add pmod ssd

ssd/src/ssd_top.vhdl

@@ -0,0 +1,78 @@
+library ieee;
+use ieee.std_logic_1164.all;
+
+entity ssd_top is
+
+    port(
+        clk : in std_logic;
+        sw  : in std_logic_vector(3 downto 0);
+        btn : in std_logic_vector(3 downto 0);
+
+        led : out std_logic_vector(3 downto 0);
+        jb  : out std_logic_vector(7 downto 0);
+        jc  : out std_logic_vector(7 downto 0);
+        jd  : out std_logic_vector(7 downto 0);
+        je  : out std_logic_vector(7 downto 0)
+    );
+
+end entity;
+
+architecture behav of ssd_top is
+
+    component pmod_ssd is
+        port(
+            clk         : in std_logic;
+            digit_in    : in std_logic_vector(3 downto 0);
+            digit_sel   : in std_logic;
+            digit_write : in std_logic;
+
+            header_1    : out std_logic_vector(3 downto 0);
+            header_2    : out std_logic_vector(3 downto 0)
+        );
+    end component;
+
+    signal pmod_1_digit_sel : std_logic;
+    signal pmod_1_digit_write : std_logic;
+    signal pmod_2_digit_sel : std_logic;
+    signal pmod_2_digit_write : std_logic;
+
+    signal ssd_out_1 : std_logic_vector(7 downto 0);
+    signal ssd_out_2 : std_logic_vector(7 downto 0);
+
+begin
+
+    U1: pmod_ssd port map(
+        clk,
+        digit_in => sw,
+        digit_sel => pmod_1_digit_sel,
+        digit_write => pmod_1_digit_write,
+        
+        header_1 => ssd_out_1(7 downto 4),
+        header_2 => ssd_out_1(3 downto 0)
+    );
+
+    U2: pmod_ssd port map(
+        clk,
+        digit_in => sw,
+        digit_sel => pmod_2_digit_sel,
+        digit_write => pmod_2_digit_write,
+        
+        header_1 => ssd_out_2(7 downto 4),
+        header_2 => ssd_out_2(3 downto 0)
+    );
+
+    jb(3 downto 0) <= ssd_out_1(7 downto 4);
+    jc(3 downto 0) <= ssd_out_1(3 downto 0);
+
+    jd(3 downto 0) <= ssd_out_2(7 downto 4);
+    je(3 downto 0) <= ssd_out_2(3 downto 0);
+
+    led <= sw;
+
+    pmod_1_digit_sel <= btn(1);
+    pmod_1_digit_write <= btn(0) or btn(1);
+
+    pmod_2_digit_sel <= btn(3);
+    pmod_2_digit_write <= btn(3) or btn(2);
+
+end architecture;