project05: base files

05/CPU.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/CPU.hdl
+/**
+ * The Hack Central Processing unit (CPU).
+ * Parses the binary code in the instruction input and executes it according to the
+ * Hack machine language specification. In the case of a C-instruction, computes the
+ * function specified by the instruction. If the instruction specifies to read a memory
+ * value, the inM input is expected to contain this value. If the instruction specifies
+ * to write a value to the memory, sets the outM output to this value, sets the addressM
+ * output to the target address, and asserts the writeM output (when writeM = 0, any
+ * value may appear in outM).
+ * If the reset input is 0, computes the address of the next instruction and sets the
+ * pc output to that value. If the reset input is 1, sets pc to 0.
+ * Note: The outM and writeM outputs are combinational: they are affected by the
+ * instruction's execution during the current cycle. The addressM and pc outputs are
+ * clocked: although they are affected by the instruction's execution, they commit to
+ * their new values only in the next cycle.
+ */
+CHIP CPU {
+
+    IN  inM[16],         // M value input  (M = contents of RAM[A])
+        instruction[16], // Instruction for execution
+        reset;           // Signals whether to re-start the current
+                         // program (reset==1) or continue executing
+                         // the current program (reset==0).
+
+    OUT outM[16],        // M value output
+        writeM,          // Write to M? 
+        addressM[15],    // Address in data memory (of M)
+        pc[15];          // address of next instruction
+
+    PARTS:
+	//// Replace this comment with your code.
+}