week9

皆參考其他同學的!

Memory

// 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:
    Not(in = address[14], out = RAM);
    And(a = RAM, b = load, out = RAMLOAD);
    RAM16K(in = in, address = address[0..13], load = RAMLOAD, out = X);

    And(a = address[14], b = load, out = screenLOAD);
    Screen(in = in, address = address[0..12], load = screenLOAD, out = Y);

    Keyboard(out = kyout);

    Mux16(a = Y, b = kyout, sel = address[13], out = Z);

    Mux16(a = X, b = Z, sel = address[14], out = out);
}

Computer

// 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:
    Memory(in=inM, load=loadM, address=AM, out=OUTMemory);
    CPU(inM=OUTMemory, instruction=instruction, reset=reset, outM=inM, writeM=loadM, addressM=AM, pc=NInstruction);
    ROM32K(address=NInstruction, out=instruction);
}