Introduction
SpinalHDL will check that no signal assignement completly erase a previous one.
Example
The following code :
class TopLevel extends Component {
val a = UInt(8 bits)
a := 42
a := 66 //Erease the a := 42 :(
}
will throw :
ASSIGNMENT OVERLAP completely the previous one of (toplevel/a : UInt[8 bits])
***
Source file location of the a := 66 assignement via the stack trace
***
A fix could be :
class TopLevel extends Component {
val a = UInt(8 bits)
a := 42
when(something){
a := 66
}
}
But in the case you realy want to override the previous assignements (Yes, it could make sense in some cases), you can do as following :
class TopLevel extends Component {
val a = UInt(8 bits)
a := 42
a.allowOverride
a := 66
}