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//// ////
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//// ////
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////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////
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`include "timescale.v"
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`include "timescale.v"
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module t6507lp_fsm(clk, reset_n, alu_result, alu_status, data_in, address, mem_rw, data_out, alu_opcode, alu_a, alu_enable, alu_x, alu_y);
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module t6507lp_fsm(clk, reset_n, alu_result, alu_status, data_in, alu_x, alu_y, address, mem_rw, data_out, alu_opcode, alu_a, alu_enable);
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parameter [3:0] DATA_SIZE = 4'd8;
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parameter [3:0] DATA_SIZE = 4'd8;
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parameter [3:0] ADDR_SIZE = 4'd13;
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parameter [3:0] ADDR_SIZE = 4'd13;
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localparam [3:0] DATA_SIZE_ = DATA_SIZE - 4'b0001;
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localparam [3:0] DATA_SIZE_ = DATA_SIZE - 4'b0001;
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localparam [3:0] ADDR_SIZE_ = ADDR_SIZE - 4'b0001;
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localparam [3:0] ADDR_SIZE_ = ADDR_SIZE - 4'b0001;
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input clk; // master clock
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input clk; // master clock
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input reset_n; // active low reset
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input reset_n; // active low reset
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input [DATA_SIZE_:0] alu_result; // result from alu operation
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input [DATA_SIZE_:0] alu_result; // result from alu operation
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input [DATA_SIZE_:0] alu_status; // alu status register
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input [DATA_SIZE_:0] alu_status; // alu status register
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input [DATA_SIZE_:0] data_in; // data that comes from the bus controller
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input [DATA_SIZE_:0] data_in; // data that comes from the bus controller
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input [DATA_SIZE_:0] alu_x; // alu x index register
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input [DATA_SIZE_:0] alu_y; // alu y index register
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output reg [ADDR_SIZE_:0] address; // system bus address
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output reg [ADDR_SIZE_:0] address; // system bus address
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output reg mem_rw; // read = 0, write = 1
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output reg mem_rw; // read = 0, write = 1
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output reg [DATA_SIZE_:0] data_out; // data that will be written somewhere else
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output reg [DATA_SIZE_:0] data_out; // data that will be written somewhere else
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output reg [DATA_SIZE_:0] alu_opcode; // current opcode
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output reg [DATA_SIZE_:0] alu_opcode; // current opcode
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output reg [DATA_SIZE_:0] alu_a; // extra operand sent to the alu
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output reg [DATA_SIZE_:0] alu_a; // extra operand sent to the alu
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output reg alu_enable; // a flag that when high tells the alu when to perform the operations
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output reg alu_enable; // a flag that when high tells the alu when to perform the operations
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input [DATA_SIZE_:0] alu_x;
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input [DATA_SIZE_:0] alu_y;
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// FSM states. If aiming for less power consumption try gray coding.
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// FSM states. If aiming for less power consumption try gray coding.
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//localparam FETCH_OP_CALC = 5'b00001; this was never used
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//localparam FETCH_OP_CALC = 5'b00001; this was never used
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localparam FETCH_OP = 5'b00000;
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localparam FETCH_OP = 5'b00000;
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localparam FETCH_LOW = 5'b00010;
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localparam FETCH_LOW = 5'b00010;
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