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projects/03/a/RAM8.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/03/a/RAM8.hdl
+
+/**
+ * Memory of 8 registers, each 16 bit-wide. Out holds the value
+ * stored at the memory location specified by address. If load==1, then 
+ * the in value is loaded into the memory location specified by address 
+ * (the loaded value will be emitted to out from the next time step onward).
+ */
+
+CHIP RAM8 {
+    IN in[16], load, address[3];
+    OUT out[16];
+
+    PARTS:
+    DMux8Way(in=load, sel=address, a=load1, b=load2, c=load3, d=load4, e=load5, f=load6, g=load7, h=load8);
+    Register(in=in, load=load1, out=out1);
+    Register(in=in, load=load2, out=out2);
+    Register(in=in, load=load3, out=out3);
+    Register(in=in, load=load4, out=out4);
+    Register(in=in, load=load5, out=out5);
+    Register(in=in, load=load6, out=out6);
+    Register(in=in, load=load7, out=out7);
+    Register(in=in, load=load8, out=out8);
+    Mux8Way16(a=out1, b=out2, c=out3, d=out4, e=out5, f=out6, g=out7, h=out8, sel=address, out=out);
+}