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//
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/////////////////////////////////////////////////////////////////////////////

//
// 24 bit CRC of 64 data bits (reversed - MSB first)
// polynomial : 00328b63 
//    x^21 + x^20 + x^17 + x^15 + x^11 + x^9 + x^8 + x^6 + x^5 + x^1 + x^0
//
//        CCCCCCCCCCCCCCCCCCCCCCCC DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD 
//        000000000011111111112222 0000000000111111111122222222223333333333444444444455555555556666 
//        012345678901234567890123 0123456789012345678901234567890123456789012345678901234567890123 
// C00  = .#....#.##..##..#.###.## ................................................................ 
// C01  = ###...###.#.#.#.###..##. ................................................................ 
// C02  = .###...###.#.#.#.###..## ................................................................ 
// C03  = ..###...###.#.#.#.###..# ................................................................ 
// C04  = ...###...###.#.#.#.###.. ................................................................ 
// C05  = ##..##..####.##....#.#.# ................................................................ 
// C06  = ..#..#..#.##.####.##...# ................................................................ 
// C07  = #..#..#..#.##.####.##... ................................................................ 
// C08  = #...#.#####....#.#.#.### ................................................................ 
// C09  = #....###..####.....#.... ................................................................ 
// C10  = ##....###..####.....#... ................................................................ 
// C11  = #.#...##......###.###### ................................................................ 
// C12  = ##.#...##......###.##### ................................................................ 
// C13  = ###.#...##......###.#### ................................................................ 
// C14  = .###.#...##......###.### ................................................................ 
// C15  = .####...######..#....... ................................................................ 
// C16  = ..####...######..#...... ................................................................ 
// C17  = .#.###..####..###..##.## ................................................................ 
// C18  = #.#.###..####..###..##.# ................................................................ 
// C19  = ##.#.###..####..###..##. ................................................................ 
// C20  = #.#.#..#.#.#..#.##..#... ................................................................ 
// C21  = ...#.##..##..#.###.##### ................................................................ 
// C22  = ....#.##..##..#.###.#### ................................................................ 
// C23  = #....#.##..##..#.###.### ................................................................ 
//
// Number of XORs used is 24
// Maximum XOR input count is 15
//   Best possible depth in 4 LUTs = 2
//   Best possible depth in 5 LUTs = 2
//   Best possible depth in 6 LUTs = 2
// Total XOR inputs 302
//
// Special signal relations -
//    none
//

module crc24_zer64_flat (c,crc_out);
input[23:0] c;
output[23:0] crc_out;
wire[23:0] crc_out;

assign crc_out[0] =
    c[1] ^ c[6] ^ c[8] ^ c[9] ^ c[12] ^ c[13] ^ 
    c[16] ^ c[18] ^ c[19] ^ c[20] ^ c[22] ^ c[23];

assign crc_out[1] =
    c[0] ^ c[1] ^ c[2] ^ c[6] ^ c[7] ^ c[8] ^ 
    c[10] ^ c[12] ^ c[14] ^ c[16] ^ c[17] ^ c[18] ^ c[21] ^ 
    c[22];

assign crc_out[2] =
    c[1] ^ c[2] ^ c[3] ^ c[7] ^ c[8] ^ c[9] ^ 
    c[11] ^ c[13] ^ c[15] ^ c[17] ^ c[18] ^ c[19] ^ c[22] ^ 
    c[23];

assign crc_out[3] =
    c[2] ^ c[3] ^ c[4] ^ c[8] ^ c[9] ^ c[10] ^ 
    c[12] ^ c[14] ^ c[16] ^ c[18] ^ c[19] ^ c[20] ^ c[23];

assign crc_out[4] =
    c[3] ^ c[4] ^ c[5] ^ c[9] ^ c[10] ^ c[11] ^ 
    c[13] ^ c[15] ^ c[17] ^ c[19] ^ c[20] ^ c[21];

assign crc_out[5] =
    c[0] ^ c[1] ^ c[4] ^ c[5] ^ c[8] ^ c[9] ^ 
    c[10] ^ c[11] ^ c[13] ^ c[14] ^ c[19] ^ c[21] ^ c[23];

assign crc_out[6] =
    c[2] ^ c[5] ^ c[8] ^ c[10] ^ c[11] ^ c[13] ^ 
    c[14] ^ c[15] ^ c[16] ^ c[18] ^ c[19] ^ c[23];

