vhdl - Error: indexed name is not a integer -

i got error when synthesized project. have error in line:

axi_rdata <= patterncount(axi_awaddr(addr_lsb+opt_mem_addr_bits downto addr_lsb));

and got error:

[synth 8-2234] indexed name not integer

i appreciate if me.

you have declared array type:

type patterncount_memory array (31 0) of std_logic_vector(4 downto 0); signal patterncount : patterncount_memory;

you access elements in array this:

a <= patterncount(3); b <= patterncount(0);

as can see, array indexed integer. if have bitfield:

signal bit_field : std_logic_vector(4 downto 0) := "01010";

then error index array directly using this:

a <= patterncount(bit_field);  -- error, indexed name not integer

you want convert bitfield, interpreted integer:

a <= patterncount(to_integer(unsigned(bit_field)));  -- ok, have converted our bitfield

these conversion functions available when using numeric_std package.

Maxid