crc checker

I have this good rx frame below. I am using easics crc generator tool
to get 32 bit crc, with 32 bit data.
I am unable to produce the crc that has been received in the packet
which is
e5 5c 0b f8 (from the packet below)
I am must be missing something.
Below is the function generated by easics tool. I have a good frame
below with good crc.
When I call the function, the first byte I send is in the order
first bytes sent is bit reversed in each byte


// crc_packet[*] are the bit reverse of the data in the packet

next_crc <= nextCRC32_D32({crc_packet[3], crc_packet[2],
crc_packet[1], crc_packet[0]}, next_crc);

second byte
next_crc <= nextCRC32_D32({crc_packet[7], crc_packet[6],
crc_packet[5], crc_packet[4]}, next_crc);
..
..
..
~

At the last stage
next_crc <= nextCRC32_D32({crc_packet[56], crc_packet[57],
crc_packet[58], crc_packet[59]}, next_crc);

The out of the crc will be

assign crc_out = bit reverse and complement of "next_crc from the last
stage "

Is this correct way ?


function [31:0] nextCRC32_D32;

input [31:0] data_in;
input [31:0] crc_in;

reg [31:0] D;
reg [31:0] C;
reg [31:0] NewCRC;

begin

D = data_in;
C = crc_in;

NewCRC[0] = D[31] ^ D[30] ^ D[29] ^ D[28] ^ D[26] ^ D[25] ^ D[24] ^
D[16] ^ D[12] ^ D[10] ^ D[9] ^ D[6] ^ D[0] ^ C[0] ^
C[6] ^ C[9] ^ C[10] ^ C[12] ^ C[16] ^ C[24] ^ C[25] ^
C[26] ^ C[28] ^ C[29] ^ C[30] ^ C[31];
NewCRC[1] = D[28] ^ D[27] ^ D[24] ^ D[17] ^ D[16] ^ D[13] ^ D[12] ^
D[11] ^ D[9] ^ D[7] ^ D[6] ^ D[1] ^ D[0] ^ C[0] ^ C[1]
^
C[6] ^ C[7] ^ C[9] ^ C[11] ^ C[12] ^ C[13] ^ C[16] ^
C[17] ^ C[24] ^ C[27] ^ C[28];
NewCRC[2] = D[31] ^ D[30] ^ D[26] ^ D[24] ^ D[18] ^ D[17] ^ D[16] ^
D[14] ^ D[13] ^ D[9] ^ D[8] ^ D[7] ^ D[6] ^ D[2] ^
D[1] ^ D[0] ^ C[0] ^ C[1] ^ C[2] ^ C[6] ^ C[7] ^ C[8] ^
C[9] ^ C[13] ^ C[14] ^ C[16] ^ C[17] ^ C[18] ^ C[24] ^
C[26] ^ C[30] ^ C[31];
NewCRC[3] = D[31] ^ D[27] ^ D[25] ^ D[19] ^ D[18] ^ D[17] ^ D[15] ^
D[14] ^ D[10] ^ D[9] ^ D[8] ^ D[7] ^ D[3] ^ D[2] ^
D[1] ^ C[1] ^ C[2] ^ C[3] ^ C[7] ^ C[8] ^ C[9] ^ C[10]
^
C[14] ^ C[15] ^ C[17] ^ C[18] ^ C[19] ^ C[25] ^ C[27] ^
C[31];
NewCRC[4] = D[31] ^ D[30] ^ D[29] ^ D[25] ^ D[24] ^ D[20] ^ D[19] ^
D[18] ^ D[15] ^ D[12] ^ D[11] ^ D[8] ^ D[6] ^ D[4] ^
D[3] ^ D[2] ^ D[0] ^ C[0] ^ C[2] ^ C[3] ^ C[4] ^ C[6] ^
C[8] ^ C[11] ^ C[12] ^ C[15] ^ C[18] ^ C[19] ^ C[20] ^
C[24] ^ C[25] ^ C[29] ^ C[30] ^ C[31];
NewCRC[5] = D[29] ^ D[28] ^ D[24] ^ D[21] ^ D[20] ^ D[19] ^ D[13] ^
D[10] ^ D[7] ^ D[6] ^ D[5] ^ D[4] ^ D[3] ^ D[1] ^ D[0]
^
C[0] ^ C[1] ^ C[3] ^ C[4] ^ C[5] ^ C[6] ^ C[7] ^ C[10]
^
C[13] ^ C[19] ^ C[20] ^ C[21] ^ C[24] ^ C[28] ^ C[29];
NewCRC[6] = D[30] ^ D[29] ^ D[25] ^ D[22] ^ D[21] ^ D[20] ^ D[14] ^
D[11] ^ D[8] ^ D[7] ^ D[6] ^ D[5] ^ D[4] ^ D[2] ^ D[1]
^
C[1] ^ C[2] ^ C[4] ^ C[5] ^ C[6] ^ C[7] ^ C[8] ^ C[11]
^
C[14] ^ C[20] ^ C[21] ^ C[22] ^ C[25] ^ C[29] ^ C[30];
NewCRC[7] = D[29] ^ D[28] ^ D[25] ^ D[24] ^ D[23] ^ D[22] ^ D[21] ^
D[16] ^ D[15] ^ D[10] ^ D[8] ^ D[7] ^ D[5] ^ D[3] ^
D[2] ^ D[0] ^ C[0] ^ C[2] ^ C[3] ^ C[5] ^ C[7] ^ C[8] ^
C[10] ^ C[15] ^ C[16] ^ C[21] ^ C[22] ^ C[23] ^ C[24] ^
C[25] ^ C[28] ^ C[29];

