ERROR: Index name XXX is not static.

[svip]

hi, i have a problem during the check synthesis using ISE 14

in the package i have

constant N_bit :natural :=10;
type vect is array (0 to N_channels-1) of std_logic_vector(N_bit -1 downto 0);


constant h_REAL :vect :=("1010100100","1100001111","1101110101","0000111100","0101011101","1101011100","1110100100","1110001100");


in the entity declaration i have

entity complex_fir_tap is


generic(
H_REAL1 : STD_LOGIC_VECTOR (N_bit-1 downto 0):=h_REAL(0);
H_IMAG1 : STD_LOGIC_VECTOR (N_bit-1 downto 0):=h_IMAG(0)
);

I FOUND THE FOLLOWING ERRORS

Index name h_REAL is not static.
Index name h_IMAG is not static.

 

[svip]

i solve the problem but i have a question

i have the following question.
I realized a distrubuited complex fir
the coefficient are defined in a package as follows:
....
type vect is array (0 to N_channels-1) of std_logic_vector(N_bit -1 downto 0);
constant h_REAL :vect :=("0000000001","1100001111","1101110101","0000111100","0101011101","1101011100","1110100100","1010100100");
constant h_IMAG :vect :=("1010110100","1101101111","0001110101","0011111101","0101011101","1101011100","0000100100","0000001100");
.....

this number are useb by the N taps and are passed as generic

entity complex_fir_tap is

generic(
constant H_REAL1 : STD_LOGIC_VECTOR (N_bit-1 downto 0);
constant H_IMAG1 : STD_LOGIC_VECTOR (N_bit-1 downto 0)
);
....

whe i synthesize and implement my design the ISE suite use DSP48 if i set the relative option to AUTO in the synthesis option.
Being the value constant why the DSP48 are used.
If i force in the synthesis options the tool to not use DSP48 it realize constant multipliers or normal multipliers