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cpu_checker_challenging.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;period=0;error_type=0;grf=0;error=0
module cpu_checker(
input clk,
input reset,
input [7:0] char,
input [15:0] freq,
output [1:0] format_type,
output [3:0] error_code,
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, period = 0, error_type = 0, error = 0, grf = 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;
`RESET;
end
`DURING_TIME:
if (char == "^") begin
state <= `DURING_TIME;
`RESET;
end
else if ("0" <= char && char <= "9" && time_cnt < 4) begin
state <= `DURING_TIME;
period = (period << 1) + (period << 3) + char - "0";
time_cnt = time_cnt + 1;
end
else if (char == "@" && 0 < time_cnt && time_cnt <= 4) begin
state <= `DURING_PC;
if ((period & ((freq >> 1) - 1)) != 0) begin
error_type = error_type | 4'b0001;
end
end
else begin
state <= `AFTER_OTHER;
`RESET;
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;
if (!(( char == "0" && pc_cnt < 4) ||
((char == "3" || char == "4") && pc_cnt == 4) ||
(("0" <= char && char <= "9" || "a" <= char && char <= "f") && (pc_cnt == 5 || pc_cnt == 6)) ||
((char == "0" || char == "4" || char == "8" || char == "c") && pc_cnt == 7))) begin
error_type = error_type | 4'b0010;
end
pc_cnt = pc_cnt + 1;
end
else if (char == ":" && pc_cnt == 8) begin
state <= `AFTER_PC;
end
else begin
state <= `AFTER_OTHER;
`RESET;
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;
`RESET;
end
`DURING_REG:
if (char == "^") begin
state <= `DURING_TIME;
`RESET;
end
else if ("0" <= char && char <= "9" && reg_cnt < 4) begin
state <= `DURING_REG;
grf = (grf << 1) + (grf << 3) + char - "0";
reg_cnt = reg_cnt + 1;
end
else if (char == " " && 0 < reg_cnt && reg_cnt <= 4) begin
if (grf > 31) begin
error_type = error_type | 4'b1000;
end
state <= `BEFORE_ASN;
end
else if (char == "<" && 0 < reg_cnt && reg_cnt <= 4) begin
if (grf > 31) begin
error_type = error_type | 4'b1000;
end
state <= `ASSIGN_SBL;
end
else begin
state <= `AFTER_OTHER;
`RESET;
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;
`RESET;
end
`ASSIGN_SBL:
if (char == "^") begin
state <= `DURING_TIME;
`RESET;
end
else if (char == "=") begin
state <= `AFTR_ASNSBL;
end
else begin
state <= `AFTER_OTHER;
`RESET;
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;
`RESET;
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
error = error_type;
state <= `FINISH;
end
else begin
state <= `AFTER_OTHER;
`RESET;
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;
if (!(( char == "0" && addr_cnt < 8) ||
((char == "1" || char == "2") && addr_cnt == 4) ||
(("0" <= char && char <= "9" || "a" <= char && char <= "f") && (addr_cnt == 5 || addr_cnt == 6)) ||
((char == "0" || char == "4" || char == "8" || char == "c") && addr_cnt == 7))) begin
error_type = error_type | 4'b0100;
end
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;
`RESET;
end
`FINISH:
if (char == "^") begin
state <= `DURING_TIME;
`RESET;
end
else begin
state <= `AFTER_OTHER;
`RESET;
end
default: begin
state <= `AFTER_OTHER;
`RESET;
end
endcase
end
assign format_type = (state == `FINISH) ? type : 0;
assign error_code = error;
endmodule