Query on fractional divider logic

[sundar_ece]

Hi All,


I need your help in understanding this fractional divider logic that
is implemented in the following code.





--******************************************************

ClkDiv2 : process(nMr, Clk78) -- divide by 38.88

variable Cnt : integer range 0 to 63;

variable SubCnt : integer range 0 to 32;

begin

if (nMr='0') then

Clk2 <= '0';

Cnt := 0;

SubCnt := 0;

elsif rising_edge(Clk78) then

if (Cnt>18 ) then

Clk2 <= '1';

else

Clk2 <= '0';

end if;

if (Cnt>37) or ((Cnt>36) and ((SubCnt=0) or (SubCnt=8 ) or
(SubCnt=17))) then

Cnt := 0;

if (SubCnt>23) then

SubCnt := 0;

else

SubCnt := SubCnt+1;

end if;

else

Cnt := Cnt+1;

end if;

end if;

end process;



--***************************************************


can you explain how the clock division factors for "divide by 38.88"
are achieved?

can you provide any algorithm/formulae for reference?

Regards,
Sundar