Initial Commit with everything done

2021-04-13 00:07:23 +03:00
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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/05/CPU.hdl
+
+/**
+ * The Hack CPU (Central Processing unit), consisting of an ALU,
+ * two registers named A and D, and a program counter named PC.
+ * The CPU is designed to fetch and execute instructions written in 
+ * the Hack machine language. In particular, functions as follows:
+ * Executes the inputted instruction according to the Hack machine 
+ * language specification. The D and A in the language specification
+ * refer to CPU-resident registers, while M refers to the external
+ * memory location addressed by A, i.e. to Memory[A]. The inM input 
+ * holds the value of this location. If the current instruction needs 
+ * to write a value to M, the value is placed in outM, the address 
+ * of the target location is placed in the addressM output, and the 
+ * writeM control bit is asserted. (When writeM==0, any value may 
+ * appear in outM). The outM and writeM outputs are combinational: 
+ * they are affected instantaneously by the execution of the current 
+ * instruction. The addressM and pc outputs are clocked: although they 
+ * are affected by the execution of the current instruction, they commit 
+ * to their new values only in the next time step. If reset==1 then the 
+ * CPU jumps to address 0 (i.e. pc is set to 0 in next time step) rather 
+ * than to the address resulting from executing the current instruction. 
+ */
+
+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:
+    // Put your code here:
+    Not(in=instruction[15],out=negI);
+    Mux16(a=ALUResult,b=instruction,sel=negI,out=instructorMux);
+    Or(a=negI,b=instruction[5],out=ARegLoad);
+    And(a=instruction[4],b=instruction[15],out=DRegLoad);
+    And(a=instruction[15],b=instruction[3],out=writeM);
+    ARegister(in=instructorMux,load=ARegLoad,out=ARegOut,out[0..14]=addressM);
+    Mux16(a=ARegOut,b=inM,sel=instruction[12],out=inputMux);
+    DRegister(in=ALUResult,load=DRegLoad,out=DRegOut);
+    ALU(x=DRegOut,y=inputMux,zx=instruction[11],nx=instruction[10],zy=instruction[9],ny=instruction[8],f=instruction[7],no=instruction[6],out=ALUResult,out=outM,ng=ng,zr=zr);
+    
+    Not(in=ng,out=negng);
+    Not(in=zr,out=negzr);
+    And(a=instruction[2],b=ng,out=jmp1);
+    And(a=instruction[1],b=zr,out=jmp2);
+    And(a=instruction[0],b=negng,out=jmp31);
+    And(a=jmp31,b=negzr,out=jmp3);
+    Or(a=jmp1,b=jmp2,out=jmp4);
+    Or(a=jmp3,b=jmp4,out=jmp5);
+    And(a=jmp5,b=instruction[15],out=jmp);
+
+    PC(in=ARegOut,reset=reset,load=jmp,inc=true,out[0..14]=pc);
+
+
+    
+}
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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/05/Computer.hdl
+
+/**
+ * The HACK computer, including CPU, ROM and RAM.
+ * When reset is 0, the program stored in the computer's ROM executes.
+ * When reset is 1, the execution of the program restarts. 
+ * Thus, to start a program's execution, reset must be pushed "up" (1)
+ * and "down" (0). From this point onward the user is at the mercy of 
+ * the software. In particular, depending on the program's code, the 
+ * screen may show some output and the user may be able to interact 
+ * with the computer via the keyboard.
+ */
+
+CHIP Computer {
+
+    IN reset;
+
+    PARTS:
+    // Put your code here:
+    ROM32K(address=pc,out=instruction);
+    CPU(instruction=instruction,reset=reset,inM=inM,pc=pc,addressM=addressM,outM=outM,writeM=writeM);
+    Memory(in=outM,load=writeM,address=addressM,out=inM);
+}
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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/05/Memory.hdl
+
+/**
+ * The complete address space of the Hack computer's memory,
+ * including RAM and memory-mapped I/O. 
+ * The chip facilitates read and write operations, as follows:
+ *     Read:  out(t) = Memory[address(t)](t)
+ *     Write: if load(t-1) then Memory[address(t-1)](t) = in(t-1)
+ * In words: the chip always outputs the value stored at the memory 
+ * location specified by address. If load==1, the in value is loaded 
+ * into the memory location specified by address. This value becomes 
+ * available through the out output from the next time step onward.
+ * Address space rules:
+ * Only the upper 16K+8K+1 words of the Memory chip are used. 
+ * Access to address>0x6000 is invalid. Access to any address in 
+ * the range 0x4000-0x5FFF results in accessing the screen memory 
+ * map. Access to address 0x6000 results in accessing the keyboard 
+ * memory map. The behavior in these addresses is described in the 
+ * Screen and Keyboard chip specifications given in the book.
+ */
+
+CHIP Memory {
+    IN in[16], load, address[15];
+    OUT out[16];
+
+    PARTS:
+    // Put your code here:
+    DMux(in=load,sel=address[14],a=a,b=b);
+    DMux(in=b,sel=address[13],a=c,b=d);
+    RAM16K(in=in,load=a,address[0..13]=address[0..13],out=out1);
+    Screen(in=in,load=c,address[0..12]=address[0..12],out=out2);
+    Keyboard(out=out3);
+    Mux16(a=out2,b=out3,sel=address[13],out=out4);
+    Mux16(a=out1,b=out4,sel=address[14],out=out);
+}