NewCRC[8] = D[31] ^ D[28] ^ D[23] ^ D[22] ^ D[17] ^ D[12] ^ D[11] ^
D[10] ^ D[8] ^ D[4] ^ D[3] ^ D[1] ^ D[0] ^ C[0] ^ C[1]
^
C[3] ^ C[4] ^ C[8] ^ C[10] ^ C[11] ^ C[12] ^ C[17] ^
C[22] ^ C[23] ^ C[28] ^ C[31];
NewCRC[9] = D[29] ^ D[24] ^ D[23] ^ D[18] ^ D[13] ^ D[12] ^ D[11] ^
D[9] ^ D[5] ^ D[4] ^ D[2] ^ D[1] ^ C[1] ^ C[2] ^ C[4] ^
C[5] ^ C[9] ^ C[11] ^ C[12] ^ C[13] ^ C[18] ^ C[23] ^
C[24] ^ C[29];
NewCRC[10] = D[31] ^ D[29] ^ D[28] ^ D[26] ^ D[19] ^ D[16] ^ D[14]
^
D[13] ^ D[9] ^ D[5] ^ D[3] ^ D[2] ^ D[0] ^ C[0] ^ C[2]
^
C[3] ^ C[5] ^ C[9] ^ C[13] ^ C[14] ^ C[16] ^ C[19] ^
C[26] ^ C[28] ^ C[29] ^ C[31];
NewCRC[11] = D[31] ^ D[28] ^ D[27] ^ D[26] ^ D[25] ^ D[24] ^ D[20]
^
D[17] ^ D[16] ^ D[15] ^ D[14] ^ D[12] ^ D[9] ^ D[4] ^
D[3] ^ D[1] ^ D[0] ^ C[0] ^ C[1] ^ C[3] ^ C[4] ^ C[9]
^
C[12] ^ C[14] ^ C[15] ^ C[16] ^ C[17] ^ C[20] ^ C[24]
^
C[25] ^ C[26] ^ C[27] ^ C[28] ^ C[31];
NewCRC[12] = D[31] ^ D[30] ^ D[27] ^ D[24] ^ D[21] ^ D[18] ^ D[17]
^
D[15] ^ D[13] ^ D[12] ^ D[9] ^ D[6] ^ D[5] ^ D[4] ^
D[2] ^ D[1] ^ D[0] ^ C[0] ^ C[1] ^ C[2] ^ C[4] ^ C[5]
^
C[6] ^ C[9] ^ C[12] ^ C[13] ^ C[15] ^ C[17] ^ C[18] ^
C[21] ^ C[24] ^ C[27] ^ C[30] ^ C[31];
NewCRC[13] = D[31] ^ D[28] ^ D[25] ^ D[22] ^ D[19] ^ D[18] ^ D[16]
^
D[14] ^ D[13] ^ D[10] ^ D[7] ^ D[6] ^ D[5] ^ D[3] ^
D[2] ^ D[1] ^ C[1] ^ C[2] ^ C[3] ^ C[5] ^ C[6] ^ C[7]
^
C[10] ^ C[13] ^ C[14] ^ C[16] ^ C[18] ^ C[19] ^ C[22]
^
C[25] ^ C[28] ^ C[31];
NewCRC[14] = D[29] ^ D[26] ^ D[23] ^ D[20] ^ D[19] ^ D[17] ^ D[15]
^
D[14] ^ D[11] ^ D[8] ^ D[7] ^ D[6] ^ D[4] ^ D[3] ^
D[2] ^ C[2] ^ C[3] ^ C[4] ^ C[6] ^ C[7] ^ C[8] ^ C[11]
^
C[14] ^ C[15] ^ C[17] ^ C[19] ^ C[20] ^ C[23] ^ C[26]
^
C[29];
NewCRC[15] = D[30] ^ D[27] ^ D[24] ^ D[21] ^ D[20] ^ D[18] ^ D[16]
^
D[15] ^ D[12] ^ D[9] ^ D[8] ^ D[7] ^ D[5] ^ D[4] ^
