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[QUOTE="Tricky, post: 4066081"]
Im having trouble getting the syntax correct for defining this
constant in modelsim. basically Ive got a 3x3 2-D array of sfixed.I
get the feeling Im not indexing the 2d array correctly. The errors I
get are:

# ** Warning: ./Testbenches/AWEP_filter_TB.vhd(48): (vcom-1172)
Aggregate element expression (function call "to_sfixed") is not of
type sub-array #2 of work.awep_setup_package.coeff_array_t.
# ** Error: ./Testbenches/AWEP_filter_TB.vhd(48): No feasible entries
for subprogram "to_sfixed".
# ** Error: ./Testbenches/AWEP_filter_TB.vhd(48): Aggregate expression
cannot be scalar type std.standard.integer.

Could I get some help?

subtype coeff_t       is sfixed(1  downto -16);
type coeff_array_t is array(-1 to 1, -1 to 1) of coeff_t;

-- x  y     --top row
    FILTER_COEFFS             : coeff_array_t := ( (-1,-1) =>
to_sfixed(0.0, coeff_t'high+1, abs(coeff_t'low) ) ,
                                                   ( 0,-1) =>
to_sfixed(0.0, coeff_t'high+1, abs(coeff_t'low) ) ,
                                                   ( 1,-1) =>
to_sfixed(0.0, coeff_t'high+1, abs(coeff_t'low) ) ,

--middle
row
                                                   (-1, 0) =>
to_sfixed(0.0, coeff_t'high+1, abs(coeff_t'low) ) ,
                                                   ( 0, 0) =>
to_sfixed(1.0, coeff_t'high+1, abs(coeff_t'low) ) ,
                                                   ( 1, 0) =>
to_sfixed(0.0, coeff_t'high+1, abs(coeff_t'low) ) ,

--bottom
row
                                                   (-1, 1) =>
to_sfixed(0.0, coeff_t'high+1, abs(coeff_t'low) ) ,
                                                   ( 0, 1) =>
to_sfixed(0.0, coeff_t'high+1, abs(coeff_t'low) ) ,
                                                   ( 1, 1) =>
to_sfixed(0.0, coeff_t'high+1, abs(coeff_t'low) )
                                                 );
[/QUOTE]

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