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- added ac97

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git-svn-id: http://moon:8086/svn/vhdl/trunk@259 cc03376c-175c-47c8-b038-4cd826a8556b
This commit is contained in:
jens
2009-01-18 22:08:13 +00:00
parent 03780653b8
commit 73f7a85646
1 changed files with 28 additions and 2 deletions
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projects/mips_sys/src/tb_mips_sys.vhd
+28 -2
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@@ -38,7 +38,7 @@ END tb_mips_sys;
ARCHITECTURE behavior OF tb_mips_sys IS
constant CLK_PERIOD : time := 10 ns;
constant AC97_CLK_PERIOD : time := 100 ns;
constant AC97_CLK_PERIOD : time := 83 ns;
signal sys_rst_n_in : std_logic := '0';
signal sys_clk_in : std_logic := '1';
signal dip : unsigned(7 downto 0) := (others => '0');
@@ -106,6 +106,11 @@ ARCHITECTURE behavior OF tb_mips_sys IS
type flash_data_t is array (natural range 0 to 2**16-1) of word_t;
signal flash_data : flash_data_t;
signal ac_frame_reg : unsigned(255 downto 0) := (others => '0');
signal ac_left : unsigned(17 downto 0) := X"0000" & "00";
signal ac_right : unsigned(17 downto 0) := X"0000" & "01";
signal ac_synced : std_logic;
BEGIN
@@ -248,7 +253,28 @@ CLK_GEN: process
sys_clk_in <= not sys_clk_in;
end process;
sys_ac97_sdata_in <= '1'; --sys_ac97_sdata_out;
sys_ac97_sdata_in <= ac_frame_reg(ac_frame_reg'left); --sys_ac97_sdata_out;
ac97_data_gen :
PROCESS(sys_ac97_bit_clk)
begin
if rising_edge(sys_ac97_bit_clk) then
ac_frame_reg <= ac_frame_reg(ac_frame_reg'left-1 downto 0) & '0';
if sys_flash_ac97_rstn = '0' then
ac_synced <= '0';
elsif sys_ac97_ssync = '1' then
if ac_synced = '0' then
ac_frame_reg <= X"F800_00000_00000" & ac_left & "00" & ac_right & "00" & X"00000_00000_00000_00000_00000_00000_00000_00000";
ac_left <= ac_left + 2;
ac_right <= ac_right + 2;
ac_synced <= '1';
end if;
else
ac_synced <= '0';
end if;
end if;
END PROCESS;
ac97_clk_gen : PROCESS
begin