From d3a0cc3a8ba6dfeb64d3faeffdeb6845b60e5840 Mon Sep 17 00:00:00 2001
From: Yuchen Pei <me@ypei.me>
Date: Sat, 20 Jan 2018 15:41:49 +0100
Subject: rearranged the dir for github

- removed tools and pdfs
- rearranged the projects dirs
- added md files
- other minor changes
---
 chips/PC.hdl | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)
 create mode 100644 chips/PC.hdl

(limited to 'chips/PC.hdl')

diff --git a/chips/PC.hdl b/chips/PC.hdl
new file mode 100644
index 0000000..aba68d1
--- /dev/null
+++ b/chips/PC.hdl
@@ -0,0 +1,32 @@
+// 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/03/a/PC.hdl
+
+/**
+ * A 16-bit counter with load and reset control bits.
+ * if      (reset[t] == 1) out[t+1] = 0
+ * else if (load[t] == 1)  out[t+1] = in[t]
+ * else if (inc[t] == 1)   out[t+1] = out[t] + 1  (integer addition)
+ * else                    out[t+1] = out[t]
+ */
+
+CHIP PC {
+    IN in[16],load,inc,reset;
+    OUT out[16];
+
+    PARTS:
+    // Put your code here:
+    Mux16 (a=out5, b=in, sel=load, out=out0);
+    Inc16 (in=out0, out=out1);
+    Mux16 (a=out1, b=out0, sel=load, out=out2);
+    Mux16 (a=out0, b=out2, sel=inc, out=out3);
+    Mux16 (a=out3, b=false, sel=reset, out=out4);
+    Register (in=out4, load=true, out=out5, out=out);
+
+    //Inc16 (in=out4, out=out0);
+    //Mux16 (a=out4, b=out0, sel=inc, out=out1);
+    //Mux16 (a=out1, b=in, sel=load, out=out2);
+    //Mux16 (a=out2, b=false, sel=reset, out=out3);
+    //Register (in=out3, load=true, out=out4, out=out);
+}
-- 
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