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mfp_srec_parser.v
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mfp_srec_parser.v
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module mfp_srec_parser
(
input clock,
input reset_n,
input [ 7:0] char_data,
input char_ready,
output reg in_progress,
output reg format_error,
output reg checksum_error,
output reg [ 7:0] error_location,
output [31:0] write_address,
output [ 7:0] write_byte,
output write_enable
);
localparam [4:0]
WAITING_S = 5'd0,
GET_TYPE = 5'd1,
GET_COUNT_7_4 = 5'd2,
GET_COUNT_3_0 = 5'd3,
GET_ADDRESS_31_28 = 5'd4,
GET_ADDRESS_27_24 = 5'd5,
GET_ADDRESS_23_20 = 5'd6,
GET_ADDRESS_19_16 = 5'd7,
GET_ADDRESS_15_12 = 5'd8,
GET_ADDRESS_11_08 = 5'd9,
GET_ADDRESS_07_04 = 5'd10,
GET_ADDRESS_03_00 = 5'd11,
GET_BYTE_7_4 = 5'd12,
GET_BYTE_3_0 = 5'd13,
CHECK_SUM_7_4 = 5'd14,
CHECK_SUM_3_0 = 5'd15,
CR = 5'd16,
LF = 5'd17
;
localparam [7:0]
CHAR_LF = 8'h0A,
CHAR_CR = 8'h0D,
CHAR_0 = 8'h30,
CHAR_3 = 8'h33,
CHAR_7 = 8'h37,
CHAR_9 = 8'h39,
CHAR_A = 8'h41,
CHAR_F = 8'h46,
CHAR_S = 8'h53
;
reg [3:0] nibble;
reg nibble_error;
always @*
begin
nibble = 0;
nibble_error = 0;
if (char_data >= CHAR_0 && char_data <= CHAR_9)
nibble = char_data - CHAR_0;
else if (char_data >= CHAR_A && char_data <= CHAR_F)
nibble = char_data - CHAR_A + 10;
else
nibble_error = 1;
end
reg [ 4:0] state , reg_state ;
reg [ 7:0] rec_type , reg_rec_type ;
reg [ 7:0] count , reg_count ;
reg [31:0] address , reg_address ;
reg [ 7:0] byte_data , reg_byte_data ;
reg write , reg_write ;
assign write_address = reg_address;
assign write_byte = reg_byte_data;
assign write_enable = reg_write;
always @*
begin
state = reg_state ;
rec_type = reg_rec_type ;
count = reg_count ;
address = reg_address ;
byte_data = reg_byte_data ;
write = 0 ;
if (char_ready)
begin
state = reg_state + 1;
case (reg_state)
WAITING_S:
;
GET_TYPE:
rec_type = char_data;
GET_COUNT_7_4, GET_COUNT_3_0:
count = (count << 4) | nibble;
GET_ADDRESS_31_28 , GET_ADDRESS_27_24,
GET_ADDRESS_23_20 , GET_ADDRESS_19_16,
GET_ADDRESS_15_12 , GET_ADDRESS_11_08,
GET_ADDRESS_07_04 :
address = (address << 4) | nibble;
GET_ADDRESS_03_00:
begin
address = ((address << 4) | nibble) - 1;
if (count == 5)
state = CHECK_SUM_7_4;
end
GET_BYTE_7_4:
byte_data [7:4] = nibble;
GET_BYTE_3_0:
begin
address = address + 1;
byte_data [3:0] = nibble;
if (rec_type == CHAR_3)
write = 1;
count = count - 8'd1;
if (count > 5)
state = GET_BYTE_7_4;
end
CHECK_SUM_7_4, CHECK_SUM_3_0:
byte_data = (byte_data << 4) | nibble;
CR:
if (char_data == CHAR_LF)
state = WAITING_S;
LF:
state = WAITING_S;
endcase
end
end
always @(posedge clock)
begin
reg_count <= count;
reg_address <= address;
reg_byte_data <= byte_data;
end
always @(posedge clock or negedge reset_n)
begin
if (! reset_n)
begin
reg_state <= WAITING_S;
reg_rec_type <= 0;
reg_write <= 0;
end
else
begin
reg_state <= state;
reg_rec_type <= rec_type;
reg_write <= write;
end
end
always @(posedge clock or negedge reset_n)
begin
if (! reset_n)
in_progress <= 0;
else if (rec_type == CHAR_3)
in_progress <= 1;
else if (rec_type == CHAR_7)
in_progress <= 0;
end
always @(posedge clock or negedge reset_n)
begin
if (! reset_n)
begin
format_error <= 0;
end
else if (char_ready && ! format_error)
begin
case (reg_state)
WAITING_S: if ( char_data != CHAR_S ) format_error <= 1;
CR: if ( char_data != CHAR_CR
&& char_data != CHAR_LF )
format_error <= 1;
LF: if ( char_data != CHAR_LF ) format_error <= 1;
default: if ( nibble_error ) format_error <= 1;
endcase
end
end
reg [7:0] checksum;
always @(posedge clock or negedge reset_n)
begin
if (! reset_n)
begin
checksum_error <= 0;
end
else if (char_ready && ! checksum_error)
begin
case (reg_state)
WAITING_S:
checksum <= 0;
GET_COUNT_7_4 ,
GET_ADDRESS_31_28 ,
GET_ADDRESS_23_20 ,
GET_ADDRESS_15_12 ,
GET_ADDRESS_07_04 ,
GET_BYTE_7_4 :
checksum <= checksum + { nibble, 4'b0 };
GET_COUNT_3_0 ,
GET_ADDRESS_27_24 ,
GET_ADDRESS_19_16 ,
GET_ADDRESS_11_08 ,
GET_ADDRESS_03_00 ,
GET_BYTE_3_0 :
checksum <= checksum + nibble;
CHECK_SUM_3_0:
if ((~ checksum) != byte_data)
checksum_error <= 1;
endcase
end
end
wire error = format_error | checksum_error;
always @(posedge clock or negedge reset_n)
begin
if (! reset_n)
error_location <= 0;
else if (char_ready && ! error)
error_location <= error_location + 1;
end
endmodule