D[3] ^ C[3] ^ C[4] ^ C[5] ^ C[7] ^ C[8] ^ C[9] ^ C[12]
^
C[15] ^ C[16] ^ C[18] ^ C[20] ^ C[21] ^ C[24] ^ C[27]
^
C[30];
NewCRC[16] = D[30] ^ D[29] ^ D[26] ^ D[24] ^ D[22] ^ D[21] ^ D[19]
^
D[17] ^ D[13] ^ D[12] ^ D[8] ^ D[5] ^ D[4] ^ D[0] ^
C[0] ^ C[4] ^ C[5] ^ C[8] ^ C[12] ^ C[13] ^ C[17] ^
C[19] ^ C[21] ^ C[22] ^ C[24] ^ C[26] ^ C[29] ^ C[30];
NewCRC[17] = D[31] ^ D[30] ^ D[27] ^ D[25] ^ D[23] ^ D[22] ^ D[20]
^
D[18] ^ D[14] ^ D[13] ^ D[9] ^ D[6] ^ D[5] ^ D[1] ^
C[1] ^ C[5] ^ C[6] ^ C[9] ^ C[13] ^ C[14] ^ C[18] ^
C[20] ^ C[22] ^ C[23] ^ C[25] ^ C[27] ^ C[30] ^ C[31];
NewCRC[18] = D[31] ^ D[28] ^ D[26] ^ D[24] ^ D[23] ^ D[21] ^ D[19] ^
D[15] ^ D[14] ^ D[10] ^ D[7] ^ D[6] ^ D[2] ^ C[2] ^
C[6] ^ C[7] ^ C[10] ^ C[14] ^ C[15] ^ C[19] ^ C[21] ^
C[23] ^ C[24] ^ C[26] ^ C[28] ^ C[31];
NewCRC[19] = D[29] ^ D[27] ^ D[25] ^ D[24] ^ D[22] ^ D[20] ^ D[16]
^
D[15] ^ D[11] ^ D[8] ^ D[7] ^ D[3] ^ C[3] ^ C[7] ^
C[8] ^ C[11] ^ C[15] ^ C[16] ^ C[20] ^ C[22] ^ C[24] ^
C[25] ^ C[27] ^ C[29];
NewCRC[20] = D[30] ^ D[28] ^ D[26] ^ D[25] ^ D[23] ^ D[21] ^ D[17]
^
D[16] ^ D[12] ^ D[9] ^ D[8] ^ D[4] ^ C[4] ^ C[8] ^
C[9] ^ C[12] ^ C[16] ^ C[17] ^ C[21] ^ C[23] ^ C[25] ^
C[26] ^ C[28] ^ C[30];
NewCRC[21] = D[31] ^ D[29] ^ D[27] ^ D[26] ^ D[24] ^ D[22] ^ D[18]
^
D[17] ^ D[13] ^ D[10] ^ D[9] ^ D[5] ^ C[5] ^ C[9] ^
C[10] ^ C[13] ^ C[17] ^ C[18] ^ C[22] ^ C[24] ^ C[26]
^
C[27] ^ C[29] ^ C[31];
NewCRC[22] = D[31] ^ D[29] ^ D[27] ^ D[26] ^ D[24] ^ D[23] ^ D[19]
^
D[18] ^ D[16] ^ D[14] ^ D[12] ^ D[11] ^ D[9] ^ D[0] ^
C[0] ^ C[9] ^ C[11] ^ C[12] ^ C[14] ^ C[16] ^ C[18] ^
C[19] ^ C[23] ^ C[24] ^ C[26] ^ C[27] ^ C[29] ^ C[31];
NewCRC[23] = D[31] ^ D[29] ^ D[27] ^ D[26] ^ D[20] ^ D[19] ^ D[17]
^
D[16] ^ D[15] ^ D[13] ^ D[9] ^ D[6] ^ D[1] ^ D[0] ^
C[0] ^ C[1] ^ C[6] ^ C[9] ^ C[13] ^ C[15] ^ C[16] ^
