who can tell me "$sign" system task ?

[feel_on_on]

what's it's meaning ?

$sign(x) ,unsign(x).

I never have found the system task in my verilog book.

Is it a newer IEEE verilog standard syntax?

 

[stevepre]

verilog 2001.

for example, if you have a 4 bit value, lt's say, x=1111 (in binary)
if you use $signed(x), it will be -1
if you use $unsigned(x), it will be f in hex (15 in decimal)

 

[feel_on_on]

Thanks ,where can I find a IEEE verilog 2001 standard?

 

[sumit_techkgp]

Wanna add something, these two tasks are synthesizable and very handy to use especially when u design DSP