difference of variable and signal

[YiQi]

What's the different between variable and signal?

variable
signal
assignment operator: :=
<=
share between process: key word"shared"
yes

what else?

 

[Ralf Hildebrandt]

YiQi wrote:

What's the different between variable and signal?

As _every_ VHDL book will tell you: Variables are updated immediately
and signals are updated in the next delta delay.

Ralf