Building a Standards Converter

[`FRANK.C]

Hi Jac
If you replace the following lines from the i2c_com file:

   if CH_HEX = "0000" then V_RF_ON_DATA <= '1'; A_RF_ON_DATA <= '1';
       else V_RF_ON_DATA <= not V_RF_ON; A_RF_ON_DATA <= not A_RF_ON;
   end if;
 
   RF_CF_DATA_SEND(4)                     <= RF_CF_DATA(4);
   RF_CF_DATA_SEND(3) (15 downto 7) <= RF_CF_DATA(3) (15 downto 7);
   RF_CF_DATA_SEND(3) (6)                 <= V_RF_ON_DATA; -- turn off video rf oscillator
   RF_CF_DATA_SEND(3) (5)                 <= V_RF_ON_DATA; -- turn off video rf modulator
   RF_CF_DATA_SEND(3) (4 downto 0)     <= RF_CF_DATA(1) (4 downto 0);
   RF_CF_DATA_SEND(2)                     <= RF_CF_DATA(2);
   RF_CF_DATA_SEND(1) (15 downto 7) <= RF_CF_DATA(1) (15 downto 7);
   RF_CF_DATA_SEND(1) (6)                 <= A_RF_ON_DATA; -- turn off audio rf oscillator
   RF_CF_DATA_SEND(1) (5)                 <= A_RF_ON_DATA; -- turn off audio rf modulator
   RF_CF_DATA_SEND(1) (4 downto 0)     <= RF_CF_DATA(1) (4 downto 0);  


with

  if CH_HEX = "0000" then V_RF_ON_DATA <= '1'; A_RF_ON_DATA <= '1';
       else V_RF_ON_DATA <= not V_RF_ON; A_RF_ON_DATA <= not A_RF_ON;
   end if;

   RF_CF_DATA_SEND(4)                     <= RF_CF_DATA(4);
   RF_CF_DATA_SEND(3) (15 downto 7) <= RF_CF_DATA(3) (15 downto 7);

   if RF_CF_DATA(3) (6) = '0' and RF_CF_DATA(3) (5) = '0' and V_RF_ON_DATA = '0' then
   RF_CF_DATA_SEND(3) (6)                 <= '0'; -- turn on video rf oscillator
   RF_CF_DATA_SEND(3) (5)                 <= '0'; -- turn on video rf modulator
   else
   RF_CF_DATA_SEND(3) (6)                 <= '1'; -- turn off video rf oscillator
   RF_CF_DATA_SEND(3) (5)                 <= '1'; -- turn off video rf modulator
   end if;

   RF_CF_DATA_SEND(3) (4 downto 0)     <= RF_CF_DATA(1) (4 downto 0);
   RF_CF_DATA_SEND(2)                     <= RF_CF_DATA(2);
   RF_CF_DATA_SEND(1) (15 downto 7) <= RF_CF_DATA(1) (15 downto 7);

   if RF_CF_DATA(1) (6) = '0' and RF_CF_DATA(1) (5) = '0' and A_RF_ON_DATA = '0' then
   RF_CF_DATA_SEND(1) (6)                 <= '0'; -- turn on audio
   RF_CF_DATA_SEND(1) (5)                 <= '0'; -- turn on audio rf modulator
   else
   RF_CF_DATA_SEND(1) (6)                 <= '1'; -- turn off audio rf oscillator
   RF_CF_DATA_SEND(1) (5)                 <= '1'; -- turn off audio rf modulator
   end if;

   RF_CF_DATA_SEND(1) (4 downto 0)     <= RF_CF_DATA(1) (4 downto 0);  

You should then be able to turn off the audio or video modulators within the channel data sets.
For example after substituting the above lines if you then change the channel 1 dataset from:

constant  CH1_CF_DATA      : ic2_data_array := ("0010110100000000", "1011001110000000", "0010100110000000", "1011001010000000"); -- modulators channel 1

to:

constant  CH1_CF_DATA      : ic2_data_array := ("0010110100000000", "1011001110000000", "0010100110000000", "1011001010100000"); -- modulators channel 1

the audio modulator should be turned off when channel 1 is selected.

Frank