Hi Herbert,
As Debraj mentioned that it is an issue with the function, if you slightly modify your architecture RTL_COUNT as shown below, you will be able to resolve the issue. I have written for loops separately outside the function.
architecture RTL_COUNT of count_bits is
attribute KEEP_HIERARCHY of RTL_COUNT : architecture is "TRUE";
begin
out_proc : process (clk)
variable ones_v : natural range 0 to 8;
variable zeros_v : natural range 0 to 8;
begin
if rising_edge(clk) then
-- ones_v := count_bits_f(din, '1');
for I in din'range loop
if din(I) = '1' then
ones_v := ones_v + 1;
end if;
end loop;
--zeros_v := count_bits_f(din, '0');
for I in din'range loop
if din(I) = '0' then
zeros_v := zeros_v + 1;
end if;
end loop;
ones <= to_unsigned(ones_v, 4);
zeros <= to_unsigned(zeros_v, 4);
end if;
end process;
end RTL_COUNT;
Regards,
Ashish
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