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+# Noter til digital design m2
+
+Configurable element
+:   I think the same as logic block
+
+Island type architecture:
+:   How to interconnect the configurable busses between Logic blocks
+:   This can be done as either DISJOINT, UNIVERSAL or WILTON
+
+## VHDL
+
+Her bruger man rigtig meget `ENTITY` i stedet for verilog module.
+
+```vhdl
+ENTITY nor_gate IS
+    PORT (
+        x: IN STD_LOGIC;
+        y: IN STD_LOGIC;
+        z: OUT STD_LOGIC;
+        );
+END nor_gate;
+```
+
+Here semicolon is a seperator.
+`STD_LOGIC` is for boolean values.
+
+`Architecture implements the ENTITY`.
+
+```vhdl
+ARCHITECTURE sample OF nor_gate IS
+BEGIN
+    z <= x NOR y;
+END sample;
+```
+
+`INOUT` can be used have an input and output, so *bi-directional*.
+
+Different types, these come with IEEE libraries.
+
+- `STD_LOGIC`: boolean (`1`, `0`, `Z`), with Z being high impedance
+
+    THere are more options here but chose were not covered.
+- `STD_LOGIC_VECTOR`: Sequence of values.
+
+```
+STD_LOGIC_VECTOR(7 DOWNTO 0): for MSB
+```
+
+`SIGNAL` is a wire inside the design.
+
+```
+SIGNAL x: STD_LOGIC
+```
+
+Okay so `COMPONENTS` are the equivilent of functions.