sm_module.vhd

FPGA与DSP的EMIFA口接口程序.在FPGA内分配了两块双BUFFER与DSP进行通信.

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_SIGNED.ALL;

entity sm_module is
port(
		gclk_in				:	in	std_logic;
		clk_rx_in			:	in	std_logic;		
		rx_offset			:	in	std_logic_vector(12 downto 0);
		sm_out				:	out	std_logic_vector(18 downto 0);
		sm_offset_out	:	out	std_logic_vector(18 downto 0));	
end sm_module;

architecture Behavioral of sm_module is
--------------------------------------------------------------------------------------------------- 
signal	sm_flag	:	std_logic_vector(10 downto 0):="00000000000";
signal	flag		:	std_logic:='0';

signal	sm				:	std_logic_vector(18 downto 0):="0000000000000000000";
signal	sm_offset	:	std_logic_vector(18 downto 0):="0000000000000000000";

begin
sm_out(18 downto 0) 	<=	sm(18 downto 0);
sm_offset_out(18 downto 0)	<=	sm_offset(18 downto 0);
---------------------------------------------------------------------------------------------------
P_gen_sm_flag:process(gclk_in)
begin
if rising_edge(gclk_in)	then
	sm_flag(10 downto 0)	<=	sm_flag(10 downto 0) + 1;
	if sm_flag(10 downto 0) = "11111111111"	then
		flag <= '1';
	else
		null;
	end if;
end if;
end process;
---------------------------------------------------------------------------------------------------
P_count1:process(gclk_in)
begin
if rising_edge(gclk_in)	then
	if	flag = '0'	then
		sm(18 downto 0) <=	"0000000000000000000";
	elsif flag = '1'	then
		sm(18 downto 0) <=	sm(18 downto 0) + 1;
	end if;
end if;									    
end process;																															
---------------------------------------------------------------------------------------------------
P_count2:process(clk_rx_in)
begin
if rising_edge(clk_rx_in)	then
	if	flag = '0'	then
		sm_offset(18 downto 0) <=	"0000000000000000000";
	elsif flag = '1'	then
		sm_offset(18 downto 0) <=	sm_offset(18 downto 0) + 1;
	end if;
end if;									    
end process;
---------------------------------------------------------------------------------------------------
end Behavioral;