Stats

  • Locked Locked
  • Replies 3
  • Subscribers 66
  • Views 1707
  • Members are here 0
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

SV:Where to use Continuous Assign?

Leo1008

 Hi,

I am not sure of the exact usage of continuous assignments. I want to know where should one use these and what is the difference between the three types of assingments viz. Continuous, blocking and non-blocking.

Also can continuous assignments be substituted by non-blocking assingments or vice versa??

 

Thanks

Insiya

Parents

  •  An excellent documentation on continous assignments, blocking and non-blocking usage is in this document.

    http://csg.csail.mit.edu/6.375/papers/cummings-nonblocking-snug99.pdf

    In terms of SV usage (from a testbench perspective) for all of them,  first of all SV makes a clear differentiation between verilog by not having always blocks. Second of all drives are always non-blocking to signals in the DUT. If you want to assign always to some value use initial forever. 

     On using continous assignments to be subsituted by non-blocking statements, it depends what you want to model sequential or combinational , if you want to model sequential use non-blocking statements if you want to model combinational use blocking or continous assignments.

    If you are modeling a bi-directional bus you  should always use continous assignments

Reply

  •  An excellent documentation on continous assignments, blocking and non-blocking usage is in this document.

    http://csg.csail.mit.edu/6.375/papers/cummings-nonblocking-snug99.pdf

    In terms of SV usage (from a testbench perspective) for all of them,  first of all SV makes a clear differentiation between verilog by not having always blocks. Second of all drives are always non-blocking to signals in the DUT. If you want to assign always to some value use initial forever. 

     On using continous assignments to be subsituted by non-blocking statements, it depends what you want to model sequential or combinational , if you want to model sequential use non-blocking statements if you want to model combinational use blocking or continous assignments.

    If you are modeling a bi-directional bus you  should always use continous assignments

Children
No Data

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.