feat: cpu, memory, computer hdl

project-5-computer-architecture/hdl/Computer.hdl

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+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/5/Computer.hdl
+/**
+ * The Hack computer, consisting of CPU, ROM and RAM.
+ * When reset = 0, the program stored in the ROM executes.
+ * When reset = 1, the program's execution restarts. 
+ * Thus, to start running the currently loaded program,
+ * set reset to 1, and then set it to 0. 
+ * From this point onwards, the user is at the mercy of the software.
+ * Depending on the program's code, and whether the code is correct,
+ * the screen may show some output, the user may be expected to enter
+ * some input using the keyboard, or the program may do some procerssing. 
+ */
+CHIP Computer {
+
+    IN reset;
+
+    PARTS:
+
+    ROM32K(
+        address=pcOut,
+        out=romInstructionOut
+     );
+
+    CPU(
+        inM=memoryOut, 
+        instruction=romInstructionOut, 
+        reset=reset, 
+        outM=cpuOutMOut, 
+        writeM= cpuWriteMOut, 
+        addressM= cpuAddressMOut,
+        pc=pcOut
+    );
+
+    Memory(
+        in= cpuOutMOut, 
+        load= cpuWriteMOut, 
+        address= cpuAddressMOut, 
+        out=memoryOut 
+    );
+
+}