// File name: Decode.hdl /** * The instruction decoder determines the type of instruction (a or c) * and decodes those instructions. * The input in[16] is the instruction to be decoded. * The outputs are used as follows: * type: 0 if a-instruction, 1 if c-instruction. * a: Determines whether the ALU input uses A (0) or Memory[A] (1) * c1 .. c6: Op-code wires to ALU * d1 d2 d3: Destination wires to the load pins of A,D registers and Memory * j1 j2 j3: Jump wires to Jump Unit * For a-instructions, d1 should be 1, all other outputs should be 0 * For c-instructions, outputs should correspond to their bits in the c-instruction */ CHIP Decode { IN in[16]; // instruction to decode OUT type, // Instruction type a, // ALU A/M c1,c2,c3,c4,c5,c6, // Op-code wires to ALU d1,d2,d3, // Destination wires j1,j2,j3; // Jump wires

Question

// File name: Decode.hdl

/**

The instruction decoder determines the type of instruction (a or c)
and decodes those instructions.
The input in[16] is the instruction to be decoded.
The outputs are used as follows:
type: 0 if a-instruction, 1 if c-instruction.
a: Determines whether the ALU input uses A (0) or Memory[A] (1)
c1 .. c6: Op-code wires to ALU
d1 d2 d3: Destination wires to the load pins of A,D registers and Memory
j1 j2 j3: Jump wires to Jump Unit
For a-instructions, d1 should be 1, all other outputs should be 0
For c-instructions, outputs should correspond to their bits in the c-instruction */

CHIP Decode {

IN  in[16];             // instruction to decode

OUT type,               // Instruction type
    a,                  // ALU A/M
    c1,c2,c3,c4,c5,c6,  // Op-code wires to ALU
    d1,d2,d3,           // Destination wires
    j1,j2,j3;           // Jump wires

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