signal <= (others => '0')

[Pasacco]

dear

It is for me unclear to understand differences between the following

signal &lt;= '00000000'; # assuming 8 bit signal
signal &lt;= (others =&gt; '0';
signal &lt;= (others =&gt; (others =&gt; '0'));

GIMY, but so far unsuccesful to find --:

Could anyone comment for this?
Thankyou in advance

 

[Pasacco]

clear

thankyou