assign crc_out[7] =
    c[0] ^ c[3] ^ c[6] ^ c[9] ^ c[11] ^ c[12] ^ 
    c[14] ^ c[15] ^ c[16] ^ c[17] ^ c[19] ^ c[20];

assign crc_out[8] =
    c[0] ^ c[4] ^ c[6] ^ c[7] ^ c[8] ^ c[9] ^ 
    c[10] ^ c[15] ^ c[17] ^ c[19] ^ c[21] ^ c[22] ^ c[23];

assign crc_out[9] =
    c[0] ^ c[5] ^ c[6] ^ c[7] ^ c[10] ^ c[11] ^ 
    c[12] ^ c[13] ^ c[19];

assign crc_out[10] =
    c[0] ^ c[1] ^ c[6] ^ c[7] ^ c[8] ^ c[11] ^ 
    c[12] ^ c[13] ^ c[14] ^ c[20];

assign crc_out[11] =
    c[0] ^ c[2] ^ c[6] ^ c[7] ^ c[14] ^ c[15] ^ 
    c[16] ^ c[18] ^ c[19] ^ c[20] ^ c[21] ^ c[22] ^ c[23];

assign crc_out[12] =
    c[0] ^ c[1] ^ c[3] ^ c[7] ^ c[8] ^ c[15] ^ 
    c[16] ^ c[17] ^ c[19] ^ c[20] ^ c[21] ^ c[22] ^ c[23];

assign crc_out[13] =
    c[0] ^ c[1] ^ c[2] ^ c[4] ^ c[8] ^ c[9] ^ 
    c[16] ^ c[17] ^ c[18] ^ c[20] ^ c[21] ^ c[22] ^ c[23];

assign crc_out[14] =
    c[1] ^ c[2] ^ c[3] ^ c[5] ^ c[9] ^ c[10] ^ 
    c[17] ^ c[18] ^ c[19] ^ c[21] ^ c[22] ^ c[23];

assign crc_out[15] =
    c[1] ^ c[2] ^ c[3] ^ c[4] ^ c[8] ^ c[9] ^ 
    c[10] ^ c[11] ^ c[12] ^ c[13] ^ c[16];

assign crc_out[16] =
    c[2] ^ c[3] ^ c[4] ^ c[5] ^ c[9] ^ c[10] ^ 
    c[11] ^ c[12] ^ c[13] ^ c[14] ^ c[17];

assign crc_out[17] =
    c[1] ^ c[3] ^ c[4] ^ c[5] ^ c[8] ^ c[9] ^ 
    c[10] ^ c[11] ^ c[14] ^ c[15] ^ c[16] ^ c[19] ^ c[20] ^ 
    c[22] ^ c[23];

assign crc_out[18] =
    c[0] ^ c[2] ^ c[4] ^ c[5] ^ c[6] ^ c[9] ^ 
    c[10] ^ c[11] ^ c[12] ^ c[15] ^ c[16] ^ c[17] ^ c[20] ^ 
    c[21] ^ c[23];

assign crc_out[19] =
    c[0] ^ c[1] ^ c[3] ^ c[5] ^ c[6] ^ c[7] ^ 
    c[10] ^ c[11] ^ c[12] ^ c[13] ^ c[16] ^ c[17] ^ c[18] ^ 
    c[21] ^ c[22];

assign crc_out[20] =
    c[0] ^ c[2] ^ c[4] ^ c[7] ^ c[9] ^ c[11] ^ 
    c[14] ^ c[16] ^ c[17] ^ c[20];

assign crc_out[21] =
    c[3] ^ c[5] ^ c[6] ^ c[9] ^ c[10] ^ c[13] ^ 
    c[15] ^ c[16] ^ c[17] ^ c[19] ^ c[20] ^ c[21] ^ c[22] ^ 
    c[23];

assign crc_out[22] =
    c[4] ^ c[6] ^ c[7] ^ c[10] ^ c[11] ^ c[14] ^ 
    c[16] ^ c[17] ^ c[18] ^ c[20] ^ c[21] ^ c[22] ^ c[23];

assign crc_out[23] =
    c[0] ^ c[5] ^ c[7] ^ c[8] ^ c[11] ^ c[12] ^ 
    c[15] ^ c[17] ^ c[18] ^ c[19] ^ c[21] ^ c[22] ^ c[23];

endmodule