how to convert vhdl binary coding to hex code??

Question

ai guys...

i'm new here... n i have a problem n need ur helps...

i already write my vhdl binary code but i don't know how to convert it to hex code...

my supervisor wants me to change my certain binary value into hex value...but i dont know what to add

so that i can use hex value in my coding.. i really need ur help...

thanks....

altera_forum · Answer

There's a few ways you can do this.

1) If your signal is a multiple of 4-bits, then you can use X to indicate hex.

signal d : std_logic_vector(15 downto 0) := X"1234";

2) If your signal is a mixture, you can use a concatenate operator, eg., to set 18-bits to 12345h, you could use

signal d : std_logic_vector(17 downto 0) := "01" & X"2345";

3) Using VHDL-2008 you can use a width specifier

signal d : std_logic_vector(17 downto 0) := 18X"12345";

You can also use conversion functions, eg., to convert an integer value in hex format 16#12345# to std_logic_vector.

Cheers,

Dave

edit - fixed the bus widths for you...

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