C[17] ^ C[19] ^ C[20] ^ C[26] ^ C[27] ^ C[29] ^ C[31];
NewCRC[24] = D[30] ^ D[28] ^ D[27] ^ D[21] ^ D[20] ^ D[18] ^ D[17]
^
D[16] ^ D[14] ^ D[10] ^ D[7] ^ D[2] ^ D[1] ^ C[1] ^
C[2] ^ C[7] ^ C[10] ^ C[14] ^ C[16] ^ C[17] ^ C[18] ^
C[20] ^ C[21] ^ C[27] ^ C[28] ^ C[30];
NewCRC[25] = D[31] ^ D[29] ^ D[28] ^ D[22] ^ D[21] ^ D[19] ^ D[18]
^
D[17] ^ D[15] ^ D[11] ^ D[8] ^ D[3] ^ D[2] ^ C[2] ^
C[3] ^ C[8] ^ C[11] ^ C[15] ^ C[17] ^ C[18] ^ C[19] ^
C[21] ^ C[22] ^ C[28] ^ C[29] ^ C[31];
NewCRC[26] = D[31] ^ D[28] ^ D[26] ^ D[25] ^ D[24] ^ D[23] ^ D[22]
^
D[20] ^ D[19] ^ D[18] ^ D[10] ^ D[6] ^ D[4] ^ D[3] ^
D[0] ^ C[0] ^ C[3] ^ C[4] ^ C[6] ^ C[10] ^ C[18] ^
C[19] ^ C[20] ^ C[22] ^ C[23] ^ C[24] ^ C[25] ^ C[26]
^
C[28] ^ C[31];
NewCRC[27] = D[29] ^ D[27] ^ D[26] ^ D[25] ^ D[24] ^ D[23] ^ D[21]
^
D[20] ^ D[19] ^ D[11] ^ D[7] ^ D[5] ^ D[4] ^ D[1] ^
C[1] ^ C[4] ^ C[5] ^ C[7] ^ C[11] ^ C[19] ^ C[20] ^
C[21] ^ C[23] ^ C[24] ^ C[25] ^ C[26] ^ C[27] ^ C[29];
NewCRC[28] = D[30] ^ D[28] ^ D[27] ^ D[26] ^ D[25] ^ D[24] ^ D[22]
^
D[21] ^ D[20] ^ D[12] ^ D[8] ^ D[6] ^ D[5] ^ D[2] ^
C[2] ^ C[5] ^ C[6] ^ C[8] ^ C[12] ^ C[20] ^ C[21] ^
NewCRC[29] = D[31] ^ D[29] ^ D[28] ^ D[27] ^ D[26] ^ D[25]
^ D[23] ^
D[22] ^ D[21] ^ D[13] ^ D[9] ^ D[7] ^ D[6] ^ D[3] ^
C[3] ^ C[6] ^ C[7] ^ C[9] ^ C[13] ^ C[21] ^ C[22] ^
C[23] ^ C[25] ^ C[26] ^ C[27] ^ C[28] ^ C[29] ^ C[31];
NewCRC[30] = D[30] ^ D[29] ^ D[28] ^ D[27] ^ D[26] ^ D[24] ^ D[23]
^
D[22] ^ D[14] ^ D[10] ^ D[8] ^ D[7] ^ D[4] ^ C[4] ^
C[7] ^ C[8] ^ C[10] ^ C[14] ^ C[22] ^ C[23] ^ C[24] ^
C[26] ^ C[27] ^ C[28] ^ C[29] ^ C[30];
NewCRC[31] = D[31] ^ D[30] ^ D[29] ^ D[28] ^ D[27] ^ D[25] ^ D[24]
^
D[23] ^ D[15] ^ D[11] ^ D[9] ^ D[8] ^ D[5] ^ C[5] ^
C[8] ^ C[9] ^ C[11] ^ C[15] ^ C[23] ^ C[24] ^ C[25] ^
C[27] ^ C[28] ^ C[29] ^ C[30] ^ C[31];

