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Diffstat (limited to 'tools/builtInChips/PC.hdl')
-rw-r--r-- | tools/builtInChips/PC.hdl | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/tools/builtInChips/PC.hdl b/tools/builtInChips/PC.hdl new file mode 100644 index 0000000..f102d99 --- /dev/null +++ b/tools/builtInChips/PC.hdl @@ -0,0 +1,22 @@ +// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: tools/builtIn/PC.hdl
+
+/**
+ * 16-bit counter with load and reset controls.
+ *
+ * If reset(t-1) then out(t) = 0
+ * else if load(t-1) then out(t) = in(t-1)
+ * else if inc(t-1) then out(t) = out(t-1) + 1 (integer addition)
+ * else out(t) = out(t-1)
+ */
+
+CHIP PC {
+
+ IN in[16], load, inc, reset;
+ OUT out[16];
+
+ BUILTIN PC;
+ CLOCKED in, load, inc, reset;
+}
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