How to change the fractional point between two sfixed numbers in VHDL

[brou]

Hi all,

I want to convert an sfixed number(0111.0) to another sfixed (01.110). Do you propose a faster implementation than this?

I tried to do:

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Code VHDL - [expand]
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signal a : sfixed(3 downto -1);
signal b : sfixed(1 downto -3);
 
a <=  to_sfixed (7.0, a);      -- a = "01110" = 7
b <= a;                        -- b = "01110"= 1.75

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but the synthesis tool implements this in low frequency.

Thanks!