newbie vhdl question on variable length of '1'

[Carson]

hi

is there a way (or function) in vhdl such that I can specify a
variable length of '1' easily?

Thanks,

Carson

 

[john Doef]

Carson a écrit :

hi

is there a way (or function) in vhdl such that I can specify a
variable length of '1' easily?

Hello,

your question is really confusing.
What do you mean by 'specify a variable length' ?
What do you mean by '1' ? The number one or a bit '1' ?

In VHDL, you must declare variables with their type.
eg:
variable v1 : std_logic; -- a variable containing one bit
variable v8 : std_logic_vector (7 downto 0); -- a variable
containing 8 bits.

JD.

 

[Mark McDougall]

is there a way (or function) in vhdl such that I can specify a
variable length of '1' easily?

Do you mean "0000...00001" ?

std_logic_vector(conv_unsigned(1,N))

or "1111....1111"?

std_logic_vector(conv_signed(-1,N))

Regards,
Mark

 

[Carson]

Hi Mark,

it works! Thanks!

Carson