nextCRC32_D32 = NewCRC;

end

endfunction

DATA _PACKET

55
55
55
55
55
55
55
d5
0d -- DA starts here crc_packet[0] = 8'hB0 (after bit
reversing 0d)
0d crc_packet[1]
0d
0d
0d
0d
0c
0c
0c
0c
0c
0c
88
08
00
01
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77
77 -- crc_packet[59] = 8'h0E after bit
reversed (last crc_packet)
e5 -- CRC bytes start here
5c
0b
f8 -- CRC byte end here

.

Relevant Pages

  • Re: crc on only data or including the address
    ... >For that i am implementing ethernet packet generator in the fpga. ... >am sending 64 bytes of frame from the fpga with the most significand ... Actually, what is sent is the FCS, which is bit reversed ... >2) Is CRC implemented on only data or on whole frame? ...
    (comp.arch.fpga)
  • Re: Suggestions for custom application-layer protocol?
    ... CRC is detected, the end of the first frame is known and it can now be ... The slave only needs to be able to ... updated CRC accumulator must be compared with the two most recently ...
    (comp.os.linux.embedded)
  • Re: Suggestions for custom application-layer protocol?
    ... CRC is detected, the end of the first frame is known and it can now be ... The slave only needs to be able to ... updated CRC accumulator must be compared with the two most recently ...
    (comp.unix.programmer)
  • Re: Crc16 on power failure
    ... after the machine is restarted (power on in this case). ... XOR the CRC with the XOR of that word ... Compute the FCS of a frame, and add it at the end of the frame. ...
    (comp.arch.embedded)
  • Re: CRC, which error patterns can be detected?
    ... >> They are different binary numbers and depend upon frame size. ... >> CRC stands for cyclic reduncance check, named for the way it is ... > is a valid message, if and only if e ... Therefore an error pattern is undetected, ...
    (sci.math)