Conditional when statement with port map

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Hi,

I am trying to write a conditional concurrent port map without success. Here it is.

   map_gen: for i in 0 to N-1 generate
                    map_0: entity work.my_tff(arch) port map('1', '1', clk, s_q_out(0), s_en_out(0)) when i=0 else
                    map_g: entity work.my_tff(arch) port map(s_q_out(i-1), s_en_out(i-1), clk, s_q_out(i), s_en_out(i));
            end generate;

What´s is wrong?

Regards

Jaraqui

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why don't you just port map for case 0 directly then generate for case i in 1 to N-1

anyway you can't use if like that. each generate is written with its condition being true

Just trying to write compact code... only for curiosity.

Looking at the when/else examples of the books, I allways observed that a just single statement is presented.

What happens if someone is interested to write something like the code bellow? Is it possible?

    statement_a_1; statement_a_2; ... when signal = a else
    statement_b_1; statement_b_2; ... when signal = b else
   ...
    statement_z_1; statement_z_2;

Regards

Jaraqui

you code isnt quite right, because it has too many ; in it. I think you mean something like:

a <=      b when x = '1' 
     else c when y = '1'
     else d when z = '1'
     else e;

Remember to have the final else, otherwise you generate a latch.