From a000308104aab27c2dde9a306f1bc654b2db4806 Mon Sep 17 00:00:00 2001 From: Yuchen Pei Date: Wed, 29 Nov 2017 12:30:41 +0100 Subject: first commit --- tools/builtInChips/ARegister.hdl | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) create mode 100644 tools/builtInChips/ARegister.hdl (limited to 'tools/builtInChips/ARegister.hdl') diff --git a/tools/builtInChips/ARegister.hdl b/tools/builtInChips/ARegister.hdl new file mode 100644 index 0000000..23aee73 --- /dev/null +++ b/tools/builtInChips/ARegister.hdl @@ -0,0 +1,24 @@ +// 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/ARegister.hdl + +/** + * A 16-Bit register called "A Register". + * If load[t-1]=1 then out[t] = in[t-1] + * else out does not change (out[t] = out[t-1]) + * + * This built-in chip implementation has the side effect of + * providing a GUI representation of a 16-bit register + * called "A register" (typically used to store an address). + */ + +CHIP ARegister { + + IN in[16], load; + OUT out[16]; + + BUILTIN ARegister; + CLOCKED in, load; +} + -- cgit v1.2.3