this signal is connected to multiple drivers

[eng.geobar]

this signal is connected to multiple drivers.

I always get this message when I use a signal in to places in the process() , or in and out the process, or in the left or right of <=

How can I solve this problem?

 

[Marcel Majoor]

To address this 'problem' you should use some intermediate signals (unique for each process) and then combine them.
Example: two processes driving the same signal:

process(...)
begin
  ..
  signalout <= ...
end process

process(...)
begin
  ..
  signalout <= ...
end process

gives you this error.

Use the following instead:

signal signalout1: ..
signal signalout2: ..

process(...)
begin
  ..
  signalout1 <= ...
end process

process(...)
begin
  ..
  signalout2 <= ...
end process

signalout <= signalout1 or signalout2;     -- Use some selection (like 'or' 'and' 'select' 'if') to combine the individual process signals

For processes you could also combine the two processes into a single process, but this is not advised.

 

[eng.geobar]

thanx and I'll try this solution

 

[vipinlal]

avoid multi-driven signals..
hope that this helps you..
https://vhdlguru.blogspot.com/2010/03/synthesis-error-signal-is-connected-to.html