enchanter
Member level 2
I am writting 8 bits counter value (16 values) to a binary file and read it back to 128 bits variable.
Input Data: 0x00, 0x01 ..... 0x0f
Output Data (Expected): 0x00010203....0f (128 bits)
My Code is here
Output Result:
I found two problems in the result:
1. Data written into file is not 16 (8 bits) data. It looks like each 8 bits data are extended to 32 bits.
2. When use while(!$feof(fd)) as loop, it print the last data twice.
Can anyone help me point what I did wrong in my simple code or any solutions to solve these two problems?
Thanks.
Input Data: 0x00, 0x01 ..... 0x0f
Output Data (Expected): 0x00010203....0f (128 bits)
My Code is here
Code:
module read_mem;
integer fin;
integer fout;
reg [7:0] data8;
reg [127:0] data128;
integer idx;
integer code;
initial begin
fout = $fopen("test.bin", "w+");
idx = 0;
data8 = 0;
data128 = 0;
while (idx < 16) begin
$display("Data8 = %h", data8);
$fwrite(fout, "%z", data8);
data8 = data8 + 1'b1;
idx = idx + 1;
end
$fclose(fout);
fin = $fopen("test.bin", "r+");
while (!$feof(fin)) begin
code = $fscanf(fin, "%z", data128);
$display("Data128 = %h", data128);
end
$fclose(fin);
end // initial begin
endmodule // read_memOutput Result:
Code:
# Data8 = 00
# Data8 = 01
# Data8 = 02
# Data8 = 03
# Data8 = 04
# Data8 = 05
# Data8 = 06
# Data8 = 07
# Data8 = 08
# Data8 = 09
# Data8 = 0a
# Data8 = 0b
# Data8 = 0c
# Data8 = 0d
# Data8 = 0e
# Data8 = 0f
# Data128 = 00000000000000010000000200000003
# Data128 = 00000004000000050000000600000007
# Data128 = 00000008000000090000000a0000000b
# Data128 = 0000000c0000000d0000000e0000000f
# Data128 = 0000000c0000000d0000000e0000000fI found two problems in the result:
1. Data written into file is not 16 (8 bits) data. It looks like each 8 bits data are extended to 32 bits.
2. When use while(!$feof(fd)) as loop, it print the last data twice.
Can anyone help me point what I did wrong in my simple code or any solutions to solve these two problems?
Thanks.