Help needed in VHDL Testbench

Ok, i will post an example , I am just writing the entity and the portmap. I hope so this would be enough for you to have an idea of what I trying to ask.

Consider this as the first source code ,

Consider the output port rise_o

entity tdc_decode is
    port (reset_n_i      : in std_logic;      --asynch reset
          clk_128meg_i   : in std_logic;   --128 meg system clock
      enable_i       : in std_logic;   -- enable signal
      tdc_i          : in std_logic_vector(63 downto 0);    -- tdc data
      rise_o         : out std_logic_vector(5 downto 0);    -- value for rise
      rise_fall_o    : out std_logic_vector(6 downto 0));  -- rise - fall value
end tdc_decode;

The testbench (port mapping section) for this source code is as follows:

  uut: tdc_decode
  port map (reset_n_i => reset_n_i,
            clk_128meg_i => clk_128meg_i,
            enable_i => enable_i,
            tdc_i => tdc_i,
            rise_o => rise_o,
            rise_fall_o => rise_fall_o
           );

This is the second source code tdc_readout

entity tdc_readout is
    port (reset_n_i : in std_logic;
      enable_i : in std_logic;
      clk_128meg_i : in std_logic;
      tdc_i : in std_logic_vector(63 downto 0);         --tdc data
      scale_i : in std_logic_vector(7 downto 0);        --scaling value from spi reg
      rise_fall_o : out std_logic_vector(6 downto 0);   --calculated rise fall value to spi
      phi_frac_o : out std_logic_vector(13 downto 0));  --phi fractional value to add3
end tdc_readout;

However,I am going to port map the inputs of tdc_decode in tdc_readout:

i_tdc_decode : tdc_decode
  port map (reset_n_i       => reset_n_i,      -- reset from pad
            clk_128meg_i    => clk_128meg_i,   -- system clock
            enable_i        => enable_i,
        tdc_i           => tdc_reg_s,
        rise_o          => rise_s,
        rise_fall_o     => rise_fall_o);   

Now, what I need is to use the output port "rise_o values " which I calculated in tdc_decode in my next testbench that I have written for tdc_readout (i.e. tb_tdc_readout). How can I do that. Was I clear?