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URL https://opencores.org/ocsvn/ion/ion/trunk

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  • This comparison shows the changes necessary to convert path 
    /ion/trunk/vhdl
    from Rev 62 to Rev 63
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  •

Rev 62 → Rev 63

/demo/c2sb_demo.vhdl
80,9 → 80,15
 
 
--##############################################################################
--
-- I/O registers
 
 
signal sd_clk_reg : std_logic;
signal sd_cs_reg : std_logic;
signal sd_cmd_reg : std_logic;
signal sd_do_reg : std_logic;
 
 
-- CPU access to hex display
signal reg_display : std_logic_vector(15 downto 0);
 
188,9 → 194,47
);
 
 
reg_display <= io_wr_data(15 downto 0);
reg_gleds <= io_rd_vma & "000" & io_byte_we;
--##############################################################################
-- I/O registers
--##############################################################################
 
hex_display_register:
process(clk)
begin
if clk'event and clk='1' then
if io_byte_we/="0000" and io_wr_addr(15 downto 12)=X"2" then
reg_display <= io_wr_data(15 downto 0);
end if;
end if;
end process hex_display_register;
sd_control_register:
process(clk)
begin
if clk'event and clk='1' then
if io_byte_we/="0000" and io_wr_addr(15 downto 12)=X"1" then
if io_wr_addr(5)='1' then
sd_clk_reg <= io_wr_addr(4);
end if;
if io_wr_addr(7)='1' then
sd_cs_reg <= io_wr_addr(6);
end if;
if io_wr_addr(11)='1' then
sd_do_reg <= io_wr_data(0);
end if;
end if;
end if;
end process sd_control_register;
 
-- Show the SD interface signals on the green leds for debug
reg_gleds <= sd_clk_reg & sd_in & sd_do_reg & "000" & sd_cmd_reg & sd_cs_reg;
 
io_rd_data(0) <= sd_in;
io_rd_data(31 downto 22) <= switches;
 
 
 
-- red leds (light with '1') -- some CPU control signals
red_leds(0) <= '0';
red_leds(1) <= '0';
298,13 → 342,20
-- SD card interface
--##############################################################################
 
-- unused in this demo
sd_cs <= '0';
sd_cmd <= '0';
sd_clk <= '0';
sd_in <= 'Z';
-- Connect to FFs for use in bit-banged interface
--sd_cs <= sd_cs_reg;
--sd_cmd <= sd_do_reg;
--sd_clk <= sd_clk_reg;
--sd_data <= 'Z' when sd_do_reg='1' else '0';
--sd_in <= sd_data;
 
sd_cs <= sd_cs_reg;
sd_cmd <= sd_do_reg;
sd_clk <= sd_clk_reg;
--sd_data <= 'Z';-- when sd_do_reg='1' else '0';
sd_in <= sd_data;
 
 
--##############################################################################
-- SERIAL
--##############################################################################

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