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kikibillel52
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Registered: ‎08-13-2019

failed to evaluate call to operator &

Hallo everyone,
i need to shift a signal " mantissa_D" with a value, this value "D_shift" is the different between exponent of two floating point number (Q, D). Unfortunately, i got an error "failed to evaluate call to operator &  
, because "D_shift" is declared as a variable (it is not possible to declare it as constant).  here is what i did:

variable mantissa_Q: unsigned (23 downto 0);
variable mantissa_D: unsigned (23 downto 0);
variable zeros : unsigned (23 downto 0);
variable D_shift: integer;
variable Q_shift: integer;

D_shift:= (exp_Q - exp_D);
mantissa_D := unsigned (zeros (23 downto 23 - D_shift+1)) & mantissa_D(23 downto D_shift);
can someone help me to solve this issue?
Thanks in advance.
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