who can tell me "$sign" system task ?

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feel_on_on

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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?
 

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)
 

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

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

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