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cpu_checker.v
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`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 2020/10/06 18:31:21
// Design Name:
// Module Name: cpu_checker
// Project Name:
// Target Devices:
// Tool Versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
`define AFTER_OTHER 0
`define DURING_TIME 1
`define DURING_PC 2
`define AFTER_PC 3
`define DURING_REG 4
`define DURING_ADDR 5
`define BEFORE_ASN 6
`define ASSIGN_SBL 7
`define AFTR_ASNSBL 8
`define DURING_DATA 9
`define FINISH 10
`define RESET time_cnt=0;pc_cnt=0;reg_cnt=0;addr_cnt=0;data_cnt=0;type=0
module cpu_checker(
input clk,
input reset,
input [7:0] char,
output [1:0] format_type,
output reg [3:0] state = `AFTER_OTHER
);
integer time_cnt = 0, pc_cnt = 0, reg_cnt = 0, addr_cnt = 0, data_cnt = 0, type = 0;
always @(posedge clk) begin
if (reset) begin
state <= `AFTER_OTHER;
`RESET;
end
else case (state)
`AFTER_OTHER:
if (char == "^") begin
state <= `DURING_TIME;
`RESET;
end
else begin
state <= `AFTER_OTHER;
end
`DURING_TIME:
if (char == "^") begin
state <= `DURING_TIME;
`RESET;
end
else if ("0" <= char && char <= "9" && time_cnt < 4) begin
state <= `DURING_TIME;
time_cnt = time_cnt + 1;
end
else if (char == "@" && 0 < time_cnt && time_cnt <= 4) begin
state <= `DURING_PC;
end
else begin
state <= `AFTER_OTHER;
end
`DURING_PC:
if (char == "^") begin
state <= `DURING_TIME;
`RESET;
end
else if (("0" <= char && char <= "9" || "a" <= char && char <= "f") && pc_cnt < 8) begin
state <= `DURING_PC;
pc_cnt = pc_cnt + 1;
end
else if (char == ":" && pc_cnt == 8) begin
state <= `AFTER_PC;
end
else begin
state <= `AFTER_OTHER;
end
`AFTER_PC:
if (char == "^") begin
state <= `DURING_TIME;
`RESET;
end
else if (char == " ") begin
state <= `AFTER_PC;
end
else if (char == "$") begin
state <= `DURING_REG;
type = 1;
end
else if (char == "\052") begin // "\052" is an asterisk symbol
state <= `DURING_ADDR;
type = 2;
end
else begin
state <= `AFTER_OTHER;
end
`DURING_REG:
if (char == "^") begin
state <= `DURING_TIME;
`RESET;
end
else if ("0" <= char && char <= "9" && reg_cnt < 4) begin
state <= `DURING_REG;
reg_cnt = reg_cnt + 1;
end
else if (char == " " && 0 < reg_cnt && reg_cnt <= 4) begin
state <= `BEFORE_ASN;
end
else if (char == "<" && 0 < reg_cnt && reg_cnt <= 4) begin
state <= `ASSIGN_SBL;
end
else begin
state <= `AFTER_OTHER;
end
`BEFORE_ASN:
if (char == "^") begin
state <= `DURING_TIME;
`RESET;
end
else if (char == " ") begin
state <= `BEFORE_ASN;
end
else if (char == "<") begin
state <= `ASSIGN_SBL;
end
else begin
state <= `AFTER_OTHER;
end
`ASSIGN_SBL:
if (char == "^") begin
state <= `DURING_TIME;
`RESET;
end
else if (char == "=") begin
state <= `AFTR_ASNSBL;
end
else begin
state <= `AFTER_OTHER;
end
`AFTR_ASNSBL:
if (char == "^") begin
state <= `DURING_TIME;
`RESET;
end
else if (char == " ") begin
state <= `AFTR_ASNSBL;
end
else if ("0" <= char && char <= "9" || "a" <= char && char <= "f") begin
state <= `DURING_DATA;
data_cnt = data_cnt + 1;
end
else begin
state <= `AFTER_OTHER;
end
`DURING_DATA:
if (char == "^") begin
state <= `DURING_TIME;
`RESET;
end
else if (("0" <= char && char <= "9" || "a" <= char && char <= "f") && data_cnt < 8) begin
state <= `DURING_DATA;
data_cnt = data_cnt + 1;
end
else if (char == "#" && data_cnt == 8) begin
state <= `FINISH;
end
else begin
state <= `AFTER_OTHER;
end
`DURING_ADDR:
if (char == "^") begin
state <= `DURING_TIME;
`RESET;
end
else if (("0" <= char && char <= "9" || "a" <= char && char <= "f") && addr_cnt < 8) begin
state <= `DURING_ADDR;
addr_cnt = addr_cnt + 1;
end
else if (char == " " && addr_cnt == 8) begin
state <= `BEFORE_ASN;
end
else if (char == "<" && addr_cnt == 8) begin
state <= `ASSIGN_SBL;
end
else begin
state <= `AFTER_OTHER;
end
`FINISH:
if (char == "^") begin
state <= `DURING_TIME;
`RESET;
end
else begin
state <= `AFTER_OTHER;
end
default: state <= `AFTER_OTHER;
endcase
end
assign format_type = (state == `FINISH) ? type : 0;
endmodule