a signal s. Also see 1. Overview, 1.4 Conventions "c) Syntax text that is struck-through (e.g., text) refers to syntax that shall not be supported."

8.14.1.3 Attributes whose prefix is a signal s

...
s'LAST_VALUE
...

The issue here appears to be a lack of graceful synthesis end for the presented syntax from the secondary design unit behavioral of UART_RX following the error message.

%: ghdl synth -fsynopsys -fexplicit uart_rx
uart_rx.vhdl:45:29:error: last_value attribute not allowed
    elsif DIN'event and DIN'last_value='1' and DIN = '0' then
                            ^

******************** GHDL Bug occurred ***************************
Please report this bug on https://github.com/ghdl/ghdl/issues
GHDL release: 5.0.0-dev (4.0.0.r14.gf845482a2) [Dunoon edition]
Compiled with GNAT Version: Community 2019 (20190517-83)
Target: x86_64-apple-darwin17.7.0
/Users/dio_gratia/Desktop/
Command line:
ghdl synth -fsynopsys -fexplicit uart_rx
Exception CONSTRAINT_ERROR raised
Exception information:
raised CONSTRAINT_ERROR : synth-vhdl_context.adb:420 access check failed
******************************************************************
%:

The error message itself appears valid.

from ghdl.

Related Issues (20)

Recommend Projects

  • React photo React

    A declarative, efficient, and flexible JavaScript library for building user interfaces.

  • Vue.js photo Vue.js

    🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.

  • Typescript photo Typescript

    TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

  • TensorFlow photo TensorFlow

    An Open Source Machine Learning Framework for Everyone

  • Django photo Django

    The Web framework for perfectionists with deadlines.

  • D3 photo D3

    Bring data to life with SVG, Canvas and HTML. 📊📈🎉

Recommend Topics

  • javascript

    JavaScript (JS) is a lightweight interpreted programming language with first-class functions.

  • web

    Some thing interesting about web. New door for the world.

  • server

    A server is a program made to process requests and deliver data to clients.

  • Machine learning

    Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.

  • Game

    Some thing interesting about game, make everyone happy.

Recommend Org

  • Facebook photo Facebook

    We are working to build community through open source technology. NB: members must have two-factor auth.

  • Microsoft photo Microsoft

    Open source projects and samples from Microsoft.

  • Google photo Google

    Google ❤️ Open Source for everyone.

  • D3 photo D3

    Data-Driven Documents codes.