[SOLVED] how to convert fixed points to the nearest std_logic_vector?

[JKR1]

hi
is there any function for converting fixed point numbers (for example (7 downto -8)) to the nearest std_logic_vector(7 downto 0)?
if yes which packages and libraries shoulld be added?
thanks

 

[TrickyDicky]

what do you mean by "nearest" std_logic_vector?

whats wrong with just:
my_slv <= to_slv( my_ufxied(7 downto 0) );

 

[JKR1]

thanks for answering,
I want to convert the number 119.7(ufixed(7 downto -8)) to 119(std_logic_vectror(7 downto 0)).
I meant rounding the numbers by nearest .

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this error happens when I use

my_slv <= to_slv( my_ufxied(7 downto 0) );

** Error: C:\modeltech_6.5c\examples\main1.vhd(83): Target type ieee.NUMERIC_STD.UNSIGNED in variable assignment is different from expression type ieee.std_logic_1164.STD_ULOGIC_VECTOR.

 

[TrickyDicky]

sounds like you declared the my_slv as an unsigned and not a std_logic_vector
for this, you need:

my_us <= unsigned( my_ufixed(7 downto 0) );

 

[ads-ee]

thanks for answering,
I want to convert the number 119.7(ufixed(7 downto -8)) to 119(std_logic_vectror(7 downto 0)).
I meant rounding the numbers by nearest .

Then you mean you want to convert from 119.7 to 120? you're example shows 119.7 to 119, which is truncation not rounding.

If you want to round (don't know if there is a function or package for it) compare ufixed(-1)='1' and add a 1 to the truncated value.

 

[bking]

thanks for answering,
I want to convert the number 119.7(ufixed(7 downto -8)) to 119(std_logic_vectror(7 downto 0)).
I meant rounding the numbers by nearest .

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this error happens when I use

my_slv <= to_slv( my_[B]ufxied[/B](7 downto 0) );

It looks like you copied the typo verbatim...

it should be 'ufixed', not 'ufxied'